This invention is related to medical devices. Specifically, but not intended to limit the invention, embodiments of the invention are related to an electrosurgical instrument for cutting and sealing tissue.
A number of electrosurgical devices for cutting and sealing tissue are known in the field.
For example, the currently-available devices include the LigaSure (Ligