Patent Grant
11896218
The present invention relates to surgical instruments and, in various arrangements, to surgical stapling and cutting instruments, end effectors, and staple cartridges for use therewith that are designed to staple and cut tissue.
Various features of the embodiments described herein, together with advantages thereof, may be understood in accordance with the following description taken in conjunction with the accompanying drawings as follows:
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate various embodiments of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
Applicant of the present application owns the following U.S. patent applications that were filed on Mar. 24, 2021 and which are each herein incorporated by reference in their respective entireties:
Applicant of the present application owns the following U.S. Patent Applications and U.S. Patents that were filed on Dec. 19, 2017 and which are each herein incorporated by reference in their respective entireties:
Applicant of the present application owns the following U.S. Patent Applications and U.S. Patents that were filed on Jun. 28, 2017 and which are each herein incorporated by reference in their respective entireties:
Applicant of the present application owns the following U.S. Patent Applications and U.S. Patents that were filed on Jun. 27, 2017 and which are each herein incorporated by reference in their respective entireties:
Applicant of the present application owns the following U.S. Patent Applications that were filed on Jun. 2, 2020 and which are each herein incorporated by reference in their respective entireties:
Applicant of the present application owns the following U.S. Design Patent Applications and U.S. Patents that were filed on Nov. 14, 2016, and which are each herein incorporated by reference in their respective entireties:
Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. Well-known operations, components, and elements have not been described in detail so as not to obscure the embodiments described in the specification. The reader will understand that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and illustrative. Variations and changes thereto may be made without departing from the scope of the claims.
The terms “comprise” (and any form of comprise, such as “comprises” and “comprising”), “have” (and any form of have, such as “has” and “having”), “include” (and any form of include, such as “includes” and “including”) and “contain” (and any form of contain, such as “contains” and “containing”) are open-ended linking verbs. As a result, a surgical system, device, or apparatus that “comprises,” “has,” “includes” or “contains” one or more elements possesses those one or more elements, but is not limited to possessing only those one or more elements. Likewise, an element of a system, device, or apparatus that “comprises,” “has,” “includes” or “contains” one or more features possesses those one or more features, but is not limited to possessing only those one or more features.
The terms “proximal” and “distal” are used herein with reference to a clinician manipulating the handle portion of the surgical device. The term “proximal” refers to the portion closest to the clinician and the term “distal” refers to the portion located away from the clinician. It will be further appreciated that, for convenience and clarity, spatial terms such as “vertical”, “horizontal”, “up”, and “down” may be used herein with respect to the drawings. However, surgical device are used in many orientations and positions, and these terms are not intended to be limiting and/or absolute. In the following description, terms such as “first,” “second,” “top,” “bottom,” “up,” “down,” and the like are words of convenience and are not to be construed as limiting terms.
References to items in the singular should be understood to include items in the plural, and vice versa, unless explicitly stated otherwise or clear from the text. Grammatical conjunctions are intended to express any and all disjunctive and conjunctive combinations of conjoined clauses, sentences, words, and the like, unless otherwise stated or clear from the context. Thus, the term “or” should generally be understood to mean “and/or”, etc.
Recitation of ranges of values herein are not intended to be limiting, referring instead individually to any and all values falling within the range, unless otherwise indicated herein, and each separate value within such a range is incorporated into the disclosure as if it were individually recited herein. The words “about,” “approximately” or the like, when accompanying a numerical value, are to be construed as indicating a deviation as would be appreciated by one of ordinary skill in the art to operate satisfactorily for an intended purpose. Similarly, words of approximation such as “approximately” or “substantially” when used in reference to physical characteristics, should be construed to contemplate a range of deviations that would be appreciated by one of ordinary skill in the art to operate satisfactorily for a corresponding use, function, purpose or the like.
The use of any and all examples, or exemplary language (“e.g.,” “such as,” or the like) provided herein, is intended merely to better illuminate the embodiments and does not pose a limitation on the scope of the embodiments. No language in the specification should be construed as indicating any unclaimed element as essential to the practice of the embodiments.
Various exemplary devices and methods are provided for performing laparoscopic and minimally invasive surgical procedures. However, the reader will readily appreciate that the various methods and devices disclosed herein can be used in numerous surgical procedures and applications including, for example, in connection with open surgical procedures. As the present Detailed Description proceeds, the reader will further appreciate that the various surgical devices disclosed herein can be inserted into a body in any way, such as through a natural orifice, through an incision or puncture hole formed in tissue, etc. The working portions or end effector portions of the surgical devices can be inserted directly into a patient's body or can be inserted through an access device that has a working channel through which the end effector and elongate shaft of a surgical device can be advanced.
A surgical stapling system can comprise a shaft and an end effector extending from the shaft. The end effector comprises a first jaw and a second jaw. The first jaw comprises a staple cartridge. The staple cartridge is insertable into and removable from the first jaw; however, other embodiments are envisioned in which a staple cartridge is not removable from, or at least readily replaceable from, the first jaw. The second jaw comprises an anvil configured to deform staples ejected from the staple cartridge. The second jaw is pivotable relative to the first jaw about a closure axis; however, other embodiments are envisioned in which the first jaw is pivotable relative to the second jaw. The surgical stapling system further comprises an articulation joint configured to permit the end effector to be rotated, or articulated, relative to the shaft. The end effector is rotatable about an articulation axis extending through the articulation joint. Other embodiments are envisioned which do not include an articulation joint.
The staple cartridge comprises a cartridge body. The cartridge body includes a proximal end, a distal end, and a deck extending between the proximal end and the distal end. In use, the staple cartridge is positioned on a first side of the tissue to be stapled and the anvil is positioned on a second side of the tissue to be stapled. The anvil is moved toward the staple cartridge to compress and clamp the tissue against the deck. Thereafter, staples removably stored in the cartridge body can be deployed into the tissue. The cartridge body includes staple cavities defined therein wherein staples are removably stored in the staple cavities. The staple cavities are arranged in six longitudinal rows. Three rows of staple cavities are positioned on a first side of a longitudinal slot and three rows of staple cavities are positioned on a second side of the longitudinal slot. Other arrangements of staple cavities and staples are contemplated.
The staples are supported by staple drivers in the cartridge body. The drivers are movable between a first, or unfired, position and a second, or fired, position to eject the staples from the staple cavities. The drivers are retained in the cartridge body by a retainer which extends around the bottom of the cartridge body and includes resilient members configured to grip the cartridge body and hold the retainer to the cartridge body. The drivers are movable between their unfired positions and their fired positions by a sled. The sled is movable between a proximal position adjacent a proximal end of the cartridge body and a distal position adjacent a distal end of the cartridge body. The sled comprises a plurality of ramped surfaces configured to slide under the drivers and lift the drivers, and the staples supported thereon, toward the anvil.
Further to the above, the sled is moved distally by a firing member. The firing member is configured to contact the sled and push the sled toward the distal end. The longitudinal slot defined in the cartridge body is configured to receive the firing member. The anvil also includes a slot configured to receive the firing member. The firing member further comprises a first cam which engages the first jaw and a second cam which engages the second jaw. As the firing member is advanced distally, the first cam and the second cam can control the distance, or tissue gap, between the deck of the staple cartridge and the anvil. The firing member also comprises a knife configured to incise the tissue captured intermediate the staple cartridge and the anvil. It is desirable for the knife to be positioned at least partially proximal to the ramped surfaces such that the staples are ejected into the tissue ahead of the knife transecting the tissue.
Discussed in greater detail below, the end effector 200 is articulatable by way of an articulation region 110 of the shaft assembly 100. Such articulation provides a user of the surgical stapling instrument 10 with the ability to position and/or maneuver the end effector 200 near the target tissue more accurately.
The handle 20 comprises a housing 21 configured to house various mechanical and electrical components and a handle portion 22 extending from the housing 21. The handle portion 22 is configured to fit in the palm of a user and/or be gripped and/or held by a user using the surgical stapling instrument 10. The handle 20 further comprises various actuators and/or triggers configured to be actuated by a user to operate one or more functions of the surgical stapling instrument 10. The handle 20 comprises a closure trigger 24, a firing trigger 25, and at least one articulation actuator 26. When actuated by a user, the closure trigger 24 is configured to clamp tissue with the end effector 200 by moving the anvil jaw 203 toward the cartridge jaw 201. When actuated by a user, the firing trigger 25 is configured to cut and staple tissue with the end effector 200 by advancing a firing member to eject staples and cut tissue with a knife. When actuated by a user, the articulation actuator 26 is configured to articulate the end effector 200 relative to the shaft assembly 100 by way of the articulation region 110. The triggers and actuators of the surgical stapling instrument 10 can either trigger one or more motors within the handle 20 to actuate various function of the surgical stapling instrument 10 and/or manually drive various drive shafts and components to actuate various function of the surgical stapling instrument 10.
The handle 20 further comprises a nozzle assembly 30 configured to support the shaft assembly 100 therein. The nozzle assembly 30 comprises an actuation wheel 31 configured to be rotated by a user to rotate the shaft assembly 100 and end effector 200 about a longitudinal axis LA relative to the handle 20. Such a mechanism permits the user of the surgical stapling instrument 10 to rotate only the shaft assembly 100 and/or end effector 200 without having to rotate the entire handle 20.
The handle 20 further comprises a battery 23 configured to provide power to various electronic components, sensors, and/or motors of the surgical stapling instrument 10. Embodiments are envisioned where the surgical stapling instrument 10 is directly connected to a power source. Embodiments are also envisioned where the surgical stapling instrument 10 is entirely manual or, non-powered, for example. Embodiments are further envisioned where articulation of the end effector, clamping and unclamping of the jaws, firing of the end effector staple and cut tissue, and shaft and/or end effector rotation are all powered systems.
In at least one instance, the shaft assembly 100 and the end effector 200 may be modular and removable from the handle 20. In at least one instance, the end effector 200 may be modular in that the end effector 200 can be removed from the shaft assembly 100 and replaced with a different end effector. In at least one instance, the shaft assembly 100 and/or the end effector 200 is employable in a surgical robotic environment. Such an embodiment would provide powered inputs from a surgical robotic interface to actuate each function of the end effector 200. Examples of such surgical robots and surgical tools are further described in U.S. Patent Application Publication No. 2020/0138534, titled ROBOTIC SURGICAL SYSTEM, which published on May 7, 2020, which is incorporated by reference herein in its entirety.
In at least one instance, the shaft assembly 100 and the end effector 200 are configured to be used with a surgical robot. In such an instance, the shaft assembly 100 and the end effector 200 are configured to be coupled to a surgical robot comprising a plurality of output drives. The plurality of output drives of the surgical robot are configured to mate with the drive systems of the shaft assembly 100 and end effector 200. In such an instance, the surgical robot can actuate the various different functions of the end effector 200 such as, for example, articulating the end effector about multiple different articulation joints, rotating the shaft assembly 100 and/or end effector 200 about its longitudinal axis, clamping the end effector 200 to clamp tissue between the jaws of the end effector 200, and/or firing the end effector 200 to cut and/or staple tissue.
The shaft assembly 100 is configured to house various drive system components and/or electronic components of the surgical stapling instrument 10 so that the end effector 200 and shaft assembly 100 may be inserted through a trocar for laparoscopic surgery. The various drive system components are configured to be actuated by the various triggers and actuators of the handle 20. Such components can include drive shafts for articulation, drive shafts for clamping and unclamping the end effector 200, and/or drive shafts for firing the end effector 200. Such drive shafts may be rotated by a drive system in the handle 20 or a surgical robotic interface in the instance where the shaft assembly 100 is connected to the same. In various aspects, a stapling end effector can include two independently rotatable drive members-one for grasping tissue and one for firing staples, for example. The stapling end effector can further include an articulation joint, and the rotary motions can be transmitted through the articulation joint. In various aspects, the stapling end effector can include one or more 3D printed assemblies, which can be incorporated into an articulation, grasping, or firing systems.
Such drive shafts may be actuated by a drive system in the handle 20 or a surgical robotic interface in the instance where the shaft assembly 100 is connected to the same. Such drive shafts may comprise linear actuation, rotary actuation, or a combination thereof. A combination of rotary actuation and linear actuation may employ a series of rack gears and/or drive screws, for example.
In at least one instance, the shaft assembly 100 is also configured to house electrical leads for various sensors and/or motors, for example, positioned within the shaft assembly 100 and/or end effector 200, for example.
The shaft assembly 100 comprises an outer shaft 101 extending from the nozzle assembly 30 to the articulation region 110 comprising dual articulation joints, discussed in greater detail below. The articulation region 110 allows the end effector 200 to be articulated relative to the outer shaft 101 in two distinct planes about two separate axes AA1, AA2.
Referring now primarily to
The proximal joint shaft component 120 comprises a proximal annular portion 121 fixedly fitted within the outer shaft 101. The proximal joint shaft component 120 also includes a hollow passage 122 to allow various drive system components to pass therethrough, and further includes an articulation tab 123 comprising a pin hole 124 configured to receive articulation pin 125. The articulation pin 125 pivotally connects the proximal joint shaft component 120 to a proximal articulation tab 131 of the intermediate joint shaft component 130. To articulate the end effector 200 about axis AA1, the articulation actuator 150 is actuated linearly either in a distal direction or a proximal direction. Such an actuator may comprise a bar or rod made of any suitable material such as metal and/or plastic, for example. The articulation actuator 150 is pivotally mounted to an articulation crosslink 151. The articulation crosslink 151 is pivotally mounted to the intermediate joint shaft component 130 off-axis relative to the articulation pin 125 so that when the articulation actuator 150 is actuated, a torque is applied to the intermediate joint shaft component 130 off-axis relative to the articulation pin 125 by the articulation crosslink 151 to cause the intermediate joint shaft component 130 and, thus, the end effector 200, to pivot about axis AA1 relative to the proximal joint shaft component 120.
The intermediate joint shaft component 130 is pivotally connected to the proximal joint shaft component 120 by way of the articulation pin 125 which defines axis AA1. Specifically, the intermediate joint shaft component 130 comprises a proximal articulation tab 131 that is pivotally connected to the proximal joint shaft component 120 by way of the articulation pin 125. The intermediate joint shaft component 130 further comprises a hollow passage 132 configured to allow various drive system components to pass therethrough and a distal articulation tab 133. The distal articulation tab 133 comprises a pin hole 134 configured to receive another articulation pin 136, which defines axis AA2, and a distally-protruding key 135.
To articulate the end effector 200 about axis AA2, the articulation cable 160 is actuated to apply an articulation torque to a proximal tab 141 of the distal joint shaft component 140 by way of the key 135. The articulation cable 160 is fixed to the key 135 such that, as the cable 160 is rotated, the key 135 is pivoted relative to the intermediate joint shaft component 130. The key 135 is fitted within a key hole 144 of the distal joint shaft component 140. Notably, the key 135 is not fixed to the intermediate joint shaft component 130 and the key 135 can be rotated relative to the intermediate joint shaft component 130. The articulation cable 160 also contacts the proximal tab 141 around the pin hole 142. This provides an additional torque moment from the articulation cable 160 to the distal joint shaft component 140. The articulation pin 136 is received within the pin hole 142 to pivotally couple the intermediate joint shaft component 130 and the distal joint shaft component 140.
In at least one instance, the articulation cable 160 is only able to be pulled in a proximal direction. In such an instance, only one side of the articulation cable 160 would be pulled proximally to articulate the end effector 200 in the desired direction. In at least one instance, the articulation cable 160 is pushed and pulled antagonistically. In other words, the cable 160 can comprise a rigid construction such that one side of the articulation cable 160 is pushed distally while the other side of the articulation cable 160 is pulled proximally. Such an arrangement can allow the articulation forces to be divided between the pushed half of the cable 160 and the pulled half of the cable 160. In at least one instance, the push-pull arrangement allows greater articulation forces to be transmitted to the corresponding articulation joint. Such forces may be necessary in an arrangement with two articulation joints. For example, if the proximal articulation joint is fully articulated, more force may be required of the articulation actuator meant to articulate the distal articulation joint owing to the stretching and/or lengthened distance that the articulation actuator for the distal articulation joint must travel.
The distal joint shaft component 140 further comprises a cutout 143 to allow various drive components to pass therethrough. The retention ring 146 secures a channel 210 of the cartridge jaw 201 to the distal joint shaft component 140 thereby fixing the end effector assembly 200 to a distal end of the articulation region 110.
As discussed above, the anvil jaw 201 is movable relative to the cartridge jaw 203 to clamp and unclamp tissue with the end effector 200. Operation of this function of the end effector 200 will now be described. The cartridge jaw 201 comprises the channel 210 and a staple cartridge 220 configured to be received within a cavity 214 of the channel 210. The channel 210 further comprises an annular groove 211 configured to receive the retention ring 146 and a pair of pivot holes 213 configured to receive a jaw-coupling pin 233. The jaw coupling pin 233 permits the anvil jaw 203 to be pivoted relative to the cartridge jaw 201.
The anvil jaw 203 comprises an anvil body 230 and a pair of pivot holes 231. The pivot holes 231 in the proximal portion of the anvil jaw 203 are configured to receive the jaw-coupling pin 233 thereby pivotally coupling the anvil jaw 203 to the cartridge jaw 201. To open and close the anvil jaw 203 relative to the cartridge jaw 201, a closure drive 250 is provided.
The closure drive 250 is actuated by a flexible drive segment 175 comprised of universally-movable joints arranged or formed end-to-end. In various instances, the flexible drive segment 175 can includes serial 3D-printed universal joints, which are printed all together as a single continuous system. Discussed in greater detail below, the flexible drive segment 175 is driven by an input shaft traversing through the shaft assembly 100. The flexible drive segment 175 transmits rotary actuation motions through the dual articulation joints. The closure drive 250 comprises a closure screw 251 and a closure wedge 255 threadably coupled to the closure screw 251. The closure wedge 255 is configured to positively cam the anvil jaw 203 open and closed. The closure screw 251 is supported by a first support body 258 and a second support body 259 secured within the channel 210.
To move the anvil jaw 203 between a clamped position (
To clamp the end effector 200 from an unclamped position (
To open or unclamp the end effector 200 from a clamped position (
In at least one instance, the profile of the cam surface 234 corresponds to the profile of the cam surface 256. For example, the cam surface 234 and the cam surface 256 may match such that a maximum cam force is applied to the anvil body 230 to cause the desired rotation of the anvil body 230. As can be seen in
As discussed above, the surgical stapling instrument 10 may be actuated to advance a firing member through the jaws 201, 203 to staple and cut tissue with the end effector 200. The function of deploying staples 226 from the staple cartridge 220 and cutting tissue with knife 283 will now be described. The staple cartridge 220 comprises a cartridge body 221, a plurality of staple drivers 225, and a plurality of staples 226 removably stored within the cartridge body 221. The cartridge body 221 comprises a deck surface 222, a plurality of staple cavities 223 arranged in longitudinal rows defined in the cartridge body 221, and a longitudinal slot 224 bifurcating the cartridge body 221. The knife 283 is configured to be driven through the longitudinal slot 224 to cut tissue clamped between the anvil body 230 and the deck surface 221.
The deck surface 221 comprises a laterally-contoured tissue-supporting surface. In various aspects, the contour of the deck surface 221 can form a peak along a central portion of the cartridge body 221. Such a peak can overlay a longitudinally-extending firing screw 261 that extends through the central portion of the cartridge body 221, which is further described herein. The increased height along the peak can be associated with a smaller tissue gap along a firing path of the knife 283 in various instances. In certain aspects of the present disclosure, driver heights, formed staple heights, staple pocket extension heights, and/or staple overdrive distances can also vary laterally along the deck surface 221. Laterally-variable staple formation (e.g. a combination of 2D staples and 3D staples) is also contemplated and further described herein.
The staple drivers 225 are configured to be lifted by a sled 280 as the sled 280 is pushed distally through the staple cartridge 220 to eject the staples 226 supported by the staple drivers 225 in the staple cavities 223. The sled 280 comprises ramps 281 to contact the staple drivers 225. The sled 280 also includes the knife 283. The sled 280 is configured to be pushed by a firing member 270.
To deploy the staples 226 and cut tissue with the knife 283, the end effector 200 comprises a firing drive 260. The firing drive 260 is actuated by a flexible drive shaft 176. Discussed in greater detail below, the flexible drive shaft 176 is driven by an input shaft traversing through the shaft assembly 100. The flexible drive shaft 176 transmits rotary actuation motions through the dual articulation joints. The firing drive 260 comprises a firing screw 261 configured to be rotated by the flexible drive shaft 176. The firing screw 261 comprises journals supported within bearings in the support member 259 and the channel 210. In various instances, the firing screw 261 can float relative to the channel 210, as further described herein. The firing screw 261 comprises a proximal end 262 supported within the support member 259 and the channel 210, a distal end 263 supported within the channel 210, and threads 265 extending along a portion of the length of the firing screw 261.
The firing member 270 is threadably coupled to the firing screw 261 such that as the firing screw 261 is rotated, the firing member 270 is advanced distally or retracted proximally along the firing screw 261. Specifically, the firing member 270 comprises a body portion 271 comprising a hollow passage 272 defined therein. The firing screw 261 is configured to be received within the hollow passage 272 and is configured to be threadably coupled with a threaded component 273 of the firing member 270. Thus, as the firing screw 261 is rotated, the threaded component 273 applies a linear force to the body portion 271 to advance the firing member 270 distally or retract the firing member 270 proximally. As the firing member 270 is advanced distally, the firing member 270 pushes the sled 280. Distal movement of the sled 280 causes the ejection of the staples 223 by engaging the plurality of staple drivers 225, as further described herein. The driver 225 is a triple driver, which is configured to simultaneously fire multiple staples 223. The driver 225 can comprise lateral asymmetries, as further described herein, to maximum the width of the sled rails and accommodate the firing screw 261 down the center of the cartridge 220 in various instances.
At a point during firing of the end effector 200, a user may retract the firing member 270 to allow unclamping of the jaws 201, 203. In at least one instance, the full retraction of the firing member 270 is required to open the jaws 201, 203 where upper and lower camming members are provided on the body portion 271 which can only be disengaged from the jaws 201, 203 once the firing member 270 is fully retracted.
In various instances, the firing member 270 can be a hybrid construction of plastic and metal portions as further described herein. In various instances, the threaded component 273 can be a metal component, for example, which is incorporated into the firing member body 271 with insert molding or over molding.
The firing member 270 can also be referred to an I-beam in certain instances. The firing member 270 can include a complex 3D-printed geometry comprising a lattice pattern of spaces therein. In various instances, 3D printing can allow the firing member or a portion thereof to act as a spring and allows a portion to more readily flex, which can improve the force distribution and/or tolerances during a firing stroke, for example.
The shaft assembly 310 comprises the outer shaft 311, a first shaft joint component 330, and a second shaft joint component 350 pivotally coupled to the first shaft joint component 330 by way of an articulation pin 354. The first shaft joint component 330 comprises a proximal tube portion 331 configured to fit within the inner diameter of the outer shaft 311. Such a fit may comprise a press fit, for example. However, any suitable attachment means can be used. The first shaft joint component 330 also includes a distal portion 332. The distal portion 332 comprises an articulation tab 333 comprising a pin hole 334 defined therein and a hollow passage 335 through which various drive components of the surgical stapling assembly 300 can pass. Such drive components can include articulation actuators, closure actuators, and/or firing actuators for example.
The first shaft joint component 330 is pivotally connected to the second shaft joint component 350 by way of the articulation pin 354. The articulation pin 354 is also received within a pin hole 353 of a proximally-extending articulation tab 351 of the second shaft joint component 350. The pin hole 353 is axially aligned with the pin hole 334. The articulation pin 354 allows the second shaft joint component 350 to be articulated relative to the first shaft joint component 330 about the articulation axis AA. The second shaft joint component 350 further comprises a pin protrusion 352 extending from the proximal-extending articulation tab 351. Discussed in greater detail below, the pin protrusion 352 is configured to be pivotally coupled to an articulation drive system. The second shaft joint component 350 further comprises a distal portion 355 comprising an annular groove 356 configured to receive a retention ring 358. The distal portion 355 also includes a hollow passage 357 through which various drive components of the surgical stapling assembly 300 can pass. The retention ring 358 is configured to hold the first jaw 201 to the second shaft joint component 350 by fitting within the annular groove 211 of the cartridge channel 210 and the annular groove 356 of the second shaft joint component 350.
To articulate the end effector 200 about the articulation axis AA, an articulation bar 360 is provided. The articulation bar 360 may be actuated by any suitable means such as, for example, by a robotic or motorized input and/or a manual handle trigger. The articulation bar 360 may be actuated in a proximal direction and a distal direction, for example. Embodiments are envisioned where the articulation system comprises rotary driven actuation in addition to or, in lieu of, linear actuation. The articulation bar 360 extends through the outer shaft 311. The articulation bar 360 comprises a distal end 361 pivotally coupled to an articulation link 362. The articulation link 362 is pivotally coupled to the pin protrusion 352 extending from the proximally-extending articulation tab 351 off center with respect to the articulation axis AA. Such off-center coupling of the articulation link 362 allows the articulation bar 360 to apply a force to the second joint shaft component 350 to rotate the second shaft joint component 350 and, thus, the end effector 200, relative to the first joint shaft component 330. The articulation bar 360 can be advanced distally to rotate the end effector 200 in a first direction about the articulation axis AA and retracted proximally to rotate the end effector 200 in a second direction opposite the first direction about the articulation axis AA.
The shaft assembly 310 further comprises an articulation component support structure 340 positioned within the articulation joint 320. Such a support structure can provide support to various drive components configured to pass through the articulation joint 320 to the end effector 200 as the end effector 200 is articulated. The support structure 340 may also serve to isolate the drive components from tissue remnants during use.
The shaft assembly 410 comprises the outer shaft 411, a first shaft joint component 430, and a second shaft joint component 450 pivotally coupled to the first shaft joint component 430 by way of an articulation pin 454. The first shaft joint component 430 comprises a proximal tube portion 431 configured to fit within the inner diameter of the outer shaft 411. Such a fit may comprise a press fit, for example. However, any suitable attachment means can be used. The first shaft joint component 430 also includes a distal portion 432, which comprises an articulation tab 433 comprising a pin hole 434 defined therein. The distal portion 432 further defines a hollow passage 435 through which various drive components of the surgical stapling assembly 400 can pass. Such drive components can include articulation actuators, closure actuators, and/or firing actuators, for example.
The first shaft joint component 430 is pivotally connected to the second shaft joint component 450 by way of the articulation pin 454. The articulation pin 454 is also received within a pin hole 453 of a proximally-extending articulation tab 451 of the second shaft joint component 450. The articulation pin 454 allows the second shaft joint component 450 to be articulated relative to the first shaft joint component 430 about the articulation axis AA. The second shaft joint component 450 further comprises a drive ring structure 452. The drive ring structure 452 extends from the proximally-extending articulation tab 451 and further defines a portion of the pin hole 453. Discussed in greater detail below, the drive ring structure 452 is configured to be engaged by an articulation drive system. The second shaft joint component 450 further comprises a distal portion 455 comprising an annular groove 456 configured to receive a retention ring 458. A hollow passage 457 through the distal portion 455 is configured to receive various drive components of the surgical stapling assembly 400 therethrough. The retention ring 458 is configured to hold the first jaw 201 to the second shaft joint component 450 by fitting within the annular groove 211 of the cartridge channel 210 and the annular groove 456 of the second shaft joint component 450.
To articulate the end effector 200 about the articulation axis AA, an articulation cable 460 is provided. The articulation cable 460 may be actuated by any suitable means such as, for example, by a robotic input and/or a manual trigger on a handle of a handheld surgical instrument. The articulation cable 460 may comprise an antagonistic actuation profile. In other words, as a first side of the articulation cable 460 is pulled proximally a second side of the articulation cable 460 is allowed to advance distally like a pulley system. Similarly, as the second side is pulled proximally, the first side is allowed to advance distally. The articulation cable 460 extends through the outer shaft 411. The articulation cable 460 is positioned around the drive ring structure 452 and frictionally retained thereon to permit rotation of the second shaft joint component 450 as the articulation cable 460 is actuated. As the articulation cable 460 is actuated, the articulation cable 460 is configured to apply a rotational torque to the drive ring structure 452 of the second joint shaft component 450 and, thus, the end effector 200. Such torque is configured to cause the second joint shaft component 450 to rotate, or pivot, relative to the first joint shaft component 430 thereby articulating the end effector 200 relative to the outer shaft 411. A first side of the articulation cable 460 can pulled to rotate the end effector 200 in a first direction about the articulation axis AA and a second side of the articulation cable 460 can be pulled to rotate the end effector 200 in a second direction opposite the first direction about the articulation axis AA.
The shaft assembly 410 further comprises an articulation component support structure 440 positioned within the articulation joint 420. Such a support structure 440 can provide support to various drive components configured to pass through the articulation joint 420 to the end effector 200 as the end effector 200 is articulated. The support structure 440 may also serve to isolate the drive components from tissue remnants during use.
The surgical stapling assembly 400 further comprises a closure drive shaft segment 475 and a firing drive shaft segment 476 each configured to transmit rotary motion through the articulation joint 420 to the end effector 200. The drive shaft segments 475, 476 are configured to passively expand and contract longitudinally as the end effector 200 is articulated. For example, articulation can cause expansion and contraction of the drive shaft segments 475, 476 to account for the respective longitudinal stretching of or contracting of the length of the drive shafts owing to articulation of the end effector 200 relative to the shaft assembly 410. During expansion and contraction of the drive shaft segments 475, 476, the drive shaft segments 475, 476 maintain rotary driving engagement with corresponding input shafts extending through the outer shaft 411 and output shafts in the end effector 200. In at least one instance, the output shafts comprise the closure screw 251, which is configured to effect grasping, closing, or tissue manipulation with the jaws 201, 203, and the firing screw 261, which is configured to effect clamping of the jaws 201, 203 and firing of the firing member 270.
The shaft assembly 510 comprises a first shaft joint component 530 and a second shaft joint component 540 pivotally coupled to the first shaft joint component 530 by way of an articulation pin 543. The first shaft joint component 530 is configured to be attached to a shaft of a surgical instrument assembly and/or a surgical robotic interface. The first shaft joint component 530 comprises a proximal portion 531 and an articulation tab 533 comprising a pin hole 534 defined therein. In at least one instance, the first shaft joint component 530 comprises a hollow passage through which various drive components of the surgical stapling assembly 400 can pass. Such drive components can include articulation actuators, closure actuators, and/or firing actuators for example.
The first shaft joint component 530 is pivotally connected to the second shaft joint component 540 by way of the articulation pin 543. The articulation pin 543 is also received within a pin hole 542 of a proximally-extending articulation tab 541 of the second shaft joint component 540. The articulation pin 543 allows the second shaft joint component 540 to be articulated relative to the first shaft joint component 530 about the articulation axis AA. The second shaft joint component 540 further comprises a distal portion 545 comprising an annular groove 547 configured to receive a retention ring 548 and a hollow passage 546 through which various drive components of the surgical stapling assembly 500 can pass. The retention ring 548 is configured to hold the first jaw 201 to the second shaft joint component 540 by fitting within the annular groove 211 of the cartridge channel 210 and the annular groove 547 of the second shaft joint component 540.
Any suitable articulation drive system can be used to articulate the end effector 200 about axis AA. In at least one instance, the end effector 200 is passively articulated. In such an instance, the end effector 200 may be pressed against tissue, for example, to apply a force to the end effector 200 and cause the end effector 200 to articulate about an articulation axis. In at least one instance, the end effector 200 further comprises a spring configured to apply a neutral biasing force to the second shaft joint segment 540, for example, to cause the end effector 200 to be biased toward an unarticulated configuration.
The surgical stapling assembly 500 further comprises a closure drive shaft segment 575 and a firing drive shaft segment 576 each configured to transmit rotary motion through the articulation joint 520 to the end effector 200. The drive shaft segments 575, 576 are configured to passively expand and contract longitudinally as the end effector 200 is articulated. Articulation causes the drive shaft segments 575, 576 to expand and contract to account for the longitudinal stretching of or contracting of the length of the drive shafts owing to articulation of the end effector 200. During expansion and contraction of the drive shaft segments 575, 576, the drive shaft segments 575, 576 maintain rotary driving engagement with corresponding input shafts and output shafts in the end effector 200. In at least one instance, the output shafts comprise the closure screw 251 and the firing screw 261, which are further described herein.
The cartridge channel jaw 620 comprises a channel 630 comprising a proximal end 631, a staple cartridge 640 configured to store a plurality of staples therein and configured to be received within the channel 630, and a support brace 650 fitted within the staple cartridge 640. The staple cartridge 640 and the support brace 650 are configured to be assembled together prior to installing the staple cartridge 640 into the channel 630. Discussed in greater detail below, the support brace 650 is configured to further support a firing member assembly as the firing member assembly is advanced through the end effector assembly 600.
The anvil jaw 660 is configured to form staples ejected from the staple cartridge 640. The anvil jaw 660 comprises a proximal end 661 comprising a pair of pin holes 662 defined therein configured to receive a coupling pin 663. The anvil jaw 660 is pivotable about the coupling pin 663 between an unclamped position and a fully clamped position. The coupling pin 663 is also received within a pair of pin holes 633 defined in the proximal end 631 of the channel 630. The coupling pin 663 serves to pivotally mount the anvil jaw 660 to the channel 630. In at least one instance, the channel 630 is mounted to the shaft portion 610 by way of a retention ring, or band, that fits around an annular groove 632 of the channel 630 and annular groove 615 of the shaft portion 610. The retention ring, or band, is configured to hold the channel 630 to the shaft portion 610.
The end effector assembly 600 comprises a closure drive 670 configured to grasp tissue between the anvil jaw 660 and the cartridge channel jaw 620 by pivoting the anvil jaw 660 relative to the channel 630. The end effector assembly 600 also includes a firing drive 680 configured to clamp, staple, and cut tissue by deploying a plurality of staples from the staple cartridge 640. The closure drive 670 comprises a closure screw 671 positioned within the channel 630 and a closure wedge 675 threadably coupled to the closure screw 671. As the closure screw 671 is rotated, the closure wedge 675 is advanced distally or retracted proximally to open or close the anvil jaw 660, respectively. The closure drive 670 may be actuated by any suitable means. For example, a rotary drive shaft may extend through the shaft portion 610 from an actuation interface, for example, to rotate the closure screw 671. Other examples of suitable rotary drive shafts are further described herein.
The firing drive 680 comprises a flexible drive shaft 681 that is configured to be moved linearly through the end effector assembly 600. The flexible drive shaft 681 may be actuated by a robotic input and/or a manually-actuated drive shaft of a handle assembly, for example. The flexible drive shaft 681 is configured to extend through a hollow passage 614 of a distal end 613 of the shaft portion 610 and is flexible so that the end effector assembly 600 may be articulated relative to a shaft from which the end effector 600 extends. The flexible drive shaft 681 extends through a clearance slot 676 defined in the closure wedge 675 and is fixedly attached to a lower firing member 682. The lower firing member 682 is configured to be reused with different staple cartridges.
The staple cartridge 640 comprises a disposable upper firing member 683 configured to hookingly engage or, latch, onto the lower firing member 682 such that the lower firing member 582 can push or, drive, the upper firing member 683 through the staple cartridge 640 and support brace 650. In other words, the firing actuation involves a two-part firing member—a disposable upper firing member 683 incorporated into the cartridge 640 and a reusable lower firing member 682 incorporated into the firing drive 680, which can be coupled together when the cartridge 640 is seated in the elongate channel 630. The two-part firing member is further described herein.
The upper firing member 683 comprises an upper flange configured to engage and position the anvil jaw 660, a knife edge configured to cut tissue, and a latch portion configured to hookingly engage the lower firing member 682. The staple cartridge 640 further comprises a sled 684 configured to engage staple drivers positioned within the staple cartridge 640 to eject staples from the staple cartridge 640. Because a knife and cutting edge are incorporated into the disposable upper firing member 683 of the staple cartridge 640, a new and/or fresh cutting edge can be supplied with each staple cartridge loaded into the end effector assembly 600.
The lower firing member 682 and the upper firing member 683 are configured to move through the support brace 650 such that the vertical loads associated with the firing sequence are configured to be distributed through the support brace 650, the staple cartridge 640, the channel 630, and the anvil jaw 660. The support brace 650 may be comprised of a metal material, for example, to be inserted within the staple cartridge 640. The support brace 650 comprises key rails 655 configured to fit within corresponding key slots defined in a longitudinal slot of the staple cartridge 640. The support brace 650 further comprises a longitudinal slot 653 configured to receive the knife of the upper firing member 683, a cylindrical passage 657 configured to receive a portion of the upper firing member 683, a portion of the lower firing member 682, and the flexible drive shaft 681. The support brace 650 further comprises vertical key extensions 656 configured to be received within corresponding key holes in the cartridge deck. Such extensions may be visible through the cartridge deck when the support brace 650 is installed within the staple cartridge 640. In at least one instance, the support brace 650 is configured to be inserted into the staple cartridge 640 from the bottom of the staple cartridge 640 facing the channel 630.
The support brace 650 further comprises a proximal tab 651 and a distal tab 653, which are both configured to be engaged with the channel 630. The tabs 651, 653 are configured to distribute at least some of the forces transmitted through the assembly 600 by the firing drive 680 and corresponding components. The distal tab 651 may serve to block the upper and lower firing members 683, 682 from being pushed through a distal end of the support brace 650 by sharing and/or redistributing the load applied to the support brace 650 by the firing drive 680 with the channel 630.
When the staple cartridge 640 is replaced so that the end effector assembly 600 can be reused, the staple cartridge 640 is removed from the channel jaw 630. Removing the staple cartridge 640 from the channel jaw 630 removes the upper firing member 683, the sled 684, the support brace 650, and the staple cartridge 640. A fresh knife can be provided with a replacement staple cartridge.
Various embodiments disclosed herein may be employed in connection with a robotic system 700. An exemplary robotic system is depicted in
As can be seen in
In various forms, the robotic arm cart 800 includes a base 702 from which, in the illustrated embodiment, surgical tools 900 may be supported. In various forms, the surgical tool(s) 900 may be supported by a series of manually articulatable linkages, generally referred to as set-up joints 804, and a robotic manipulator 806. In various embodiments, the linkage and joint arrangement may facilitate rotation of a surgical tool around a point in space, as more fully described in U.S. Pat. No. 5,817,084, entitled REMOTE CENTER POSITIONING DEVICE WITH FLEXIBLE DRIVE, the entire disclosure of which is hereby incorporated by reference herein. The parallelogram arrangement constrains rotation to pivoting about an axis 812a, sometimes called the pitch axis. The links supporting the parallelogram linkage are pivotally mounted to set-up joints 804 (
While the data communication between a robotic component and the processor of the robotic surgical system is primarily described herein with reference to communication between the surgical tool and the master controller 701, it should be understood that similar communication may take place between circuitry of a manipulator, a set-up joint, an endoscope or other image capture device, or the like, and the processor of the robotic surgical system for component compatibility verification, component-type identification, component calibration (such as off-set or the like) communication, confirmation of coupling of the component to the robotic surgical system, or the like. In accordance with at least one aspect, various surgical instruments disclosed herein may be used in connection with other robotically-controlled or automated surgical systems and are not necessarily limited to use with the specific robotic system components shown in
It is common practice during various laparoscopic surgical procedures to insert a surgical end effector portion of a surgical instrument through a trocar that has been installed in the abdominal wall of a patient to access a surgical site located inside the patient's abdomen. In its simplest form, a trocar is a pen-shaped instrument with a sharp triangular point at one end that is typically used inside a hollow tube, known as a cannula or sleeve, to create an opening into the body through which surgical end effectors may be introduced. Such arrangement forms an access port into the body cavity through which surgical end effectors may be inserted. The inner diameter of the trocar's cannula necessarily limits the size of the end effector and drive-supporting shaft of the surgical instrument that may be inserted through the trocar.
Regardless of the specific type of surgical procedure being performed, once the surgical end effector has been inserted into the patient through the trocar cannula, it is often necessary to move the surgical end effector relative to the shaft assembly that is positioned within the trocar cannula in order to properly position the surgical end effector relative to the tissue or organ to be treated. This movement or positioning of the surgical end effector relative to the portion of the shaft that remains within the trocar cannula is often referred to as “articulation” of the surgical end effector. A variety of articulation joints have been developed to attach a surgical end effector to an associated shaft in order to facilitate such articulation of the surgical end effector. As one might expect, in many surgical procedures, it is desirable to employ a surgical end effector that has as large a range of articulation as possible.
Due to the size constraints imposed by the size of the trocar cannula, the articulation joint components must be sized so as to be freely insertable through the trocar cannula. These size constraints also limit the size and composition of various drive members and components that operably interface with the motors and/or other control systems that are supported in a housing that may be handheld or comprise a portion of a larger automated system. In many instances, these drive members must operably pass through the articulation joint to be operably coupled to or operably interface with the surgical end effector. For example, one such drive member is commonly employed to apply articulation control motions to the surgical end effector. During use, the articulation drive member may be unactuated to position the surgical end effector in an unarticulated position to facilitate insertion of the surgical end effector through the trocar and then be actuated to articulate the surgical end effector to a desired position once the surgical end effector has entered the patient.
Thus, the aforementioned size constraints form many challenges to developing an articulation system that can effectuate a desired range of articulation, yet accommodate a variety of different drive systems that are necessary to operate various features of the surgical end effector. Further, once the surgical end effector has been positioned in a desired articulated position, the articulation system and articulation joint must be able to retain the surgical end effector in that locked position during the actuation of the end effector and completion of the surgical procedure. Such articulation joint arrangements must also be able to withstand external forces that are experienced by the end effector during use.
Various surgical instruments employ a variety of different drive shaft arrangements that serve to transmit drive motions from a corresponding source of drive motions that is supported in a handle of the surgical instrument or other portion of an automated or robotically controlled system. These drive shaft arrangements must be able to accommodate significant articulated orientations of the end effector while effectively transmitting such drive motions across the articulation joint of the surgical instrument. In addition, due to the above-mentioned size constraints dictated by the sizes of trocars through which the instrument shafts must be inserted, these drive shaft components must occupy as little space as possible within the shaft. To accommodate such requirements, many drive shaft arrangements comprise several movable elements that are coupled together in series. The small sizes (e.g., 4 mm diameter) and numbers of components lead to difficult and lengthy assembly procedures that add to the cost and complexity of the device.
As further described herein, a powered stapling device can include two independently rotatable drive members: a first rotary drive member configured to effect closing of the jaws of the end effector and a second rotary drive member configured to effect firing of a staple cartridge installed in the end effector. The first and second rotary drive members are flexible and configured to extend through at least one articulation joint. In such instances, the first and second rotary drive members can transmit rotary actuation motions through the articulation joint(s) when in a non-flexed configuration and when in a flexed configuration. Exemplary rotary drive members are further described herein.
The powered stapling assembly further comprises a first jaw, a second jaw, a closure drive comprising the first rotary drive member extending through the articulation joint, and a firing drive comprising the second rotary drive member extending through the articulation joint. The second rotary drive member can be rotatable independent of the first rotary drive member. The closure drive can be activated by a closure trigger, for example, whereupon an actuation of the closure drive effects a rotation of the first rotary drive member, which transmits a rotary motion through the articulation joint to a closure screw. The closure drive further comprises a closure wedge threadably coupled to the closure screw, wherein the closure wedge is configured to engage the first jaw to move the first jaw from an open position to a closed position upon rotation of the first rotary drive member.
The firing drive can be activated by a firing trigger, for example, which is separate from the closure trigger. The rotation of the second rotary drive member is separate from the rotation of the first rotary drive member, and a closure motion is separate and distinct from a firing motion. Activation of the firing drive effects a rotation of the second rotary drive member, which transmits a rotary motion through the articulation joint to a firing screw. The firing drive further comprises a firing member threadably coupled to the firing screw, wherein the firing member is configured to camming engage the first jaw and the second jaw and to move a cutting member and/or a staple-firing sled upon rotation of the second rotary drive member.
In various instances, at least one component in the powered stapling device can be a 3D-printed component. 3D-printed components can be incorporated into an articulation system, a closure/grasping system, and/or a firing system, as further described herein. 3D printing technology can be utilized to improve component capabilities in certain instances. For example, 3D printing can allow the printed component to exhibit metamaterial properties, such that the 3D-printed components exhibits greater structural strength and stiffness while allowing precision in the forming of small detailed features and optimizing other properties of the component such as selective flexibility and/or lubrication, for example. Exemplary 3D-printed components for the powered stapling device are further described herein and include the flexible rotatable drive member(s), e.g. serial 3D-printed universal joints, the firing member or I-beam, and/or the staple cartridge and/or sub-components thereof. In one instance, the staple cartridge can be a composite plastic-metal 3D-printed component. 3D printing of various components and considerations therefor are further described herein.
A method of stapling with such surgical stapling assemblies is also contemplated. The method can include obtaining the surgical stapling assembly and activating, by the closure trigger, the closure drive, wherein the closure wedge is configured to engage the first jaw to move the first jaw from an open position to a closed position upon a rotation of the first rotary drive member. The method can further includes activating, by the firing trigger, the firing drive, wherein the firing member is configured to camming engage the first jaw and the second jaw and to advance a cutting member and a staple-firing sled during a firing motion upon a rotation of the second rotary drive member. Various applications of 3D-printed components in such assemblies are further described herein.
The end effector assembly 1000 further comprises a replaceable staple cartridge 1050 configured to be installed within the cartridge channel 1020 and a support beam 1100 positioned within the staple cartridge 1050. Discussed in greater detail below, the support beam 1100 is configured to provide additional internal support to the end effector assembly 1100 within the staple cartridge 1050. The staple cartridge 1050 comprises a cartridge body 1055 comprising a proximal end 1051, a distal end 1053, and a cartridge deck 1056. The cartridge body 1055 further comprises a plurality of staple cavities 1057 arranged in longitudinal rows defined in the deck 1056, and a longitudinal slot 1059 defined in the deck 1056 and configured to receive a portion of a firing member assembly discussed in greater detail below.
The replaceable staple cartridge 1050 is configured to removably store a plurality of staples within the staple cavities 1057. The staples are configured to be ejected from the staple cartridge and against an anvil surface 1083 of the anvil 1080 to form the staples and staple tissue captured between the deck 1056 and the anvil surface 1083. To eject the staples, a sled 1070 is pushed from a proximal end 1051 of the staple cartridge 1050 toward a distal end 1053 of the staple cartridge 1050 by the firing member assembly. As the sled 1070 translates longitudinally within the staple cartridge 1050, the sled 1070 is configured to contact and lift a plurality of staple drivers supporting the staples within the staple cartridge 1050 and form the staples against the anvil surface 1083.
To open and close the anvil 1080 relative to the cartridge channel 1020 and staple cartridge 1050, a closure drive 1210 is provided. Referring to
The closure wedge 1220 comprises an opening cam surface 1222 and closure cam nubs 1223. To close the anvil 1080, the closure wedge 1220 is moved proximally by the rotary closure drive 1221 so that the opening cam surface 1222 defined thereon engages the proximal end 1081 of the anvil 1080 thereby pivoting the anvil 1080 about the pin 1084 toward a closed position. To open the anvil 1080, the closure wedge 1220 is moved distally by the rotary closure drive 1221 so that the closure cam numbs 1223 engage the proximal end 1081 of the anvil 1080 thereby pivoting the anvil 1080 about the pin 1084 toward an open position. The closure wedge 1220 further comprises a u-shaped slot 1221 configured to allow a linearly-actuated firing drive to pass therethrough, discussed in greater detail below.
To fire the end effector assembly 1000, a firing drive 1250 is provided. The firing drive 1250 comprises a flexible firing shaft 1251 configured to be actuated by a linear output shaft of a surgical instrument handle and or robotic interface. The flexible firing shaft 1251 passes through the u-shaped slot 1221 of the closure wedge 1220 toward a firing assembly comprising a lower firing member 1260 and an upper firing member 1270. The firing shaft 1251 comprises a distal end 1252 fixed within a drive slot 1263 defined in a guide portion 1265 of the lower firing member 1260. In at least one instance, the firing shaft 1251 is rotatably supported (e.g. journaled) within the drive slot 1263 such that the firing shaft 1251 may push and pull the lower firing member 1260 while being able to rotate within the drive slot 1263. Such a configuration can permit rotation of the flexible firing shaft 1251 relative to the lower firing member 1260 while maintaining linearly-actuatable engagement. The anvil 1080 further comprises an upper anvil cap 1090 configured to be attached to the anvil 1080. The anvil cap 1090 can be welded to the anvil 1080, for example, and can serve to strengthen the anvil 1080. The channel 1020 can also comprise a channel cap 1030.
The lower firing member 1260 comprises a lower camming flange 1261 extending laterally from the lower firing member 1260, an upper camming flange 1262 extending laterally from the lower firing member 1260, and the guide portion 1265 configured to be received within the support beam 1100, discussed in greater detail below. The lower camming flange 1261 is configured to engage the channel 1020 during a firing stroke to maintain a defined clamped tissue gap between the staple cartridge 1050 and the anvil 1080. The upper camming flange 1262 is configured to engage the support beam 1100 during a firing stroke. Discussed in greater detail below, providing multiple camming flanges within the firing assembly can aid in distributing clamping forces within the end effector assembly 1000. When discussing the camming flanges, it should be understood that, as can be seen in the drawings, the flanges extend laterally outwardly from both sides of the primary body portions of the firing members.
An upper firing member 1270 is also provided. The upper firing member 1270 is configured to be advanced through the firing stroke by the lower firing member 1260. The guide portion 1265 is configured to push a guide portion 1274 of the upper firing member 1270. The upper firing member 1270 comprises an upper camming flange 1272 extending laterally from the upper firing member 1270, a lower camming flange 1273 extending laterally from the upper firing member 1270, and the guide portion 1274 configured to be received within the support beam 1100, discussed in greater detail below. The upper camming flange 1272 is configured to engage the anvil 1080 during a firing stroke. Specifically, the upper camming flange 1272 is configured to apply clamping forces to the anvil 1080 within a slot 1086. At the beginning of a firing stroke, the upper camming flange 1272 is configured to engage a proximal ramp portion 1087 of the slot 1086 to begin applying clamping forces within the end effector assembly 1000.
The lower camming flange 1273 of the upper firing member 1270 is configured to engage the support beam 1100 during a firing stroke. Such a lower camming flange 1273 can provide an additional camming flange within the firing member assembly to help distribute clamping forces within the end effector assembly 1000. The upper firing member 1270 further comprises a cutting edge, or knife, 1271 configured to cut tissue clamped between the staple cartridge 1050 and the anvil 1280. The upper firing member 1270 further comprises a drive surface 1276 defined on the front of the upper firing member 1270. The drive surface 1276 is configured to push a drive flange 1071 of the sled 1070. As the sled 1070 is advanced through the end effector assembly 1000 by the upper firing member 1270, sled rails 1072 of the sled 1070 are configured to engage staple drivers, lift the staple drivers, and eject the staples to staple tissue.
In at least one instance, the upper firing member 1270 is disposable and the lower firing member 1260 is reusable. In such an instance, the upper firing member 1270 is replaced and comes with the staple cartridge 1050 positioned in a ready to install, or ready to fire position. In other words, every time a new staple cartridge is to be installed, the user receives a new upper firing member. Such a configuration can provide a fresh knife with each fresh staple cartridge.
The lower firing member 1260 comprises a receiving hook slot 1264 and the upper firing member 1270 comprises a hook portion 1275 configured to be received within the receiving hook slot 1264. The staple cartridge 1050 including the sled 1070 and the upper firing member 1270 may be installed at an angle similar to that of the anvil 1080 positioned in its open position. Such an angle allows a user to latch, or hook, the upper firing member 1270 into the lower firing member 1260 as the user installs the staple cartridge 1050 into the channel 1020. In at least one instance, the lower firing member 1260 is configured to push and pull the upper firing member 1270 within the end effector assembly 1000 by pushing the guide portion 1274 with the guide portion 1265 and pulling the hook portion 1275 with the hook portion 1264. In certain instances, alignment and/or leveraging features intermediate the staple cartridge 1050 and the channel 1020 are configured to interact to ensure proper alignment and insertion of the staple cartridge 1050.
Because a fresh and disposable knife can be provided each time a staple cartridge is installed, the staple cartridge 1050 further comprises knife guard tabs 1060 extending upwardly from the deck 1056. The knife guard tabs 1060 may protect a user from getting cut by the knife edge 1271 when handling the staple cartridge 1050. The knife guard tabs 1060 may also prevent tissue from being inadvertently cut when tissue is being clamped by the end effector assembly 1000 and prior to the cutting motion. If tissue leaks toward the knife guard tabs 1060 prior to firing, the knife guard tabs 1060 will protect unstapled tissue before firing.
As discussed above, various types of firing and clamping forces are present within the end effector assembly 1000. The support beam 1100 is configured to help distribute the clamping forces within the end effector assembly to various components to reduce the possibility of any single component failing by increasing the distribution of forces within the end effector assembly. In end effectors without a support beam, clamping forces may be primarily applied to a channel and an anvil. The end effector assembly 1000 permits a greater distribution of clamping forces within the end effector assembly 1000.
Referring primarily to
The support beam 1100 comprises an upper surface 1110 comprising a plurality of protrusions 1111 protruding therefrom and configured to be received within corresponding slots 1058 defined the deck 1056 of the staple cartridge 1050. The protrusions 1111 may provide additional lateral and longitudinal support within the staple cartridge 1050. In other words, the protrusions 1111 can prevent the support beam 1100 from sliding laterally or longitudinally relative to the cartridge body 1055. The protrusions 1111 can also help align the support beam 1100 to the cartridge body 1055 when assembling the support beam 1100 and the cartridge body 1055. In at least one instance, the support beam 1100 is installed in the staple cartridge 1050 prior to packaging. In such an instance, the replaceable staple cartridge 1050 already comprises the support beam 1100. Thus, when the staple cartridge 1050 is replaced, a new support beam is provided.
The support beam 1100 may be slid vertically into the internal longitudinal channel 1060 of the cartridge body 1055 from the bottom of the staple cartridge 1050 opposite the deck 1056. The cartridge body 1055 further comprises lateral rails, or ledges, 1062 defined on channel walls 1061 of the internal longitudinal channel 1060. The rails 1062 are configured to fit within corresponding slots 1109 defined in the sides of the support beam 1100. The rails 1062 are configured to hold the support beam 1100 within the cartridge body 1055 and prevent the support beam 1100 from falling out of the bottom of the cartridge body 1055. The internal longitudinal channel 1060 further comprises an upper surface 1063 defined underneath a thickness of the deck 1056. The upper surface 1110 of the support beam 1100 is configured to abut the upper surface 1063.
In at least one instance, the cartridge body 1055 is overmolded onto the support beam 1100. Such a configuration can provide various internal features otherwise difficult to provide where the parts need to be separately manufactured and assembled after they are manufactured. In at least one instance, the cartridge body 1055 is overmolded and/or insert molded onto the support beam 1100 and the upper firing member 1270. In such instances, the staples, staple drivers, and sled can be assembled into the staple cartridge 1050 and support beam 1100 after the overmolding process is complete. In at least one instance, the support beam 1100 is insert molded into the staple cartridge 1050.
The support beam 1100 further comprises a longitudinal cavity 1120 comprising a lower cam slot 1121, an upper cam slot 1123, and a cylindrical slot 1122. The lower cam slot 1121 is configured to receive the upper camming flange 1262 of the lower firing member 1260. The upper cam slot 1123 is configured to receive the lower camming flange 1273 of the upper firing member 1270. The cylindrical slot 1122 is configured to receive the guide portion 1274, the guide portion 1265, and the flexible firing shaft 1251 as the upper and lower firing members 1270, 1260 are advanced through the end effector assembly 1000. The longitudinal cavity 1120 is also configured to receive the drive flange 1071 of the sled 1070 as the sled 1070 is pushed by the upper firing member 1270. In at least one instance, the flexible firing shaft 1251 is configured to be closely received within the cylindrical slot 1122 such that the cross sectional profile of each substantially matches. In such an instance, the cylindrical slot 1122 can serve to help prevent buckling of the flexible firing shaft 1251 as the flexible firing shaft 1251 is advanced through the cylindrical slot 1122. As compressive forces are experienced by the flexible firing shaft 1251, the cylindrical slot 1122 can support the length of the flexible firing shaft 1251 positioned therein and help to prevent buckling of the flexible firing shaft 1251.
As discussed above, the support beam 1100 is configured to help distribute clamping forces applied to the end effector assembly 1100 by the flanges 1272, 1273, 1262, and 1261. The guide portions 1274, 1265 may also apply vertical clamping forces by way of the flanges 1272, 1273, 1262, and 1261 and can also help distribute the clamping forces through the support beam 1100. As the upper firing member 1270 and the lower firing member 1260 are advanced through the end effector assembly 1000, the flanges 1272, 1273, 1262, and 1261 can apply vertical clamping forces to the anvil 1080, the channel 1020, and the support beam 1100. These forces may be primarily distributed between the anvil 1080, the channel 1020, and the support beam 1100; the components stronger than the staple cartridge 1050 that may primarily consist of metal. Distributing the clamping loads through these components can reduce the vertical crushing forces applied to the cartridge body 1055, itself. Such an arrangement can also reduce the likelihood of any of the flanges 1272, 1273, 1262, and 1261 shearing from their respective firing member body because they can share the vertical clamping forces along the vertical length of the end effector assembly 1000. The support beam 1100 can also provide additional support between the channel 1020 and the anvil 1080 rather than relying on just the channel 1020 and the anvil 1080 to handle all of the clamping forces applied by only a channel flange and an anvil flange.
In at least one instance, the upper and lower firing members 1270, 1260 are referred to as dual I-beams. This configuration can allow for a central longitudinal cavity such as the cylindrical slot 1122 defined in the support beam 1100 positioned between the upper flange 1262 of the lower firing member 1260 and the lower flange 1273 of the upper firing member 1270.
The guide portions 1265, 1274 may also help strengthen the firing members 1260, 1270 by providing a rounded portion engaged with the support beam 1100. The rounded portions can also provide a source of strength to the firing members 1260, 1270 because they can handle significant vertical forces. To fail, they would likely require shear-type failure rather than a bending-type failure making the rounded portions stronger than lateral flanges in certain instances. Having firing members with both lateral flanges and rounded portions can increase the overall strength of the firing assembly as it pertains to vertical clamping forces experienced within the end effector assembly 1000. All of the vertical clamping forces can serve to maintain a predefined tissue gap between the staple cartridge 1050 and the anvil 1080.
Longitudinal loads are also experienced within an end effector assembly 1000. For example, a firing member assembly can experience longitudinal loads applied by tissue on the knife 1271. A firing member assembly can also experience longitudinal loads generated by the clamping forces applied to the channel 1020 and the anvil 1080. Longitudinal loads can also be experienced when the firing member assembly abuts components in its proximal-most position. Longitudinal loads can also be experienced when the firing member assembly and/or sled abuts the distal end of the end effector assembly 1000. In such an instance, the sled and/or firing member assembly components may be pushed distally into the nose of the staple cartridge, anvil, and/or support beam. The end effector assembly 1000 also comprises features to help distribute these longitudinal loads within the end effector assembly 1000.
The support beam 1100 comprises a proximal hook 1102 (
As discussed above, the upper firing member 1270 can be disposable and removed with the staple cartridge 1050 so that a new upper firing member can be installed within a new staple cartridge. In such an instance, the upper firing member 70 can be moved into its proximal-most position after a firing stroke is completed. When the upper firing member 1270 is pulled into its proximal-most position, the anvil 1080 may be pivoted open by the closure drive 1210. As the anvil 1080 is pivoted open, the engagement surface 1087 may tilt the upper firing member proximally relative to the lower firing member 1260 and unlatch the hook 1275. At such point, the staple cartridge 1050 and upper firing member 1270 can be pried and/or unsnapped out of the channel 1020 so that a new staple cartridge, support beam, and upper firing member may be installed in the channel 1020 and the end effector assembly 1000 can be used again.
The firing member 1220 is configured to eject staples from a staple cartridge as the firing member is advanced through a staple cartridge and the support beam 1210. The support beam 1210 further comprises at least partially curved walls, or flanges, 1212 partially encompassing the central drive cavity 1211. The firing member 1220 comprises drive ramps 1222 configured to push staples and/or staple drivers out of a staple cartridge.
In at least one instance a firing member assembly is configured to push on only the firing member 1220 to advance the firing member 1220 through a staple cartridge and the support beam 1210. Such a configuration can permit the majority of firing force to be applied directly to the firing member 1220. In at least one instance, a firing member assembly is configured push on both the coupling member 1201 and the firing member 1220 to advance the firing member 1220 through a staple cartridge and the support beam 1210. Such a configuration can permit sharing of the applied firing forces and can distribute the applied firing forces throughout the coupling member 1201 and the firing member 1220.
In at least one instance, a firing member assembly is configured to push on only the coupling member 1201 to advance the firing member 1220 through a staple cartridge and the support beam 1210. Such a configuration can permit a more focused firing force application on a component made of metal rather than a component made of a polymer in certain instances. For example, the firing member 1220 may consist of a polymer while the coupling member 1201 may comprise of a metal. In at least one instance, the firing member 1220 and the coupling member 1201 comprise the same material.
Applying the firing forces to a coupling member such as the coupling member 1201, for example, can spread out the application of the firing forces laterally with respect to the longitudinal travel path of the firing member 1220. This lateral distribution can help distribute firing forces throughout the support beam 1210. The firing member 1220 is configured to surround a bottom of the support beam 1210. Such a configuration can permit the use of differently sized sleds within a cartridge channel.
The support beam 1340 comprises a longitudinal channel 1343 configured to receive the firing member assembly 1310 therein and flared ledges 1341 configured to support the firing member 1350. The lower flange 1332 is configured to apply camming forces to the support beam 1340 within the longitudinal channel 1343. Collectively, the upper flange 1331 and the lower flange 1332 are configured to maintain a predefined tissue gap between a staple cartridge and an anvil.
The sled 1350 comprises guide arms 1351 configured to be supported by the flared ledges 1341 of the support beam 1340 and drive ramps 1352 configured to eject staples from a staple cartridge. The sled 1350 can be slid onto one end of the support beam 1340 for assembly. The sled 1350 hangs from the flared ledges 1341. Such a configuration can permit use of differently sized sleds for different cartridges and the same support beam 1340. The firing member assembly 1310 is configured to push the sled 1350 through a firing stroke. The flared ledges 1341 can further serve to transfer vertical camming forces applied by the firing member assembly 1310 to the staple cartridge. In at least one instance, the vertical camming forces applied by the firing member assembly 1310 are isolated from the staple cartridge. In such an instance, the support beam 1340 is configured to experience most, if not all, of the vertical clamping forces in addition to the anvil and/or channel, for example. Such a configuration can focus vertical clamping forces onto stronger components such as those components made of metal.
Alternative support beam geometries are also contemplated. For example,
The support beam 1420 further comprises an upper channel 1422. The channel 1422 is configured to receive one or more components of a firing member assembly such those disclosed herein. The channel 1422 comprises a cylindrical cavity portion 1423 and can receive a guide portion of an upper firing member, for example.
The camming flange 1523 comprises a support portion 1524 extending upwardly into the cam channel 1531 and a flange 1525. The flange 1525 extends from the support portion 1524 to form a T-shape; however, other geometries are also contemplated. As the sled 1520 is advanced through the staple cartridge 1510 and the cartridge support 1530, the flange 1525 moves through the cam channel 1531. The cartridge support 1530 is configured to support the vertical clamping forces applied within the stapling assembly 1500 by the I-beam 1570 and the sled 1520.
The stapling assembly 1500 further comprises a deck plate 1560 positioned on a deck surface 1514 of the staple cartridge 1510. The deck plate 1560 may help distribute clamping forces within the stapling assembly 1500. The deck plate 1560 may be comprised of a metal material, for example. The deck plate 1560 comprises a plurality of apertures 1561 configured to be aligned with staple cavities defined in the staple cartridge 1510. The deck plate 1560 further comprises a longitudinal slot 1562 aligned with the longitudinal channel 1511. The cartridge support 1530 further comprises a central cylindrical support cavity 1535 configured to receive at least a portion of a firing member assembly. For example, the central cylindrical support cavity 1535 is configured to receive a linear actuator, guide portions of firing member components, and/or a guide portion of a sled, for example.
Referring primarily to
In various instances, firing member assemblies configured to be driven by firing drive screws positioned within an end effector can bind during the firing stroke. The binding can exist at the threaded coupling engagement between the firing member assembly and the firing drive screw. Such binding can be attributed to the location of the transfer of drive forces from the drive screw to the firing member assembly in certain instances. In various instances, the location of the transfer of drive force occurs immediately adjacent the threads of the firing drive screw and the receiving threads of the firing member assembly. Because the firing drive screw is generally positioned within a cartridge channel jaw, the location of the transfer force is positioned a distance away from the center of mass and/or drive center of the firing member assembly. This application of force can cause a torque load applied to the firing member assembly which may cause the threaded engagement between the firing drive screw and the firing member assembly to bind.
Various firing member assemblies are disclosed herein which may move the location of the transfer force closer to the center of mass and/or drive center of the firing member assembly to reduce incidences of binding. More specifically, these configurations can reduce the likelihood of thread binding between the firing member assembly and the firing drive screw. Such configurations may also provide a more efficient transfer of force from the firing drive screw, to the firing member assembly, to the sled and/or cutting member. A more direct force application to the sled and/or cutting member by the firing member assembly can reduce the over drive force necessary of the firing drive screw. Such a direct force applied near the center of the firing member assembly can also reduce the required drive force to maintain a predefined tissue gap using the upper and lower camming flanges of the firing member assembly. This can be attributed to centering the force application to the firing member assembly at a vertical center, or near the center, of the camming flanges.
The firing member assembly 2000 comprises a primary body portion, or distal head, 2010 and a drive nut 2030 configured to fit within a drive cavity, or receptacle, 2023 of the primary body portion 2010. The primary body portion 2010 comprises an upper portion 2011 comprising a jaw-engaging flange 2012. The upper portion 2011 further comprises a distal nose 2013, which can be used to clamp a jaw from an unclamped position. The primary body portion 2010 comprises a drive surface 2014 configured to push a sled and/or a cutting member, for example. The primary body portion 2010 further comprises a lower portion 2015 comprising a proximal portion 2016 and a distal portion 2019 defining the drive cavity 2023. The proximal portion 2016 comprises a proximal lower flange 2018 extending laterally therefrom and a drive screw duct 2017. The distal portion 2019 comprises a distal lower flange 2021 and a drive screw duct 2020. The drive screw ducts 2017, 2020 are aligned with each other are configured to receive a firing drive screw therethrough; however, the drive screw ducts 2017, 2020 are not threadably coupled with the drive screw. Rather, the drive screw ducts 2017, 2020 can comprise support channels, for example, configured to support the firing drive screw (e.g. firing screw 261 in
The drive nut 2030 is configured to be threadably coupled with a firing drive screw and is configured to apply actuation forces to the primary body portion 2010. The drive nut 2030 is configured to fit within the drive cavity 2023. The drive nut 2030 comprises a lower threaded portion 2035 comprising a camming flange 2031 configured to engage a jaw of an end effector, a threaded channel 2037 configured to be threadably coupled with a firing drive screw, and a proximal protrusion 2036 configured to fit within the drive cavity 2023. The drive nut 2030 further comprises an upper drive portion 2040 extending upwardly from the threaded portion 2035. The drive portion 2040 comprises a proximal drive surface 2041 and a distal drive surface 2043. The proximal drive surface 2041 is configured to push on a proximal drive surface 2025 of the drive cavity 2023 when the firing member assembly 2000 is moved proximally and the distal drive surface 2043 is configured to push on a distal drive surface 2024 of the drive cavity 2023 when the firing member assembly 2000 is moved distally.
As can be seen in
In at least one instance, the drive nut 2030 comprises a substantially similar cross-sectional profile to the primary body portion 2010. The drive portion 2040 is configured to apply an axial drive force to the primary body portion 2010 away from and/or off-axis with respect to the firing drive screw and threads 2037.
The firing member assembly 2330 comprises a primary body portion 2331 and a drive nut 2360 configured to fit within a drive cavity, or receptacle, 2343 of the primary body portion 2331. The primary body portion 2331 comprises an upper portion 2332 comprising an anvil-engaging flange 2333. The upper portion 2332 further comprises a distal nose 2334 which can be used to clamp an anvil jaw from an unclamped position. The primary body portion 2331 comprises a drive surface 2335 configured to push a sled and/or a cutting member, for example. The primary body portion 2331 further comprises a lower portion 2336 comprising a proximal portion 2337 and a distal portion 2339 defining the drive cavity 2343. The proximal portion 2337 comprises a proximal lower flange 2338 extending laterally therefrom and a drive screw duct. The distal portion 2339 comprises a distal lower flange 2341 and a drive screw duct 2340. The flanges 2338, 2341 are configured to engage the channel jaw 2310 to affirmatively hold a consistent tissue gap between an anvil jaw and the channel jaw 2310. The drive screw duct of the proximal portion 2337 and the drive screw duct 2340 are aligned with each other and are configured to non-threadably receive the firing drive screw 2320 therethrough.
The drive nut 2360 comprises a threaded portion 2365 configured to be threadably coupled with the firing drive screw 2320 by way of threads 2366, and a drive portion 2070. The drive nut 2360 further comprises a lower camming flange 2361 also configured to cammingly engage the channel jaw 2310 during a firing stroke. The drive portion 2370 comprises laterally opposing tabs 2371 extending upwardly from the threaded portion 2365. The drive tabs 2371 are configured to cradle, or straddle, a corresponding drive tab 2350 extending downwardly from the primary body portion 2331 and into the drive cavity 2343. The drive portion 2370 further comprises an internal cross member, or brace, 2372 connecting the tabs 2371 to each other and securing, or attaching, the drive portion 2370 to the drive tab 2350 and, thus, the primary body portion 2331. The cross member 2372 is configured to be received within a drive slot 2351 defined in the drive tab 2350. As the drive nut 2360 is actuated, forces can be applied to the primary body portion 2331 from the cross member 2372 to the drive tab 2350 within the slot 2351. Such a configuration can provide a drive force to the primary body portion 2331 off center with respect to the drive screw 2320 and nearer the center of the firing member assembly 2330. Stated another way, the drive nut 2360 can apply a drive force eccentrically with respect to a longitudinal axis of the drive screw 2320 to the primary body portion 2331. This can be seen in
The drive tab 2350 further comprises a pair of drive teeth 2353 extending downwardly therefrom within an internal channel 2367 defined in the drive nut 2360. The drive teeth 2353 are configured to mate with the threads 2321 of the drive screw 2320 directly. The teeth 2353 may bolster the threaded engagement of the firing drive screw 2320 and the firing member assembly 2330 as a whole.
In at least one instance, the drive nut 2360 is insert molded over the drive screw 2320. This permits complex shapes of a drive nut and allows for finely tuned engagement features between the drive nut 2360 and the primary body portion 2331. Such an engagement feature comprises the cross member 2372, for example. Once molded over the drive screw 2320 and through the slot 2351, the drive nut 2360 is permanently fixed to the primary body portion 2331 notwithstanding destroying the drive nut 2360 to remove the drive nut 2360 from the primary body portion 2331.
In at least one instance, the drive nut 2360 is snapped to the drive tab 2350. For example, the drive nut 2360 may comprise a degree of flexibility and a manufactured split, or break, in the material corresponding to the internal channel 2367 permitting the drive nut 2360 to be spread around the drive tab 2350 and snapped thereto. In at least one instance, the drive nut 2360 is separated between a drive tab 2350 and one side of the cross member 2372 such that the drive tabs 2359 may be pried apart to position the cross member 2372 into the slot 2351.
In at least one instance, the cross member 2372 is configured to shear off of the drive nut 2360 if a firing force between the drive screw 2320 and the drive nut 2360 exceeds a predetermined threshold. Such a configuration can provide a safety feature so as to not over drive a firing member assembly through a firing stroke when a firing member assembly experiences a higher than normal load.
The firing member assembly 2400 comprises a primary body portion, or distal head, 2410 and a drive nut 2450 configured to fit within a drive cavity, or receptacle, 2430 of the primary body portion 2410. The primary body portion 2410 comprises an upper portion 2411 comprising a jaw-engaging flange 2412. The upper portion 2411 further comprises a distal nose 2413 which can be used to clamp an anvil jaw from an unclamped position. The primary body portion 2410 further comprises a drive surface 2414 configured to push a sled and/or a cutting member, for example. The primary body portion 2410 further comprises a lower portion 2415 comprising a proximal portion 2416 and a distal portion 2420 defining the drive cavity 2430. The proximal portion 2416 comprises a proximal lower flange 2417 extending laterally therefrom and a drive screw duct 2418. The distal portion 2420 comprises a distal lower flange 2421 and a drive screw duct 2422. The flanges 2417, 2421 are configured to engage a jaw of an end effector to affirmatively hold a consistent tissue gap between the jaw and another jaw of the end effector. The drive screw ducts 2418, 2422 are aligned with each other are configured to non-threadably receive the firing drive screw therethrough. Discussed in greater detail below, the proximal portion 2416 and the distal portion 2420 each comprise registration apertures 2423 configured for use during an overmolding and/or insert molding process.
The drive nut 2450 comprises a threaded portion, or driven portion, 2451 configured to be threadably coupled with a firing drive screw by way of threads 2453 and comprises a drive portion, or driving portion, 2460. The drive nut 2450 further comprises a lower camming flange 2452 also configured to cammingly engage an end effector jaw during a firing stroke. The drive nut 2450 comprises a substantially trapezoidal shape. Discussed in greater detail below, the firing member assembly 2400 comprises a proximal clearance void, or longitudinal space, 2431 defined between the proximal portion 2416 and a proximal drive surface 2454 of the threaded portion 2451 and a distal clearance void, or longitudinal space, 2455 defined between the distal portion 2420 and a distal drive surface 2455 of the threaded portion 2451.
The drive portion 2460 comprises laterally opposing tabs 2461 extending upwardly from the threaded portion 2451. It should be appreciated that the primary body portion 2410 and the drive nut 2450 is symmetrical relative to vertical plane defined by the primary body portion 2410 but for the threads 2453. The drive tabs 2461 are configured to cradle, or straddle, a corresponding drive tab 2440 extending downwardly from the primary body portion 2410 and into an upper portion 2433 of the drive cavity 2430. The drive portion 2060 further comprises a plurality of internal cross members, or ribs, 2463 extending between the tabs 2461. The ribs 2463 secure, or attach, the drive portion 2460 to the drive tab 2440 and, thus, the primary body portion 2410. The ribs 2463 are configured to be received within a plurality of corresponding apertures 2441 defined in the drive tab 2440. As the drive nut 2450 is actuated, force can be applied to the primary body portion 2410 from the ribs 2463 to the drive tab 2440 within the slots 2441. Such a configuration can provide a drive force to the primary body portion 2331 off center with respect to the drive screw positioned within the threaded channel 2453 and nearer the center of the firing member assembly 2400. As can be seen in
The tabs 2461 of the drive nut 2450 are further configured to apply force to the primary body portion 2410 within the upper portion 2433 of the drive cavity 2430 to proximal drive surface 2443 and distal drive surface 2445. These additional drive surfaces can further center the application of drive force to the primary body portion 2410 nearer the center of the firing member assembly 2400.
As discussed above, the firing member assembly 2400 comprises clearance voids 2431, 2432 positioned between the threaded portion 2451 of the drive nut 2450 and the proximal and distal portions 2416, 2420 of the primary body portion 2410. The clearance voids are configured to further center the application of drive force within the firing member assembly 2400 from the drive nut 2450 to the primary body portion 2410. The clearance voids 2431, 2432 prevent the threaded portion 2451 from contacting the proximal and distal portions 2416, 2420 of the primary body portion 2410 thereby preventing the application of drive force immediately adjacent the drive screw configured to drive the firing member assembly 2400.
The clearance voids 2431, 2432 can also be configured to control overall deflection of the drive nut 2450. In various instances, a firing drive screw can deflect relative to the end effector in which it is positioned. This can be attributed to clamping forces applied to the jaws of an end effector during a firing stroke, among other things. Notably, as the drive screw deflects, the drive nut 2450 will be urged to deflect, or rotate, relative to the primary body portion 2410, along with the drive screw owing to the threaded engagement between the drive nut 2450 and the firing drive screw. The trapezoidal shape and clearance voids 2431, 2432 provide a degree of flexibility, or forgiveness, for the drive nut 2450 to deflect and rotate with the firing drive screw. Permitting this forgiveness within the firing member assembly 2400 can help prevent binding of the threaded engagement between the drive nut 2450 and the firing screw. A rigid firing assembly and drive nut combination, for example, may afford little to no flexibility further increasing the likelihood of thread binding, for example. In certain cases, other components of the firing member assembly such as camming flanges and/or the driving cross members discussed above may elastically deform owing to bending and/or shearing forces within an end effector assembly. In at least one instance, the drive cavity 2430 comprises a trapezoidal shape in addition to or in lieu of the drive nut 2450.
In at least one instance, the drive nut 2450 is insert molded over a drive screw. This permits complex shapes of a drive nut and allows for finely tuned engagement features between the drive nut 2450 and the primary body portion 2410. Such an engagement feature comprises the ribs 2463, for example. In at least one instance, the drive nut 2450 is overmolded onto the primary body portion 2410.
As discussed above, the proximal portion 2416 and the distal portion 2420 each comprise registration apertures 2419, 2423 configured for use during an overmolding and/or insert molding process. The registration apertures 2419, 2423 are configured to hold the primary body portion 2410 within a molding tool and are aligned at the equator, or center, of the ducts 2418, 2020. This positioning can help align the mold used for the drive nut 2450 with the ducts 2418, 2020 for manufacturing so that the drive nut 2450 and, specifically, the threaded portion 2451 is aligned with the ducts 2418, 2020. This alignment ensures that a firing drive screw is aligned within the ducts 2018, 2020 and the threaded portion 2451 upon assembly. In at least one instance, a firing drive screw and the primary body portion 2410 are both presented prior to molding the drive nut 2450. In such an instance, the drive nut 2450 can be molded around the pre-placed primary body portion 2410 and firing drive screw. In at least one instance, only the primary body portion 2410 is presented prior to molding the drive nut 2450.
The firing member assembly 2500 comprises a primary body portion 2510 and a drive nut assembly configured to fit within a drive cavity, or receptacle, 2530 of the primary body portion 25510. The primary body portion 2510 comprises an upper portion 2511 comprising an anvil-engaging flange 2512. The upper portion 2511 further comprises a distal nose 2513 which can be used to clamp an anvil jaw from an unclamped position. The primary body portion 2510 further comprises a drive surface 2514 configured to push a sled and/or a cutting member, for example. The primary body portion 2510 further comprises a lower portion 2515 comprising a proximal portion 2516 and a distal portion 2520 defining the drive cavity 2530. The proximal portion 2516 comprises a proximal lower flange 2517 extending laterally therefrom and a drive screw duct 2518. The distal portion 2520 comprises a distal lower flange 2521 and a drive screw duct 2522. The flanges 2517, 2521 are configured to engage a jaw of an end effector to affirmatively hold a consistent tissue gap between the jaw and another jaw of the end effector. The drive screw ducts 2518, 2522 are aligned with each other are configured to non-threadably receive the firing drive screw therethrough.
As discussed above, the drive nut assembly comprises the external drive portion 2550 and the internal drive nut 2560 positioned within the external drive portion 2550. In at least one instance, the internal drive nut 2560 comprises a stock drive nut comprised of a metallic material, for example. In at least one instance, the external drive portion 2550 comprises of a polymer, for example, and is overmolded and/or insert molded within the firing member assembly 2500. In such an instance, the drive nut assembly comprises a hybrid multi-material drive nut assembly and may have metamaterial properties in certain instances. In at least one instance, the external drive portion 2560 is insert molded to the internal drive nut 2550 and then the drive nut assembly is positioned within the drive cavity 2530 for assembly to a firing drive screw and the primary body portion 2510. Regardless, the drive nut assembly comprises a multi-piece arrangement.
The external drive portion 2550 comprises a lower portion 2551 comprising a flange 2552. The lower portion 2551 is configured to surround and secure the internal drive nut 2560 within the drive nut assembly. The external drive portion 2550 further comprises a drive tab 2553 positioned within an upper portion of the drive cavity 2530. The drive cavity 2530 further comprises a clearance slot 2531 positioned between the drive tab 2553 and the primary body portion 2510. Such a clearance slot 2531 can permit the drive nut assembly to float with the firing drive screw relative to the primary body portion 2510. In such an instance, the primary body portion 2510 can be constrained by various elements of an end effector assembly such as, for example, an anvil jaw and a channel jaw.
As discussed above, the external drive portion 2550 is configured to secure the internal drive nut 2560 therein and in line with a screw axis SA. The screw axis SA is defined as the center of the ducts 2518, 2522 and a primary cylindrical portion 2561 of the internal drive nut 2560. Threads 2562 are defined in the primary cylindrical portion 2561 of the internal drive nut 2560. The threads 2562 are configured to be threadably engaged, or coupled, with threads of a firing drive screw. The internal drive nut 2560 further comprises rows 2563 of gripping features 2564 configured to prevent rotation of the internal drive nut 2560 relative to the external drive portion 2550 during drive screw rotation. The external drive portion 2550 can envelop the internal drive nut 2560 during the molding process. The internal drive nut 2560 further comprises a flared proximal end 2565. The flared proximal end 2565 can aid assembly of the firing member assembly 2500 with a firing drive screw. For example, a firing drive screw can be inserted in through the duct 2518 and guided into the threads 2562 of the internal drive nut 2560 by the flared proximal end 2565.
In at least one instance, the gripping features 2564 can aid in the manufacturing process of the drive nut assembly. For example, the gripping features 2564 may fit into corresponding slots of a mold configured to hold the drive nut 2560 during molding of the external drive portion 2550.
The firing member assembly 2600 comprises a primary body portion 2610 and a drive nut 2630. The primary body portion 2610 comprises an upper portion 2611 and a lower portion 2615. The upper portion 2611 comprises an anvil-camming flange 2612. The upper portion 2611 further comprises a distal nose 2613 configured to close a jaw of an end effector from an open position to a closed position. The primary body portion 2610 further comprises a drive surface 2614 configured to push a sled and/or a cutting member, for example. The lower portion 2615 comprises a proximal portion 2616 comprising a proximal lower flange 2617 and a proximal tail extension 2618. The lower portion 2615 further comprises a distal portion 2620 comprising a distal lower flange 2621. The flanges 2617, 2621, 2612 can be configured to maintain a predefined tissue gap between a staple cartridge and an anvil throughout a firing stroke of the firing member assembly 2600.
The proximal tail extension 2618 is an extension of a screw duct, such as those described above, of the proximal portion 2616. Such a proximal tail extension can further support the firing member assembly 2500 through a firing stroke. Such a proximal tail extension may also resist deflection, or rotation, of the primary body portion 2610 which may cause a threaded engagement between the drive nut 2630 and the firing drive screw to bind.
The primary body portion 2710 comprises an upper portion 2711 and a lower portion 2715 defining a drive cavity 2730. The drive nut 2750 is configured to be positioned within the drive cavity 2730. The upper portion 2711 comprises a jaw-camming flange 2712. The upper portion 2711 further comprises a distal nose 2713 configured to close a jaw of an end effector from an open position to a closed position. The primary body portion 2710 further comprises a drive surface 2714 configured to push a sled, for example. The lower portion 2715 comprises a proximal portion 2716 comprising a proximal lower flange 2717. The lower portion 2715 further comprises a distal portion 27720 comprising a distal lower flange 2721 and a drive screw duct 2722 defined therein configured to non-threadably receive the firing drive screw 2701. The flanges 2617, 2721, 2712 can be configured to maintain a predefined tissue gap between a staple cartridge and an anvil throughout a firing stroke of the firing member assembly 2700.
In at least one instance, a profile or perimeter of the drive screw duct 2722 and/or a proximal portion of the drive screw duct can be oval shaped and/or oblong or, non-circular, for example. Such a configuration can reduce the likelihood of a deflected drive screw rubbing or interfering inside the screw ducts, which can cause stack-up losses in the event of such drive screw deflection. Stack-up losses can refer to the various problematic engagements of the drive screw and other components within the system that would result in various interferences in a scenario where the drive screw is deflected substantially. For example, if a drive screw is deflected substantially, the deflected drive screw, as discussed above, may rub against a drive screw duct, the deflected drive screw may cause the threads of a drive nut to bind, and/or the deflected drive screw may bind near its connection with a firing output shaft, for example. Providing features to minimize such stack-up losses can prevent premature failure of components and/or reduce the firing forces necessary to drive a firing member assembly, for example.
In at least one instance, the drive screw duct 2722 and/or a proximal portion of the drive screw duct comprises filleted or chamfered edges. Such a configuration can further reduce the likelihood of the ducts contacting and binding with the firing drive screw.
In at least one instance, a screw duct of a primary body portion can provide lateral and/or vertical support to the drive screw such that, should the drive screw be loaded enough to induce bending of the drive screw, the drive screw duct can prevent the drive screw from bending at least near the threaded drive nut. Such a configuration can help prevent binding between the threads of the drive screw and the threaded drive nut.
In at least one instance, a sled of a staple cartridge can comprise a distally extending cradle support feature extending from a distal end of the sled. The cradle support feature may also support the firing drive screw and help prevent bending of the firing drive screw at least near the cradle support feature. In at least one instance, the sled prevents bending of the drive screw in only one direction. In at least one instance, the sled comprises a proximal cradle support feature in addition to or in lieu of the distal cradle support feature.
The drive nut 2750 comprises a jaw-engaging flange 2751, a threaded portion 2755 configured to be threadably coupled with the firing drive screw 2701 by way of threads 2756, and laterally-opposing drive tabs 2760 extending upwardly from the threaded portion 2755. The drive nut 2750 comprises a substantially trapezoidal shape such as those drive nuts comprising a trapezoidal shape discussed herein.
The drive tabs 2760 are configured to cradle, or straddle, a corresponding drive tab 2740 extending downwardly from the primary body portion 2710. The drive tabs 2760 define a slot 2761 therebetween and each comprise a snap nub 2762 protruding inwardly therefrom. The snap nubs 2762 each comprise a sloped upper surface 2763 and a latch surface 2764. As can be seen in
In at least one instance, the drive nut 2750 is injection molded prior to being snapped onto the primary body portion 2710. In at least one instance, the drive nut 2750 is insert molded onto the primary body portion 2710 and the firing drive screw 2701. In such an instance, the drive nut 2750 may be snapped off and replaced should the drive nut 2750 wear out over time, for example.
The primary body portion 2810 comprises an upper portion 2811 comprising a flange 2812 extending laterally therefrom and a distal nose 2813 configured to close a jaw from an open position during a closure stroke. The primary body portion 2810 further comprises a drive surface 2814 configured to push a sled and/or a cutting member through a staple firing stroke, for example. Other embodiments are envisioned where various other surfaces on the front of the primary body portion 2810 are configured to drive various components such as a sled and/or a cutting member, for example. The primary body portion 2810 further comprises a lower portion 2815 comprising a proximal portion 2816 comprising a proximal lower flange 2817 and a distal portion 2820 comprising a distal lower flange 2821. Collectively, the flanges 2812, 2817, 2821 are configured to affirmatively space opposing jaws during a firing stroke and maintain a consistent tissue gap between the opposing jaws.
The drive nut 2850 is positioned within the drive cavity 2830 and is configured to be threadably coupled to a firing drive screw. The drive nut 2850 is configured to apply axial drive forces to the primary body portion 2810 as the firing drive screw is actuated to move the firing member assembly 2810 proximally and distally within an end effector. The drive cavity 2830 comprises a lower portion 2833 where the drive nut 2850 is primarily positioned and is configured to float within and comprises an upper triangular portion 2831. The upper triangular portion 2831 is configured to permit the primary body portion 2810 to flex during a firing stroke. For example, under clamping loads, the triangular portion 2831 is configured to permit the proximal portion 2816 to flex longitudinally away from the distal portion 2820. Such flexion can provide forgiveness within the firing member assembly 2800 so as to prevent binding, for example. In addition to flexion of the primary body portion 2810, the drive nut 2850 is configured to float within the drive cavity 2850. Collectively, such an arrangement can reduce binding engagement between the threaded connections and/or binding engagement between the flanges and jaws.
Various drive nuts disclosed herein comprise a laterally extending flange aligned with the proximal and distal lower flanges of the lower portions of the primary body portions. Such a flange can prevent the drive nut from rotating with a firing drive screw. Such a flange can comprise a rounded bottom so as to reduce binding engagement with a corresponding jaw. For example, the proximal and distal lower flanges can be configured to handle the majority of the clamping loads while the drive nut flange is provided for support to the drive nut but not necessarily to handle high clamping loads. Rounding the flange can reduce the overall contact with the corresponding jaw thus reducing the likelihood of the flange from binding against the corresponding jaw. In such an instance, the flange, or lateral fin, of the drive nut is configured to be loose within the corresponding jaw, such as a channel jaw, for example. This loose engagement between the flange and the corresponding jaw can provide the anti-rotation feature without requiring the flange to handle high clamping loads. In at least one instance, the lateral fin is overall thinner and comprises a top edge which is positioned below top edges of corresponding proximal and distal lower flanges of a primary body portion.
In at least one instance, the primary body portions are machined from a metallic material and the drive nuts are injection molded, insert molded, or overmolded from a polymer and/or a plastic material. Such a configuration can reduce manufacturing costs and machining complexity as various molding processes can allow for more complex geometries and shapes. Various molding processes can also allow for various order of component assembly and manufacturing. As discussed above, insert molding allows the multi-material firing member assembly to comprise various materials as well as complex integrated geometries between the different materials. Moreover, insert molding, for example, permits the firing drive screw to be positioned within the firing member assembly prior to molding of the drive nut.
Discussed in greater detail below, the firing assembly 3400 comprises a firing drive screw 3401 supported within the cartridge channel 3100. The firing assembly 3400 further comprises a firing member assembly 3409 threadably coupled to the firing drive screw 3401 which is configured to push a sled to deploy staples from the staple cartridge 3300 during a firing stroke, push a cutting member to cut tissue during the firing stroke, and maintain a consistent tissue gap between the staple cartridge 3300 and the anvil 3200 during the firing stroke.
The cartridge channel 3100 comprises a longitudinal channel cavity 3111 within which the staple cartridge 3300 is removably positioned. The cartridge channel 3100 also comprises side walls 3113 configured to support the staple cartridge 3300. In at least one instance, the staple cartridge comprises ledges configured to rest on top of the side walls 3113. The cartridge channel 3100 further comprises a base portion 3120. The base portion 3120 comprises an internal bottom surface 3121 and camming ledges 3123. A longitudinal slot 3125 is defined between the camming ledges 3123 and is configured to receive at least a portion of the firing assembly 3400 therethrough.
The anvil 3200 comprises a body portion 3210 and an anvil cap 3220 configured to be attached to the body portion 3210 within a longitudinal channel 3212. The body portion 3210 comprises an anvil surface 3211. The anvil surface 3211 comprises a plurality of staple forming pockets aligned with staple cavities 3312 defined in a deck 3311 of staple cartridge body 3310. The body portion 3210 also comprises camming ledges 3213 extending laterally inwardly into the longitudinal channel 3212 and defining a longitudinal slot 3225 therebetween. Discussed in greater detail below, the camming ledges 3123, 3213 are configured to be cooperatively engaged by corresponding flanges of the firing member assembly 3409 to affirmatively space the jaws 3010, 3020 relative to each other. In at least one instance, a predefined tissue gap is defined between the cartridge deck 3311 and the anvil surface 3211 during a firing stroke by way of the engagement of the flanges of the firing member assembly 3409 with the camming ledges 3213, 3123.
The staple cartridge 3300 further comprises deck protrusions, or pocket extenders, 3314 configured to extend the effective height of each staple cavity 3312. The deck protrusions 3314 can be configured to help grip tissue clamped between the jaws 3010, 3020. The staple cartridge 3300 further comprises a longitudinal slot 3315 configured to receive at least a portion of the firing member assembly 3409 therethrough. As discussed above, a sled and/or cutting member is configured to be advanced through the jaws 3010, 3020 to cut tissue and fire staples during a staple firing stroke with the firing assembly 4400.
The firing assembly 3400 comprises the firing drive screw 3401 and the firing member assembly 3409 threadably coupled to the firing drive screw 3401. The firing member assembly 3409 comprises a primary body portion 3410, a drive nut 3450 configured to be threadably coupled to the firing drive screw 3401, and a rear support brace 3430. The primary body portion 3410 comprises an upper portion 3411 comprising an anvil-engaging flange 3412 and a distal nose portion 3413. The anvil-engaging flange 3412 is configured to move within the longitudinal channel 3212 and, more specifically, configured to apply clamping pressure to the upper surface 3214 of the camming ledges 3213. In at least one instance, the anvil cap 3220 is configured to provide an upper boundary to the anvil-camming flange 3412. Nonetheless, the anvil-camming flange 3412 is configured to move within the longitudinal channel 3212 during a firing stroke to apply camming forces thereto to ensure a consistent tissue gap distance between the cartridge deck 3311 and the anvil surface 3211.
The primary body portion 3410 further comprises a lower portion 3415 comprising a proximal portion 3416 comprising a channel-camming flange 3417 and a screw duct 3418 configured to non-threadably receive the firing drive screw 3401 therethrough. The lower portion 3415 further comprises a distal portion 3420 comprising a channel-camming flange 3421 and a screw duct 3422 configured to non-threadably receive the firing drive screw 3401. The drive nut 3450 is configured to fit between the proximal portion 3416 and the distal portion 3420. The drive nut 3450 comprises a threaded portion 3451 configured to be threadably coupled to the firing drive screw 3401 and comprising a channel-camming flange 3452. In at least one instance, the channel-camming flange 3452 comprises a thickness that is less than the thickness of the channel-camming flanges 3417, 3421. The drive nut 3450 also comprises a drive tab 3460 extending upwardly toward the primary body portion 3410. The drive nut 3450 is configured to apply axial drive forces proximally and distally to the primary body portion 3410 to move the firing member assembly 3409 through jaws 3010, 3020. The channel-camming flanges 3417, 3452, 3421 are configured to apply camming forces to the camming ledges 3123. Collectively, the camming flange 3412 and the flanges 3417, 3452, 3421 are configured to maintain a consistent tissue gap distance between the cartridge deck 3311 and the anvil surface 3211.
Firing member assemblies can be subject to loads which would cause off center moment loading. For example, the anvil ledges engaged with upper camming flanges 3412 can apply an off-center moment load to the firing member 3400 in certain instances, such as when thick and/or tough tissue is clamped between the jaws. It can be advantageous to provide a means for counter-acting such off center moment loading. The firing member assembly 3409 comprises a rear support brace 3430 extending at an angle proximally from the upper portion 3411 of the primary body portion 3410. The rear support brace 3430 comprises a strut member 3431 and an arcuate brace portion 3433 extending from the strut member 3431. The arcuate brace portion 3433 comprises laterally extending flanges 3435 configured to support the rear support brace 3430 and counteract moment loading of the primary body portion 3410. The flanges 3435 are configured to ride against the internal bottom surface 3121. Notably, the flanges 3435 ride above the camming ledges 3123 such that the flanges 3432 of the rear support brace 3430 and the channel-camming flanges 3421 contact opposite sides of the base portion 3120 of the channel 3100.
In at least one instance, should the primary body portion 3410 be loaded and cause rotation in an opposite direction, the flanges 3435 may provide flexibility to lift off of the internal bottom surface 3121 and resist torqueing of the anvil-camming flanges 3412 out of substantially parallel alignment with the longitudinal channel 3214. The rear support brace 3430 can be configured to provide a degree of flexibility so as to permit some flexion of the primary body portion 3410 during loading while preventing a magnitude of flexion that would cause binding if the threaded engagement between the drive nut 3450 and the firing drive screw 3401. In certain instances, the rear support brace 3430 can act as a spring feature for balancing the load.
Embodiments are envisioned where the flanges 3435 are positioned under the ledges 3123. Embodiments are also envisioned where two sets of flanges are provided. One set of flanges can be positioned above the ledges 3123 and one set of flanges can be positioned below the ledges 3123.
In various instances, the rear support brace 3430 acts a spring member for the firing member assembly 3409 to balance various loads experienced by the firing member assembly 3409. Moreover, a clearance is provided between the arcuate brace portion 3433 and the firing drive screw 3401. Such a configuration can prevent I-beam roll, for example, and balance an I-beam, or firing member assembly, throughout a staple firing stroke. Embodiments are envisioned where the arcuate brace portion 3433 is also threaded and threadably coupled to the firing drive screw 3401.
In various instances, the geometries of various firing member components can be optimized. Referring to
The knife 3750 is a component of the sled 3760 and is mounted to the sled 3760 at a pivot. During a distal firing motion, the knife 3750 can assume the upright configuration shown in
In at least one instance, the supports 3818 comprise plastic arms. In such an instance, the supports 3818 can be pried out of the way of a firing member assembly by the firing member assembly as the firing member assembly passes by the supports 3818 during a firing stroke. Such a configuration can be advantageous at least because once the firing member assembly reaches the location of the supports 3818 during the firing stroke, the firing member assembly can then, itself, support the firing drive screw 3801 and prevent buckling thereof.
In various instances, balancing an I-beam, or firing member assembly, can be advantageous so as to optimize loading of the firing member assembly between the anvil camming flanges and channel camming flanges, for example. Various forces are applied to the firing member assembly. These forces are applied by the firing drive screw and/or the drive nut, the anvil camming flanges, the channel camming flanges, the tissue, and/or the sled configured to deploy staples. It may be advantageous to balance these forces such that the driving force provided by the drive screw is driving the firing member assembly at an optimal location. A less than optimal driving force application may result in unnecessary roll, rotation, and/or rocking, of the firing member assembly relative to the firing screw and/or relative to a longitudinal axis defined by the firing screw. Torsional loads may cause such roll, rotation, and/or rocking, for example. Applying the drive force at a location to optimally counteract the predictable torsional loads applied to the firing member assembly can help prevent the roll, rotation, and/or rocking of the firing member assembly.
In various instances, the channel/anvil camming flanges, or pins, comprise width and length that is configured to be tuned relative to their corresponding slots through which they are received. In at least one instance, the greater the length of the flange along the longitudinal axis, the less clearance is required within its corresponding camming slot. In other words, the corresponding camming slot may comprise a geometry to more tightly receive the flange. On the other hand, the lesser the length of the flange along the longitudinal axis, the greater the clearance required within its corresponding camming slot. In other words, the corresponding camming slot may comprise a geometry to more loosely receive the flange. In at least one instance, an ideal length of one or more of the flanges may comprise about twice the width of the primary body portion of the firing member assembly. Notably, the thickness of the of primary body portion is synonymous with the portion of the primary body portion configured to travel through the longitudinal staple cartridge slot.
In various instances, drive nuts disclosed herein are configured to float up and down relative to the primary body portion of the firing member assembly, up and down and side to side relative to the primary body portion of the firing member assembly, and/or side to side relative to the primary body portion of the firing member assembly. The floating of the drive nut can reduce the likelihood of the drive screw binding with various other components. As discussed above, a drive nut may be rigidly welded to a primary body portion in certain instances.
In various instances, the various components of the surgical stapling assemblies disclosed herein can be assembled in a particular order so as to prevent inadvertent disassembly. For example, various components can be introduced during assembly after the firing member assembly is introduced, which would otherwise tend to fall out or be disassembled inadvertently without a holding force in the assembly provided by flanges of the firing member assembly, for example. Components and sub-assemblies in addition to or other than the firing member assembly may also provide assembly holding forces, for example. For example, a drive screw can be pre-loaded, as discussed herein, and can provide an internal assembly holding force during assembly. The drive screw may be installed into the surgical stapling assembly prior to various other components. In certain instances, the above-discussed assembly holding forces could actually encourage inadvertent disassembly of one or more components. In such instances, such components would be installed after certain components so as to ensure that, when such components are installed, the entire assembly at that point in time can maintain an assembled state so as to reduce the likelihood of inadvertent disassembly.
In at least one instance, a plastic and/or metal injection molded (MIM) drive nut of a firing member assembly can first be assembled to the primary body portion of the firing member assembly. Once the drive nut is positioned, then a drive screw can be threaded into the drive nut through corresponding ducts of the primary body portion. Assembling in such a manner allows the drive screw to couple the drive nut and primary body portion of the firing member assembly so as to prevent inadvertent disassembly of the drive nut and the primary body portion.
Further to the above, the drive screw ends can then be coupled to their corresponding supports with their corresponding attachment means. For example, any bearings and/or springs used, for example, can all be assembled at this time. This would prevent the firing member assembly from running off of the proximal end or distal end of the drive screw. Additionally, should the firing member assembly be overdriven, for example, the thrust bearings would already be presented and the firing member assembly would predictably deflect a channel for example, through the thrust bearing and/or channel support flange, for example, rather than abnormally loading only the thrust bearing and or distal head portion of the drive screw, for example. If the firing member assembly is advanced into a thrust bearing and/or distal head portion of the drive screw, the firing member assembly may exert an unexpected load onto the thrust bearing and/or distal head portion of the drive screw and possibly cause premature failure of the thrust bearing and/or distal head portion, for example. This can be attribute to not being assembled to their corresponding channel support flanges, for example, with which the ends of the drive screw are designed to interact and cooperatively load. Without the channel flanges and the channel, for example, a distal head portion of a drive screw can be sheared off if prematurely loaded prior to the installation of the drive screw into the channel support flanges, for example.
In at least one instance, a firing member assembly is advanced beyond its distal-most position during actual operation of a surgical stapling assembly on the drive screw so that the flanges of the firing member assembly can be inserted within their corresponding slots in the anvil, channel, and/or staple cartridge, for example. Once the flanges are aligned with their corresponding slots, the drive screw can be rotated to move the firing member assembly proximally thereby moving the flanges into their corresponding slots. As such point, the drive screw can then be seated within its support flanges, for example. In at least one instance, using such a sequential assembly method can prevent the flanges from coming loose out of their respective slots during assembly, for example.
In at least one instance, the various supports positioned within the proximal end of an end effector assembly are configured to support a proximal end of a firing drive screw and are configured to support a closure drive screw interlock with a cartridge channel, for example. In such an instance, an anvil can be introduced to the end effector assembly and pinned to the cartridge channel with a pivot pin after the various supports are positioned in the cartridge channel. The pivot pin, itself, can prevent vertical decoupling loads from decoupling various components of the end effector assembly. In such an instance, lateral channel walls along with lateral tissue stops, lateral walls of the anvil configured to straddle the lateral channel walls upon clamping tissue, can prevent lateral decoupling loads from decoupling various components of the end effector assembly. In various instances, the end effector assembly is configured such that each component and sub-assembly is assemble-able and disassemble-able in one unique sequential manner. This would ensure that the system can be assembled in only one way which provides support and prevents inadvertent disassembly during assembly.
In various instances, one or more components of surgical stapling assemblies discussed herein can be 3D printed. More specifically, such components can be made using a graphite-based selective laser sintering process, which can be an additive manufacturing process allowing for complex geometries of parts while eliminating the need for expensive tooling. Specifically, thrust bearings and/or drive nuts of firing member assemblies can be manufactured using this process. In various instances, a drive nut can be 3D printed out of graphite and steel, for example. In at least one instance, between about 1% and about 5% of the component comprises graphite and the rest of the component comprises a steel material. In such an instance, the exposed graphite of the drive nut, for example, could provide a degree of lubrication within the threaded connection, for example.
In various instances, firing member assemblies are configured to be driven by firing drive screws positioned within an end effector. The firing member assemblies and/or the firing drive screws can experience various loads during a firing stroke. For example, a firing member assembly can experience loads applied thereto by tissue as the firing member assembly is advanced through a firing stroke. The firing member assembly can be subject to various loads applied thereto by the firing drive screw itself. The firing member assembly can also experience loads generated by the engagement of camming flanges of the firing member assembly with a cartridge channel jaw and/or an anvil jaw. The firing drive screw can also be subject to various loads during various stages of use of an end effector assembly within which the screw is positioned. For example, the firing drive screw may be subject to bending loads owing to camming and/or clamping forces applied within the end effector assembly when the jaws are closed to clamp tissue and/or when tissue is further clamped by flanges of a firing member assembly during a staple firing stroke. Discussed herein are various arrangements configured to manage the various loads experienced by firing member assemblies and firing drive screws. Such arrangements can reduce binding of a firing drive screw with various components, for example. Such arrangements can also be employed with a closure drive system. For example, in various instances, an end effector assembly can comprise a separate closure drive screw configured to open and close a jaw relative to another jaw. In such instances, the closure drive screw can also be subject to various loads which may cause bending and/or binding with various drive components, for example
The rotary drive assembly 5030 comprises a threaded screw portion 5031 and a distal end 5033 supported by the distal portion 5011 of the cartridge channel 5010. The distal end 5033 of the rotary drive assembly 5030 comprises two thrust bearings, or bushings, 5034 for example, configured to contact the arcuate flanges 5023. The distal end 5033 further comprises a distal support head 5035 configured to support the thrust bearings 5034 against the arcuate flanges 5023. The distal support head 5035 may be formed using an orbital forming process on a distal end of a firing drive screw, for example. This forming process can take place, for example, after one or more bushings and/or bearings are positioned on the distal end of the firing drive screw.
The arcuate flanges 5023 define a float cavity 5025 therebetween in the distal portion 5011 of the cartridge channel 5010. A portion 5032 of the rotary drive assembly 5030 is configured to be supported within the float cavity 5025 such that the distal end 5033 of the rotary drive assembly 5030 is permitted to float within the float cavity 5025 upon deflection of the cartridge channel 5010, for example. In such an instance where the distal portion 5011 of the cartridge channel 5011 is deflected downwardly, the distal end 5033 of the rotary drive assembly 5030 can remain relatively unloaded by floating within the float cavity 5025. As can be seen in
Embodiments are envisioned where there is no vertical limiting feature defined by the bottom 5020 of the cartridge channel 5010. In at least one instance, the annular cradle slot 5022 is configured to support the bushings 5034 and/or the distal support head 5035. In at least one instance, the annular cradle slot 5022 defines a lower vertical limiting feature, or stop, configured to prevent the distal end 5033 of the rotary drive assembly 5030 from floating below a certain threshold defined by contact between the bushings 5034 and/or 5035 with the annular cradle slot 5022, for example. In at least one instance, the vertical slot portion 5026 and the flanges 5023 define an upper vertical limiting feature, or stop, configured to prevent the distal end 5033 of the rotary drive assembly 5030 from floating above a certain threshold defined by contact between the distal end 5033 and the flanges 5023.
As can be seen in
In at least one instance, a proximal end of the rotary drive assembly 5030 is fixed in place. In at least one instance, the proximal end of the rotary drive assembly 5030 is also configured to float relative to the cartridge channel 5010.
In at least one instance, a spring is provided at a proximal mounting location and/or distal mounting location of a firing drive screw within a cartridge channel, for example. The spring is configured to bias the firing drive screw into a neutral configuration. In at least one instance, the spring is configured to counteract bending loads applied to the firing drive screw. In at least one instance, one or more magnets are provided within a mounting location and a screw magnet of opposite polarity is provided on the firing drive screw at the mounting location. Such a configuration can bias the firing drive screw toward a neutral configuration as well as counteract bending loads applied to the firing drive screw. Such a spring may comprise a vertically deformable bushing, for example. In at least one instance, a coil spring is employed within the mounting location.
In various instances, the flexible floatation mounts described herein are configured to permit a limited vertical range of floatation of the rotary drive assembly relative to the cartridge channel. For example, a vertical floatation range of 0.0002-0.0003 inches can be permitted by the distal mounts described herein. In other instances, a vertical floatation range of 0.001 inches can be permitted and, in certain instances, of up to 0.0015 inches can be permitted by the flexible floatation mounts. The size of the vertical floatation range can be configured to avoid lateral loads being applied to the rotary drive assembly, which is well-suited for tension loads but may result in bending under lateral loads. Instead, the rotary drive assembly can float within the limited vertical range of floatation to ensure the rotary drive assembly is not laterally loaded. Even when thick and/or tough tissue is clamped between the jaws and the anvil is bowed in the clamped configuration, the vertical range of floatation can allow shifting of the rotary drive assembly and avoid lateral loads on the rotary drive assembly.
In at least one instance, flanges of a firing member assembly are configured to define the limited vertical range of floatation of a firing drive screw through the threaded connection between the firing member assembly and the firing drive screw. For example, an anvil-engaging flange may contact an upper portion of an anvil slot and/or a channel-engaging flange may contact an upper portion of a channel slot to provide an upper stop for the firing drive screw. Further to the above, the anvil-engaging flange may contact a lower portion of the anvil slot and/or the channel-engaging flange may contact a lower portion of the channel slot to provide a lower stop for the firing drive screw. In at least one instance, a drive nut cutout, drive cavity, and/or receptacle configured to receive a drive nut is configured to further define the vertical range of flotation of a firing drive screw.
Any suitable bushings and/or bearings can be employed with any of the various rotary drive assemblies and/or firing drive screws disclosed herein. In at least one instance, a compression bushing can be used at a proximal or distal end of a firing drive screw within a cartridge channel. Such a compression bushing can provide a compressive pre-load to a firing drive screw, for example, once installed in a cartridge channel. Such a compressive pre-load can prevent the firing drive screw from disengaging from any support elements supporting the firing drive screw in the cartridge channel. For example, a compression bushing can be used at one more ends of the firing drive screw to prevent the proximal end and/or distal end of the firing drive screw from disengaging from a corresponding support such as, for example, arcuate flanges extending from the cartridge channel.
A compressive pre-load can be induced by a spring, a longitudinal screw, and/or a rivet, for example, on a compression bushing. In such an instance, the compression bushing will tend to expand radially under a compressive pre-load. Such radial expansion can fill an annular cradle support and/or float cavity such as those discussed herein. This tendency for the compression bushing to fill such slots and/or cavities, for example, can help prevent the firing drive screw from longitudinally, laterally, and/or vertically de-seating from the support elements such as the arcuate flanges discussed herein.
In at least one instance, a bushing and/or bearing configure to support a rotary drive assembly disclosed herein comprises a flange extending radially outward therefrom. The flange is configure to be positioned on the side of the channel support flange opposite the distal support head of the firing drive screw. The radial flange can then be biased away from the channel support flange and, thus, the distal support head by a spring. In such an instance, the spring would push against the channel support flange and the radial flange of the bushing, for example. In such an instance, the radial flange and the spring can be configured to pull the distal support head into the channel support flange. In at least one instance, this pulling force applied to the distal support head can be configured to seat the distal support head such that the firing drive screw cannot be lifted directly out of the channel support flange without first pulling the firing drive screw distally and overcoming the force applied by the spring. Overcoming the force would then disengage the distal support head from the channel support flange only then allowing the firing drive screw to be lifted out of the channel support flange.
Further to the above, the spring can be compressed by a distal tightening screw configured to pull the distal support head proximally toward the channel support flange relative to the bushing comprising the radial flange, for example. Other embodiments are contemplated where a bearing is positioned distal to the channel support flange and then a nut is threaded onto the drive screw. The nut can then be turned to compress the bearing against the channel support flange.
In at least one instance, a proximal and/or distal end of a drive screw is support within a channel and/or anvil, for example, by way of more than one support flange extending from the channel and/or anvil. For example, the more than one support flange can comprise a plurality of flanges in series with each other. One or more corresponding thrust bearings of the drive screw can be configured to be supported against the more than one support flange. Such a configuration can help support the drive screw should the drive screw want to move proximally and distally, for example. In at least one instance, a separate thrust bearing is provided on the drive screw for each support flange extending from the channel and/or anvil, for example. In at least one instance, each thrust bearing is configured to engage only its corresponding support flange. In other instances, one thrust bearing is provided between two flanges where the one thrust bearing is configured to engage both flanges in a proximal direction and a distal direction. In such an instance, one or more additional thrust bearings can be provided proximal to both support flanges and/or distal to both support flanges. Such arrangements may provide multiple thrust surfaces as opposed to a single thrust surface for a drive screw.
In at least one instance, a thrust surface of a support flange, for example, comprises a recessed inner donut hole, for example. In such an instance, a thrust bearing of a drive screw can be configured to be received within the recessed inner donut hole. In at least one instance, a deformable thrust bearing is compressed into the recessed hole. In at least one instance, the deformable thrust bearing comprises a diameter which is greater than an outer diameter of the recessed hole. Such a configuration can provide additional support to the drive screw. In at least one instance, the deformable thrust bearing comprises a soft, low-density polyethylene washer. In at least one instance, the thrust bearing is compressed using an orbital forming process. In at least one instance, the thrust bearing can comprise a threaded washer, for example.
In various instances, springs and/or magnets can be integrated in various components of an end effector assembly to allow various components of the end effector assembly to float and/or move relative to each other under load. For example, springs and/or magnets can be integrated in proximal and/or distal mount locations where a firing drive screw is supported by a cartridge channel, for example. Another example includes integrating springs and/or magnets in a firing member assembly to permit a drive nut thereof to float relative to a primary body portion, for example.
The magnetic elements 5360 can comprise cylindrical rods, or pins, and/or rectangular rods, or pins, for example. Nonetheless, one of the magnetic elements 5360 is attached to and spring loaded by a spring 5361 within a proximal channel 5363 defined in the proximal portion 5316. Another one of the magnetic elements 5360 is attached to and spring loaded by a spring 5361 within a distal channel 5365 defined in the distal portion 5320. To mount the drive nut 5350 to the body portion 5310, the magnetic elements 5360 are retracted in their respective channels 5363, 5365 by externally presented magnets 5370 (
Specifically, the magnetic elements 5360 are configured to reside within a corresponding proximal channel 5351 defined in the drive nut 5350 and a corresponding distal channel 5355 defined in the drive nut 5350. The channels 5351, 5355 comprise a width and/or diameter which is greater than the width and/or diameter of the magnetic elements 5360. This difference in size allows the drive nut 5350 to float relative to the primary body portion 5310. The amount of floatation of the drive nut 5350 relative to the primary body portion 5310 may be defined and limited, at least in part, by the difference 5371 in size of the magnetic elements 5360 and the channels 5351, 5355. In at least one instance, one of the width and/or height is substantially the same as the width and/or height of the magnetic elements 5360. Such a configuration will permit floatation of the drive nut in only one plane. For example, if the vertical height of the magnetic elements 5360 and the drive nut channels 5351, 5355 are substantially the same and the width of the drive nut channels 5351, 5355 are greater than the width of the magnetic elements 5360, the drive nut 5350 is permitted to float only horizontally, or laterally, with respect to the primary body portion 5310. On the other hand, where the widths are substantially the same and the vertical heights differ, the drive nut 5350 is permitted to float only vertically with respect to the primary body portion 5310. Any floatation may be ultimately limited by the size of drive screw ducts of the proximal portion 5316 and the distal portion 5320, as discussed in greater detail above.
In at least one instance, the channels, or pockets, 5363, 5365 may be machined into a metal primary body portion. In at least one instance, the channels, or pockets, 5351, 5355 may be part of an injection mold when manufacturing the drive nut 5350. In at least one instance, the magnetic elements 5360 can comprise steel pins, for example. In at least one instance, the arrangement discussed above can reduce the need for exact alignment of an internal threaded channel defined in the drive nut to be coupled with the firing drive screw with corresponding drive screw ducts of the primary body portion. In such an instance, if the internal threaded channel is molded slightly off center with respect to the corresponding drive screw ducts of the primary body portion, the magnetic element arrangement discussed above can permit the drive nut 5350 to float into alignment with the primary body portion 5310. The flotation of the drive nut 5350 may also help prevent binding of the drive nut 5350 and a firing drive screw, for example. In at least one instance, a third degree of motion can be controlled and defined by the proximal portion 5316 and distal portion 5320 which can define the amount flotation, if any, which is permitted along a longitudinal axis relative to the primary body portion 5310.
In various instances, a firing drive screw can be configured so as to provide a compliant drive screw which can accommodate various loads experienced by the firing drive screw and reduce the likelihood of drive screw binding, for example. Such a compliant drive screw can automatically adapt and/or conform under different loaded conditions, for example. Such compliance may result in changing the shape of the drive screw itself, as discussed in greater detail below.
In at least one instance, the inner diameter of the helical member 5554 is configured to surround and contact an outer diameter of the flexible core member 5553. The helical member 5554 may comprise a type of coil spring, for example. The flexible core member 5553 may comprise a flexible cable, for example. In at least one instance, the helical member 5554 is manufactured with an inner diameter that is less than the outer diameter of the flexible core member 5553. In such an instance, the helical member 5554 can be counter-rotated to increase its inner diameter for assembly onto the flexible core member 5553. Once the helical member 5554 is positioned on the flexible core member 5553, the helical member 5554 can be released. Once the helical member 5554 is released, it will bias back to its neutral, non-loaded configuration and synch, or pinch, itself tightly to the flexible core member 5553. In at least one instance, the helical member 5554 is welded to the flexible core member 5553 at various locations along the length of the flexible core member 5553.
In at least one instance, the nut 5560 is configured to be tightened and/or loosened to provide the desired configuration of the helical member 5554. Tightening and/or loosening the nut 5560 can also allow for adjustment of tension of the flexible core member 5553. Adjusting the tension of the flexible core member 5553 can directly correlate to the amount of deflection permitted of the flexible core member 5553 along its length under load. A tighter cable may permit less flexion than a looser cable, for example. This can be tuned during manufacturing to a desired tension, for example. Embodiments are envisioned where it is tuned differently for different size cartridges and/or surgical stapling systems requiring different firing forces, for example.
In various instances, a firing drive screw is provided that is configured to minimize plastic deformation thereof under various loads. Such a firing drive screw can comprise variations in cross-sectional geometry along its longitudinal length. Such variations can result in a portion of a firing drive screw which is more flexible than an adjacent portion of the firing drive screw. The more flexible portion of the firing drive screw may be subject to greater bending loads than the less flexible portion, for example. Variations of the firing drive screw can be located at a proximal portion, an intermediate portion, a distal portion, or any combination thereof. Locations of variations can depend on application and areas of the firing drive screw subject to the highest loads, for example.
In at least one instance, various portions along the length of a firing drive screw comprise overmolded plastic threaded sections, for example. In at least one instance, various overmolded portions can accommodate manufacturing tolerance differences between a drive nut of a firing assembly and a firing drive screw thread profile and, in certain instances, can provide a more lubricious threaded engagement surface, for example. In at least one instance, a central section, midway through a firing stroke, section of a firing drive screw comprises a varied cross-sectional profile.
The shaft coupling 5810 may be a beam coupling, for example. The coupling 5810 comprises a proximal hub 5811 configured to be attached to a distal end of a portion of a firing drive screw, a distal hub 5813 configured to be attached to a proximal end of another portion of a firing drive screw, and helical cutouts 5815 configured to flex during scenarios of shaft misalignment.
The shaft coupling 5820 may be a bellow coupling, for example. The coupling 5820 comprises a proximal hub 5821 configured to be attached to a distal end of a portion of a firing drive screw, a distal hub 5823 configured to be attached to a proximal end of another portion of a firing drive screw, and a flexible corrugation portion 5825 configured to flex during scenarios of shaft misalignment.
The shaft coupling 5830 may be a curved jaw coupling, for example. The coupling 5830 comprises a proximal hub 5831 configured to be attached to a distal end of a portion of a firing drive screw, a distal hub 5833 configured to be attached to a proximal end of another portion of a firing drive screw, and a spider gear comprising teeth 5835. The spider gear can comprise of a softer material configured to flex between the hubs 5831, 5833 while retaining drive engagement between the spider gear, the proximal hub 5831, and the distal hub 5833.
In an end effector assembly, such couplings 5810, 5820, and 5830 can permit bending of a firing drive screw at the coupling itself and reduce bending within the threaded shafts themselves. As discussed herein, bending of a threaded shaft can cause binding of a firing drive screw and a firing member assembly which are threadably coupled to each other.
The closure drive screw 6013 comprises a threaded section 6014 and a distal non-threaded section 6015. The closure nut 6020 further comprises an internal threaded section 6025 configured to be threadably engaged with the threaded section 6014 such that the closure nut can be advanced proximally and distally along the threaded section to open and close the jaw 6003. In at least one instance, the closure nut 6020 is configured to be 3D printed onto the pre-manufactured closure drive 6010. The closure nut 6020 may comprise of a metal material and/or a polymer material, for example. The closure nut 6020 is configured to be printed around the distal non-threaded section 6015. Such an arrangement can allow the internal threaded section 6025 of the closure nut 6020 to be printed with an effective diameter which is slightly smaller than if the closure nut were printed directly around the threaded section 6015. Printed on the closure drive screw 6013, the closure nut 6020 can be effectively trapped between the bearing 6012 and bearing portion 6016 preventing inadvertent disassembly after manufacturing. In at least one instance, the bearing 6012 and the bearing portion 6016 are printed on the drive screw 6013 prior to printing of the closure nut 6020.
In at least one instance, one or more portions of the closure drive 6010 are also 3D printed. In such an instance, the closure drive 6010 can be 3D printed to be a size that is slightly larger than the desired size. For example, the closure drive 6010 can be scaled 0.5% larger than the desired size. In such an instance, various details of the closure drive 6010 requiring precise dimensions can be machined after the closure drive 6010 is printed. Such a manufacturing process can decrease machining waste and reduce the amount of time required to manufacture one or more parts, in certain instances. For example, a closure drive comprising a shaft with a non-threaded section and a threaded section where the non-threaded section comprises a diameter less than or equal to a minor diameter of the threaded section requires at least the removal of a ring of material with a width of the thread depth at the non-threaded section. 3D printing such a closure drive can allow the non-threaded section to be printed much closer to the minor diameter of the threads, albeit slightly larger for the reasons discussed above.
The drive screw 6110 further comprises a distal end 6113 comprising an annular slot 6114 and a thread 6115. The annular slot 6114 is configured to support the restraining collar 6120 therein. The thread 6115 is configured to permit the installation of the restraining collar 6120 as well as prevent the removal of the restraining collar 6120 from the drive screw 6110. The restraining collar 6120 comprises a proximal ramp surface 6122 defined therein. The proximal ramp surface 6122 is configured to permit the restraining collar 6120 to be screw onto the thread 6115 of the drive screw 6110 such that the restraining collar 6120 can clear the thread 6115 and fit an internal support surface 6121 to the annular slot 6114. Once installed onto the drive screw 6110, the thread 6115 resides distal to a distal, vertical, wall 6123 defined in the restraining collar 6120. The distal wall 6123 is configured to prevent the restraining collar 6120 from being pulled off of the distal end 6113 of the drive screw 6110.
In at least one instance, the drive screw 6110 is machined and/or 3D printed from a metallic material. In at least one instance, the restraining collar 6120 is molded and/or 3D printed from a polymer. In at least one instance, the restraining collar 6120 is constructed from a material which permits a degree of flexibility so as to allow the restraining collar 6120 to flex around and clear the thread 6115. A great degree of force may be required to install the restraining collar 6120 onto the drive screw 6110. In at least one instance, a greater degree of force may be required to remove the restraining collar 6120 from the drive screw 6110 at least owing the distal wall 6123.
In at least one instance, such a restraining collar can be used with a firing drive screw configured to threadably drive a firing member assembly. In various instances, such a restraining collar is used at a proximal end of a drive screw, a distal end of a drive screw, or both ends of a drive screw.
In at least one instance, a restraining collar is installed onto a drive screw with a lock washer. In such an instance, the thread and/or threads that the restraining collar is configured to be installed over can be configured so as to further tighten the locking engagement of the lock washer and the restraining collar when the drive screw is under load, for example. For example, each end of the restraining collar can comprise threads comprising opposite thread directions. For example, a proximal end of the restraining collar can comprise left handed threads and a distal end of the restraining collar can comprise right handed threads or vice-versa. Once installed, the restraining collar can be introduced to the opposite thread pattern such that, as the restraining collar is encouraged off of the distal end of the drive screw, the opposite thread pattern can serve to further tighten the locking engagement of the lock washer and restraining collar.
In at least one instance, a firing drive screw and/or closure drive screw can be 3D printed. In such instances, various features can be printed directly with the drive screw. For example, support flanges, bearings, restraining collars, etc., can be printed directly onto the drive screw. In at least one instance, one or more of these various features can comprise a different material than the drive screw itself. In such instances, the features comprising a material different than the drive screw can be printed directly onto the metal, for example, drive screw. In at least one instance, the various features comprise the same material as the drive screw. In such instances, the various metal, for example, features can be printed onto a metal drive screw using a process called directed energy deposition, for example. In at least one instance, various features can comprise a different material that, after printed, for example, onto the drive screw, can be welded to the drive screw.
In various instances, the use of different material features on the drive screw such as flanges, for example, can provide a lower coefficient of friction between the flange and a support structure as compared to a support structure and flange both comprising a metal material, for example. Manufacturing the features after the primary portion of the drive screw is machined, for example, can also reduce the manufacturing time and cost of the entire closure drive.
In at least one instance, a drive screw shaft such as those discussed herein can be manufactured using a subtractive manufacturing process such as, for example, a Swiss screw manufacturing process, for example. Such a manufacturing process can reduce material waste and manufacturing time of the drive screw, for example. Such a manufacturing process can also allow for high precision machining of such a relatively small drive screw where diameters along the length of such a drive screw shaft may vary and comprise relatively small differences in size.
In various instances, a locking member, such as the locking member 6250, for example, comprises a rubber material and/or a low-density polyethylene and/or polypropylene, for example. The material of the locking member can be selected based on its ability to shear under load such that, under a pre-determined threshold load, the locking member may shear to prevent other part failure within the system. Such a locking member can also automatically center a drive screw shaft as the locking member is installed by being uniformly restricted therearound.
In various instances, end effector assemblies such as those disclosed herein can comprise stackable supports configured to support one more drives of the end effector assembly. For example, one or more stackable supports are configured to support a closure drive and a firing drive which are non-concentric. The one or more stackable supports are configured to support one or more drives against a common frame element such as, for example, a channel jaw.
The closure drive 6340 comprises a drive screw 6341 and a closure wedge 6342 threadably coupled to the drive screw 6341. The closure wedge 6342 is configured to be actuated proximally and distally with the drive screw 6341 to open and close a jaw opposing the channel jaw 6320 such as, for example, an anvil jaw. The firing drive 6350 comprises a drive screw 6351 comprising a proximal end 6352 and a firing member assembly 6353 configured to be threadably coupled to the drive screw 6351. The firing drive 6350 is configured to eject staples from a staple cartridge and cut tissue of a patient during a staple firing stroke as the firing member assembly 6350 is actuated along the drive screw 6351.
The closure drive 6340 and the firing drive 6350 are supported within the channel jaw 6320 by a lower support element, or mount, 6380 and an upper support element, or mount, 6370. The support elements 6370, 6380 may be stackable and support one or more elements of the closure drive 6340 and firing drive 6350. The lower support element 6380 comprises a lower portion 6381 and an upper portion 6383. The lower portion 6381 comprises a key 6382 configured to be received within a corresponding slot defined in the channel jaw 6320. Such a key and slot configuration can prevent the lower support element 6380 from moving relative to the channel jaw 6320. The upper portion 6383 comprises a shaft support 6384 comprising a lower arcuate support portion 6385 and an upper arcuate support portion 6386. The lower arcuate support portion 6385 is configured to receive an input shaft 6355 of the firing drive 6350 which is configured to couple and drive the proximal end 6352 of the drive screw 6351. The upper arcuate support portion 6386 is configured to receive and support the drive screw 6341 of the closure drive 6340.
The upper support element 6370 can be received on top of the lower support element 6380 in a track-like manner. For example, a corresponding cavity defined in the upper support element 6370 can be configured to receive the upper portion 6383 of the lower support element 6370 such that the upper support element 6370 fits and surrounds the upper portion 6383 upon installation. The upper support element 6370 further comprises a key 6371 configured to be received within a corresponding slot defined in the channel jaw 6320. The upper support element 6370 further comprises a top surface 6373 and a distal support tab 6372 configured to receive and support a portion of the drive screw 6341 therein. The top surface 6373 is configured to support a bottom surface 6343 of the closure wedge 6342 thereon. In at least one instance, a closure wedge track is defined on the top surface 6373, and the closure wedge 6342 can mate with and ride along the closure wedge track during proximal and distal travel. The upper support element 6370 further comprises a window 6374 configured to receive the upper portion 6383. Both the upper support element 6370 and the lower support element 6380 can be supported by the bottom 6321 of the channel jaw 6320.
In at least one instance, the upper and/or lower support elements 6370, 6380 can be supported within corresponding tracks defined in the channel jaw 6320 such that the upper and lower support elements 6370, 6380 are permitted a degree of longitudinal travel while still being supported by the channel jaw 6320. This can help during clamping, unclamping, and/or articulation of an end effector assembly where various drive shaft components are required to lengthen or shorten owing to the clamping, unclamping, and/or articulation motions and associated forces of the end effector assembly.
In at least one instance, the upper and/or lower support elements 6370, 6380 are manufactured from a single material into a single component. Such a configuration can be achieved using a metal machining process, for example. In at least one instance, the upper and/or lower support elements 6370, 6380 are manufactured separately. In such an instance, one of the upper and lower support elements 6370, 6380 comprises a machined component and the other of the upper and lower support elements 6370, 6380 comprises a sheet stamped component, for example. In at least one instance, both of the upper and lower support elements 6370, 6380 are stamped.
Various types of closure wedges and/or nuts are disclosed herein. The closure wedges can comprise a camming surface configured to close a jaw and one or more camming surfaces configured to open the jaw. In various instance, angles of the corresponding cam surfaces can comprise steeper angles relative to the engaging surface of the jaw which they cammingly engage. The camming surfaces can be tuned such that the drive force required from a corresponding closure drive screw is minimal while maintaining more than sufficient closure drive cam forces.
Turning now to
In at least one instance, the locking member 6520 is pinned to the attachment section 6516 in addition to or in lieu of the swaging process discussed above. In at least one instance, the locking member 6520 further comprises an annular groove and the attachment section 6516 further comprises a corresponding annular slot defined on the outside thereof configured to receive the annular groove of the locking member 6520. In at least one instance, a hole is machined in the drive screw and a dowel pin is configured to be inserted into the hole to retain a closure wedge on the drive screw.
In at least one instance, a high density polyethylene washer is positioned proximal to the locking member 6520. The high density polyethylene washer may also comprise a deformable support flange such that the washer is deformed when the locking member 6520 is assembled to the drive screw shaft 6510, for example.
In at least one instance, a deformable washer used herein comprises a grooved and/or knurled face. Such a grooved and/or knurled face can be used to compensate for tolerance stack-ups of various components within a drive system. For example, such a grooved and/or knurled face can wear slightly after a first stage of actuation after assembly so as to compensate for tolerance stack-ups.
The bailout assembly 7030 comprises bailout actuators, or cables, 7031 and a housing 7032 defining a housing cavity 7033. The bailout assembly 7030 further comprises a biasing plate 7040 and an actuator plate 7050. The actuator plate 7050 comprises a primary plate portion 7051 and a point, or pin, 7052 extending inwardly therefrom to be received and driven by the threaded section 7013 of the rotary drive shaft 7013. The pin 7052 is configured to be received within a pin slot 7028 defined in the lower portion 7024 to drivingly engage the threaded, or grooved, section 7013. The actuator plate 7050 is spring loaded against the lower portion 7024 with springs 7060 positioned within spring slots 7027 defined in the lower portion 7024. The springs 7060 are configured to bias the actuator plate 7050 out of threaded engagement with the rotary drive shaft 7010.
To hold the actuator plate 7050 in threaded engagement with the rotary drive shaft 7010, the biasing plate 7040 is positioned, or wedged, between the housing 7032 and the primary plate portion 7051 within the housing cavity 7033. This wedging engagement overcomes the spring force applied to the actuator plate 7050 by the springs 7060 and keeps the pin 7052 engaged with the threaded section 7013 of the rotary drive shaft 7010. In various instances, the firing drive assembly 7000 may become stuck or jammed within an end effector assembly due to a variety of circumstances. The bailout assembly 7030 allows for the firing member 7020 to be disengaged from the rotary drive shaft 7010 and pulled proximally independently of the rotary drive shaft 7010 to overcome a stuck or jammed scenario.
To bailout the firing drive assembly 7000, the pin 7052 is moved from an inward-most position (
In at least one instance, the firing drive assembly 7000 and end effector assembly employing the firing drive assembly 7000 may not be usable again due to the nature of the bailout assembly 7030. For example, the bailout assembly 7030 may not be able to be reset back into threaded engagement with the rotary drive shaft 7010. In at least one instance, the bailout assembly 7030 may be capable of being reset and reused. In at least one instance, another pin 7052 and corresponding structure is provided on the other side of the firing member 7020. The same, or separate, cables may be provided to actuate the other pin in such an instance.
In at least one instance, the actuators, or cables, may be controlled using a geared pulley system. In at least one instance, the cables may be motor driven. In at least one instance, the cables are manually actuatable. In at least one instance, the cables may be manually actuatable and motor driven. For example, during a power failure, the manual actuation method could be used where the motor driven system is temporarily down. In at least one instance, the cables are permitted to lengthen as the firing member is actuated so as to not prematurely actuate the bailout assembly. The cables may be passively moved or actively moved to accommodate movement of the firing member.
In various instances, surgical stapling arrangements are provided which are configured to form staples, such as traditional wire staples, differently within a single staple cartridge. More specifically, a staple cartridge may store staples with identical unformed heights, size, and shape, for example. In such an instance, different features are provided so as to form the same unformed staples into different final formed configurations. In at least one instance, the varied forming of staples varies progressively along the lateral width of the staple cartridge. More specifically, an inner row of staples may be formed into a planar, or 2D, formed configuration while an intermediate row of staples and/or an outer row of staples may be formed into a non-planar, or 3D, formed configuration. Such an arrangement can provide varied stapled tissue compression along the lateral width of the staple cartridge.
Further to the above, such surgical stapling arrangements can comprise tissue gripping features, or staple cavity extensions, defined on a deck of the staple cartridge. Such tissue gripping features can vary in shape and/or size, for example, laterally across the staple cartridge. The deck of the staple cartridge may comprise a curved surface where an apex of such a curved deck is defined at a longitudinal slot of the staple cartridge. The deck of the staple cartridge may also comprise one or more flat surfaces either providing a single flat surface in which all of the staple rows are defined or a stepped deck arrangement where various stepped portions of the deck comprise one or more corresponding staple rows defined therein.
The tissue gripping features may also be interconnected along the lateral width of the staple cartridge. For example, on each side of a longitudinal slot of the staple cartridge, the staple cartridge may comprise three rows of staple cavities and, thus, three rows of staples removably stored therein. The tissue gripping features, or deck protrusions, may be positioned around each cavity of each row; however, the tissue gripping features can be interconnected between one or more of the staple cavity rows while still varying in shape and/or size, for example. Such tissue gripping features can provide varied tissue compression along the lateral width of a staple cartridge. The varying size tissue gripping features can be advantageous when forming certain rows of staples into a non-planar, 3D configuration, and certain rows of staples into a planar, 2D configuration. Such features can be tuned specifically for the corresponding staple configuration of the staples to be formed through tissue gripped by the features. For example, gripping features configured to grip tissue to be stapled between an anvil and a row of staple cavities comprising staples configured to be formed into a non-planar configuration can comprise a first profile and gripping features configured to grip tissue to be stapled between an anvil and a row of staple cavities comprising staples configured to be formed into a planar configuration can comprise a second profile, wherein the first profile is different than second profile. In certain instances, the gripping features aligned with the rows of 3D staples can include cutouts in the areas where curved, formed legs would interfere. For example, the rows aligned with 2D staples can include full gripping features surrounding the staple cavity, and the rows aligned with the 3D staples can include gripping features with cutouts therearound to accommodate the staple legs during the 3D formation thereof.
In various instances, staples formed into a planar configuration and staples formed into a non-planar configuration may result in different formed compression heights. This can be attributed to a distance required to be traveled by legs of each staple to their corresponding staple forming pocket defined in an anvil. For example, legs of staples formed into a non-planar configuration may have to travel on a diagonal to a corresponding staple forming pocket. Without altering any other features of the stapling assembly, this distance may be farther than the distance required to be traveled by legs of staples formed into a planar configuration to a corresponding staple forming pocket.
In various instances, the distance which each leg must travel to be formed into its corresponding configuration, non-planar or planar, may be tuned by altering one or more features of a surgical stapling assembly. In at least one instance, the depths of staple forming pockets defined in the anvil are adjusted corresponding to the formed configuration of the staple to be formed thereby. In at least one instance, the unformed length of the staples are configured to be adjusted corresponding to the formed configuration of the staple to be formed thereby. In at least one instance, a corresponding driver height is adjusted corresponding to the formed configuration of the staple to be formed thereby. In at least one instance, one or more of these adjustments are combined together to accommodate 2D formed staples and 3D formed staples.
Referring to
Each pair of forming pockets of the row 8061 comprises a proximal forming pocket 8061A and a distal forming pocket 8061B. Each pair of forming pockets of the row 8063 comprises a proximal forming pocket 8063A and a distal forming pocket 8063B. Each pair of forming pockets of the row 8065 comprises a proximal forming pocket 8065A and a distal forming pocket 8065B. The forming pockets 8061A, 8061B comprise centerline axes, or longitudinal pocket axes, which are aligned with each other along the row 8061. Similarly, the forming pockets 8063A, 8063B comprise centerline axes, or longitudinal pocket axes, which are aligned with each other along the row 8063. The forming pockets 8065A, 8065B comprise centerline axes, or transverse pocket axes, which are transverse with respect to the centerline axes of the pockets 8061A, 8061B and the centerline axes of the pockets 8063A, 8063B. The centerline axes of the pockets 8065A, 8065B may be substantially parallel to each other. Further to the above, a proximal leg of one of the staples 8070 is configured to enter the proximal forming pocket 8065A and a distal leg of the staple is configured to enter the distal forming pocket 8065B. The forming pockets 8065A, 8065B are configured to direct the legs of the staple 8075 laterally away from a crown of the staple or, laterally away from each other (see
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As can be seen in
In at least one instance, the legs 8077 are formed at different angles away from the crown 8076 with respect to each other. For example, a proximal leg can be formed away from the crown at a first angle and the distal leg can be formed away from the crown in the opposite direction at a second angle. The first angle is different than the second angle. This would allow for a narrow footprint of the corresponding staple forming pockets. Moreover, when stamping these pocket shapes into the anvil, the different angles and/or narrower footprint can ensure that the wall between adjacent rows of forming pockets is sufficiently maintained, which can prevent bleeding or washout of features in one row into those in an adjacent row during the stamping process.
3D staples can be intermixed within and/or across longitudinal rows, which can maximum use of the anvil surface and further nest the pockets and allow a narrower footprint. In certain instances, intermixing of 3D staple pockets can improve tissue pressure dispersion along the anvil. In at least one instance, the 3D staple pockets can be positioned along an outermost row of pockets to further ease and/or taper the tissue pressure along the edges of the staple line farthest from the cut line.
In various instances, the gripping features 8040 and the curved deck 8021 can provide laterally varying tissue gaps. More specifically, the gap for tissue to be captured between each corresponding row of staple cavities and staple forming pockets is varied between each row. The outer-most row comprises the tallest gripping features as compared to the inner row and intermediate row. This may provide additional tissue compression in a row where the 3D staples are configured to be formed. This may provide greater stability during staple forming owing to the additional cavity extension length of the outer staple cavities. The taller gripping features can maintain a similar compression profile between the gripping features and the corresponding forming pockets; however, the portion of the deck surface 8021 that the outer row of staple cavities are defined in is further away from the anvil than the portion of the deck surface 8021 that the inner row of staple cavities and the intermediate row of staple cavities are defined in due to the lateral curvature of the deck. Collectively, the taller gripping features and the lower deck surface can provide a more stable platform for 3D formed staples in certain instances.
In various instances, flat form, or stamped, staples can be used in addition to or in lieu of wire staples. In various instances, two of the three rows of staples on each side of a cartridge are configured to be formed into a non-planar configuration while the other one of the three rows on that side of the cartridge is configured to be formed into a planar configuration. In at least one instance, the same longitudinal row of staples comprises both planar formed staples as well as non-planar formed staples. In at least one instance, the unformed height of staples within the same row is varied. In at least one instance, the unformed height of staples within different rows is varied. In at least one instance, planar staples and non-planar staples are varied along axes transverse to a longitudinal slot of a staple cartridge to spread staple pressure. In at least one instance, staple legs of non-planar formed staples are formed laterally on one side of the crown rather than opposite directions relative to the crown away from each other. In such an instance, the row gap between each row can be substantially similar at least because the legs, although forming away from the crown upon ejection, can be formed back toward the crown to tighten the staple lines. Such a configuration can help maintain a consistent lateral row gap between each row of staple forming pockets.
As discussed above, one or more adjustments can be made to vary the final formed height and/or compression height of the staples as there form can vary laterally, row-to-row, for example.
In various instances, surgical stapling assemblies are provided which are configured to overdrive staples from a staple cartridge. The amount of staple overdrive may vary from row to row. In various instances, staple drivers can comprising varying amounts of support from a corresponding staple cartridge support wall. More specifically, inner staple drivers can be supported less by a staple cartridge support wall than outer staple drivers owing to the geometry of the cartridge body and firing assembly and/or drive screw therein. In various instances, a tissue gap can be varied from row to row while maintaining a similar, or the same, driving distance between the rows.
The staple cartridge 8520 comprises a curved cartridge deck 8529 comprising a plurality of staple cavities 8522 defined therein and a plurality of tissue gripping features, or cavity extensions, 8523, 8524, 8525 extending from the cartridge deck 8529. The staple cartridge 8520 also comprises a sled 8550 comprising ramps 8551, 8552. The staple cartridge 8520 comprises a plurality of drivers 8540 sequentially aligned to eject rows of staples from the staple cavities when lifted by ramps 8551, 8552. Each driver 8540 comprises an inner row support, or inner support column, 8541 configured to support and drive a staple to be stored and ejected from an inner staple cavity 8522A, an intermediate row support, or intermediate support column, 8542 configured to support and drive a staple to be stored and ejected from an intermediate staple cavity 8522B, and an outer row support, or outer support column, 8543 configured to support and drive a staple to be stored and ejected from an outer staple cavity 8522C.
As can be seen in
As discussed herein, staple cartridges can be replaced within a surgical stapling assembly. In various instances, anvil plates are provided which can also be replaced. In such instances, the anvil plate may come with a corresponding staple cartridge such that a fresh staple cartridge and anvil plate are packaged together and are replaced within the surgical stapling assembly together. In such instances, various features of the anvil plates and corresponding staple cartridge can be tuned specifically for each other. For example, different anvil plates can comprise staple forming pockets with different patterns, staple forming pockets with different forming depths, and/or varied staple forming pocket types from row to row, for example, among other things.
A universal fitment profile can be used for a variety of anvil plates such that the stapling assembly may receive several different anvil plates. Replacing an anvil plate can also provide fresh staple forming pockets. The anvil plate and staple cartridge can be paired based on staple leg length, types of staples stored in the staple cartridge, and/or desired formed height of the staples. In such instances, an anvil jaw configured to receive the anvil plate can be manufactured with or without staple forming pockets defined directly thereon. This may reduce manufacturing costs because the anvil jaw can be reused in different scenarios rather than introducing an entirely different surgical stapling instrument with different types of forming pockets.
The second jaw 8603 comprises a replaceable anvil plate 8640 comprising an anvil surface 8641 and a plurality of forming pockets 8642 defined in the anvil surface 8641. The second jaw 8603 further comprises an upper anvil jaw portion 8630 configured to receive the replaceable anvil plate 8640 therein. In at least one instance, the replaceable anvil plate 8640 is slid into a distal end of the anvil jaw portion 8630. In at least one instance, the replaceable anvil plate 8640 is configured to be snapped into the anvil jaw portion 8630. In at least one instance, the anvil jaw portion 8630 comprises deformable arms made of a metallic material, for example, hanging from the perimeter of the anvil jaw portion 8630. The deformable arms can be configured to deform upon clamping of the jaws 8601, 8603 together after positioning the anvil plate 8640. Upon attaining a fully clamped position, the deformable arms are deformed and, in their deformed configuration, are configured to grasp and retain the anvil plate 8640 to the anvil jaw portion 8630. In at least one instance, a clampable member is configured to be clamped by the jaws 8601, 8603 to affix the anvil plate 8640 to the anvil jaw portion 8630. In such an instance, the clampable member can be responsible for deforming the deformable arms. After the anvil plate 8640 is secured to the anvil jaw portion 8630, the clampable member may be removed and discarded before the surgical stapling assembly 8600 is used. In at least one instance, the deformable members are part of the anvil plate 8630 and are configured to be secured to the anvil jaw portion 8630.
In at least one instance, an anvil cap is configured to be positioned on a distal end of the anvil jaw portion 8630. The anvil cap is configured to secure the anvil plate 8640 to the anvil jaw portion 8630. In at least one instance, the anvil plate 8640 is slid into the anvil jaw portion 8630 and, without the anvil cap, can only be removed by pulling the anvil plate 8640 distally from the distal end of the anvil jaw portion 8630. Such an anvil cap can secure the anvil plate 8640 at the distal end of the anvil jaw portion 8630. In at least one instance, the distal end of the anvil jaw portion 8630 comprises threads and the anvil cap comprises corresponding threads configured to be threaded onto the threads on the distal end of the anvil jaw portion 8630 to secure the anvil cap to the anvil jaw portion 8630. In at least one instance, the anvil cap comprises a polymer material. In at least one instance, the anvil cap is snapped onto the distal end of the anvil jaw portion 8630 and unsnapped from the distal of anvil jaw portion 8630 to replace the anvil plate 8640. In various instances, a user can install and uninstall the anvil cap. In other instances, a specific tool is required to install and/or uninstall the anvil cap from the anvil jaw portion 8630. In at least one instance, the specific tool is provided with the replaceable anvil plate 8640 and/or replaceable staple cartridge 8620. As discussed above, a replaceable anvil plate and a replaceable staple cartridge can come as a single replaceable unit to be installed within a surgical stapling assembly. In various instances, a user can mix and match anvil plates and replaceable staple cartridges to tune the type of staple line, tissue compression, and/or gripping pressure, for example, desired for a particular use. This can be based on the targeted tissue and/or type of operation, for example. For example, the one or more rows of forming pockets 8642 in certain anvil plates 8640 can include forming pockets having transverse pocket axes and configured to form 3D or non-planar staples, as further described herein, while other rows of forming pockets 8642 include forming pockets having aligned pocket axes and configured to form 2D or planar staples. Additionally or alternatively, the anvil plate can include a stepped and/or contoured surface to optimize the tissue gap for certain applications.
In various instances, a surgical end effector and or stapling assembly for a surgical device can include a rotary drive screw or rotary drive member, as further described herein. A rotary drive screw can extend through a channel and/or portion of a staple cartridge to a distal location in the end effector. The rotary drive screw can facilitate clamping and/or firing of the staple cartridge, as further described herein. The rotary drive screw can extend along a longitudinal axis and can be aligned with a centerline of the staple cartridge extending from a proximal end to a distal end thereof.
A rotary drive screw through an end effector can take up a substantial portion of the limited real estate along the longitudinal center portion of the end effector and staple cartridge thereof. In various instances, the rotary drive screw may interfere with certain existing firing components, such as the drivers and/or the sled, for example. The small footprint of the staple cartridge and the significant firing forces applied to various components in an end effector and staple cartridge can pose various challenges to structural variations and/or the relocation of certain components.
For example, the firing component(s) in a staple cartridge having a rotary drive screw therethrough need to be modified to avoid interference and provide a sufficient clearance around the rotary drive screw while withstanding the firing forces and balancing torques during the firing stroke in order to minimize damage to the components and/or misfiring of the staples. In various instances, the rows of staples can be condensed (i.e. a denser staple arrangement) and/or shifted laterally outboard away from the rotary drive screw to increase lateral space around the centerline of the staple cartridge. Relocation and/or increased density of the staple rows may require various adaptions to the firing components such as the drivers and/or the sled, for example.
In various instances, the drivers and/or the sled can be modified to correspond to the relocated and/or condensed staple rows while minimizing jams and/or incidences of misfiring. Modifications to the staple drivers may include structural and geometric variations to the staple support columns and/or bridges therebetween, for example. In certain instances, an upper portion of the driver (e.g. the widths of the staple supporting columns) can be asymmetric relative to a centerline of the driver. Additionally or alternatively, a lower portion of the driver (e.g. the bridges and/or base of the staple supporting columns) can be asymmetric relative to a centerline of the driver.
For example, in one aspect of the present disclosure, a staple cartridge can include a body extending along a longitudinal axis, rows of staples, and a triple driver configured to fire three staples simultaneously. The rows of staples can include an inner row on a first side of the longitudinal axis, wherein the inner row comprises an inner staple. The rows of staples can also include an intermediate row on the first side of the longitudinal axis, wherein the intermediate row comprises an intermediate staple. Furthermore, the rows of staples can include an outer row on the first side of the longitudinal axis, wherein the outer row comprises an outer staple. The intermediate row can be equilaterally spaced from the inner row and the outer row. The triple driver can include an inner support column defining a first width, wherein the inner support column is configured to support the inner staple. The triple driver can also include an intermediate support column defining a second width, wherein the intermediate support column is configured to support the intermediate staple. Further, the triple driver can include an outer support column defining a third width, wherein the outer support column is configured to support the outer staple. The first width can be less than the second width and less than the third width. In certain instances, the first width, the second width, and the third width can all be different.
In various aspects of the present disclosure, varied widths of the staple support columns of a multi-staple driver can be configured to provide a wider space for the sled rails while optimizing real estate for a rotary drive screw along a central longitudinal portion of the staple cartridge. Various improvements to the staple cartridge, including to the drivers and the cartridge body, for example, and advantages thereof are further described herein.
Referring now to
The staples are positioned in cavities 20110 defined in the cartridge body 20102. The staples are arranged in longitudinal rows on either side of the longitudinal axis A. For example, the cavities 20110 are arranged in cavity rows 20112. The cavity rows include an inner row 20112a, an intermediate row 20112b, and an outer row 20112c on each side of the longitudinal axis A. The intermediate row 20112b is equilaterally spaced between the inner row 20112a and the outer row 20112c. For example, the inner cavity row 20112a can be laterally spaced inward from the intermediate cavity row 20112b by a distance, and the outer cavity row 20112c can be laterally spaced outward from the intermediate cavity row 20112b by the same distance. The rotary drive screw can be aligned with the longitudinal axis A, and can extend through the cartridge body 20102 adjacent to the inner cavity rows 20112a. The rotary drive screw can be between and parallel to the inner cavity rows 20112a, for example.
The inner rows 20112a hold inner staples, the intermediate rows 20112b hold intermediate staples, and the outer rows 20112c hold outer staples. In various instances, the inner staples, the intermediate staples, and the outer staples can be identical. In other instances, the inner staples, the intermediate staples, and/or the outer staples can be each be different with respect to staple type (e.g. wire or stamped), material, and/or size (e.g. different heights), for example. The reader will appreciate that various staples, staple cavities, staple drivers, and staple cartridges are described herein. However, in certain instances, alternative fasteners can be utilized and such fasteners can be incorporated into fastener cavities, driven by fastener drivers, and/or fired from fastener cartridges which be similar to the staple cavities, staple drivers and/or staple cartridges described herein in many aspects.
The staple cartridge 20100 may have a different arrangement of staples. For example, the staple cartridge 20100 may have less than three rows of staples on each side of the longitudinal axis A and, in one aspect, may only have two rows of staples on each side of the longitudinal axis A. In still other instances, the staple cartridge 20100 can include four or more rows of staples on one or more sides of the longitudinal axis A. In various instances, the rows of staples may be asymmetrical relative to the longitudinal axis A. For example, the first side of the staple cartridge 20100 can have a different number of rows of staples than the second side of the staple cartridge 20100.
Each staple cavity 20110 includes a proximal end, a distal end, and lateral guide surfaces intermediate the proximal end and the distal end. The staple cavities 20110 are structured and dimensioned to guide drivers 20120 through the staple cavities 20110 toward the deck 20104. More specifically, the geometry of the staple cavities 20110 can complement the geometry of the drivers 20120. For example, the lateral guide surfaces in each staple cavity 20110 are configured to guide sidewalls 20134 of the driver 20120 (e.g. sidewalls of the staple-supporting columns) as the driver 20120 moves through the staple cavity 20110. Additionally or alternatively, the proximal end and/or the distal end of each staple cavity 20110 can include an upright groove configured to slidably receive an end and/or tongue thereof of the driver 20120. Alternative tongue and groove arrangements are also contemplated, which can be configured to guide the drivers 20120 through the staple cavities 20110 during firing of the staples from the staple cartridge 20100.
The drivers 20120 are configured to support and drive multiple staples from the cartridge body 20102 during a firing stroke. The drivers 20120 can movably support staples spanning two or more longitudinal rows of staple cavities 20112. For example, the drivers 20120 can movably support an inner staple, an intermediate staple, and an outer staple on the same side of the staple cartridge 20100.
Referring primarily now to
The driver 20120 also includes bridges 20126 extending between adjacent support columns 20122. For example, a first bridge 20126a extends between the inner support column 20122a and the intermediate support column 20122b, and a second bridge 20126b extends between the intermediate support column 20122b and the outer support column 20122c. The bridges 20126a, 20126b each include a ramped underside 20128 configured to be drivingly engaged by a sled during a firing stroke. Stated differently, each driver 20120 is configured to be engaged and lifted by two parallel sled rails along the ramped undersides 20128 of the driver 20120. For example, a sled can be configured to move along a firing path during a firing stroke. The sled can comprise a central portion aligned with the longitudinal axis A, a first rail on a first side of the longitudinal axis A that is configured to driving engage the ramped underside 20128 of the first bridge 20126a, and a second rail on a second side of the longitudinal axis A that is configured to drivingly engage the ramped underside 20128 of the second bridge 20126b. Sleds and firing motions thereof are further described herein.
Each support column 20122 includes a proximal end 20130, a distal end 20132, and a pair of opposing sidewalls 20134 extending longitudinally between the proximal end 20130 and the distal end 20132. The sidewalls 20134 are configured to slidably engage the lateral guide surfaces in the respective staple cavity 20110 during a firing motion. Each support column 20122 includes a staple-supporting cradle 20124. A base of the staple can be held in the staple-supporting cradle 20124.
The staple-supporting cradles 20124 are each aligned with one of an inner axis A1, an intermediate axis A2, or an outer axis A3, which correspond to the axes defining the longitudinal rows of staples and staple cavities 20110 on one side of the staple cartridge 20100. A first lateral distance D1 is defined between the inner axis A1 and the intermediate axis A2, and a second lateral distance D2 is defined between the outer axis A3 and the intermediate axis A2. The axes are equilaterally spaced; the first lateral distance D1 and the second lateral distance D2 are the same. Though the lateral distances D1, D2 between the axes and adjacent rows of staple cavities 20110 are the same, the driver 20120 is asymmetrical relative to a centerline of the driver 20120. For example, the centerline of the driver 20120 corresponds to the intermediate axis A2 and the inner and outer staples are positioned equidistant from intermediate axis A2; however, the driver 20120 is not symmetrical about the intermediate axis A2.
Referring primarily to
The widths Wa, Wb, and Wc are all different. For example, the width Wb of the intermediate support column 20122b is greater than the width Wa of the inner support column 20122a and the width Wc of the outer support column 20122c. The width Wc is less than the width Wb of the intermediate support column 20122b and greater than the width Wa of the inner support column 20122a. The differing widths Wa, Wb, and Wc are configured to optimize the width of the driver 20120 to accommodate a rotary drive screw along the longitudinal axis A, while effectively transferring the firing force and minimizing torque and mis-firings, for example.
As provided herein, in certain instances, the width of the staple support columns on the drivers can be varied to accommodate a rotary drive screw positioned in the staple cartridge. Additionally or alternatively, in certain aspects of the present disclosure, the lower portions of a driver can also vary laterally and the lower portion (e.g. the lower portion of the support columns and/or the bridges) may be asymmetric relative to a centerline through the intermediate support column. For example, a lower portion of the drivers can be improved to increase the available real estate in a longitudinal center portion of the staple cartridge. An asymmetric geometry for the lower portion of the drivers can be selected to improve the strength and stiffness of the triple driver while minimizing the height of the driver. In various instances, though the support column thickness and/or bridge geometry can vary laterally, the support columns can be equally spaced from a centroid of the substantially triangular triple driver. For example, the intermediate support column can be longitudinally aligned with the centroid, and the inner and outer support columns can be longitudinally offset from the centroid. In various instances, the ramped surfaces can be equilaterally spaced from the centroid of the triple driver.
Referring to
The end effector 20240 includes a rotary drive screw 20242 and a firing member 20244, which are similar to the firing screw 261 (
The driver 20220 includes an inner support column 20222a, an intermediate support column 20222b, and an outer support column 20222c. The columns 20222 comprise different widths, as further described herein. In various aspects of the present disclosure, one or more of the columns 20222 can also include a different height than the other columns. In various instances, the different heights are configured to form staples to varying heights, which can correspond to the contour of a laterally-curved tissue-support surface or deck of the cartridge body, for example.
The lower portion of the driver 20220 includes a chamfered inner edge 20236. The chamfered inner edge 20236 is a cutaway or scalloped edge dimensioned to accommodate the drive screw 20242 and a lower portion of the firing member 20244. For example, the drive screw 20242 extends along the longitudinal axis A and is positioned between the drivers 20220 on opposite sides of the longitudinal axis A. In such instances, the drive screw 20242 can extend through the staple cartridge 20200 while minimizing the dimensions of staple cartridge 20200 and end effector 20240. The chamfered inner edge 20236 comprises a cutaway into a base portion of the inner support column 20222a, which provides a clearance for the firing components positioned along the longitudinal center portion of the end effector 20240. Moreover, the chamfered inner edge 20236 is configured to provide a space closer to a vertical centerline of the of the end effector, i.e. equidistance between the upper cam and the lower cam, which can improve and/or help to balance the forces during the firing stroke.
Additionally or alternatively, the bridges of a driver can vary laterally and/or be asymmetric relative to a centerline through the intermediate support column of the driver. Referring now to
The end effector 20340 can include a rotary drive screw and a firing member, as further described herein, the firing member moves through the staple cartridge 20300 during a firing stroke to advance a sled 20350 having rails 20352 to lift the driver 20320. The driver 20320 includes an inner support column 20322a, an intermediate support column 20322b, and an outer support column 20322c. The columns 20322 comprise different widths, as further described herein. In various aspects of the present disclosure, one or more of the columns 20322 can also include a different height than the other columns, as further described herein.
The lower portion of the driver 20320 includes a chamfered inner edge 20336, which is similar in many aspects to the chamfered edge 20236 (
The first bridge 20326a is taller than the second bridge 20326b. In various instances, as further described herein, a central longitudinal portion of the staple cartridge 20300 can be taller and define a greater height at a peak of the laterally-curved tissue support surface than along the sides of the staple cartridge 20300. As a result, the staple cartridge 20300 can accommodate additional material and/or increased height/volume of the driver 20320 between the inner support column 20322a and the intermediate support column 20322b than between the outer support column 20322c and the intermediate support column 20322b. The increased height of the first bridge 20326a from the base surface compared to the second bridge 20326b can compensate for rigidity losses resulting from the chamfered inner edge 20336, for example. Additionally or alternatively, the greater height of the first bridge 20326a compared to the second bridge 20326b can improve the stiffness and strength of the triple driver 20320, while minimizing the dimensions and maintaining a compact form factor for the staple cartridge 20300 and the end effector 20340.
In certain instances, an upper portion of the first bridge 20326a can be configured to guide the driver 20320 through the staple cavities during an initial portion of the firing motion through the staple cavities. For example, when the inner support column 20322a is in an unfired position, the inner support column 20322a may be at least partially unsupported or unguided by lateral guide surfaces because of cutouts in a central portion of the cartridge body assembly 20300 to accommodate the rotary drive screw. In the absence of certain lateral support surfaces around the inner support column 20322a, the driver 20320 may be prone to torque and/or misfiring. However, the increased height of the first bridge 20326a can be configured to engage an upright support surface in the cartridge body during an initial portion of the firing motion to improve the guidance and support of the driver 20320.
Referring now to
The driver 20420 includes an inner support column 20422a, an intermediate support column 20422b, and an outer support column 20422c. The columns 20422 comprise different widths, as further described herein. In various aspects of the present disclosure, one or more of the support columns 20422 can also include a different height than the other support columns, as further described herein.
The lower portion of the driver 20420 includes a chamfered inner edge 20436, which is similar in many aspects to the chamfered edge 20236 (
In various instances, a tallest height of the variable height deck and the staple cartridge can be adjacent to the rotary drive screw 20442. In such instances, a tighter tissue gap can be defined along the firing bar and cutting edge. The portion of the variable height deck overlaying the inner support column 20422a and/or first bridge 20426a can define the greatest height and, thus, in certain aspects, can fit the heightened first bridge 20426a and/or the gusset 20438 intermediate the first bridge 20426a and the inner support column 20422a.
In certain instances, one or more gusset plates can extend between an upper edge of the first bridge 20426a and the inner support column 20424. In certain instances, the gusset 20438 can comprise a longitudinal gusset rib along at least a portion of the length of the inner support column 20422a and the first bridge 20426a. The driver 20420 is asymmetric relative to a vertical plane P (
In certain instances, to accommodate a rotary drive screw along a central portion of the staple cartridge, a portion of the cartridge body can be cutaway. The cartridge body can include additional guides and support features configured to guide the driver through the staple cavity and toward the deck of the cartridge body. The guides can be configured to engage and support the driver even when a portion the driver is not fully seated within the staple cavity.
Referring to
Referring primarily to
Referring also to
Referring now to
The driver 20630 further includes proximal and distal upright features 20636, 20638 or extensions, which extend away from the base of the driver 20630 and away from the staple-supporting cradle 20624. The proximal upright feature 20636 is a proximal-most feature of the support column 20622 and extends from the proximal end 20630 of the support column 20622. The distal upright feature 20638 is a distal-most feature of the support column 20622 and extends from the distal end 20636 of the support column 20622. In the driver's unfired position, the proximal and distal upright features 20636, 20638 can be below the deck of the staple cartridge and extend toward the deck. The proximal and distal upright features 20636, 20638 can be configured to support the staple 20680 and guide the staple legs during formation, for example.
The proximal and distal upright features 20636, 20638 are the tallest portions of the support column 20622. In certain instances, when the driver is moved to the fired position, the proximal and distal upright features 20636, 20638 can extend above the deck and facilitate gripping and/or holding of tissue adjacent to the staples 20860. For example, the proximal and distal upright features 20636, 20638 can grip tissue at the proximal end and the distal end of the staple cavity. Moreover, the proximal and distal upright features 20636, 20638 can act as guide surfaces for the driver 20630 and can guide the support column 20632 into the fastener cavity in certain instances. For example, when the support column 20622 is not fully seated in the staple cavity prior to firing, as further described herein, the proximal and distal upright features 20636, 20638 are configured to guide the support column 20622 into alignment with the staple cavity during the firing motion.
In certain instances, the proximal and distal upright features 20636, 20638 may be incorporated into an inner support column (i.e. the support column adjacent to a firing path and/or rotary drive screw). In such instances, the proximal and distal upright features 20636, 20638 can engage the staple cavity during the firing stroke and are configured to guide the inner support column even if the inner support column is not fully seated in the staple cavity prior to firing, as further described herein. In other instances, the intermediate support column and/or the outer support column can also include at least one of a proximal upright feature 20636 and/or a distal upright feature 20638.
In certain aspects of the present disclosure, the proximal and distal upright features 20636, 20638 are configured to be received into recesses along an underside of the tissue-supporting deck when the driver 20620 is in the fully advanced position. As further described herein, the underside of the tissue-supporting deck can include an array of recesses that fit within the pocket extenders on the anvil-facing side of the deck. Pocket extenders can surround or at least partially surround the openings in the tissue-supporting deck to grip tissue and/or guide the staple legs during the firing stroke. The nesting of features on the driver with underside recesses in the tissue-supporting deck is further described herein. Nesting of the proximal and distal upright features in the pocket extenders or ridges of the cartridge deck can maintain the desired tissue gap and deck thickness in various instances.
In certain instances, a replaceable staple cartridge can be used with each firing stroke and then replaced with another replaceable staple cartridge for a subsequent firing stroke. The replaceable staple cartridge can include a cartridge body, drivers, staples, and a sled, as further described herein. Reusable, multi-fire cutting edges can be incorporated into the end effector and advanced relative to the replaceable staple cartridge in certain instances. For example, an end effector can include a firing member, such as an I-beam or an E-beam, for example, having a distal-facing upright cutting edge along a leading edge thereof. Exemplary firing members having a reusable cutting edge for use during multiple firing strokes are further described herein. In certain instances, reusable knives and the cutting edge(s) thereof can be a hardened part, which may be expensive to manufacture. In certain instances, the placement of a reusable knife in a surgical device may limit the number of times the surgical device can be reused. Moreover, to resist dulling of the knife with multiple firings, a reusable knife may not be as sharp as a single-use knife in certain instances.
In other instances, a firing member, end effector, and/or surgical device may not include a multi-fire tissue-transecting knife. Instead of being incorporated into the surgical device itself, for example, a knife can be incorporated into a replaceable staple cartridge, for example. In such instances, a fresh cutting edge can be used with each firing stroke.
Various replaceable staple cartridge assemblies having a tissue-transecting knife are described herein. In one instance, the firing member can include an integral sled component and the knife can be releasably attached or mounted to the firing member upon insertion of the staple cartridge into the surgical device or end effector thereof having the firing member.
Referring now to
Referring primarily to
Referring still to
Referring primarily to
Parallel longitudinal slots 20803 (
In other instances, the integral sled of a firing member 20841 can more than one rail on each side. For example, integrated sleds having four rails and six rails are also contemplated.
The firing member 20841 is adapted to releasably connect to the knife 20830. The knife 20830 includes opposing spring arms 20832, which extend proximally toward the upright body portion 20843 of the firing member 20841 and resiliently engage the upright body portion 20843. The spring arms 20832 snap around the upright body portion 20843 and extend into a cavity 20846 defined into the upright body portion 20843. The knife 20830 also includes a longitudinal body 20834, which is configured to rest and/or nest on a complementary surface on the firing member 20841 over the threaded opening 20847 for the rotary drive screw 20842, for example. The knife 20830 further includes an upright cutting edge 20836, which is configured to extend above a tissue-supporting deck 20804 (
In various instances, the fastener cartridge 20800 and the cartridge jaw 20850 can include alignment and/or leveraging features for facilitating installation of the fastener cartridge 20800 into the cartridge jaw 20850. Various alignment and leveraging features are further described herein. These features can also align the knife 20830 with the firing member 20841 and, more specifically, align the spring arms 20832 with the cavity 20846, to ensure the knife 20830 is connected to the firing member 20841 upon insertion of the staple cartridge 20800 into the cartridge jaw 20850.
In the unfired staple cartridge 20800, the knife 20830 is aligned with the indicator sled 20828, which is configured to be pushed distally by the knife 20830 during the firing stroke. As further described herein, the indicator sled 20828 provides a visible indication to a clinician and/or user when a firing stroke has been completed by moving into a window 20806 (
The indicator sled 20828 and the knife 20830 are components of the staple cartridge 20800. When the staple cartridge 20800 is installed in the surgical end effector 20840, the knife 20830 is brought into alignment with the firing member 20841 such that the spring arms 20832 resiliently engage the opening 20846. The insertion angle of the staple cartridge 20800 is configured to ensure the proper alignment of the spring arms 20832 and the opening 20846. In such instances, a fresh knife can be provided with each staple cartridge 20800 and for each firing stroke.
Referring primarily to
The triple drivers 20820 are lifted by a single sled rail 20862 on each side of the staple cartridge 20800. Each triple driver 20820 includes a recessed ramp 20818 (
The triple driver 20820 can be similar to the triple driver 20120 (
The triple driver 20820 also includes bridges 20826 extending between adjacent support columns 20822. For example, a first bridge 20826a extends between the inner support column 20822a and the intermediate support column 20822b, and a second bridge 20826b extends between the intermediate support column 20822b and the outer support column 20822c. The recessed ramp 20818, which is aligned with the drive rail 20866, is positioned between the first bridge 20826a and the second bridge 20826b and proximal to the intermediate support column 20822b.
More specifically, the recessed ramp 20818 is longitudinally aligned with the intermediate support column 20822b. Consequently, the intermediate support columns 20822b of the drivers 28020 are positioned in the parallel longitudinal slots 20803 through the cartridge body 20802 and are unsupported, or at least unsupported along a lower portion thereof, by the cartridge body 20802 when in the unfired positions in the cartridge body 20802. In such instances, the staple 20890 in the intermediate row of staples on each side of the cartridge body is supported by the intermediate support column 20822b and guided largely by a tissue-supporting deck 20804 of the cartridge body 20802. In certain instances, pocket extenders and/or ridges along the tissue-supporting deck 20804 can further guide the staples 20890 during the firing stroke.
The triple driver 20820 can be symmetrical about a longitudinal axis along the recessed ramp 20818. In various instances, the triple driver 20820 can include wings 20824, which extend laterally outward on both sides of the intermediate support column 20822b. The wings 20824 are configured to prevent driver roll and to strengthen the intermediate support column 20822b, in certain instances. For example, the wings 20824 can help balance the intermediate support column 20822b during the firing stroke when the intermediate support column 20822b is unsupported, or largely unsupported, by the cartridge body 20802.
Referring primarily to
Referring still to
In short, the staple cartridge 20800 can include triple drivers 20820 which are configured to be lifted by a single sled rail 20866 that pushes on a center portion and ramped recess 20818 of the triple driver 20820 during a firing stroke. The triple drivers 20820 can further includes wings 20824 on both sides, which prevent roll of the triple driver 20820 during the firing stroke. The wings 20824 can move in corresponding slots in the cartridge body 20802. In certain instances, the sled 20860 can be integrally-formed with the firing member 20841 (e.g. an I-beam or E-beam). In such instances, the sled 20860 can be a reusable component along with the firing member 20842; however, a fresh knife 20830 can be provided with each staple cartridge 20800. In other instances, the sled can be a discrete component in the staple cartridge and, in certain instances, the firing member 20841 can include an integral cutting edge.
In various instances, triple drivers and a firing member with an integral two-rail sled, as described herein, can allow the triple driver to be narrower and, thus, allow more space in the cartridge body for a rotary drive screw. For example, the rotary drive screw can be positioned farther upward in the end effector closer to the upper cam of the firing member, rather than along the lowest portion of the end effector. Narrower drivers can provide a tighter staple line, for example, which may also improve homeostasis in certain instances. Additionally, the inner rows of staples can be moved laterally outward to accommodate the rotary drive screw, which may reduce the likelihood and/or incidences of staple tear out. Moreover, the cartridge body can provide a robust design without narrower support columns, towers, and/or thin sidewalls between the staple cavities and/or the longitudinal slot for the firing member. The sled rails can also be wider in certain instances and, thus, may be less prone to bending under substantial firing loads. In certain instances, the staple overdrive can be minimized when bending and flexing of the sled rails is limited.
Referring primarily to
Effecting a firing stroke when a staple cartridge is missing from the surgical end effector can result in a knife transecting the clamped tissue without any means for sealing the transection. For example, without staples, such as staples, for example, a stapling device cannot staple and seal the cut tissue. Similarly, if an empty or spent staple cartridge is loaded in the end effector, i.e. a staple cartridge without staples or without a full set of staples, the tissue also would not be fully sealed along the transection. A missing cartridge lockout can prevent a firing stroke when a staple cartridge is missing from the end effector and a spent cartridge lockout can prevent a firing stroke when a spent staple cartridge is loaded in the end effector. In certain instances, a lockout can prevent a firing stroke when the staple cartridge is missing and spent. In instances in which a rotary firing screw extends through the end effector, the lockout can be configured to limit and/or prevent rotation of the rotary firing screw and, thus, to prevent the firing stroke.
In one aspect, a lock nut can be positioned on the rotary drive screw and a lockout key can be incorporated into a movable feature in the staple cartridge. In the locked configuration, the lock nut rotates out of firing alignment and into a lockout notch in the end effector. Upon installing an unfired staple cartridge in the end effector, the lockout key engages the lock nut to rotate it into firing alignment and out of the lockout notch. The lock nut moves distally along the rotary drive screw during the firing stroke and the lockout key is also pushed distally during the firing stroke. The lockout key can remain in a distal position upon completion of the firing stroke and/or retraction of the firing member; however, the lock nut can return to a proximal position in the end effector. Because the staple cartridge has been fired (e.g. spent), the lock nut again rotates out of firing alignment and into the lockout notch to prevent a subsequent firing stroke until a replacement unfired staple cartridge is installed in the end effector. In other instances, a lock on the rotary drive screw may not be threadably engaged with the rotary drive screw and a spring can bias the lock into a lockout notch to selectively prevent a firing stroke.
Such a lockout arrangement can be configured to prevent a firing stroke when a staple cartridge is missing and/or when the staple cartridge in the end effector has been spent/fired. Moreover, these arrangements can take up a minimal amount of space in the end effector. Moreover, the components can be simple and robust. In the instances of a lock nut threadably coupled to the rotary drive screw, only a single additional component in the end effector is needed for the lockout configuration. In various instances, the lockout key can provide a visual indication to a clinician that the staple cartridge has already been fired.
Referring now to
More specifically, the cartridge jaw 21850 includes a bottom side 21856 and sidewalls 21852 forming a channel that is dimensioned and structured to receive the staple cartridge 20800 therein. The lockout notch 21854 comprises a lateral recess or opening in a proximal portion of the bottom side 21856. The lockout notch 21854 is aligned with a lockout nut 21874 threadably coupled to the rotary drive screw 20842 when the rotary drive screw 20842 and lockout nut 21874 thereon are in an unfired or proximal position.
The lock nut 21870 includes a central threaded aperture through a body portion, opposing flanges 21874, and a lug 21872. The flanges 21874 and the lug 21872 extend radially outward from the body portion. In an unlocked position (
The lock nut 21870 is threadably coupled to the rotary drive screw 20842. A rotation of the rotary drive screw 20842 can rotate the lock nut 21870 therewith unless the rotation of the lock nut 21870 is prevented or blocked. Initially, when the end effector 21840 is without a staple cartridge therein (
Referring primarily to
The lockout key 20828 also defines a contoured profile 20829 that corresponds to a contoured profile track 20807 in the cartridge body 20802. The contoured profile track 20807 is configured to resist rotation of the lockout key 20828 as the lockout key 20828 is pushed distally. In various instances, the foot 20827 forms a nook into which the lug 21872 is received. The foot 20827 rotates the lug 20872 into the unlocked position. Subsequently, during a firing stroke, the lug 21872 can remain engaged with the nook in the lockout key 20828 and can push the lockout key 20828 distally through the contoured profile track 20807. The firing force can be sufficient to overcome the detent 20809 holding the foot 20827 in a proximal position the cartridge body 20802.
Additionally or alternatively, the knife 20830 can push the lockout key 20828 distally through the cartridge body 20802. The knife 20830 also comprises a contoured profile, which is configured to travel through the contoured profile track 20807 without rotating out of firing alignment during the firing stroke.
Referring now to
Reversing rotary motion of the rotary drive screw 20842 is configured to retract the firing member 20841. As further described herein, the knife 20830 can be retracted along with the firing member 20841 in various instances. However, the lockout key 21828 can be released from the knife 20830 and can remain at the distal position in the cartridge body 20802. Referring primarily to
In the locked position, the lockout nut 21870 cannot rotate relative to the rotary drive screw 20842 and cannot translate longitudinally through the end effector 21840. As a result, rotary motion of the rotary drive screw 20842 is resisted and the firing stroke is prevented until the lockout nut 21870 assumes the unlocked position.
The lockout arrangement 21868 described herein with respect to
The lockout arrangement 22868 includes a lock 22870, which is similar in many aspects to the lockout nut 21870; however, the lock 22870 is not threadably coupled to the rotary drive screw 20842. The lock 22870 includes central non-threaded aperture through a body portion, opposing flanges 22874, and a lug 22872. The flanges 22874 and the lug 22872 extend radially outward from the body portion.
In an unlocked position, the flanges 22874 extend laterally outward to an inside surface of the bottom side 22856 of the cartridge channel 22850 and are positioned to ride along and/or adjacent to the inside surface. The flanges 22874 are received in the holes 22868 in the sled 22860. For example, the holes 22868 are through-holes in the sled rails 20866 that are dimensioned and positioned to receive the opposing flanges 22874 when the lock 22870 is in the unlocked position. As a result, the firing member 22841 and sled rails 22868 thereof are configured to pull the lock 22870 along the rotary drive screw 20842 during the firing stroke. Moreover, in the unlocked positioned, the lug 22872 is aligned with the upright body portion of the firing member 22841.
In the locked position (
The lockout arrangement 22868 also includes a spring 22870, which is configured to bias the lock 22870 into the lockout notch 22854. The lockout arrangement 22868 can function like the lockout arrangement 21868; however, the spring 22870 can bias the lock 22870 into the lockout notch 22854 such that the lockout arrangement 22868 is always locked unless an unfired staple cartridge 20800 is loaded into the end effector 22840 and the lockout key 21828 thereof temporarily overcomes the lockout arrangement 22868 until the completion of the firing stroke. As described above with respect to the lockout arrangement 21868, the lockout key 21828 is configured to move through the window 20806 in the cartridge body 20802 at the completion of the firing stroke to communicate the completion of a firing stroke and that the staple cartridge has been fired/spent.
The formed staple height is a function of the space between the staple-supporting surface and the staple-forming surface. More specifically, a vertical space between (A) a staple-supporting cradle on a driver in a fired position and (B) a staple-forming pocket surface in an anvil in the clamped position controls the formed height of the staples. Different formed staple heights are selected for different surgical procedures and/or different tissue types, for example. When a staple cartridge includes a rotary firing screw therethrough, the arrangement of staples and corresponding staple cavities and drivers can be altered to accommodate the rotary firing screw. For example, the drivers can include at least one asymmetry, as further described herein. Additionally or alternatively, the drivers can be narrower and, thus, need additional support and/or strength. Moreover, in various instances, it is desirable to optimize a tissue gap while maintaining a desired formed staple height. For example, the tissue gap between the tissue-supporting deck surface and the anvil can be maximized when the end effector is in a closed configuration while the desired formed staple height is maintained.
In various instances, an underside of the tissue-supporting deck can include a contoured and/or rutted surface, which is configured to receive one or more portions of the drivers when the drivers are in their fully fired and/or overdriven positions. The interlocking and/or nesting between the underside of the tissue-supporting deck and the tissue-facing side of the drivers can maximize the tissue gap while still maintaining a desired formed staple height. Moreover, the interlocking features can improve the strength of the drivers in various instances.
In one example, a staple cartridge can include a body comprising a tissue-supporting deck, wherein staple cavities are defined through the tissue-supporting deck in the body, and wherein the tissue-supporting deck includes a tissue-facing side comprising a bumpy or ridged surface. The tissue-support deck further includes an underside opposite the tissue-facing side, wherein the underside comprises a rutted surface. Staples can be removably positioned in the staple cavities. Drivers can movably support the staples and be configured to move through a portion of the staple cavities to fired positions to eject the staples from the staple cavities. Each driver can include a base housed in the staple cartridge and comprising surface contours configured to mate with the rutted surface on the underside of the tissue-supporting deck when moved to the fired position.
Referring now to
The cartridge body 22102 also includes an array of pocket extenders or ridges 22114 extending from the tissue supporting deck 22104. The ridges 22114 extend around a perimeter or opening formed in the tissue supporting deck 22104 for a staple cavity. The ridges 22114 can be configured to grip and engage tissue positioned between the staple cartridge 22100 and an opposing anvil. In various instances, the ridges 22114 can limit and/or constrain tissue flow, for example. Additionally or alternatively, the ridges 22114 can be configured to guide the legs of the staples as they enter tissue and are directed into engagement with respective forming pockets on the staple-forming surface of the anvil. The ridges 22114 can extend around the proximal and distal ends of the staple cavities, for example. Proximally- and distally-positioned projections or pocket extensions can prevent outwardly-biased staple legs (of V-shaped staples, for example) from flaring outwardly and missing the target location in the forming pocket aligned therewith.
In certain aspects, adjacent ridges 22114 can be connected. For example, the ridges 22114 can be interconnected with respect to longitudinally-offset staple cavities and/or laterally-offset staple cavities.
In various instances, an array of laterally-offset ridges 22114 can define different heights. In various instances, the ridges 22114 can define different heights laterally along the width of the cartridge body 22102. Different heights can correspond to the lateral curve of the tissue supporting deck 22104 and/or different lengths for guiding the staples beyond the tissue-supporting deck 22104 and/or different tissue gaps when the end effector is clamped, for example. With respect to the cartridge body 22102, the ridges 22114 span three laterally-spaced rows of staple cavities 22112a, 22112b, 22112c and the ridges 22114 aligned with outer row 22112c are taller than the inner rows 22112a, 22112b and, thus, would guide the staple legs over a greater distance. However, the tissue gap is also larger over the outer rows 22112c than the inner rows 22112a, 22112b owing to the lateral curve of the tissue-supporting deck 22104 and the non-stepped/non-contoured tissue-clamping surface of the anvil.
The staples are positioned in cavities defined in the cartridge body 22102, similar to the cavities 20110 (
The inner rows 22112a hold inner staples, the intermediate rows 22112b hold intermediate staples, and the outer rows 22112c hold outer staples. In various instances, the inner staples, the intermediate staples, and the outer staples can be identical. In other instances, the inner staples, the intermediate staples, and/or the outer staples can each be different with respect to staple type (e.g. wire or stamped), material, and/or size (e.g. different heights), for example.
In other instances, the staple cartridge 22100 may have a different arrangement of staples. For example, the staple cartridge 22100 may have less than three rows of staples on each side of the longitudinal axis A. In one aspect of the present disclosure, the staple cartridge 22100 may only have two rows of staples on each side of the longitudinal axis A. In still other instances, the staple cartridge 22100 can include four or more rows of staples on one or more sides of the longitudinal axis A. In various instances, the rows of staples may be asymmetrical relative to the longitudinal axis A. For example, the first side of the staple cartridge 22100 can have a different number of rows of staples than the second side of the staple cartridge 22100.
The staple cavities in the cartridge body 22102 can each include a proximal end, a distal end, and lateral guide surfaces intermediate the proximal end and the distal end. The staple cavities are structured and dimensioned to guide drivers 22120 through the staple cavities toward the deck 22104. Referring primarily to
The geometry of the staple cavities can complement the geometry of the drivers 22120. For example, lateral guide surfaces in each staple cavity are configured to guide sidewalls 22134 of the driver 22120 as the driver 22120 moves through the staple cavity. Additionally or alternatively, the proximal end and/or the distal end of each staple cavity can include an upright groove configured to slidably receive an end and/or tongue thereof of the driver 22120. Alternative tongue and groove arrangements are also contemplated, which can be configured to guide the drivers 22120 through the staple cavities during firing of the staples from the staple cartridge 22100.
The drivers 22120 are configured to support and drive multiple staples from the cartridge body 22102 during a firing stroke. The drivers 22120 can movably support staples spanning two or more longitudinal rows 22112. For example, the drivers 22120 can movably support an inner staple, an intermediate staple, and an outer staple on the same side of the staple cartridge 22100.
The driver 22120 is a triple driver, which is configured to drive three staples simultaneously. The driver 22120 includes three support columns—an inner support column 22122a configured to support an inner staple in an inner row of staples, an intermediate support column 22122b laterally outboard of the inner support column 22122a configured to support an intermediate staple in an intermediate row of staples, and an outer support column 22122c laterally outboard of the intermediate support column 22122b and configured to support an outer staple in an outer row of staples.
The driver 22120 also includes bridges 22126 extending between adjacent support columns 22122. For example, a first bridge 22126a extends between the inner support column 22122a and the intermediate support column 22122b, and a second bridge 22126b extends between the intermediate support column 22122b and the outer support column 22122c. The bridges 22126a, 22126b each include a ramped underside 22128 configured to be drivingly engaged by a sled during a firing stroke. For example, a sled 22150 (
Referring primarily to
The drivers 22120 are configured to mate or nest with the rutted underside 22116 when the drivers 22120 are move to the fired positions. Referring again primarily to
The top surface of the bridges 22126a and 22126b are symmetric relative to a longitudinal centerline of the respective bridge 22126a, 22126b. The centerline of each bridge 22126a, 22126b can be equidistant between the longitudinal axes defined by staple-supporting cradles 22124 of adjacent support columns 22122. The projections 22130 are symmetric relative to the longitudinal centerline of the respective bridge 22126a, 22126b.
In other instances, the drivers, the bridges thereof, and/or the top surfaces thereof, can be laterally asymmetric, as further described herein. Referring to a driver 22220 in
The top surface 22230 of each bridge 22226a, 22226b includes a laterally-sloped top surface, which is configured to complement a portion of the contoured underside of a tissue-supporting deck, such as the rutted underside 22116 (
An anvil 22370 for a surgical end effector is shown in
The space d between a proximal pocket 22372a and a distal pocket 22372b in a pair of staple-forming pockets 22372 can be minimized in certain instances to maximize the longitudinal forming length of the staples. Generally, staples are over-bent during the forming process to compensate for staple spring-back. However, over-bending of staples can be reduced when the forming pockets are shorter and, thus, steeper in certain instances. Shorter and steeper staple pockets, which define a larger space or gap d between the proximal pocket 22372a and the distal pocket 22372b in a pair of staple-forming pockets 22372, can reduce spring-back. Shorter and steeper staple pockets can curve the staple legs more and deform the staples more plastically to reduce spring-back, for example. Moreover, shorter and steeper staple pockets can improve sequential staple leg bends in certain instances. Referring to the space d in
For example, in an end effector, the staples and/or the drivers can vary from row-to-row. In certain instances, the staples can be shorter, comprise a different wire diameter, be lifted by a driver having a different height and/or a different amount of overdrive. In certain instances, shorter staple forming pockets, as described above, can be utilized with the one row of staples and not an adjacent row of staples in the same anvil. For example, shorter staples can utilize the shortened pockets to improve sequential staple leg bends, e.g. two sequential bends on each staple leg to assume a B-shape. In still other instances, staples along an inside row of staples, i.e. adjacent to a longitudinal knife path, can utilize the shortened pockets to bend the staples more plastically and reduce spring-back to form a tighter row. In these instances, the distance d in
A staple cartridge, such as the staple cartridge 20100 (
For example, portion of the drivers can nest in recesses in the underside of the tissue-supporting deck in certain instances to reduce certain minimize size limitations. In various instances, to ensure the tissue-supporting deck maintains an appropriate height, the recesses can be aligned with localized regions along the tissue-supporting deck with an increased height, such as below pocket extenders/tissue-gripping ridges, for example. In other instances, one or more additional recesses in the underside of the tissue-supporting deck can be configured to receive a portion of the driver and/or bridge thereof. Exemplary staggering of interlocking features between the inner surfaces of the staple cartridge and the drivers is shown in
To reduce vertical stack-up dimensions of multiple components, the tissue-supporting deck of a staple cartridge, such as the staple cartridge 20100 (
Additionally, the staple cartridges such as the staple cartridge 20100 (
For example, vertically-expandable drivers can be configured to reduce resting or unfired heights of the drivers within the staple cartridge. The drivers can be telescoping and can define a height that is approximately 50% of its final height when in the unfired position. In such instances, the staples can sit lower in the cartridge body prior to firing. In certain instances, a first part of the sled rail can activate the driver by overcoming a significant snap feature with the body of the driver and expanding it to its final height. Then, a second part of the sled rail can complete the firing of the driver to eject the staple(s) supported thereon out of the cartridge body. The first of the sled rail can be narrower than the second part of the sled rail.
Additionally or alternatively, the tissue-supporting deck can comprise a variable-height, injection molded deck, which can compress when a predefined tissue load is applied to increase the tissue gap. As the sled fires the drivers and staples, the sled and/or the drivers can locally push the deck back into the tissue to an increased height momentarily in order to temporarily decrease the tissue gap. The tissue-support deck can then relax or otherwise return to the compressed state corresponding to an increased tissue gap after the sled has passed.
For example, the cartridge body or tissue-supporting deck thereof can include selectively positioned wall segments, which can be thin and configured to buckle under the predefined tissue load while still maintaining appropriate alignment between the staples and the staple-forming pockets in the anvil. In certain instances, an electrically-actuated material (e.g. electroactive polymers) can be incorporated in the tissue-supporting deck. Components or features formed with such a material can become soft and/or more readily compressible when a current is applied thereto and rigid and/or less readily compressible when no current is applied. In certain instances, portions of the drivers can be received in the tissue-supporting deck when the material is energized and, thus, deformable to accommodate the additional structures therein.
In certain instances, 4D printed materials can facilitate selective collapse of the tissue-supporting deck of the staple cartridge, such as the staple cartridge 20100 (
Referring now to
In certain instances, 4D printed matrixes can be used in combination with foldable or collapsible drivers, for example, which are further described herein. The 4D printed matrixes on the staple cartridge, for example, can be configured to selectively fold an interfering driver feature to consolidate and/or condense the footprint and stack-up within the staple cartridge at certain temperatures. The interfering features can then unfold when withdrawn from the interference condition, such as when the cartridge body resumes the original, undeformed state. In various aspects, the driver can be fully expanded when actively lifting and firing the staples. In certain instances, the driver can encounter an interfering surface near the fully fired position thereof, and an upper portion of the driver can be configured to fold into itself. The 4D matrix can form the interference surface in certain instances.
A user may want to install a staple cartridge into a channel of an end effector or disposable loading unit quickly and easily during a surgical procedure. A robust connection can also be desired. Certain robust connections can require a clinician to overcome significant resistance and/or frictional forces between interfering components. Additionally or alternatively, a robust connection may have minimal clearances and require precise alignment of the components by the clinician. Though a robust connection between the staple cartridge and the channel may be desired, it may be helpful to make the installation of the staple cartridge quicker, easier, and/or to require less force and/or effort on the part of the clinician.
In certain instances, a stapling assembly can include leveraging features which can facilitate installation of a staple cartridge into a channel. For example, the channel and the staple cartridge can include complementary geometric alignment features. Upon placing the alignment feature of the staple cartridge against the alignment feature of the channel, the alignment feature of the channel can provide a fulcrum or abutment surface about which the staple cartridge is leveraged to properly align the staple cartridge with the channel. When the staple cartridge is properly aligned owing to the abutting relationship between the alignment features, additional alignment features (e.g. a distal lug and notch) can facilitate further connection between the staple cartridge and the channel.
In certain instances, a spring can bias the staple cartridge distally along a longitudinal axis perpendicular to an insertion axis to fully and securely seat the staple cartridge in the channel. Additionally or alternatively, a distal firing force during a firing stroke can further shift the staple cartridge distally to interconnect ramped surfaces on the alignment features (e.g. distal edges of the distal lug and notch). Alternative spring-loaded and/or resilient features are contemplated to further secure the staple cartridge to the channel upon appropriate placement of the staple cartridge relative to the channel. In certain instances, a user-activated release can be configured to release one or more resilient attachment features between the staple cartridge and the channel. In other instances, the firing stroke can result in the release and/or breakage of one or more resilient attachment features.
In one example, a stapling assembly can include a staple cartridge including a cartridge body defining a longitudinal axis, wherein the cartridge body comprises a proximal cartridge alignment feature and a distal cartridge alignment feature. The stapling assembly can further include a channel dimensioned to receive the staple cartridge, wherein the channel comprises a sidewall comprising a proximal channel alignment feature and a distal channel alignment feature positioned to receive the distal cartridge alignment feature upon positioning the proximal cartridge alignment feature in abutting engagement with the proximal channel alignment feature and moving the staple cartridge along an insertion axis to a first position in the channel. The insertion axis can be perpendicular to the longitudinal axis. A spring can be configured to bias the staple cartridge distally within the channel along the longitudinal axis from the first position to a fully seated position. The proximal alignment features can include contoured abutment surfaces. The distal alignment features can includes a notch and a lug having complementary wedge-shaped distal ends.
In various instances, the improved cartridge retention and release features can increase engagement retention forces while allowing the user to release the staple cartridge from the channel with a substantially lower force. For example, a user can slide the staple cartridge proximally by overcoming a minimal spring force to quickly and easily remove the staple cartridge from the channel. In certain instances, the force required to remove a spent or fired staple cartridge can be less than the force required to remove a new, unfired staple cartridge. For example, a firing stroke, or even a partial firing stroke, can be configured to disengage and/or release certain resilient attachment features connecting the staple cartridge to the channel.
Referring now to
The staple cartridge 24100 can be similar in certain aspects to the staple cartridge 20100 (
The cartridge body 24102 includes at least one alignment nub 24162 having a proximal alignment surface 24164. In various instances, an alignment nub 24162 can protrude laterally from each side of the cartridge body 24102. The proximal alignment surface 24164 defines a curved proximal edge of the alignment nub 24162. In various instances, the alignment nubs 24162 on either side of the cartridge body 24102 can be symmetrical about the longitudinal axis A.
The cartridge body 24102 further includes an alignment lug 24166 having a proximal end 24168 and a distal end 24170. One alignment lug 24166 is positioned on each side of the cartridge body 24102. The proximal end 24168 defines an upright or vertical surface relative to the tissue-supporting deck 24104. The distal end 24170 of the alignment lug 24166 defines a wedge shape having a ramped distal surface. The ramped distal surface can form a narrower dimension along the deck 24104 and a wider dimension at the opposite end of the alignment lug 24166. In various instances, an alignment lug 24166 can be positioned on each side of the cartridge body 24102, and the alignment lugs 24166 can be symmetrical about the longitudinal axis A. The alignment lugs 24166 are closer to the distal end of the cartridge body 24102 than the alignment nubs 24162.
The channel 24050 includes lateral sidewalls 24052 forming a U-shaped channel. The staple cartridge 24100 can be releasably secured in the U-shaped channel between the sidewalls 24052. The sidewalls 24052 and/or other portions of the channel 24050 can include resilient snap-fit features for engaging the staple cartridge 24100. Each sidewall 24052 includes an alignment feature 24054 including a proximal alignment contour 24056. The proximal alignment contour 24056 comprises an edge, which is configured to catch the proximal alignment surface 24164 of the alignment nub 24162. The proximal alignment contour 24056 resists longitudinal displacement of the alignment nub 24162 in the proximal direction beyond the proximal alignment contour 24056. As further described herein, the alignment feature 24054 can act as a fulcrum or support about which the staple cartridge 24100 is leveraged during insertion and installation of the staple cartridge 24100 into the channel 24050.
The channel 24050 further includes an alignment notch 24058 having a proximal end 24060 and a distal end 24062. An alignment notch 24058 is positioned on each side of the channel 24050. The proximal end 24060 defines an upright or vertical surface in the sidewall 24052 and the distal end 24062 defines another upright surface in the sidewall 24052, which is not parallel with the vertical surface at the proximal end 24060. The upright surface defining the distal end 24062 of the alignment notch 24058 can define a sloped or ramped distal surface, which can form a wedge shape having a narrower dimension along an upper edge of the sidewall 24052 and a wider dimension at the opposite end of the notch 24058. In various instances, the alignment notches 24058 can be symmetrically positioned about the longitudinal axis A. The alignment notches 24058 are closer to the distal end of the cartridge body 24102 than the alignment nubs 24162. As further described herein, each alignment notch 24058 is positioned and dimensioned to receive one of the alignment lugs 24166 therein.
The alignment features between the channel 24050 and the staple cartridge 24100 are configured to interact to facilitate a quick and easy installation of the staple cartridge 24100 into the channel 24050. For example, to quickly align the alignment lugs 24166 with the alignment notches 24058, a clinician can draw the alignment nubs 24162 proximally into abutting engagement with the corresponding alignment features 24054 on the channel 24050. The proximal alignment contour 24056 on the proximal alignment feature 24054 acts as a longitudinal stop, which prevents further proximal displacement of the staple cartridge 24100 relative to the channel 24050. The contoured proximal edge 24164 of the alignment nubs 24162 can match or complement the contoured profile of the proximal alignment contour 24056. Upon mating of the complementary profiles, the alignment lugs 24166 are also each aligned with their corresponding alignment notch 24058.
A spring 24172 is positioned between an upright surface of the alignment lug 24166 and an upright surface of the alignment notch 24060. More specifically, the spring 24172 is positioned between the proximal end 24168 of the alignment lug 24166 and the proximal end 24060 of the alignment notch 24060. The spring 24172 is configured to bias the ramped distal end 24170 of the alignment lug 24166 distally into mating contact with the ramped distal end 24062 of the channel 24050 upon insertion of the staple cartridge 24100 into the channel 24050. The spring 24172 can be compressed between the upright proximal end 24060 of the alignment notch 24060 and the upright proximal end 24168 of the lug 24166 when the alignment nubs 24162 are in abutting engagement with the proximal alignment contours 24056 and the staple cartridge 24100 and alignment lugs 24166 thereof are moved in an installation direction 24101 parallel to an installation axis I into the channel 24050. The installation axis I is perpendicular to the longitudinal axis A.
In use, the cartridge body 24102 and the nubs 24162 thereof can be leveraged against the proximal alignment contour 24056 of the channel 24050 as the staple cartridge 24100 is moved along the installation axis I into the channel. The proximal leverage location of the alignment contour 24056 can improve the mechanical advantage of installing the staple cartridge 24100 and distal lugs 24166 thereof into the channel 24050. The nubs 24164 can slide downward into the channel 24050 as the staple cartridge 24100 moves in the installation direction 24101 into a first position, or an inserted position. After the staple cartridge 24100 has been moved to a first position, in which the staple cartridge 24100 is inserted, but not fully seated in the channel 24050, the spring 24172 is configured to shift the staple cartridge 24100 distally in a direction parallel to the longitudinal axis L into a second position, in which the staple cartridge 24100 is fully seated in the channel 24050.
Referring primarily to
In the fully seated position (
In certain instances, a firing element is configured to apply a distal force to the staple cartridge 24100 during a firing stroke to further secure the staple cartridge 24100 in the channel 24050. For example, the ramped distal ends 24062, 24170 can form an interlock between the staple cartridge 24100 and the channel 24050 when the staple cartridge 24100 is pushed distally. In certain instances, the distal firing force and undercut geometry of the ramped distal ends 24062, 24170 can secure the staple cartridge 24100 to the channel 24050 even without the distal biasing force of the spring 24172. For example, the stapling assembly 24000 may not include a spring configured to bias the staple cartridge 24100 relative to the channel 24050 in the direction of the firing stroke. The reader will appreciate that in stapling assemblies utilizing a distal-to-proximal firing stroke, for example, the undercut interlock between the staple cartridge 24100 and the channel 24050 can be at a proximal end 24168, 24060 of the alignment lug 24166 and alignment notch 24058, respectively.
Referring primarily to
The lock 24180 also includes an anvil-facing release button 24184 opposite the latching arm 24182. The anvil-facing release button 24184 can be flush, or substantially flush, with the top surface of the distal nose 24103. The anvil-facing release button 24148 can be depressed by a clinician to drive the lock 24180 downward and/or distally to release the latch 24182 from engagement with the shelf 24082. In certain instances, the lock 24180 can be comprised of a resilient and/or deformable material, which can flex upon receiving a user input on the anvil-facing release button 24184 to move the latching arm 24182 to the second position. In other instances, the lock 24180 can pivot relative to the cartridge body 24102 to move the latching arm 24812 to the second position.
In other instances, the distal nose of a cartridge body can be deflectable to releasably engage retention features along the distal edge of the elongate channel. For example, referring now to
In various instances, the cartridge body 24302 can be a composite cartridge body comprised of different materials in different regions such that the flexibility of the unitary composite cartridge body can vary from region to region. For example, the cartridge body 24302 can be 3D-printed and include flexible and/or resilient materials for the lock 24380 and/or latching arm 24382 and less flexible and/or less resilient materials for adjacent regions in the cartridge body. Additionally or alternatively, in certain instances, adjacent portions can be printed with materials having the same or similar relatively low durometers as the lock 24380 and/or latching arm 24382; however, embedded metallic within the cartridge body, such as a metal frame and/or longitudinal support, for example, can increase the overall strength and stiffness of the cartridge body.
Additional alignment and retention features between the staple cartridge and the channel are contemplated, which can improve retention and release of the staple cartridge relative to the channel. Various features can improve the ease of aligning the components and the force required to remove the staple cartridge from the channel while maintaining sufficient retention forces between the staple cartridge and the channel. These additional alignment and retention features can be combined with the proximal alignment features between the staple cartridge and the channel further described herein.
A stapling assembly 25000 is shown in
The cartridge body 25102 includes an alignment lug 25166, which comprises a proximal end 25168 and a distal end 25170. An alignment lug 25166 can be positioned on each side of the cartridge body 25102. The proximal end 25168 can define an upright or vertical surface, and the distal end 24170 can also comprise an upright or vertical surface. The upright surfaces defining the proximal and distal ends 25168, 25170, respectively, can be parallel or substantially parallel. In various instances, an alignment lug 25166 can be positioned on each side of the cartridge body 25102 and the alignment lugs 25166 can be symmetrical about a centerline through the cartridge body 25102.
The staple cartridge 25100 also includes a lateral pin 25180 protruding outwardly from the cartridge body 25102. Another symmetrically-positioned lateral pin 25180 can protrude laterally outward on the other side of the cartridge body 25102.
The channel 25050 includes lateral sidewalls 25052 forming a U-shaped channel. The staple cartridge 25100 can be releasably secured in the U-shaped channel between the sidewalls 25052. The channel 25050 further includes an alignment notch 25058, which comprises a proximal end 25060 and a distal end 25062. An alignment notch 25058 can be positioned on each side of the channel 24050 to receive a corresponding alignment lug 25166. The proximal end 24060 defines an upright or vertical surface in the sidewall 24052 and the distal end 24062 defines another upright surface in the sidewall 24052. The upright surfaces can be parallel or substantially parallel.
In other instances, the distal ends 25062, 25170 of the alignment notch 25058, 25166, respectively, can be undercut, as further described herein, to further secure the staple cartridge 25100 to the channel 25050 when the staple cartridge 25100 is fully seated in the channel 25050.
The channel 25050 further includes a slot 25084 defining an internal track for the lateral pin 25180. The slot 25080 includes a V-shaped or tapered entry portion 25082 extending parallel to an insertion direction of the staple cartridge 25100 and a terminal portion 25084 extending parallel to a longitudinal axis of the cartridge body. The V-shaped entry portion 25082 provides a wider entry region 25083 for the lateral pin 25180 into the slot 25084, which ensures the clinician does not need to align the staple cartridge 25100 to the channel 25050 with exacting accuracy. Moreover, the wider entry region 25083 to the slot 25084 can define a larger range of longitudinal positions for the staple cartridge 25100 relative to the channel 25050 than the allowable range of longitudinal positions to align the alignment lug 25166 with an entry region 25063 of the alignment notch 25058.
The alignment features between the channel 25050 and the staple cartridge 25100 are configured to interact to facilitate a quick and easy installation of the staple cartridge 25100 into the channel 25050. For example, to quickly align the alignment lugs 25166 with the alignment notches 25058, a clinician can position the staple cartridge 25100 anywhere in the larger range of longitudinal positions for positioning the lateral pin 25180 in the entry portion 25083 of the slot 25080. As the lateral pin(s) 25180 move along the narrowing track of the V-shaped portion 25082 of the slot 25080, the lug(s) 25166 can be funneled into alignment with the alignment notches 25058.
In various instances, the staple cartridge 25100 can drop into the channel 25050 with minimal interference or frictional resistance. For example, the staple cartridge 25100 may not be secured to the channel 25050 with robust friction-fit features between the staple cartridge 25100 and the channel 25050. Instead of such friction-fit features or in addition thereto, the geometry of the slot 25080 can secure the staple cartridge 25100 in the channel 25050. For example, frictional forces exerted on the staple cartridge 25100 during a proximal-to-distal firing stroke can move the lateral pin 25180 distally along the terminal portion 25084 of the slot 25080 and shift the staple cartridge 25100 distally in the channel 25050. In such instances, the firing forces can move the lug(s) 25166 into their distal-most positions flush with the distal ends 25062 of the alignment notches 25058.
In various instances, to remove a spent staple cartridge 25100 from the channel 25050, a clinician can draw the staple cartridge 25100 proximally to remove the lateral pin 25180 from the terminal portion 25084 of the slot 25080. When the staple cartridge 25100 is shifted proximally by a clinician, which requires minimal force and exertion, the clinician can quickly and easily lift the staple cartridge 25100 out of the channel 25050.
An alternative latching mechanism between a staple cartridge 26100 and a channel 26050 for a stapling assembly 26000 is shown in
The latching arms 26180 extend along lateral sides of the staple cartridge 26000 and can be integrally formed with (e.g. molded with) the cartridge body 26102. For example, the cartridge body 26102 and the latching arms 26180 can be a unitary, single-piece component. In various instances, the latching arms 26180 can be deflectable. The latching arms 26180 includes a user-actuation button 26182 and a catch 26184. The catch 26184 is longitudinally offset from the user-actuation button 26182. A lever arm extends between the user-actuation button 26182 and the catch 26184 such that an actuation of the button 26182 is configured to deflect the catch 26184. For example, an inwardly-exerted actuation to the button 26182, is configured to deflect the catch 26184 outward out of engagement with the lateral recess 26080. In certain instances, deflection of the catch 26184 upon a clinician's actuation to the button 26182 is configured to remove the catch 26184 from the recess 26080. In other instances, the catch 26184 can move to a less engaged and, thus, more easily overcome position relative to the recess 26080. A clinician can apply a pinching motion to the buttons 26182 to simultaneously actuate both buttons 26182 and deflect both catches 26184 out of engagement with the recesses 26080.
In various instances, to install the staple cartridge 26100 in the channel 26050, the staple cartridge 26100 can be moved vertically in an insertion direction until a portion of the cartridge body 26102 rests in the channel 26050. In this position, the latching arms 26180 can be aligned with longitudinal guides along the outer surface of the sidewalls 26052. As the cartridge body 26102 is slid proximally toward a fully seated position in the channel 26050, the latching arms 26180 move along the longitudinal guides and the catches 26184 snap into the recesses 26080 to secure the staple cartridge 26100 in the fully seated position. When the staple cartridge 26100 is fully seated in the channel 26050 and the catches 26184 are engaged or locked in the recesses 26080, the width of the stapling assembly can still be within the traditional sized trocar (e.g. a 12-mm profile). To release the staple cartridge 26100 from the channel 26050, a clinician pinches the buttons 26182 to bias the catches 26184 outward from the recesses 26080 such that the clinician can remove the staple cartridge 26100 by drawing it distally along the longitudinal axis A and/or vertically away from the channel 26050.
In certain instances, the cartridge body 26102 is plastic and the latching arms 26180 are also plastic. For example, the cartridge body 26102 and the latching arms 26180 can be a molded composite plastic component.
In other instances, the cartridge body can be a composite assembly of plastic and metal. For example, the latching arms can be metallic springs, which are formed with the cartridge body. The latching arms can be insert molded metallic arms. Metal latching arms can provide a greater spring constant and a snappier latching feature than plastic arms in certain instances.
In certain instances, a stapling assembly can include a frangible cartridge retention feature, which is configured to secure a staple cartridge in the channel until the frangible cartridge retention feature is intentionally broken by a user. For example, a clinician can intentionally break the cartridge retention feature and/or the feature can be broken during the firing stroke, such as at or near the completion of the firing stroke. Breaking of the frangible cartridge retention feature, can reduce the retention force between the staple cartridge and the channel such that a clinician can remove the staple cartridge with a lower amount of force. In various instances, when the frangible feature is broken, it can remain connected to the staple cartridge body. For example, referring again to the lock 24380 in
In certain instances, a staple cartridge can include a detent that is engaged with the channel and is released from the channel upon completion of the firing stroke. Referring now to
The staple cartridge 26200 includes a detent 26280 that releasably engages the channel. The detent 26280 is movable between a locked configuration (
The detent 26280 is housed in the distal-most staple cavity 26210 in the outer row 26212c. A through-hole 26205 is defined in an outer wall 26203 of the cartridge body 26202 into the distal staple cavity 26210 in the outer row 26212c. The detent 26280 is aligned with the through-hole 26205 and protrudes from the cartridge body 26202 at the through-hole 26205 when the detent 26280 is in the locked configuration (
When the distal-most driver 26220 is in the unfired position (
In certain instances, multiple driver-releasable detents can be positioned along the length of the cartridge body 26202. In certain instances, longitudinally-staggered and/or longitudinally-symmetrically detents can be positioned along both sides of the cartridge body 26202. In addition to the drive-releasable detent 26280, the sled can be configured to release snap-fit or detent features in certain aspects of the present disclosure. Moreover, in certain instances, the driver(s) can be configured to snap or break the detent 26280 and/or the bar 26282 thereof during the firing stroke to release the attachment features.
In various instances, the staple cartridge assemblies herein can include driver retention features configured to prevent the release of the drivers from the cartridge bodies. For example, certain staple cartridges include a metal pan, which is heat-staked or thermoformed to the cartridge body after the drivers are installed in the fastener cavities. The metal pan(s) can wrap around an underside of the cartridge body and hold the drivers therein. In certain instances, the drivers can be retained without a separate metal pan to create additional space in the small form factor of the cartridge assembly. For example, as further described herein, heat stakes between the cartridge body and the drivers can retain the drivers. Additionally or alternatively, the cartridge body can be over-molded with a metal pans. For example, driver retention features can include thermoformed interference features between the drivers and the cartridge body and/or insert molded components within the cartridge body.
A staple cartridge 26300 is shown in
The cartridge body 26302 includes a row of indentations 26330, or dimples, along a lower portion of the cartridge body 26302. The row of indentations 26330 can be positioned to engage and retain the drivers 26320 when the drivers 26320 are in their unfired positions. In
The indentations 26330 in the cartridge body 26302 are configured to engage a recess 26321 in the outer surface of the driver 26320. The recess 26321 can include an upper lip or boundary, which prevents vertical displacement of the driver 26320 relative to the cartridge body 26302. In various instances, the indentations 26330 and the corresponding recesses 26320 can be thermoformed, melted, or otherwise coupled with a heat staking process. Heat staking is further described herein.
Because the drivers 26320 are triple drivers, a heat stake connection between the outer wall of the driver 26320 and the cartridge body 26302 can hold the entire driver 26320, including the intermediate support column and the inner support column, in position in the cartridge body 26302. The interference connection between the indentations 26330 and the recesses 26321 can be overcome by the sled during a firing stroke to sequentially release and lift the drivers 26320 as the sled moves along the row of indentations 26330. In certain instances, a series of heat-stakes along an inside surface in the cartridge body 26302 can engage each driver 26320 during a firing motion. In such instances, the driver 26320 can catch multiple vertical catches or dimples during the firing motion.
In certain instances, the drivers and the cartridge body can include interference features molded into the drivers and/or the cartridge body. Referring to
The drivers 26420 include an integrally-formed wedge 26421, which is narrower along a top edge 26423 of the wedge 26421 and thicker along a bottom edge 26425 of the wedge 26421. The wedge 26421 is positioned on a sidewall of a staple support column and is configured to abut a sidewall of the staple cavity 26410. For example, the staple cavity 26410 includes a vertical groove 26405, which is aligned with the wedge 26421. The wedge 26421 is configured to move along the vertical groove 26405 as the driver 26420 is lifted upward by a sled during a firing stroke. To accommodate the wedge 26421, the cartridge walls are configured to flex outward when the driver 26420 is inserted into the cartridge body 26402. In use, the firing force by the sled is sufficient to overcome the interference fit and lift the driver 26420. Stated differently, in the depicted embodiment, the wedge 26421 is configured to travel through the vertical groove 26405; however, the depth of the groove 26405 is not sufficient to allow free and clear passage of the wedge 26421 therethrough. The narrow top edge 26423 can fit in the groove without interference; however, between the narrow top edge 26423 and the thicker bottom edge 26425, the wedge 26421 can interfere with the cartridge body 26402 despite the vertical groove 26405. The interference connection between the wedge 26421 and the vertical groove 26405 is configured to hold the driver 26420 in position within the staple cavity 26410 during the firing motion and resist downward motion; the interference can be overcome by the sled during a firing stroke to sequentially release and lift the drivers 26420 as the wedge 26421 traverses the cartridge body 26402 along the row of indentations 26330. The cartridge body 26402 can continue to flex as the driver 26420 and wedge 26421 thereof move through the cavity 26410.
Referring now to
In one aspect, flat, non-bent pans can be insert molded with the cartridge body 26502 (e.g. the pans 26503a, 26503b can initially define a linear profile instead of an L-shaped profile). The cartridge body 26502 can be formed with an over-molded metal sheet along the lateral side(s) thereof, for example. Then, the exposed length of the over-molded metal sheets can be bent around a portion of the underside of the cartridge body 26502 to at least partially overlap some of the staple cavities to retain the drivers 26520 in the cartridge body 26502 from the underside thereof. In certain instances, the drivers can be triple drivers spanning outer staple cavities, intermediate staple cavities, and inner staple cavities. The bent portion of the metal sheet can overlap, or substantially overlap, the lower portion of the outer staple cavities to maintain the drivers in the cartridge body.
Alternatively, an L-shaped pan like the pans 26503a, 26503b can be snap-fit to the lateral sides of the cartridge body 26502 to retain the drivers in the cartridge body 26502 from the underside thereof without insert molding the pans 26503a, 26503b to the cartridge body 26502.
In one aspect, the pans 26503a, 26503b can be insert molded with the cartridge body 26502 and can include exposed bendable metallic flanges or arms, that are bent around the cartridge body 26502 after the drivers 26520 have been installed in the staple cavities. For example, referring now to
In various aspects of the present disclosure, the various techniques for forming a piece of metal over the outer staple cavities to retain the drivers therein can be applied to the inner staple cavities in certain instances. For example, in various aspects of the present disclosure, the staple cartridge can include a support brace, such as the support brace 650 fitted within the staple cartridge 640 (see
As described herein, driver retention and/or interlocking features with the cartridge body can be heat staked to retain the drivers in the cartridge body. In at least one aspect of the present disclosure, each driver can include a corresponding heat stake feature with the cartridge body. It can be important to ensure the heat stake depth is sufficient to keep the drivers from disengaging but does not cause interference with the drivers in their unfired or down positions. The heat stake and orbital forming techniques can be controlled to ensure sufficient engagement.
Referring now to
An insert support can be utilized in certain heat staking operations, which can reduce the amount of pressure and improve consistency. For example, a removable insert support or backer can be positioned behind each heat stake. Moreover, the insert supports can push the drivers into an upward position while staking to protect the drivers from deformation or other effects of the heat staking operation.
Referring to
During a heat staking operation, the L-shaped support frame 26803 is positioned alongside a length of the cartridge body 26802 and the insert support 26890 is positioned relative to the support frame 26803 and the cartridge body 26802 such that the fingers 26892 extend through the openings 26806 in the orthogonal flange 26809 and into staple cavities 26810. The fingers 26892 are configured to push drivers 26820 upwards toward a tissue-supporting deck 26804 of the cartridge body 26802. After the heat stakes 26805 have been formed between the cartridge body 26802 and the L-shaped support frame 26803, the insert support 26890 can be removed from the staple cartridge 26800 allowing the drivers 26820 to move downward and assume their unfired positions in the staple cavities 26810. The orthogonal flange 26809 is configured to overlay a portion of the underside of the cartridge body 26802 and may overlap multiple staple-supporting columns (e.g. an outer column and an intermediate column) and/or a bridge between two adjacent staple-supporting columns to hold the drivers 26820, which span multiple rows of staple cavities 26810, in the cartridge body 26802.
As further described herein, certain end effector components may be constructed using 3D printing technology to improve component capabilities. In certain instances, 3D printing can allow the printed component to exhibit metamaterial properties, for example. A metamaterial is a synthetic composite material with a structure such that it exhibits properties not usually found in natural materials. 3D printing is one technique used to create a metamaterial by forming components with two or more materials and/or structures therein. In other instances, insert molding and over-molding can generate composite components that may have metamaterial properties in certain instances.
Composite end effector components may exhibit greater structural strength and stiffness while allowing precision in the forming of small detailed features and can provide improved frictional properties in certain instances. For example, a metal-plastic composite cartridge body can exhibit certain metamaterial properties in that it may be stronger and stiffer than a similar injection-molded, entirely plastic, or composite, cartridge body, for example, while still allowing precision with respect to small detailed features. In certain instances, a metal-plastic composite cartridge body can demonstrate improved frictional properties with respect to the drivers movably positioned within each staple cavity. Certain composite metal-plastic components can be formed with insert molding or over-molding. In other instances, 3D printing can allow for the creation of complex geometries and/or material combinations that may otherwise be too costly and time consuming to manufacture with conventional molding techniques or, in certain instances, may even be impossible to manufacture absent 3D printing technology.
Referring to
In one aspect, the cartridge body 30002 is formed with a stamped metal frame 30001 or two or more pans that are stamped and otherwise formed into a skeleton shape for the cartridge body 30002. A plastic material 30003 is then molded over the metal frame 30001. In such instances, the metal frame 30001 can be insert molded to the plastic material 30003. The metal-plastic composite cartridge body 30002 can exhibit increased strength and collapse stiffness in comparison to entirely plastic cartridge bodies, i.e. injection molded cartridge body without a metal frame therein. Plastic material 30003 over a metal or composite frame can provide a structural functioning frame with intricate driver guidance features molded into the plastic material 30003.
The metal frame 30001 can comprise a thin metallic framework and the plastic material can be injection molded with structural members, in certain instances. In one aspect, the metal frame can constitute an integrated pan or pans, as further described herein, which can save space in the cartridge body and/or increase the tissue gap. Additionally, metal can be utilized for certain components related to lockouts, cartridge identification, and resetting. The metal can be less prone to breaking or cracking in certain instances and can withstand significant forces, which may be helpful for lockout components and/or mechanical keys (e.g. an extending tab or post) to prevent insertion of the staple cartridge into an incompatible channel and/or device Certain metallic components can be resilient during a firing stroke reset, i.e. when retracting the sled during manufacturing to test cartridge and ensure all components have been installed. Moreover, a composite metal-plastic cartridge body can facilitate smart cartridge technology, integrated wiring, and/or flexible circuits.
In certain instances, the metal frame 30001 could have flanges that interconnect or span multiple walls and/or columns in the cartridge body. For example, certain walls in the cartridge body can be thinner than other walls and the flanges can connect a thinner wall with a thicker wall to better distribute a torque load, rather than twisting the support. In certain instances, the main standing support walls in the cartridge body can be connected to an adjacent thicker support walls by the metal frame. For example, a thinner interior cartridge wall can be coupled to a thicker exterior cartridge wall to improve force distributions during clamping and/or firing.
In other instances, a composite plastic-metal cartridge body can be 3D-printed. The orientation of the 3D build forming the composite plastic-metal cartridge body can be optimized to ensure smooth driver motions during the firing stroke. For example, referring again to
The composite plastic-metal cartridge body 30002 can be printed layer-upon-layer along the longitudinal axis A of the cartridge body 30002. Stated differently, the orientation of the 3D build can be orthogonal to the longitudinal axis A and/or orthogonal to the tissue-supporting deck 30004. When the directional 3D printing of the cartridge body 30002 is perpendicular to the longitudinal axis A (e.g. proximal-to-distal), the build layers can be aligned with the direction of driver motion during the firing stroke. Referring again to
The 3D build for a composite plastic-metal cartridge body is proximal-to-distal in certain instances. In other instances, the 3D build can be distal-to-proximal, for example. Support structures for certain 3D builds can be minimized when building the narrower body portion on top of a wider distal nose of the cartridge body, in certain instances.
In various instances, a 3D-printed composite cartridge body can include different infill percentages and/or different materials to obtain metamaterial properties related to improving the strength of the cartridge body while minimizing frictional forces during the firing stroke. Moreover, the support walls of such a cartridge body can define open spaces, voids, and/or cells therebetween. In various instances, the spaces between the support walls, such as the thin walls between the staple cavities, for example, can be configured to allow for improved bending resistance during a clamping load. For example, the spaces between the support walls of the cartridge body can include 3D-printed internal fillets, chamfers, and/or struts, which are configured to improve the open cell strength of the support walls.
Certain cartridge bodies described herein may include a smaller cross-sectional geometry, less material, and/or thinner support walls owing to the footprint of a central firing screw (e.g. the firing screw 261 in
Referring now to
The cartridge body 30102 is similar in many aspects to the cartridge body 20102 (
The bridge 30106 is a frangible portion, which is configured to be cut or transected by the upright cutting edge 30146 of the firing member 30144 during a firing stroke. In various instances, the geometry of the bridge 30106 is configured to mitigate the risk of splintering. For example, the geometry can allow for a predictable geometry and orientation of destruction of the bridge 30106. In instances in which the cartridge body 30102 is 3D-printed, for example, the cartridge body 30102 can include a different material, different infill percentage, and/or different infill geometry along the bridge 30106 or portions of the bridge 30106 compared to adjacent portions of the cartridge body 30102, which can further facilitate transection of the bridge 30106 during the firing stroke without damaging the firing member 30144 and/or splintering the cartridge body 30102 from the firing load.
In certain instances, as further described herein, the staple cartridge 30100 can include a single-use knife, for example, which can transect the bridge 30106 during the firing stroke. Where a single-use knife is utilized, the knife does not risk becoming dull for a subsequent firing stroke upon transecting the frangible portion of the bridge 30106. The bridge 30106 can comprise a plastic molded and/or 3D-printed component, for example, which can be easily transected by the upright cutting edge 30146 without significant resistance thereof. In other instances, a reusable knife can be used to cut the bridge 30106.
In certain instances, the bridge 30106 can include rows of perforations and/or break/tear lines along which the bridge 30106 is configured to separate from the cartridge body 30202. Referring to
In certain instances, as further described herein, a replaceable staple cartridge can include a single-use knife, which may provide a fresh cutting edge for each firing stroke. However, to cut tissue clamped between the jaws of an end effector, the knife should extend beyond the tissue-supporting deck of a staple cartridge, in various instances. Such a protruding knife and cutting edge risks unintentional and/or inadvertent contacts outside of the firing stroke, which may damage tissue and/or dull the cutting edge. For example, the cutting edge may inadvertently contact and/or cut the tissue of a patient and/or clinician before the firing stroke, such as when the staple cartridge is being loaded into the end effector. In other instances, upon completion of the firing stroke, the cutting edge may remain in a distal protruding position and may inadvertently contact and/or cutting the tissue of a patient and/or clinician when the end effector unclamps the tissue and is being withdrawn from the surgical site. Additional unintentional tissue contact scenarios are contemplated.
In various instances, a tissue-transecting knife can be mounted to a sled in the staple cartridge. As the sled moves through the firing stroke, the knife can also move through the cartridge body. Moreover, the sled can interact with the firing member (e.g. the I-beam or E-beam) in the end effector. For example, the sled and knife thereon can be releasably coupled to the firing member, such that the sled and knife are advanced distally during a firing stroke. In certain instances, the sled and the knife can be retracted proximally along with the firing member upon completion or termination of the firing stroke. In such instances, the knife can be reset and/or returned to a proximal position in the cartridge body before the firing member permits the opening of the jaws. In such instances, the protruding knife and cutting edge thereof can returned to a predictable and/or at least partially-shielded position at the proximal end of the cartridge body. In other instances, a sled can include multiple separable components (e.g. a two-part sled), and a portion of the sled can be retracted proximally, while another portion of the sled remains in a distal position. In certain aspects, the retractable portion of the sled can include the knife. In still other instances, the non-retractable portion of the sled can include the knife, which can be directed downward into the cartridge body as the retractable portion of the sled moves past it. In certain instances, a portion of the sled can interact with a lockout feature to prevent a firing stroke when the cartridge is missing and/or spent.
In one aspect of the present disclosure, a firing member can include a distally-extending hook and the sled can include a proximal cavity dimensioned to receive the distally-extending hook. Moreover, the knife can be pivotably coupled to the sled and positioned to selectively engage and retain the distally-extending hook in the sled. For example, the distally-extending hook can hook around a portion of the knife. In various instances, interconnection of the distally-extending hook and the knife is configured to hold the knife in a protruding position relative to the cartridge body.
In such instances, the knife can be moved to the protruding position, in which the cutting edge is positioned to transect tissue clamped between the jaws, when the firing member is advanced into engagement with the sled. Prior to the firing stroke, the knife can be pivoted into a shielded position, in which at least a portion of the cutting edge is shielded by the sled and/or cartridge body. Moreover, upon completion of the firing stroke, the firing member can return with the sled to a proximal position in the cartridge body and return to its shielded position. In various instances, the foregoing arrangement may avoid certain inadvertent tissue contacts outside of the firing stroke.
Referring now to
The firing member 30342 includes a body portion 30343, upper cam members 30344 extending laterally from both sides of the body portion 30343, and lower cam members 30345 extending laterally from both sides of the body portion 30343. The upper cam members 30344 are configured to cammingly engage an upper jaw, or anvil, of the end effector 30340 during a firing stroke, and the lower cam members 30345 are configured to cammingly engage a lower jaw, or elongate channel of the end effector 30340 during the firing stroke.
Further to the above, a longitudinal opening extends through the body portion 30343. The longitudinal opening is configured to receive the rotary drive screw described above. The body portion 30343 further includes a cutout region 30349 configured to receive a firing drive nut 30350. The firing drive nut 30350 is configured to threadably engage the rotary drive screw to convert rotary motion of the rotary drive screw into translation of the firing member 30342. The firing drive nut 30350 also includes laterally-extending members 30351 that extend from both sides of the firing drive nut 30350. The laterally-extending members 30351 are aligned with the lower cam members 30345. As such, the cam members 30345, 30351 cooperate to cammingly engage the lower jaw of the end effector 30340 during the firing stroke.
The body portion 30343 of the firing member 30342 also includes a distal nose portion 30346, that extends distally and forms a distal sled-abutment surface 30352. A distal extension 30347 extends from the distal sled-abutment surface 30352 in a substantially distal direction and is configured to selectively interlock with the sled assembly 30320. More specifically, the distal extension 30347 includes a transverse portion or catch 30348 extending in a direction transverse to the distal direction. The distal extension 30347 and the catch 30347 form a hooked geometry, which selectively engages a portion of the sled assembly 30320, as further described herein.
The sled assembly 30320 includes a sled body 30321 and a knife 30338 having rails 30322 positioned to engage drivers, such as the drivers 20120 (
The upright hub 30334 includes a recess or space 30328 between the sidewalls 30335 and a shaft or pin 30336 extending between the sidewalls 30335. A stop 30337 also extends between the sidewalls 30334, and is further described herein. The knife 30338 of the sled assembly 30320 is pivotably mounted to the pin 30336 at a hub 30339. In various aspects, the hub 30339 can define a hub diameter that permits rotation of the knife 30338 about the pin 30336. Moreover, the knife 30338 includes a mounting slot 30329 having a narrower width than the hub diameter and into which the pin 30336 passes to secure the hub 30339 to the pin 30336. In various instances, the knife 30338 can be snap-fit or press-fit onto the pin 30336, for example. Referring to an exploded view of the sled assembly 30320 in
In various instances, the knife 30338 can pivot into a downward or recessed position relative to the sled body 30321. For example, the knife 30338 and cutting edge thereof can face generally downward, for example, and/or be shielded by the sidewalls 30335 when the knife 30338 is in the recessed position. In certain instances, a biasing element is configured to bias the knife 30338 toward the recessed position.
Referring primarily now to
Thereafter, the firing member 30340 can advance the sled assembly 30320 distally. As the sled assembly 30320 moves distally, the knife 30338 is pushed in a clockwise direction from the orientation shown in
A proximal retraction motion of the firing member 30320 is shown in
In various instances, the interconnection between the firing member 30340 and the sled assembly 30320 is configured to ensure that the sled assembly 30320 and the knife 30338 thereof are reset in a proximal position in the staple cartridge 30300 before the jaws are released from engagement by the cam members 30344, 30345, 30351 of the firing member 30340 and permitted to open. When firing member 30340 is further retracted and withdrawn from the staple cartridge 30300, the distal extension 30347, catch 30348, and/or the end portion 30328 can be configured to deflect to release the distal extension 30347 from the sled body 30321 and pivot the knife 30338 further counterclockwise from the orientation in
In certain aspects of the present disclosure, a sled can be stamped from a sheet of metal. In certain instances, the sled can be a two-part sled formed from two stamped sheets. The stamped sleds can having substantially W-shaped profiles in certain instances. The knife can be integral with one of the stamped sheets, for example. In certain instances, the two-part sled can include a first stamped component, which is retractable with the firing member, and a second stamped component, which is not retracted with the firing member. In a proximal, unfired position, the second stamped component is configured to interact with and overcome a missing and spent cartridge lockout. In a distal, fired position from which the second stamped component is not retracted by the firing member, the missing and spent cartridge lockout is configured to engage the firing member and prevent a firing stroke.
The two-part sled and lockout arrangement can prevent a firing stroke when the staple cartridge is missing from the end effector and/or when a spent or empty staple cartridge is installed in the end effector. Moreover, the sled being formed from two stamped metal sheets can provide a lower cost sled, in certain instances, with an integrated knife and cutting edge(s), coupling feature(s) for the firing member, and lockout engagement feature(s). Such a stamped metal sled can prevent bending or mushrooming of the sled rails under high staple-forming loads and may prevent breaking or cracking of the sled in certain instances. Moreover, the stamped metal sled can define thin rails allowing for more plastic (or other material(s)) in the cartridge body, which can improve the strength of the cartridge body including the strength of the support walls between the staple cavities. In certain instances, the thin profile of a stamped metal sled can allow the drivers to be positioned closer together and can better accommodate a rotary drive screw in certain instances.
Referring now to
Referring primarily to
Further to the above, a longitudinal opening extends through the body portion 30343. The longitudinal opening is configured to receive the rotary drive screw 30442 described above. In certain instances, the rotary drive screw 30442 can be threadably coupled to the body portion 30343 and, in other instances, can be threadably coupled to a firing drive nut housed therein, as further described herein.
Referring primarily to
The proximal sled 30422 and the distal sled 30424 can be connected with a push-connection. Stated differently, while the proximal sled 30422 is applying a pushing force to the distal sled 30424, the sleds 30422, 30424 can remain connected. Absent the pushing force, the sleds 30422, 30424 are separable components which can be selectively moved and relocated in certain instances.
Each sled 30422, 30424 includes a pair of stamped wedges, which form the rails. The proximal sled 30422 includes outer rails 30423 for the sled assembly 30420, and the distal sled 30424 includes inner rails 30425 for the sled assembly 30420. An outer rail 30423 and an inner rail 30425 can be configured to move along each side of the staple cartridge during a firing stroke and can be aligned with a row of drivers 30416. Between the rails 30423, 30425, the proximal and distal sleds 30422, 30424 includes a central upright portion 30426, 30428, respectively, defining a lower arced profile 30426a, 30428a to accommodate the rotary drive screw 30442 (
The sled assembly 30420 is shown in an staple cartridge in
The proximal sled 30422 and the distal sled 30424 can be aligned and assembled along an assembly axis A (
Referring still to
In various instances, when the staple cartridge 30400 is installed in the cartridge jaw 30450, the firing member 30441 can be aligned with the driver assembly 30420, and can be configured to move into driving engagement with the driver assembly 30420, as shown in
The proximal extension 30434 can be biased into holding engagement with the recess 30448 in the body 30443 of the firing member 30441 and can remain in engagement with the recess 30448 during proximal and distal displacement(s) of the firing member 30441 until the firing member 30441 is finally withdrawn proximally out of the staple cartridge 30400, or nearly out of the staple cartridge 30400, at the completion of the firing stroke. When the firing member 30441 is releasably attached to the proximal sled 30422, the upright body portion 30443 of the firing member 30441 is aligned with the knife 30430. As shown in
The distal sled 30424 is pushed distally by the proximal sled 30422 during the firing stroke. The distal sled 30424 further includes a foot 30429 (
Referring primarily to
The lockout arm 30460 includes a proximal end 30466 that is biased into a lockout notch 30449 in the firing member 30341. For example, a spring 30470 positioned in the cartridge jaw 30450 is configured to push the proximal end 30466 into the lockout notch 30449 of the firing member 30341 when the firing member 30341 is in a proximal, pre-firing stroke position. When the proximal end 30466 of the lockout arm 30460 is received in the lockout notch 30449, the lockout arm 30460 is configured to resist translation of the firing member 30441 and, thus, prevent the firing stroke
The sled assembly 30420 is configured to overcome the lockout arm 30460 by removing the proximal end 30466 thereof from the lockout notch 30449. More specifically, when the distal sled 30424 is positioned in a proximal, unfired position in the staple cartridge 30400, the foot 30429 of the distal sled 30424 is positioned to engage a distal end 30462 of the lockout arm 30460 (see
For example, the lockout arm 30460 pivots from the locked position to the unlocked position when the staple cartridge 30400 is installed in the end effector 30440 and the distal sled 30424 is in the proximal unfired position, which indicates that the staple cartridge is not spent or empty. The lockout arm 30460 pivots from the unlocked position to the locked position when the firing member 30441 pushes the proximal sled 30422 distally, which pushes the distal sled 30422 distally. When the foot 30429 on the bottom of the distal sled 30422 moves out of engagement with the distal end 30462 of the lockout arm 30460, the lockout arm 30460 pivots due to the biasing force of the spring 30470. When the firing member later returns to a proximal position after a firing stroke and attempts to move the lockout notch 30449 past the lockout arm 30460, the spring 30470 pushes the proximal end 30466 of the lockout arm 30460 into the lockout notch 30449 to prevent the firing stroke. The foot 30429 moves along the longitudinal recess 30453 in the channel 30450 during the firing stroke.
As described herein, the two-part sled assembly 30420 is configured to selectively overcome the lockout arm 30460 to permit a firing stroke. Moreover, the sled assembly 30420 includes an integral knife 30430, which is a single-use knife 30420 have a suitably sharp cutting edge 30432 for transecting tissue clamped by the end effector 30440. The single-use knife 30420 is retracted proximally upon completion of the firing stroke and along with the firing member 30441. Moreover, because the firing beam 30441 includes opposing cams 30445, 30446, the firing member 30441 can ensure that the jaws 30450, 30542 remain closed until the knife 30420 is returned to a proximal position in the staple cartridge 30400.
As described herein, certain surgical devices can include a reusable knife, which is incorporated into the surgical device, such as a distal-facing knife edge on a firing member, for example. Upon completion of a firing stroke, the reusable knife can be retracted out of the staple cartridge and subsequently re-fired with another staple cartridge. In such applications, the surgical device, including the reusable knife thereof, can be cleaned and sterilized between surgical procedures.
In other instances, a single-use knife can be utilized with a surgical device. For example, a staple cartridge can include a single-use knife which is only used with that particular staple cartridge. When the staple cartridge is removed from the surgical device, the single-use knife is removed, as well. When a replacement staple cartridge is installed in the surgical device, a new single-use knife is provided therewith. In certain instances, the single-use knife can remain in the staple cartridge for the duration of the firing stroke and even after the firing stroke when the staple cartridge is removed from the surgical device. In certain instances, the cutting edge of the single-use knife can be at least partially shielded by a feature of the staple cartridge after the firing stroke and/or when the staple cartridge is removed from the surgical device. In certain instances, the knife or a portion thereof can be folded or otherwise deformed and/or pushed from a protruding orientation downward into the staple cartridge.
For example, a staple cartridge can include a two-part sled assembly including a proximal sled and a distal sled. The proximal sled can connect to a firing member upon insertion of the two-part sled assembly into a surgical device. The distal sled can include an upright cutting edge. During a firing stroke, the firing member is configured to push the proximal sled distally, which, in turn, pushes the distal sled distally to transect tissue. Upon completion of the firing stroke, the proximal sled can be retracted proximally by the firing member and can separate from the distal sled. As the proximal sled is retracted proximally, a central ledge of the proximal sled is configured to move over the upright cutting edge to fold the cutting edge downward into the cartridge body. In various instances, the proximal sled can also include support features for supporting the upright cutting edge during the firing stroke.
In certain instances, the two-part sled assembly can be manufactured from stamped metal sheets, which can be a low cost alternative to other manufacturing techniques. A stamped metal sled assembly can have thinner rails yet be stronger than a plastic sled for the same size staple cartridge, in certain instances. Moreover, a stamped metal sled assembly can form staples with less spring back and/or allow the staples to be positioned closer together in a staple line, in certain instances. In certain instance, the knife can be configured to dive and/or be deformed into the cartridge body anywhere along the length of the firing stroke and only the proximal stamped sled component can return with the firing member. The folding and/or deformation of the knife during the proximal retraction of the firing member and proximal stamped sled component can ensure the knife is not reused during a subsequent surgical operation. The proximal stamped sled component and the firing member can be positioned to support the distal stamped sled component and the knife thereof during the distal firing stroke in certain instances.
Referring now to
The proximal sled 30622 and the distal sled 30624 can be connected with a push-connection. Stated differently, while the proximal sled 30622 is applying a pushing force to the distal sled 30624, the sleds 30622, 30624 can remain connected. Absent the pushing force, the sleds 30622, 30624 are separable components that can be selectively moved and relocated in certain instances.
Each sled 30622, 30624 includes a pair of stamped wedges, which form the rails. The proximal sled 30622 includes outer rails 30623 for the sled assembly 30620, and the distal sled 30624 includes inner rails 30625 for the sled assembly 30620. An outer rail 30623 and an inner rail 30625 can be configured to move along each side of the staple cartridge during a firing stroke and can be aligned with a row of drivers 30616. The proximal sled 30622 includes a central upright portion 30626 and orthogonal flanges 30621 connecting the central upright portion 30426 to each outer rail 30623. The orthogonal flanges 30621 are configured to ride along a lower support surface during a firing stroke (e.g. along an inside surface of a cartridge jaw) and have the same thickness as the outer rails 30423 owing to the stamped formation of the proximal sled 30622. The central upright portion 20426 is dimensioned to fit around a portion of the distal sled 20624 and defines a ledge 30627.
The distal sled 30624 includes a central upright portion 30628 and orthogonal flanges 30619 connecting the central upright portion 30626 to each inner rail 30625. The orthogonal flanges 30619 are configured to ride along a lower support surface during a firing stroke (e.g. along an inside surface of a cartridge jaw) and have the same thickness as the inner rails 30625 owing to the stamped formation of the distal sled 30624. The central upright portion 30628 defines a lower arced profile 30626a dimensioned to accommodate a rotary drive screw 30642 (
Referring primarily to
Referring now to
As shown in
When the staple cartridge 30600 is properly seated in the surgical end effector and the proximal sled 30622 is releasably held to the firing member 30641, a firing stroke can be initiated. At the outset of the firing stroke, the firing member 30641 is advanced distally and the firing assembly 30639 assumes the first advanced configuration of
In the first advanced configuration, the firing member 30641 is positioned to push the proximal sled 30622 and the proximal sled 30622 is positioned to push the distal sled 30624. In effect, the firing member 30341 is in pushing engagement with the sled assembly 30620 and can push the collective sled assembly 30620 distally to fire the staples and cut tissue. In the first advanced configuration, the upright body portion 30643 of the firing member 30641 is pushed distally into abutting engagement with the knife 30629. In this configuration, the firing member 30641 is configured to support the knife 30629 during the firing stroke.
Upon completion of the firing stroke or a portion thereof, the firing member 30641 can be retracted proximally. Proximal retraction of the firing member 30641 is configured to unclamp the jaws in various instances, as further described herein. The proximal retraction motion is shown in
From the first retracted configuration, the firing member 30641 is configured to retract the proximal sled 30622 along with the firing member 30641. The anti-retraction arms 30632 on the distal sled 30624 are configured to hold the distal sled 30624 in place in the cartridge body 30602 as the proximal sled 30622 is retracted. In the second retracted configuration (
Referring primarily to
Certain staple cartridges described herein can include a central longitudinal support frame and/or a rotary drive screw extending along a substantial length of the staple cartridge. In various instances, the structures along the center of the staple cartridge can occupy a significant portion of the staple cartridge footprint and, notably, take up a significant width, which can impact the arrangement of staple cavities, staple drivers, and staples therein. Certain modifications to a staple line can impact hemostasis. Adjustments to the staple line configuration such as number of staples and spacing therebetween within a longitudinal row, lateral spacing between longitudinal rows, and variations in number of staples, spacing therebetween, and placement of proximal-most staples (i.e. offset) can be adjusted from row-to-row. Various staple line configurations are described herein, which are configured to optimize hemostasis and balance firing forces within the small footprint of the various staple cartridge assemblies described herein.
The sled is subjected to significant forces during a firing stroke. For example, as the sled engages the drivers and lifts the drivers and staples thereon through the tissue and into forming contact with the anvil, significant transverse loads can be applied to the sled rails. To smooth the force-to-fire during a firing stroke, the staple patterns on opposing sides of the cartridge can be longitudinally offset.
Referring now to
More specifically, the first pattern 25014 is longitudinally offset from the second pattern 25016 by a distance, or longitudinal offset, O. Consequently, the first pattern 25014 and the second pattern 25016 are not symmetric relative to the longitudinal axis A. The first pattern 25014 includes proximal-most staples cavities, and the second pattern 25016 includes proximal-most staple cavities. The longitudinal offset O between the proximal ends of the proximal-most staple cavities on either side of the longitudinal axis L is the longitudinal offset O.
As further described herein, triple drivers include three staple-supporting columns connected by bridges. The triple drivers define a longitudinal length from the proximal end of the proximal-most support column to the distal end of the distal-most support column. The longitudinal length is length along the longitudinal axis A, e.g. the proximal-to-distal length of a driver configured to fire staples from a first cavity 25010a, a second cavity 25010b, and a third cavity 25010c. The proximal-to-distal length of a triple driver can be 0.1936 inches in certain instances. Other lengths are also contemplated.
The longitudinal offset is configured to smooth the force-to-fire of the sled during the firing stroke in various instances. In various instances the longitudinal offset O is approximately 25% of the longitudinal length of the triple drivers housed in the staple cavity. In other instances, the longitudinal offset O can be less than 25% or more than 25% of the longitudinal length of the triple driver. For example, a longitudinal offset O of 5% to 35% of the longitudinal length of the triple driver is contemplated. Referring to
In certain instances, the triple drivers can be triangular, and the drivers on one side of the cartridge body are not aligned with the drivers on the opposite side of the cartridge body. An asymmetric arrangement of triple drivers in a cartridge body can allow the sled to be asymmetric about a longitudinal centerline. In such instances, one side of the cartridge body can have additional space at the proximal end where that side of the driver is longitudinally offset in a distal direction. The additional space can accommodate lockout components and/or rotary driver supports. Exemplary lockouts and rotary driver supports are further described herein. In certain instances, lockout components and rotary drive supports can be at least partially side-by-side in the proximal end of the cartridge body.
In other instances, the sled rails can be longitudinally offset to balance the force-to-fire. For example, the sled rail(s) on a first side of the sled can be longitudinally offset from the sled rail(s) on the opposite side of the sled by 25% of the longitudinal length of the triple drivers housed in the cartridge body 25002.
Referring again to
In other instances, none of the rows of staple patterns on one side of a cartridge body, e.g. one side of the longitudinal knife slot, can be a repeated pattern. A non-repeating and unique pattern in each row can permit customizations row-to-row to ensure a maximum number of staple cavities fit in the cartridge body, especially in a proximal region near the tissue stops. Moreover, in certain instances, the staple pattern can utilize the same drivers, e.g. the same triple driver, along the entire length of the staple line. In such instances, only a single type of driver is utilized in the staple cartridge, which can improve manufacturing processes. In certain instances, proximal-most and/or distal-most fastener cavities in the inner row and the outer row can be offset, for example.
Referring now to
In the first and second patterns 25314, 25316, the proximal-most staple cavity 24310a is longitudinally offset from the second proximal-most staple cavity 25310b by a first distance, or longitudinal offset, O1. Additionally, in the first and second patterns 25314, 25316, the second proximal-most staple cavity 24310b is longitudinally offset from the third proximal-most staple cavity 25310c by a second distance, or longitudinal offset, O2. The first longitudinal offset O1 is less than 50% of the staple crown lengths L1, L2, and L3, of staples in the inner row 25012a, intermediate row 25012b, and the outer row 25012c, respectively. The second longitudinal offset O2 is selected based on the longitudinal offset O1 to stagger the staples fired from the intermediate row 25012c relative to the staples fired from the inner rows 25012a and the outer rows 25012c. Stated differently, the second longitudinal offset O2 is selected to provide at least a small degree of longitudinal overlap row-to-row. The second longitudinal offset O2 is greater than the first longitudinal offset O1.
Referring still to the patterns 25314, 25316, the rows 25312a, 25312b, 25312c on each side 25002a, 25002b are different from the other rows on that side. More specifically, the number of cavities and spacing between the cavities in the same; however, the starting location of the rows 25312a, 25312b, 25312c differs.
Moreover, each row 25312a, 25312b, 25312c extends along an axis that is parallel to the longitudinal axis L. The lateral spacing of the rows 25312a, 25312b, 25312c, i.e. the spacing of the axes along which the rows extend, can be different. For example, on both sides 25302a, 25302b, the lateral spacing between the inner row 25312a and the intermediate row 25312b is less than the lateral spacing between the intermediate row 25312b and the outer row 25312c.
In certain instances, rows on the same side 25002a, 25002b can be configured to receive different staples and/or can be aligned with forming pockets configured to form the staples to different sizes and/or geometries. For example, on the same side 25002a, 25002b but in different rows, certain staples can be larger than the staples in other rows and/or can be configured to be formed to a taller formed height than the staples in other rows. Additionally or alternatively, staples from the same side 25002a, 25002b can be formed into a 2D, planar configuration while staples on that same side 25002a, 25002b are configured to be formed into a 3D, non-planar staple.
As further described herein, triple drivers include three staple-supporting columns connected by bridges. In various instances, the staple patterns 25314 and 25316 can be fired exclusively with triple drivers. Stated differently, a single type of driver an fire all of the staples from the patterns 25314, 25316.
Other staple patterns having non-identical rows are also contemplated. For example, in certain instances, the inner row and the outer row can be symmetrical about the intermediate row until the proximal-most cavity and/or cavities which are positioned closer together to accommodate the tissue stops. In such instances, the inner row and the outer row would have some longitudinally aligned staples row-to-row and other non-longitudinally aligned staples row-to-row. In other instances, one of the rows could have fewer staples than the other rows. For example, the outer row could have few staples, which are spaced longitudinally farther apart.
Referring now to
Each staple cartridge 25400, 25500 also includes a datum 25408, 25508, respectively, corresponding to the distal end of a tissue stop. When the clinician initially locates the target tissue between the anvil and the staple cartridge, it is important that the target tissue be located so that the knife does not cut into the target tissue unless it is first stapled. Tissue stops can be provided on the proximal end of the anvil body to prevent the target tissue from moving proximally past the proximal most staple pockets in the staple cartridge.
In certain instance, a cartridge body can include at least one totaled or combined staple length on each side of the longitudinal axis A proximal to the tissue stop. A combined staple length is sum of the length of one or more staples or portions thereof positioned proximal to the tissue stop. The sum of those individual lengths is equivalent to the combined staple length. For example, referring to the staple cartridge 25400, one full staple and two half staples are proximal to the tissue stop for a combined staple length of two staples. However, because at least one combined staple length is desired proximal to the tissue stop datum 25408, there is little room to shift the tissue stop datum 25408 proximally.
Conversely, referring to the staple cartridge 25500, the tissue stop is in a relatively more proximal position relative to the proximal end of the staple cartridge 25500 and the proximal-most fastener cavities. Moreover, the combined staple length on each side of the cartridge body still meets the goal of at least one combined staple length proximal to the tissue stop datum 25508. Having two staple cavities longitudinally aligned, or closely aligned, at the proximal end of a pattern of staple cavities can allow the tissue stop to move proximally while still maintaining a suitable combined staple length proximal to the tissue stop.
Firing elements and various end effector components are subjected to high loads during the firing stroke. The loads imparted may cause deformation and/or wear of the firing elements and/or end effector components. For example, during a firing stroke, a firing element which cammingly engages an anvil and an elongate channel of an end effector may at least partially ride within an anvil slot in the anvil and along the bottom of the elongate channel. During firing, the anvil is in its closed position, however, as the firing element moves through the end effector, the anvil may attempt to move away from the elongate channel due to the forces associated with firing. For example, the force to form the staples, the force to sever the tissue, and the reactionary forces from the clamped tissue as it is cut and stapled. These forces are imparted onto the firing element during firing and can cause deformation or wear on the firing element and/or other end effector components.
In various embodiments, end effector components may be constructed using three dimensional (“3D”) printing to improve component capabilities. In certain instances, 3D printing can allow components to exhibit metamaterial properties to aid in lowering the force to fire. A metamaterial is a synthetic composite material with a structure such that it exhibits properties not usually found in natural materials. 3D printing is one technique used to create a metamaterial to form structures with two or more materials. As such, 3D printing allows for the creation of complex geometries and/or material combinations that may otherwise be too costly and time consuming to manufacture or may even be impossible to manufacture absent 3D printing technology.
In various embodiments, a firing element may be 3D printed such that its main body acts as a spring to allow the upper and/or lower cam portions to flex and move to contact the anvil and elongate channel at an angle of reduced resistance.
The distal head portion 41200 further includes an upper portion 41210 and a lower portion 41220 that are movable relative to one another. The cutout portion 41250 is defined in both the upper and lower portions 41210, 41220. As such, the distal end of the firing bar portion 41100 is in engagement with both the upper portion 41210 and the lower portion 41220 of the distal head portion 41200. Further, the distal head portion 41200 includes a protruding nose 41230 that extends distally. The protruding nose 41230 is configured to engage and drive a sled of a surgical staple cartridge distally during a firing stroke, for example. The protruding nose 41230 can be configured to defeat a firing lockout of a surgical instrument, for example. Further, the distal head portion 41200 includes a knife portion or cutting member for severing the tissue of a patient during a firing stroke of the firing member 41000 in certain aspects of the present disclosure.
Further to the above, the distal head portion 41200 comprises a flexible portion 41240 that connects the upper portion 41210 and the lower portion 41220 of the distal head portion 41200. Specifically, the flexible portion 41240 comprises a top end 41260 defined in the upper portion 41210, and a bottom end 41270 defined in the lower portion 41220. In at least one embodiment, the flexible portion 41240 is embedded into the distal head portion 41200. However, other attachment arrangements are envisioned for the upper portion 41220, the lower portion 41220, and the flexible portion 41240. For example, the entire distal head portion 41200 may be 3D printed having different materials for the different portions of the distal head 41200.
In at least one embodiment, the distal head 41200 is comprised of a first material and the flexible portion 41240 is comprised of a second material that is different from the first material. For example, the flexible portion 41240 may be comprised of aluminum and the remainder of the distal head portion 41200 may be comprised of stainless steel. However, other embodiments are envisioned with different materials for the distal head portion 41200 and the flexible portion 41240 such as plastic, ABS, rubber, and/or various polymers. In the illustrated embodiment, the flexible portion 41240 is shaped like an “I” having an upright portion and orthogonal flanges at both ends of the upright portion, however other embodiments are envisioned with different cross-sectional shapes for the flexible portion 41240.
Further to the above, the distal head portion 41200 comprises an upper cam member defined on the upper portion 41210, and a lower cam member defined on the lower portion 41220. The upper and lower cam members are configured to cammingly engage a first jaw and a second jaw of an end effector of a surgical instrument to approximate the first jaw and the second jaw relative to one another during a firing stroke. As such, the upper portion 41210 and the lower portion 41220 may separate to accommodate a transverse load imparted on the distal head portion 41200 during the firing stroke. Specifically, as depicted in
In any event, other embodiments are envisioned where both the upper portion 41210 and the lower portion 41220 move during a firing stroke in response to a firing load. Further, other embodiments are envisioned where only the lower portion 41220 moves during a firing stroke.
Further to the above, when the distal head 41200 extends vertically to an expanded configuration, the flexible portion 41240 stretches vertically while maintaining the connection between the upper and lower portions 41210, 41220 of the distal head 41200. When the flexible portion 41240 is stretched, an intermediate portion 41265 of the flexible portion 41240 may neck down or narrow to accommodate a transverse load as depicted in
Further to the above, the distal head portion 42320 is a two-part assembly formed from an upper portion 42330 and a lower portion 42340 that are movable relative to one another. The upper portion 42330 comprises a distally-protruding lower foot 42334 and the lower portion 42340 comprises a proximally-protruding upper foot 42342 positioned to interact and selectively interlock with the distally-protruding lower foot 42334. An opening 42400 is defined between the distally-protruding lower foot 42334 and the proximally-protruding upper foot 42342 when the upper portion 42330 and the lower portion 42340 are in a collapsed configuration, as depicted in
Further to the above, the distally-protruding lower foot 42334 extends into a pocket, or cavity 42346, in the lower portion 42340. The cavity 42346 defines a flange 42348 on the proximal end of the lower portion 42340. The flange 42348 extends toward the upper portion 42330 and prevents the distally-protruding lower foot 42334 of the upper portion 42330 from becoming detached from the lower portion 42340. Specifically, the opening 42400 height is smaller than the height of the flange 42348 and, thus, the upper portion 42330 and the lower portion 42340 are prevented from detaching in the longitudinal direction.
Further to the above, the upper portion 42330 and the lower portion 42340 of the distal head portion 42320 can be connected via a flexible attachment member, such as the flexible portion 41240 of
Further to the above, The upper portion 42330 comprises a first cam member configured to cammingly engage the first jaw 42240 of the end effector 42200 during a firing stroke, and the lower portion 42340 comprises a second cam member configured to cammingly engage the second jaw 42210 of the end effector 42200 during the firing stroke. As such, the first cam member and the second cam member are configured to approximate the first jaw 42240 and the second jaw 42210 of the end effector 42200 during the firing stroke. In the illustrated embodiment, the first jaw 42240 comprises a movable anvil, and the second jaw 42210 comprises an elongate channel configured to receive a staple cartridge 42220. The anvil 42240 is movable relative to the elongate channel 42210 between an open position and a closed position. Further, the firing member 42300 is configured to move a sled 42230 of the staple cartridge 42220 through the end effector 42200 to eject staples from the staple cartridge 42220.
In use, as the firing member 42300 distally advances from the unfired position depicted in
The upper portion 42330 and the lower portion 42340 are capable of separating or moving farther apart vertically during the firing stroke. For example, when the anvil 42240 is in its closed position and the firing stroke has commenced, forces due to staple firing, cutting, and/or patient tissue may deflect or move the anvil 42240 away from the elongate channel 42210. The expansion of the distal head portion 42320 can accommodate such movement or deflection. In certain instances, the expansion of the firing member 42320 can accommodate entry of the upper cam member on the upper portion 42330 into an anvil channel of the anvil 42200 if the anvil channel is misaligned. Further, the expansion of the distal head portion 42320 is limited by the distally-protruding lower foot 42334 and the proximally-protruding upper foot 42342, which are drawn closer together to close the space 42400 therebetween and eventually engage one another to limit the extent of expansion of the distal head portion 42320.
Further to the above, after the distal head portion 42320 has been distally advanced and expanded, the distal head portion 42320 can be retracted back to the home or unfired position illustrated in
Further to the above, the lower portion 42340 of the distal head portion 42320 comprises a cutout portion 42344 defined in the distal end of the lower portion 42340. The cutout portion 42344 is configured to receive a proximal nose portion 42232 of the sled 42230 therein. As such, a distal advancement of the distal head portion 42320 will advance the sled 42230 through the staple cartridge 42220 to eject the staples. Further, the distal head portion 42320 comprises a knife portion 42332 configured to sever the tissue of a patient during the firing stroke.
Further to the above, the elongate channel 43220 is configured to receive a staple cartridge 43230 therein. The staple cartridge 43230 comprises a proximal cartridge tail 43232 with substantially flat portions on both sides of a cartridge slot 43234. Typically, the cartridge tail 43232 is configured to interact with the landing portions 43212 of the anvil 43210 when the anvil 43210 is in its closed position. In the illustrated embodiment, the low durometer material 43214 acts as a semi-compressible material between the landing portions 43212 of the anvil 43210 and the cartridge tail 43232. As such, the anvil 43210 is capable of floating relative to the staple cartridge 43230 in response to the forces exerted by the closure system and/or the firing system. Specifically, due to the compressible nature of the low durometer material 43214, the anvil 43210 can flex and/or deflect relative to the staple cartridge 43230 more than would be possible without the low durometer material 43214 present on the landing portions 43214.
Other embodiments are envisioned where the low durometer material 43214 is defined as part of the anvil 43210 and flush with the landing portions 43212 of the anvil 43210. In such an arrangement, the low durometer material 43214 may allow for over-closing of the anvil 43210 relative to the staple cartridge 43230. Specifically, a firing member engages the anvil slot 43216 and the elongate channel 43220 to close the anvil 43200 relative to the staple cartridge 43230 during an initial closing operation. During the initial closing operation of the anvil 43200, the compressible low durometer material 43214 flush with the landing portions 43212 can abut and cause interference with the rigid cartridge tail 43232 of the staple cartridge 43230. Because the low durometer material 43214 is compressible, the proximal portion of the anvil 43200 is capable of flexing to overcome the interference between the landing portions 43212 and the cartridge tail 43232. As the firing member advances through the staple cartridge 43230, the low durometer material 43214 may further compress against the rigid cartridge tail 43232. The two surfaces 43214, 43232 can move past the point of interference to allow the firing member to complete the firing stroke without binding.
Further to the above, the low durometer material 43214 may be more compressible than the anvil 43210 and/or the cartridge 43230. Further, the low durometer material 43214 may reduce the forces on a firing member which travels through the anvil 43210 and the staple cartridge slot 43234. Specifically, a firing member with an upper and lower cam member, such as those described herein, can move within the end effector 43200. For example, the upper cam of the firing member moves through anvil slot 43216. Due to the compressibility of the low durometer material 43214, the anvil slot 43216 can flex relative to the staple cartridge 43230. As such, less force will be exerted on the upper cam member of the firing member during closing and/or firing as compared to if the low durometer material 43214 were not present.
Further to the above, embodiments are envisioned which incorporate the low durometer material 43214 and the expanding firing members 41000, 42320 of
In various embodiments, firing members, (e.g., I-beams or E-beams) can be constructed to have complex 3D printed geometries incorporated into the main body, which can act as a spring and allow the upper cam portion to flex and move with the anvil ledge to an angle of reduced or least resistance. Such geometric complex printed structures allow for metamaterial behaviors. For example, a metal I-beam could have portions that act as a solid metal structure and alternative portions having geometries that are designed to allow for greater bending and/or stretching to permit the I-beam to focus its deflection in a location and/or orientation to align the I-beam to the use and/or load. Exemplary embodiments of such I-beams are discussed in greater detail below.
Further to the above, the body portion 44100 comprises a longitudinal opening 44110 extending through the body portion 44100 and defining a longitudinal axis LA. The body portion 44100 further comprises a distal nose portion 44130 extending distally from the body portion 44100. The longitudinal opening 44110 is configured to receive a rotary firing driver, such as firing screw 261 (see, e.g.
Further to the above, the firing member 44000 further comprises flexible portions 44160 positioned intermediate the body portion 44100 and the pair of upper cam members 44140. In other words, the flexible portions 44160 attach at least a portion of the upper cam members 44140 to the body portion 44100. As can be seen in
Further to the above, as can be seen in
Further to the above, in at least one embodiment, the firing member 44000 may be constructed using a 3D printing process. Infill and solid wall parts are traditionally used to fabricate objects that are lightweight and strong. 3D printed parts are manufactured with a specific infill percentage. The printing process uses a crosshatch or other pattern for interior surfaces to form cells within the infill portion of the 3D printed part. The density of this pattern is referred to as the infill percentage. For example, it is common to have 1-2 mm thick walls, and to have 25-35% of the part solid inside of the walls. When building parts with powder based processes, such as 3D printing, it is important to note that powder must have escape holes to ensure powder reclamation after the part is fabricated. Infill for parts can be 2D like a honeycomb, or 3D like a gyroid. Different patterns have different strength profiles. For example, patterns with larger cells can be more flexible than patterns with smaller cells. Due to the freedom of geometry, the geometry can be variably thickened and thinned to ensure that flexion can occur at a desired location and a desired amount.
Different geometries and infill percentages could be used at different locations in the firing member 44000 to achieve different degrees of deformation and/or predispositions to different directions of deformation. In certain instances, the leading end of the upper cam portion 44140 can have a different infill percentage or infill matrix/geometry than adjacent portions of the firing member 44000 to maintaining the rigidity of the proximal end of the upper cam member 44140, as depicted in
Further to the above, the body portion 45100 comprises a longitudinal opening 45110 extending through the body portion 45100, similar to the longitudinal opening 44110 (see
Further to the above, the firing member 45000 further comprises a flexible portion 45160 positioned intermediate the upper cam members 45140 and the lower cam members 45150, 45210. The flexible portion 45160 comprises a first plurality of arcuate slots 45170 extending laterally through the body portion 45100, and a second plurality of arcuate slots 45180 extending laterally through the body portion 45100. In the illustrated embodiment, the first plurality of arcuate slots 45170 are curved in a direction which resembles a backward C-shape, and the second plurality of arcuate slots are curved in the opposite direction which resembles a forward C-shape. However, other embodiments are envisioned with different curvatures or combination of curvatures for the arcuate slots 45170. Further, in the illustrated embodiment five first arcuate slots 45170 and five second arcuate slots 45180 are depicted, however, other embodiments are envisioned with more or less than five arcuate slots for each of the first plurality or arcuate slots 45170 and each of the second plurality of arcuate slots 45180.
In any event, the body portion 45100 further comprises a first cutout region 45175 on its distal end that is defined by the first plurality of arcuate slots 45170, and a second cutout region 45185 on its proximal end that is defined by the second plurality of arcuate slots 45180. The arcuate slots 45170, 45180 and the cutout regions 45175, 45185 permit the firing member 45000 to flex and/or deflect when a load is applied to the firing member 45000, as discussed in greater detail below.
Referring primarily to
Further to the above, due to the lateral force F applied to the upper cam members 45140, the upper cam members 45140 rotate in a clockwise direction which causes the flexible portion 45160 and the body portion 45100 to flex and/or deflect to enable the firing member 45000 to change shape based on the load applied. Specifically, the first plurality of arcuate slots 45170 are configured to stretch and the second plurality of arcuate slots 45180 are configured to compress when the lateral force F is applied. Moreover, the first cutout region 45175 elongates and the second cutout region 45185 compresses when the lateral force F is applied. As such, the firing member body 45100 can flex and/or deflect to accommodate the lateral force F.
Further to the above, during use, the upper cam members 45140 are configured to ride along the anvil ledge 45300 within a longitudinal anvil slot. Upon initial entry of the upper cam members 45140 into the anvil slot, the upper cam members 45140 may be misaligned due to the varying amounts of tissue (i.e., thick and thin tissue) grasped between the jaws. As such, the flexible portion 45160 permits the upper cam members 45140 to flex and/or deflect to properly align the upper cam members 45140 with the anvil slot, for example. Further, the varying amounts of tissue grasped between the jaws may cause the anvil ledges 45300 to move away from the elongate channel 45400 during a firing stroke of the firing member 45000. As such, the upper cam members 45140 may become misaligned with the anvil slot during firing. However, the flexible portion 45160 permits the upper cam members 45140 to flex and/or deflect to compensate for the varying amounts of tissue to prevent the upper cam members 45140 from jamming within the anvil slot when the upper cam members 45140 are not properly aligned within the anvil slot.
Further to the above, in at least one embodiment, the firing member 45000 can comprise a longitudinal slot extending through the flexible portion 45160 to permit one lateral side of the firing member 45000 to flex at least partially independent of another lateral side of the firing member 45000. The longitudinal slot may be similar to longitudinal slot 46170 (see
Further to the above, the body portion 46100 comprises a longitudinal opening 46110 extending through the body portion 46100 and defining a longitudinal axis LA. The longitudinal opening 46110 is configured to receive a rotary firing driver, such as firing screw 261 (see, e.g.
Further to the above, the firing member 46000 further comprises a flexible portion, or lattice portion, 46160 positioned intermediate the upper cam members 46150 and the lower cam members 46150. In the illustrated embodiment, the lattice portion 46160 is bifurcated by a longitudinal slot 46170 which extends parallel to the longitudinal axis LA. The longitudinal slot 46170 extends through the body portion 46100 from the proximal end to the distal end. As such, the lattice portion 46160 is divided into a first side 46180 and a second side 46190. The first side 46180 of the lattice portion 46160 comprises a plurality of slots 46182 oriented transverse to the longitudinal axis LA in a first direction. The second side 46190 of the lattice portion 46160 comprises a plurality of slots 46192 oriented transverse to the longitudinal axis LA in a second direction that is opposite the first direction. The plurality of slots 46182, 46192 reduce the overall cross-sectional density of the firing member 46000 within the lattice portion 46160. In other words, the lattice portion 46160 is less dense (e.g. lower infill percentage) than the adjacent portions of the body portion 46100 of the firing member 46000. Further, the longitudinal slot 46170, which bifurcates the lattice portion 46160, permits the first side 46180 of the lattice 46160 to slide past the second side 46190 of the lattice 46160, and vice versa, and/or permits the first side 46180 of the lattice 46160 to stretch vertically while the second side 46190 is compressed vertically, or vice versa. Without the longitudinal slot 46170, sliding and deflection of the first and second sides 46180, 46190 relative to one another would be limited.
Further to the above, the first side 46180 comprises a notch 46185 on the proximal end of the body portion 46100, and the second side 46190 comprises a notch 46195 on the proximal end of the body portion 46100. The notches 46185, 46195 provide greater flexion and/or deflection of the proximal end of the body portion 46100 as compared to the distal end of the body portion 46100. Moreover, in the illustrated embodiment, the notches 46185, 46195 are positioned on the proximal end of the body portion 46100. However, other embodiments are envisioned where the notches 46185, 46195 are positioned on the distal end of the body portion 46100 for the opposite effect. Further still, other embodiments are envisioned with notches on the proximal and distal ends of the body portion 46100, see
In use, when the firing member 46000 is advanced into an end effector, the upper cam members 46140 engage an upper jaw, or anvil of the end effector, and the lower cam members 46150, 46210 engage a lower jaw, or elongate channel of the end effector. As such, the lattice portion 46160 is configured to permit the upper cam members 46140 and the lower cam members 46150, 46210 to flex and/or deflect relative to the body portion 46100 to accommodate lateral forces during the firing stroke.
The body portion 46100 and the lattice portion 46160 can be constructed of varying geometries and materials to accommodate a desired stress profile within the firing member 46000 during the firing stroke. For example, the firing member 46000 can be constructed using 3D printing, or an equivalent process. In at least one embodiment, the body portion 46100 is 3D printed as a unitary piece with the body portion comprising a first material and the lattice portion 46160 comprising a second material that is different from the first material. Further, the first material may comprise a first density and the second material can comprise a second density that is different from the first density.
Further to the above, 3D printing generally produces structures that have some amount of open space (i.e., they are not completely solid on a micro level). As discussed above, the 3D printing process uses a crosshatch or other pattern for interior surfaces housed within more solid wall structures. The density of this pattern within the solid walls is referred to as the infill percentage. The infill percentage can be varied throughout the 3D printing process to produce a component having different infill percentages for different portions of the component. If different infill portions comprise different infill percentages, they inherently comprise different densities on a micro level. In other words, the different infill portions can be varied to produce different micro densities within a component.
Further to the above, other embodiments are envisioned where the infill percentage is uniform throughout the entire part. In such instances, flexibility can be built into the part from macro-geometry aspects, such as slots, cutouts, holes etc. upon which the 3D build is built around. For example, the firing member 46000 may comprise an entirely uniform infill percentage. In such an instance, the slots 46182, 46192 define bar structures in between the slots 46182, 46192, and the bar structures would comprise the same infill percentage as the rest of the firing member 46000, for example.
In the illustrated embodiment, the force applied is imparted onto an upper member 49100 of the flexible member 49000 while a base 49120 of the flexible member 49000 is held stationary. The upper member 49100 and the base 49120 are connected by a first vertical member 49130 and a second vertical member 49140 which crisscross to form an X-configuration. In use, when a force is applied to the upper member 49100, the upper member 49100 transitions to a deflected state 49110′, the first vertical member 49130 transitions to a deflected state 49130′, and the second vertical member 49140 transitions to a deflected state 49140′. The first and second vertical members 49130, 49140 can be deflected to accommodate various loads applied to the upper member 49100.
It should be appreciate that any of the discrete features of the flexible portions 44160, 45160, 46160, 48160, 49000 can be used in combination with each other. For example, the flexible portions 44160 positioned between the upper cam member 44140 and the body portion 44100 may be incorporated into the firing members 45000, 46000, and/or 48000. Moreover, the flexible portions 44160 may be incorporated into any of the lower cam members of firing members 44000, 45000, 46000, 48000, 49000 to provide for greater flexion of the lower cam members in certain instances.
3D printing may be utilized in a similar approach for various instrument components described herein, among others. For example, to accommodate a rotary drive screw in an elongate channel of a surgical instrument, the elongate channel may comprise a distal support bearing or support washer to support the distal end of the rotary drive screw. In at least one embodiment, the distal support bearing could be 3D printed to include a compressible portion that, when compressed in a first direction expands in a second direction that is transverse to the first direction to increase the bearing surface between the distal support bearing and the rotary drive screw. As a result, the coupling between the rotary drive screw and the distal support bearing is improved in certain instances due to a decrease in the bearing loads achieved by increasing the bearing surface area.
Channel retainers and various end effector components are subject to high deflection and longitudinal loads during operation of a surgical instrument. Standard materials for these components consist of aluminum and stainless steel which have limited stretch and deflection capabilities. For example, 250 to 300 pounds of force can be applied longitudinally to a channel retainer during a surgical actuation and an acceptable longitudinal flex can be less than 0.08 inches.
A composite component can include different materials for different portions to obtain complex part geometries, such as interlocking features, alignment keyways, or open sliding passages, for example, with a first material (e.g. plastic) while also maintaining appropriate strength, stiffness, and/or rigidity with a second material (e.g. metal) to support the longitudinal stress and strain loads during a surgical actuation. Metal portion(s) in a composite component can be flexible in one plane but rigid or stiff in another. For example, metal portions can permit lateral flexing but limit longitudinal stretching. Moreover, plastic material can act as a gap filler and interlocking substance between the metal substrates, while also allowing feature-rich, complex geometries. For example, a low durometer or flexible material such as plastic may be used as a body portion for an end effector component. The plastic body portion can comprise metal substrate portions defined therein to bear the loading forces during operation while the plastic body provides keying and alignment features. Such a laminate component can be constructed with 3D printed plastic and metal substrate inserts.
For example, a channel retainer for use with a surgical device can comprise a first metal substrate, a second metal substrate interlocking with the first metal substrate, and a plastic portion built around the first metal substrate and the second metal substrate. The channel retainer is positioned between a handle and an end effector of the surgical device. Further, the channel retainer can comprise alignment and connection features built into the plastic body to facilitate attachment to the surgical device.
Further to the above, the proximal end of the channel retainer 50000 comprises notches 50130 which facilitate attachment of the channel retainer 50000 to the handle and/or housing of a surgical instrument. The distal end of the channel retainer 50000 comprises notches 50120 which facilitate attachment of the channel retainer to an articulation joint and/or end effector of a surgical instrument. However, other embodiments are envisioned with different attachment features for connecting the channel retainer 50000 to the surgical instrument.
Further to the above, the channel retainer 50000 comprises a body portion 50100, first substrate portions 50300, and second substrate portions 50400. The channel retainer 50000 further comprises a longitudinal slot 50110 defined therein for receiving various actuators of a surgical instrument. For example, a firing member extending from a handle or housing of a surgical instrument can extend within the longitudinal slot 50110. In any event, the longitudinal slot 50110 splits the channel retainer 50000 in half with the first and second substrate portion 50300, 50400 positioned on each side of the slot 50110 (i.e., the channel retainer 50000 is symmetrical). In at least one embodiment, the body portion 50100 is 3D printed with the first and second substrate portions 50300, 50400 defined therein. In other words, the body portion 50100 is built around the first and second substrate portions 50300, 50400. In at least one embodiment, the body portion 50100 is comprised of plastic and the substrate portions 50300, 50400 are comprised of metal. The substrate portions 50300, 50400 can be comprised of stamped metal plates, for example. Other embodiments are envisioned where the substrate portions 50300, 50400 comprises materials that are more rigid and/or dense than the body portion 50100, for example.
As illustrated in
These substrates can form a multi-interlocking load sharing assembly comprised of stamped components within the 3D-printed assembly. In certain instances, interlocking of stamped components within a 3D-printed assembly can be utilized to combine components where injection molding is not a viable alternative due to the shrinking of the composite material over elongated metal components during a molding process, which can result in a buildup of internal stresses and shear features within the assembly. For example, elongate assemblies, such as channel retainers, for example, may be better suited to 3D printing around interlocking metal components.
Further to the above, each of the first substrate portions 50300 comprise a second lateral flange 50320 positioned at their proximal end and extending away from the longitudinal slot 50110. The second lateral flanges 50320 are built and/or embedded into the body portion 50100 such that they extend behind the proximal notches 50310 defined in the body portion 50100. As such, the first substrate portions 50300 are at least partially restricted from moving longitudinally within the body portion 50100 due to their engagement with the proximal notches 50310. Further, the alignment notches 50310 may be used to attach and align the channel retainer 50000 within a handle or housing of the surgical instrument. As such, the first substrate portions 50300 within the proximal end provide additional support to the channel retainer 50000 to facilitate attachment to a surgical instrument. Other embodiments are envisioned with the first substrate portions 50300 at both the proximal and distal ends to facilitate attachment to a surgical device. In at least one embodiment, the body portion 50100 comprises a keying feature, an alignment feature, and/or an interlocking feature for use with a surgical instrument.
The first and second substrate portions 50300, 50400 can comprise more rigid metallic materials to bear the loading and stretch forces that the channel retainer 50000 experiences during operation of the surgical instrument.
Further to the above, the first substrate portion 50300 and/or the second substrate portion 50400 comprise flexible circuit boards and/or other integrated electronics supported or affixed thereto. During manufacture, the 3D printing material of the body portion 50100 can be overprinted around the substrate portions 50300, 50400 without directly affixing the build material to the electronics of the substrate portions 50300, 50400. By preventing direct application of the 3D build material onto the substrate portions 50300, 50400, the risk of damage to the substrate portions 50300, 50400 and their electronic components is reduced. For example, referring primarily to
As discussed above, the channel retainer 50000 may be constructed via 3D printing. For example, before the 3D build begins, metal substrates such as substrate portions 50300, are introduced upon which the 3D plastic build will be attached. Partially through the 3D build, the build could be stopped with standing alignment features to permit the creation of a perimeter build flange. The perimeter build flange allows for the introduction of another mid-substance metallic support plate, or substrate portions 50400, for example. In at least one embodiment, the substrate portions 50300, 50400 can be aligned in such a manner as to have coupling plastic features (such as notches 50130, for example) that prevent movement of the substrates 50300, 50400 within the body portion 50100 while also preventing shear of the body portion 50100. In at least one embodiment, the channel retainer 50000 is a sandwiched laminate comprised of metal plates with 3D plastic printed coupling and assembly features. The metal plates are capable of bearing the load and stretch properties and the 3D printed elements are configured to provide all the keying, aligning, lateral support, and interlocking features with adjacent systems. 3D printing a channel retainer in this manner enables complex plastic interface features to be affixed to load bearing metallic sub-frames within and around the 3D built part.
Further to the above, a steel stamped part could have a lateral flange bend in both ends for affixing to an elongate shaft and/or an articulation joint of a surgical instrument. The flanges could be laid into the 3D printer with the flanges away from the printing head path. The 3D build is then continued to form the rest of the channel retainer. As such, the lateral flange bends extend from the 3D printed channel retainer for attachment to the surgical instrument. In other words, the lateral flange bends are not overprinted with 3D printing material, extend from the 3D printed material, and are attachable to the surgical instrument.
Further to the above, other embodiments are envisioned with a 3D printed laminate construction comprising a plastic body and metal substrates for various end effector components. For example, a staple cartridge, an elongate channel configured to receive a staple cartridge, and/or an anvil, could be constructed as a 3D printed laminate with plastic and metallic materials. As such, embodiments are envisioned where other end effector components utilize a plastic body for all of the keying and alignment features while the metal substrates bear the stretch and deflection loads during operation.
Further to the above, with traditional insert molded parts creating undercuts, interior voids, interior spaces, and/or features transverse to the parting line of the mold (e. more than 3 degrees from the parting axis of the mold) may be difficult and costly to manufacture in certain instances. The 3D-printed plastic body discussed above, can comprise undercuts, interior voids, and/or transverse alignment features for connecting components, for example.
The firing bar support 51020 is defined within the over-molded sleeve 51030 that extends along the articulation joint of the surgical instrument 51000. In other words, the over-molded sleeve 51030 encompasses and/or encapsulates the firing bar support 51020 therein. In at least one embodiment, the over-molded sleeve 51030 may be a plastic 3D printed material built around the firing bar support 51020 to embed and/or encapsulate the firing bar support 51020 therein. As such, the over-molded sleeve 51030 and the firing bar support 51020 comprise a substantially unitary piece. Further, the unitary piece formed of the over-molded sleeve 51030 and the firing bar support 51030 comprises a longitudinal slot 51032 defined therein. The longitudinal slot 51032 is configured to receiving the firing bar 51010 to permit translation of the firing member 51010 therein.
In at least one embodiment, the compliant portion 52050 comprises a more compressible material than the remainder of the anvil 52000. For example, the compliant portion 52050 can comprise a material that is less dense or softer (i.e., a smaller number on Mohs hardness scale) than the remainder of anvil 52000 material. In at least one embodiment, the compliant portion 52050 can be comprised of brass or bronze and the remainder of the anvil 52000 can be comprised of stainless steel. In any event, the upper pins or upper cam members of a firing member (i.e., an I-beam or E-beam) can ride along the compliant portion 52050 during firing. As such, the body of the anvil 52000 is more rigid with the anvil slot 52040 being softer and/or more compliant to facilitate more give to the firing member during firing. Further, the compliant portion 52050 may be smoother than the remainder of the anvil 52000 to further facilitate sliding of the upper pins of the firing member within the anvil slot 52040.
Further to the above, the anvil 52000 may be constructed using 3D printing to position the compliant portion 52050 within the body of the anvil 52000. For example, the 3D printer could begin by building up stainless steel from the tissue contacting surface 52020 upward. The 3D build could be stopped to insert the compliant member 52050, and then the build continued to encapsulate the compliant member 52050 within the stainless steel 3D print material of the anvil 52000. As such, the compliant member 52050 and the anvil 52000 can be 3D printed to produce a substantially unitary piece having two different materials. Other embodiments are envisioned with more than two materials 3D printed into the anvil 52000.
Various forms of additive manufacturing systems are known for manufacturing components from sinterable building materials, for example.
By way of non-limiting example, the additive manufacturing system 60100 comprises a printer 60120 that may include a fused filament fabrication system, a binder jetting system, a stereolithography system, a selective laser sintering system, or any other system that can be usefully adapted or employed to form a universally movable joint 60200 described herein under computer control from or out of a build material 60130. In at least one form, the build material 60130 may comprise sinterable materials commonly employed with such printers. For example, in accordance with various aspects of the present disclosure, the build material 60130 may comprise 316 stainless steel, 17-4 stainless steel, Ti-64 titanium, etc. As will be discussed in further detail below, various other forms of build materials (metal and non-metal) may also be employed.
In one aspect, the additive manufacturing system 60100 may comprise a computer system 60125 that is configured to generate a computer aided design (CAD) three dimensional file of the universally movable joint 60200. The CAD file data may then be sliced into layers forming a two dimensional image of each layer. This file may then be loaded into a file preparation software package that assigns parameters, values, and physical supports that allow the file to be interpreted by the printer 60120. In a general form, the printer 60120 may comprise a build chamber 60122 that includes a build plate or platform 60124 and a laser 60126. In accordance with one non-limiting aspect, the build chamber 60122 may further include a material dispensing platform (not shown) and a re-coater member (not shown) that is used to move new build material 60130 over the build plate 60124. In at least one arrangement, the build material 60130 is commonly in powered form (“first state”) and the laser 60126 fuses the powdered build material 60130 into a solid part (“second state”) by melting it locally using the focused laser beam. For example, the component portions of the universally movable joint 60200 may be built up additively, layer by layer.
Support structures may be required in many additive manufacturing processes to dissipate heat away from the printed component and into the build plate as well as to support the component throughout the manufacturing process. Overhanging features of a printed component generally have no underlying solid layer to support them at any point. Such overhanging features may therefore be more prone to deformation during manufacturing caused by gravity, internal heat, and residual stresses. In such instances, to avoid this deformation, support structures may be employed to support those overhanging features during the additive manufacturing process. While such support structures are useful for these reasons, they must be removed from the formed component or part after the process is completed. This results in wasted material and can lead to increased manufacturing costs.
In one non-limiting example, the additive manufacturing system 60100 may include a conveyor 60140 for transporting a printed “green” universally movable joint 60200G to a post-processing station 60150. As used in this context, the term “green” may refer to a condition of the universally movable joint 60200 wherein one or more component portions thereof lacks one or more of the following attributes: (i) final desired composition, (ii) final desired strength, (iii) final desired dimension(s), (iv) final desired shape, (v) final desired density, and/or (vi) final desired finish, for example. The conveyor 60140 may be any suitable mechanism or combination of devices suitable for physically transporting the green universally movable joint 60200G. This may, for example, include a robotics and a machine vision system or the like on the printer side for detaching the green universally movable joint 60200G from the build plate 60124, as well as robotics and a machine vision system or the like on the post-processing side to accurately place the green universally movable joint 60200G within the post-processing station 60150. In another aspect, the green universally movable joint 60200G may be manually transported between the two corresponding stations.
The post-processing station 60150 may be any system or combination of systems useful for converting the green universally movable joint 60200G into the desired net final shape, net final dimension, net final density, net final strength and/or net final finish, for example. The post-processing station 60150 may also or instead, for example, include a de-binding station such as a chemical de-binding station for dissolving binder materials in a solvent or the like, or more generally, any de-binding station configured to remove at least a portion of the binder system from the various forms of build materials 60130. The post-processing station 60150 may, for example, also or instead include a thermal sintering station for applying a thermal sintering cycle at a sintering temperature for the build material 60130, or the powdered material in the build material 60130, such as a sintering furnace configured to sinter the powdered material into a densified object. The post-processing station may also or instead comprise a heat treating station. The post processing station may also or instead comprise a system for removing unformed build material and/or support material using a variety of different mediums including, but not limited to, liquids, solvents, air pressure, gravity, etc.
Further, a wide range of sintering techniques may be usefully employed by the post-processing station 60150. In one aspect, the green universally movable joint 60200G may be consolidated in a furnace to a high theoretical density using vacuum sintering, for example. In another aspect, the furnace may use a combination of flowing gas (e.g., at below atmosphere, slightly above atmosphere, or some other suitable pressure) and vacuum sintering. More generally, any sintering or other process suitable for improving object density may be used, preferably where the process yields a near-theoretical density part with little or no porosity. Hot-isostatic pressing (“HIP”) may also or instead be employed, e.g., by applying elevated temperatures and pressures as a post-sintering step to increase density of the final part. In another aspect, the universally movable green joint 60200G may be processed using any of the foregoing, followed by a moderate overpressure (greater than the sintering pressure, but lower than HIP pressures). More generally, any technique or combination of techniques suitable for removing binder systems and driving a powdered material toward consolidation and densification may be used by the post-processing station 60150 to process a fabricated universally movable joint 60200 as contemplated herein.
The post-processing station 60150 may also or instead comprise machining operations configured to remove support structure(s) (if any) and/or machine the component portions of the green universally movable joint 60200G that have been printed within “near net” dimensions to provide the joint components with final desired dimensions and shapes. The post-processing station 60150 may also or instead include a Directed Energy Deposition (DED) process which in one form may comprise a three dimensional (3D) printing method that employs a focused energy source, such as a plasma arc, laser or electron beam to melt a material which is simultaneously deposited by a nozzle. Such DED process may be used for example to repair or add additional material to a green universally movable joint 60200G or finished universally movable joint 60200. The post-processing station 60150 may also or instead comprise various grit blasting and/or polishing operations for attaining a desired final surface finish of the universally movable joint 60200.
Still referring to
In accordance with another aspect of the present disclosure, the horizontal U-joint 60500 in at least one form comprises a first horizontal “wishbone” or joint cap 60510 that is rotatably journaled on the first horizontal axle segment 60330 and a second horizontal “wishbone” or joint cap 60520 that is rotatably journaled on the second horizontal axle segment 60340. The horizontal U-joint 60500 further comprises a U-shaped horizontal bridge 60530 (
Turning to
Still referring to
Similarly, the second horizontal joint cap 60520 comprises a second hub portion 60522 that comprises a second hub inner surface 60524 and a second cap portion 60526 that defines a second tapered end surface 60528. The second hub inner surface 60524 is spaced from an outer surface 60342 of the second horizontal axle segment 60340 and the second tapered end surface 60528 is spaced from the second conical end portion 60344 to define a second horizontal joint space 60346 that extends between the second horizontal joint cap 60520 and the first horizontal axle segment 60340 and the first conical end portion 60344. The second horizontal joint space 60346 opens through a second hole 60529 in the second cap portion 60526.
As can also be seen in
During the printing process or formation process, the joint spine 60300 extends from the built plate 60124 and is formed vertically off the build plate 60124. The flared bottom end 60312 is formed off of the build plate 60124 and is attached thereto during formation. The flared bottom end 60312 serves to support the joint spine 60300 during the printing process. In one aspect, unformed build material 60130U around the flared bottom end 60312, the bottom joint ring 40410, the first horizontal joint cap 60510 and the second horizontal joint cap 60520, as well as the amounts of unformed build material 60130U in the spaces between the vertical U-joint 60400, the horizontal U-joint 60500, and the joint spine 60300 may further help to maintain the vertical orientation of the joint spine 60300 (and the universally movable joint 60200G) during the forming process without the use of support members between the joint components and the build plate 60124. In such arrangement, the flared bottom end 60312 facilitates thermal dissipation into the build plate 60124. The bottom joint ring 60410 is formed without being attached to the build plate 60124. In accordance with at least one aspect, universally movable joints 60200 having an overall diameter of as small as approximately 4 mm may be formed in such a manner. Joints with larger diameters, for example, of approximately 10 mm or more may require one or more support members to support the joint components in a vertical orientation during the printing process. In any event, once the amounts of unformed (i.e., still in a first state or powder form or unsolidified) build material 60130U are removed from between the joint components, the vertical U-joint 60400 is freely rotatable on the joint spine 60300 about the vertical axis VA-VA and the horizontal U-joint 60500 is freely rotatable about the joint spine 60300 about the horizontal axis HA-HA. In addition, the vertical U-joint 60400 and the horizontal U-joint 60500 cannot be removed from the joint spine 60300 without damaging the universally movable joint 60200.
Other non-limiting systems and processes are contemplated wherein a universally movable joint 60200 is formed from different build materials and different support materials. For example,
The various forms of universally movable joints 60200, 60200′, 60200″ represent vast improvements over prior joint arrangements that have been employed in various drive shafts and/or articulation joints of surgical instruments. The universally movable joints 60200, 60200′, 60200″ comprise a compact “integral” design that may avoid many of the challenges and increased costs associated with assembling other multiple part shaft/joint arrangements that may be employed in many surgical devices. The design of each of the universally movable joints 60200, 60200′, 60200″ minimize/eliminate unsupported horizontal surfaces, which could otherwise lead to increased surface roughness and component warping. The universally movable joints 60200, 60200′, 60200″ may be printed from metal build material and exhibit strength characteristics that are comparable to or exceed the strength characteristics of multiple part joints that are machined from similar metal material and assembled together with pins, screws, welding, etc. The present joint designs further minimize and, in many cases, eliminate the need for numerous, elaborate support members during the printing process and can also reduce post-processing operations and/or costs.
In the non-limiting example illustrated in
Still referring to
As can be further seen in
Articulation link assemblies 61300B and 613000 are similar in design to the articulation link assembly 61300A described in detail above. As can be seen in
Still referring to
To facilitate articulation of the end effector, at least two and preferably four flexible articulation actuators (not shown) are attached to the distal mounting member and movably extend through openings in the proximal mounting member to communicate with an articulation control system supported in or by the housing or robotic system. For example, the flexible articulation actuators may comprise flexible cables configured in the various manners contemplated herein and described in further detail below. Other suitable articulation drive systems may be employed.
In the non-limiting example illustrated in
Still referring to
As can be further seen in
Articulation link assemblies 64300B and 643000 are similar in design to the articulation link assembly 64300A described in detail above. As can be seen in
Still referring to
To facilitate articulation of the end effector, at least two and preferably four flexible articulation actuators (not shown) are attached to the distal mounting member 64200 and movably extend through openings in the proximal mounting member 64100 to communicate with an articulation control system supported in or by the housing or robotic system. For example, the flexible articulation actuators may comprise flexible cables configured in the various manners contemplated herein and described in further detail below. Other suitable articulation drive systems may also be employed.
The mounting member 67100 includes a shaft hole 67110 configured to permit various drive shafts and/or other instrument components to pass therethrough. In one non-limiting arrangement, each slot 67120 opens into the shaft hole 67110.
Returning now to the surgical stapling assembly 400 illustrated in
In one non-limiting arrangement for example, the closure drive comprises a proximal closure drive shaft portion 68002 that extends through the outer shaft 411 of the shaft assembly 410 and operably interfaces with a source of rotary closure motions supported in or by the housing or robotic system. The closure drive may further comprise an intermediate closure drive shaft portion that bridges the articulation joint(s) and a distal closure drive shaft portion that is supported in the end effector 200. In one arrangement, the proximal portion may comprise a rigid shaft segment, a flexible shaft segment, or a combination of rigid and flexible segments, for example. In one non-limiting arrangement, the intermediate closure drive shaft portion may comprise one universally movable joint (60200) or a series of movable joints or universally movable drive shaft segment (60700) that spans the articulation joint(s). The distal closure drive shaft portion may comprise a closure drive shaft arrangement supported in the end effector to apply opening and closing motions to the anvil in the various manners disclosed herein.
Similarly, the firing drive may comprise a proximal firing shaft portion that extends through the outer shaft 411 of the shaft assembly 410 and operably interfaces with a source of rotary firing motions supported in or by the housing or robotic system. The firing drive may further comprise an intermediate firing drive shaft portion that bridges the articulation joint(s) and a distal firing drive shaft portion that is supported in the end effector 200. In one arrangement, the proximal firing drive shaft portion may comprise a rigid shaft segment, a flexible shaft segment, or a combination of rigid and flexible segments, for example. In one non-limiting arrangement, the intermediate firing drive shaft portion may comprise one universally movable joint (60200) or a series of movable joints or universally movable drive shaft segment (60700) that spans the articulation joint(s). The distal firing drive shaft portion may comprise a firing drive shaft arrangement supported in the end effector to apply drive motions to the firing member 270 in the various manners disclosed herein.
The proximal closure drive shaft 68010 may comprise a rigid shaft segment, a flexible shaft segment (e.g., torsion cable, etc.) or a combination of rigid and flexible segments, for example. The proximal closure drive shaft 68010 may operably interface with a source of rotary closure motions (e.g., a motor, etc.) that is operably supported by or in a housing or portion of a robotic system, for example. In the illustrated arrangement, the proximal closure drive shaft 68010 comprises a bulbous distal end 68012 that is received in a proximal socket 68120 in the proximal end 68114 of the closure coupler member 68110. The bulbous distal end 68012 of the proximal closure drive shaft 68010 is pivotally coupled to the proximal end 68114 of the closure coupler member 68110 by a proximal closure pin 68130 that is received in an X-shaped passage 68014 in the bulbous distal end 68012 of the proximal closure drive shaft 68010. It will be appreciated that the X-shaped passage 68014 facilitates some pivotal travel between the proximal closure drive shaft 68010 and the closure coupler member 68110.
The closure coupler member 68110 is operably coupled to a distal closure drive shaft 68300 which comprises the closure drive shaft segment 475 depicted in
The proximal firing drive shaft 68020 may comprise a rigid shaft segment, a flexible shaft segment (e.g., torsion cable, etc.) or a combination of rigid and flexible segments, for example. The proximal firing drive shaft 68020 may operably interface with a source of rotary firing motions (e.g., a motor, etc.) that is operably supported by or in a housing or portion of a robotic system, for example. In the illustrated arrangement, the proximal firing drive shaft 68020 comprises a bulbous distal end 68022 that is received in a proximal socket 68520 in the proximal end 68514 of the firing coupler member 68510. The bulbous distal end 68022 of the proximal firing drive shaft 68020 is pivotally coupled to the proximal end 68514 of the firing coupler member 68510 by a proximal firing pin 68630 that is received in an X-shaped passage 68024 in the bulbous distal end 68022 of the proximal firing drive shaft 68020. It will be appreciated that the X-shaped passage 68024 facilitates some pivotal travel between the proximal firing drive shaft 68020 and the firing coupler member 68510.
The firing coupler member 68510 is operably coupled to a distal firing drive shaft portion 68600 which comprises the firing drive shaft segment 476 depicted in
Still referring to
In the illustrated arrangement, the distal firing drive shaft portion 68600 comprises the firing screw 261 screw that is rotatably supported the cartridge channel 210 by the channel mounting fixture 68700. The channel mounting fixture 68700 facilitates rotation of the firing screw 261 while preventing axial movement thereof. The firing screw 261 comprises a series of closure drive threads that threadably interface with a threaded passage in a threaded drive nut that is configured to operably interface with the firing member 270 or a threaded passage in the firing member 270 itself. Rotation of the firing screw 261 in a first rotary direction will cause the firing member 270 to axially move in a first axial direction and rotation of the firing screw 261 in a second rotary direction opposite to the first rotary direction will cause the firing member 270 to axially move in a second axial direction. For example, rotation of the firing screw 261 in a first rotary direction may cause the firing member 270 to axially move in a distal direction DD and rotation of the firing screw 261 in a second rotary direction may cause the firing member 270 to axially move in a proximal direction PD.
Still referring to
The proximal mounting flange 68722 as well as the coupler socket 68616, are freely rotatable in an opening 68724 defined in the cartridge channel 210 and the channel mounting fixture 68700. A socket flange 68618 is provided on a distal end of the coupler socket 68616 which serves to limit the proximal travel of the coupler socket 68616 when the socket flange 68618 contacts an end of the opening 68724. The firing coupler stem 68720 is sized relative to the coupler socket 68616 such that when the coupler socket 68616 has reached the limit of its proximal travel, the firing coupler stem 68720 remains in operable engagement with the coupler socket 68616 to prevent the firing screw 261 from becoming disconnected from the firing coupler shaft 68610.
The closure and drive shaft arrangements depicted in
Still referring to
In one aspect, the firing drive comprises a proximal firing drive shaft portion 69500 that extends through the outer shaft 411 of the shaft assembly 410 and operably interfaces with a source of rotary firing motions that is supported in or by the housing or robotic system. The proximal firing drive shaft portion 69500 may comprise, for example, another torsion cable 69502, laser-cut flexible shaft or another flexible rotary drive member, another rigid rotary drive member or a combination of another rigid rotary drive member and another flexible rotary drive member. As can be seen in
Still referring to
In the illustrated arrangement, the distal firing drive shaft portion 69700 comprises the firing screw 261 that is rotatably supported the cartridge channel 210 by the channel mounting fixture 68700. The channel mounting fixture 68700 facilitates rotation of the firing screw 261 while preventing axial movement thereof. The firing screw 261 comprises a series of closure drive threads that threadably interface with a threaded passage in a threaded drive nut configured to operably interface with the firing member 270 or a threaded passage in the firing member 270 itself. Rotation of the firing screw 261 in a first rotary direction will cause the firing member 270 to axially move in a first axial direction and rotation of the firing screw 261 in a second rotary direction opposite to the first rotary direction will cause the firing member 270 to axially move in a second axial direction.
Still referring to
As can be further seen in
Still referring to
In at least one arrangement, the shaft guide 69000 is fabricated from a bendable elastic or ductile material (e.g., polypropylene, low density polyethylene, liquid crystal polymer (LCP), Nylon, etc.) that facilitates twisting flexure of the shaft guide 69000 when the end effector 200 is articulated about at least one of the first articulation axis AA1-AA1 and the second articulation axis AA2-AA2. The shaft guide body 69010 comprises a central body portion 69012 that extends between the shaft guide proximal end 69020 and the shaft guide distal end 69030. In at least one non-limiting example, the central body portion 69012 comprises central bulbous portion 69014 which may further facilitate such flexure during articulation. Further, in at least one arrangement, the shaft guide body 69010 comprises a proximal necked down portion 69016 that is located between the central bulbous portion 69014 and the shaft guide proximal end 69020 and which essentially coincides with the first articulation axis AA1-AA1. The proximal necked down portion 69016 may be formed by a first pair of opposed proximal scallops 69017 that correspond to the first articulation axis AA1-AA1. See
As can be seen in
As can be seen in
In one instance, the first passage 69022 and the second passage 69026 twist as they go from the shaft guide proximal end 69020 to the shaft guide distal end 69030. The shaft guide 69000 comprises a support for the intermediate closure drive shaft portion 69300 and the intermediate firing drive shaft portion 69600 that avoids forming a preferred bend plane. The shaft guide 69000 spans two, in-series articulation joints of a multi-axis joint arrangement without forming a preferred bending orientation. In at least one arrangement, the multi-axis joint arrangement facilitates articulation of the end effector through two articulation angles about articulation axes AA1-AA1, AA2-AA2, that are each at least approximately 75 degrees in magnitude. The exterior profile of the shaft guide 69000 as well as each of the first passage 69022 and the second passage 69026 can twist to minimize its bending resistance by aligning its minimum moment of inertia plane to that of the articulation axes. In alternative arrangements, each of the first passage 69022 and the second passage 69026 may twist multiple times between the shaft guide proximal end 69020 and the shaft guide distal end 69030. In such instances, for example, each of the first passage 69022 and the second passage 69026 may pass through each of the first reference plane FRP and the second reference plane SRP multiple times.
In accordance with at least one aspect of the present disclosure, the proximal end 69027 of the second passage 69026 opens through the shaft guide proximal end 69020 in a “first orientation” relative to the proximal end 69023 of the first passage 69022. In the example illustrated in
To open and close the anvil jaw 203 relative to the cartridge jaw 201, a closure drive 250 is provided. See
To move the anvil jaw 203 between a clamped position and an unclamped position, the closure input shaft 72010 is actuated (rotated) to actuate (rotate) the flexible closure drive shaft 72000. The flexible closure drive shaft 72000 is coupled to the closure screw 251 by a coupler 72012 and is configured to rotate the closure screw 251, which displaces the closure wedge 255. For example, the closure wedge 255 is threadably coupled to the closure screw 251 and rotational travel of the closure wedge 255 with the staple cartridge 220 is restrained. The closure screw 251 drives the closure wedge 255 proximally or distally depending on which direction the closure screw 251 is rotated.
As discussed above, the surgical stapling instrument 70010 may be actuated to advance a firing member through the jaws 201, 203 to staple and cut tissue with the end effector 200. As was discussed above, staples that are stored in the staple cartridge 220 are deployed when a sled (not shown in
The firing member 270 is threadably coupled to the firing screw 261 such that as the firing screw 261 is rotated, the firing member 270 is advanced distally or retracted proximally along the firing screw 261. Specifically, the firing member 270 comprises a body portion 271 comprising a hollow passage 272 defined therein. The firing screw 261 is configured to be received within the hollow passage 272 and is configured to be threadably coupled with a threaded component 273 of the firing member 270. Thus, as the firing screw 261 is rotated, the threaded component 273 applies a linear force to the body portion 271 to advance the firing member 270 distally or retract the firing member 270 proximally. As the firing member 270 is advanced distally, the firing member 270 pushes the sled (not shown) that is movable supported in the staple cartridge 220. Distal movement of the sled causes the ejection of the staples by engaging the plurality of staple drivers, as described above. The flexible firing drive shaft 72100 is coupled to the firing screw 261 by a coupler 72112 and is configured to rotate the firing screw 251, which displaces the firing member 270.
Still referring to
In the non-limiting example illustrated in
Referring now to
In one non-limiting arrangement, articulation link member 71500A comprises a proximal link end 71510A, a link distal link end 71520A, and a link body 71530A. The proximal link end 71510A is coupled to the proximal mounting member 71100 at a first proximal attachment location 71120A by a first proximal joint assembly 71130A. In the illustrated example, the first proximal joint assembly 71130A comprises a pair of first proximal attachment lugs 71132A that protrude from the proximal mounting member 71100. A first proximal attachment link 71134A is pivotally coupled to the first proximal attachment lugs 71132A by a first proximal joint pin 71136A that defines a first proximal joint axis FPJA1. The first proximal attachment link 71134A is pivotally attached to the proximal link end 71510A by a second proximal joint pin 71138A that defines a second proximal joint axis SPJA2 that is transverse to the first proximal joint axis FPJA1 as well as the shaft axis SA-SA.
In the illustrated example, the distal link end 71520A is coupled to the distal mounting member 71300 at a first distal attachment location 71320A by a first distal joint assembly 71330A. In the illustrated example, the first distal joint assembly 71330A comprises a pair of first distal attachment lugs 71332A that protrude from the distal mounting member 71300. A first distal attachment link 71334A is pivotally coupled to the first distal attachment lugs 71332A by a first distal joint pin 71336A that defines a first distal joint axis FDJA1. The first distal attachment link 711334A is pivotally attached to the distal link end 71520A by a second distal joint pin 71338A that defines a second distal joint axis SDJA2 that is transverse to the first distal joint axis FDJA1 as well as the shaft axis SA-SA.
In one non-limiting arrangement, articulation link member 71500B comprises a proximal link end 71510B, a link distal link end 71520B, and a link body 71530B. The proximal link end 71510B is coupled to the proximal mounting member 71100 at a second proximal attachment location 71120B by a second proximal joint assembly 71130B. In the illustrated example, the second proximal joint assembly 71130B comprises a pair of second proximal attachment lugs 71132B that protrude from the proximal mounting member 71100. A second proximal attachment link 71134B is pivotally coupled to the second proximal attachment lugs 71132B by a first proximal joint pin 71136B that defines a third proximal joint axis TPJA3. The second proximal attachment link 71134B is pivotally attached to the proximal link end 71510B by a second proximal joint pin 71138B that defines a fourth proximal joint axis FPJA4 that is transverse to the third proximal joint axis TPJA3 as well as the shaft axis SA-SA.
In the illustrated example, the distal link end 71520B is coupled to the distal mounting member 71300 at a second distal attachment location 71320B by a second distal joint assembly 71330B. In the illustrated example, the second distal joint assembly 71330B comprises a pair of second distal attachment lugs 71332B that protrude from the distal mounting member 71300. A second distal attachment link 71334B is pivotally coupled to the second distal attachment lugs 71332B by a first distal joint pin 71336B that defines a third distal joint axis TDJA3. The second distal attachment link 71334B is pivotally attached to the distal link end 71520B by a second distal joint pin 71338B that defines a fourth distal joint axis FDJA4 that is transverse to the third distal joint axis TDJA3 as well as the shaft axis SA-SA.
In one non-limiting arrangement, articulation link member 715000 comprises a proximal link end 71510C, a link distal link end 71520C, and a link body 71530C. The proximal link end 71510C is coupled to the proximal mounting member 71100 at a third proximal attachment location 71120C by a third proximal joint assembly 71130C. In the illustrated example, the third proximal joint assembly 71130C comprises a pair of third proximal attachment lugs 71132C that protrude from the proximal mounting member 71100. A third proximal attachment link 71134C is pivotally coupled to the third proximal attachment lugs 71132C by a first proximal joint pin 71136C that defines a fifth proximal joint axis FPJA5. The third proximal attachment link 71134C is pivotally attached to the proximal link end 71510C by a second proximal joint pin 71138C that defines a sixth proximal joint axis SPJA6 that is transverse to the fifth proximal joint axis TPJA5 as well as the shaft axis SA-SA. In one non-limiting example, the first proximal attachment location 71120A, the second proximal attachment location 71120B, and the third proximal attachment location 71120C are equally spaced about the shaft axis SA-SA. Stated another way, the angles between the first proximal attachment location 71120A, the second proximal attachment location 71120B, and the third proximal attachment location 71120C are each approximately 120°.
In the illustrated example, the distal link end 71520C is coupled to the distal mounting member 71300 at a third distal attachment location 71320C by a third distal joint assembly 71330C. In the illustrated example, the third distal joint assembly 71330C comprises a pair of third distal attachment lugs 71332C that protrude from the distal mounting member 71300. A third distal attachment link 71334C is pivotally coupled to the third distal attachment lugs 71332C by a first distal joint pin 71336C that defines a fifth distal joint axis FDJA3. The third distal attachment link 71334C is pivotally attached to the distal link end 71520C by a second distal joint pin 71338C that defines a sixth distal joint axis SDJA6 that is transverse to the fifth distal joint axis FDJA5 as well as the shaft axis SA-SA. In one non-limiting example, the first distal attachment location 71320A, the second distal attachment location 71320B, and the third distal attachment location 71320C are equally spaced about the shaft axis SA-SA. Stated another way, the angles between the first distal attachment location 71320A, the second distal attachment location 71320B, and the third distal attachment location 71320C are each approximately 120°. In one arrangement, when the surgical end effector 200 is in an unarticulated position or, stated another way, axially aligned with the shaft assembly 100 on the shaft axis SA-SA, the first distal attachment location 71320A is diametrically opposite to the first proximal attachment location 71120A; the second distal attachment location 71320B is diametrically opposite to the second proximal attachment location 71120B; and the third distal attachment location 71320C is diametrically opposite to the third proximal attachment location 71120C.
In one aspect, the proximal shaft hole 71110 in the proximal mounting member 71100 and the distal shaft hole 71310 serve to define a central open passage area 72900.
In one arrangement, the entire central body portion 73030 is flexible and may be fabricated from a ductile material (e.g., polypropylene, low density polyethylene, liquid crystal polymer (LCP), Nylon, etc.) that is configured to facilitate twisting flexure when the end effector is articulated. In another arrangement, for example, the central body portion 73030 comprises a relative rigid hollow center segment that may comprise a polymer, metal, etc. and be coupled to a proximal flexible segment that is coupled to the proximal mounting collar 73012 and a distal flexible segment that is coupled to the distal mounting collar 73022. The proximal flexible segment and the distal flexible segment may be fabricated from polymer, rubber, etc. that is more flexible than the center segment. In the embodiment illustrated in
In the illustrated example, the shaft guide 73000 defines a central shaft guide axis SGA that extends from the shaft guide proximal end 73010 to the shaft guide distal end 73020. The shaft guide 73000 further comprises a first passage 73040 that opens through the proximal mounting collar 73012 on a first side RP1 of a reference plane RP that extends transversely through the shaft guide axis SGA. In the illustrated arrangement, the first passage 73040 is configured to operably support the portion of the flexible closure drive shaft 72000 that spans between the proximal mounting member 71100 and the distal mounting member 71300. As can be seen in
In the illustrated example, the shaft guide 73000 further comprises a second passage 73050 that opens through the proximal mounting collar 73012 on a second side RP2 of the reference plane RP. In the illustrated arrangement, the second passage 73050 is configured to operably support the portion of the flexible firing drive shaft 72100 that spans between the proximal mounting member 71100 and the distal mounting member 71300. As can be seen in
Referring now to
As can be seen in
Still referring to
As can be seen in
The illustrated surgical end effector 75000, for example, comprises a first jaw 201 and an anvil jaw 203, the various details of which were provided above. The surgical end effector further comprises a distal joint component 75450 that is similar to the joint component 450 discussed above. In at least one arrangement, the distal joint component 75450 is attached to the first jaw 201 by a retention ring 358 in the various manners described herein. In accordance with one aspect, a distal articulation cam 75500 is coupled to the distal joint component 75450. The distal articulation cam 75500 is configured to cammingly interface with a proximal articulation cam 75600 that operably interfaces with a shaft assembly 75410.
In accordance with at least one aspect, the shaft assembly 75410 is substantially similar to shaft assembly 410 described herein except for the noted differences. In one example, the shaft assembly comprises an outer shaft 75411 that operably interfaces with a proximal shaft joint component 75330. In accordance with one aspect, the proximal articulation cam 75600 is supported by the proximal shaft joint component 75330 for rotation about the shaft axis SA. In one embodiment, for example, the proximal articulation cam 75600 comprises a ring gear 75610 that is configured to meshingly interface with an articulation drive gear 75710 that is attached to an articulation drive shaft 75700 that is rotatably supported in the shaft assembly 75410. The articulation drive shaft 75700 operably interfaces with a source of rotary motion (e.g., a motor, etc.) that is supported in or by the housing or robotic system. Rotation of the articulation drive shaft 75700 in a first rotary direction will cause a proximal cam face 75620 on the proximal articulation cam 75600 to cammingly interface with a distal cam face 75520 on the distal articulation cam 75500 to articulate the surgical end effector 75000 through the articulation angle AAG. Continued rotation of the articulation drive shaft 75700 in the first direction will cause the surgical end effector to articulate through a single articulation plane until the surgical end effector 75000 reaches the maximum articulated position (articulation angle AAG equals approximately 65°) illustrated in
The embodiment depicted in
Other embodiments may employ the shaft embodiments comprising universally movable joints 60200 in the various manners and arrangements disclosed herein. The distal articulation cam 75500 and the proximal articulation cam 75500 define an articulation region 75100 and facilitate single plane, single direction, high-degree of articulation utilizing a rotating cam twist joint.
Various aspects of the subject matter described herein are set out in the following examples.
Example 1—A method of stapling comprising obtaining a surgical stapling assembly comprising a first jaw, a second jaw, an articulation joint, a closure drive comprising a first flexible rotary drive extending through the articulation joint, and a firing drive comprising a second flexible rotary drive extending through the articulation joint and rotatable independent of the first flexible rotary drive, wherein the surgical stapling assembly further comprises a 3D-printed component; activating, by a closure trigger, the closure drive, wherein the closure drive further comprises a closure screw and a closure wedge threadably coupled to the closure screw, wherein the closure wedge is configured to engage the first jaw to move the first jaw from an open position to a closed position upon a rotation of the first flexible rotary drive; and activating, by a firing trigger, the firing drive, wherein the firing drive further comprises a firing screw and a firing member threadably coupled to the firing screw, wherein the firing member is configured to camming engage the first jaw and the second jaw and to advance a cutting member and a staple-firing sled during a firing motion upon a rotation of the second flexible rotary drive.
Example 2—The method of stapling of Example 1, further comprising actuating, by an actuation wheel on a housing of the surgical stapling assembly, an articulation motion.
Example 3—The method of stapling of Example 2, wherein the first flexible rotary drive comprises an assembly of serial 3D-printed universal joints, and wherein the method of stapling further comprises flexing of the assembly of serial 3D-printed universal joints at the articulation joint during the articulation motion.
Example 4—The method of stapling of any one of Examples 1, 2 and 3, wherein the second flexible rotary drive comprises an assembly of serial 3D-printed universal joints, and wherein the method of stapling further comprises flexing of the assembly of serial 3D-printed universal joints at the articulation joint during the articulation motion.
Example 5—The method of stapling of any one of Examples 1, 2, 3, and 4, wherein the closure screw comprises a 3D-printed screw comprising a proximal bearing flange and a distal bearing flange, and wherein the method of stapling further comprises rotating the closure screw to advance the closure wedge and move the first jaw from an open position to a closed position.
Example 6—The method of stapling of any one of Example 5, wherein the closure wedge comprises a 3D-printed wedge trapped between the proximal bearing flange and the distal bearing flange, and wherein the method of stapling further comprises moving the 3D-printed wedge along the 3D-printed screw between the proximal bearing flange and the distal bearing flange.
Example 7—The method of stapling of any one of Examples 1, 2, 3, 4, 5, and 6, wherein the firing member comprises a 3D-printed firing member comprise a flexible region and a non-flexible region adjacent to the flexible region, and wherein the method of stapling further comprises expansion of the flexible region as the firing member camming engages the first jaw and the second jaw.
Example 8—The method of stapling of Example 7, wherein the flexible region comprises a first infill geometry, wherein the non-flexible region comprises a second infill geometry, wherein the second infill geometry is different than the first infill geometry, and wherein expansion of the flexible region further comprises an expansion of the cells defined in the first infill geometry more than an expansion of cells defined in the second infill geometry.
Example 9—The method of stapling of any one of Examples 1, 2, 3, 4, 5, 6, 7, and 8, wherein the firing screw extends through the second jaw to a distal mount, and wherein the method of stapling further comprises rotating the firing screw in the distal mount during the firing motion.
Example 10—The method of stapling of Example 9, wherein the method of stapling further comprises floating of the firing screw in the distal mount within a predefined range of motion during the firing motion.
Example 11—The method of stapling of Example 1, wherein the firing member comprises a threaded nut and an overmolded body portion, wherein the threaded nut comprises a driven surface threadably engaged with the firing screw and further comprises a driving surface abutting engaged with the overmolded body portion, wherein the method of stapling further comprises the threaded nut applying a driving force to the overmolded body portion eccentrically with respect to the firing screw during the firing motion.
Example 12—The method of stapling of any one of Examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11, further comprises installing a metal-plastic composite staple cartridge comprising staples in the second jaw.
Example 13—The method of stapling of Example 12, wherein the metal-plastic composite staple cartridge comprises a 3D-printed staple cartridge comprising a first side, a second side, a slot defined between the first side and the second side, and a bridge extending over the slot from the first side to the second side, wherein the bridge comprises 3D-printed frangible features, and wherein the method of stapling further comprises breaking the 3D-printed frangible features to cut the bridge during the firing motion.
Example 14—The method of stapling of any one of Examples 12 and 13, wherein the metal-plastic composite staple cartridge comprises a 3D-printed cartridge body comprising staple cavities and build layers oriented in a first direction, wherein the metal-plastic composite staple cartridge further comprises staple drivers movably positioned in the staple cavities, and wherein the method of stapling further comprises moving the staple drivers in the staple cavities along the build layers in the first direction during the firing motion.
Example 15—The method of stapling of any one of Examples 12, 13, and 14, wherein the metal-plastic composite staple cartridge comprises a metal knife, and wherein the method of stapling further comprises cutting tissue clamped between the first jaw and the second jaw.
Example 16—The method of stapling of Example 15, wherein the metal knife comprises a pair of opposing spring arms, and wherein the method of stapling further comprises releasably mounting the pair of opposing spring arms to the firing member upon installation of the metal-plastic composite staple cartridge in the second jaw.
Example 17—The method of stapling of any one of Examples 12, 13, 14, 15, and 16 wherein the metal-plastic composite staple cartridge comprises a metal sled, and wherein the method of stapling further comprises advancing the staple-firing sled through the metal-plastic composite staple cartridge to fire staples.
Example 18—The method of stapling of Example 17, wherein the metal sled comprises a multi-part sled, and wherein the method of stapling further comprises leaving a distal part of the multi-part sled in a distal location in the metal-plastic composite staple cartridge upon retraction of the firing member after the firing motion.
Example 19—The method of stapling of Example 12, wherein the metal-plastic composite staple cartridge comprises a disposable knife comprising a cutting edge, and wherein the method of stapling further comprises pivoting the cutting edge into a shielded position during a retraction motion of the firing member.
Many of the surgical instrument systems described herein are motivated by an electric motor; however, the surgical instrument systems described herein can be motivated in any suitable manner. In various instances, the surgical instrument systems described herein can be motivated by a manually-operated trigger, for example. In certain instances, the motors disclosed herein may comprise a portion or portions of a robotically controlled system. Moreover, any of the end effectors and/or tool assemblies disclosed herein can be utilized with a robotic surgical instrument system. U.S. patent application Ser. No. 13/118,241, entitled SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS, now U.S. Pat. No. 9,072,535, for example, discloses several examples of a robotic surgical instrument system in greater detail.
The surgical instrument systems described herein have been described in connection with the deployment and deformation of staples; however, the embodiments described herein are not so limited. Various embodiments are envisioned which deploy fasteners other than staples, such as clamps or tacks, for example. Moreover, various embodiments are envisioned which utilize any suitable means for sealing tissue. For instance, an end effector in accordance with various embodiments can comprise electrodes configured to heat and seal the tissue. Also, for instance, an end effector in accordance with certain embodiments can apply vibrational energy to seal the tissue.
The entire disclosures of:
Although various devices have been described herein in connection with certain embodiments, modifications and variations to those embodiments may be implemented. Particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, the particular features, structures, or characteristics illustrated or described in connection with one embodiment may be combined in whole or in part, with the features, structures or characteristics of one or more other embodiments without limitation. Also, where materials are disclosed for certain components, other materials may be used. Furthermore, according to various embodiments, a single component may be replaced by multiple components, and multiple components may be replaced by a single component, to perform a given function or functions. The foregoing description and following claims are intended to cover all such modification and variations.
The devices disclosed herein can be designed to be disposed of after a single use, or they can be designed to be used multiple times. In either case, however, a device can be reconditioned for reuse after at least one use. Reconditioning can include any combination of the steps including, but not limited to, the disassembly of the device, followed by cleaning or replacement of particular pieces of the device, and subsequent reassembly of the device. In particular, a reconditioning facility and/or surgical team can disassemble a device and, after cleaning and/or replacing particular parts of the device, the device can be reassembled for subsequent use. Those skilled in the art will appreciate that reconditioning of a device can utilize a variety of techniques for disassembly, cleaning/replacement, and reassembly. Use of such techniques, and the resulting reconditioned device, are all within the scope of the present application.
The devices disclosed herein may be processed before surgery. First, a new or used instrument may be obtained and, when necessary, cleaned. The instrument may then be sterilized. In one sterilization technique, the instrument is placed in a closed and sealed container, such as a plastic or TYVEK bag. The container and instrument may then be placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, and/or high-energy electrons. The radiation may kill bacteria on the instrument and in the container. The sterilized instrument may then be stored in the sterile container. The sealed container may keep the instrument sterile until it is opened in a medical facility. A device may also be sterilized using any other technique known in the art, including but not limited to beta radiation, gamma radiation, ethylene oxide, plasma peroxide, and/or steam.
While this invention has been described as having exemplary designs, the present invention may be further modified within the spirit and scope of the disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles.
Any patent, publication, or other disclosure material, in whole or in part, that is said to be incorporated by reference herein is incorporated herein only to the extent that the incorporated materials do not conflict with existing definitions, statements, or other disclosure material set forth in this disclosure. As such, and to the extent necessary, the disclosure as explicitly set forth herein supersedes any conflicting material incorporated herein by reference. Any material, or portion thereof, that is said to be incorporated by reference herein, but which conflicts with existing definitions, statements, or other disclosure material set forth herein will only be incorporated to the extent that no conflict arises between that incorporated material and the existing disclosure material.
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| Number | Date | Country | |
|---|---|---|---|
| 20220304679 A1 | Sep 2022 | US |
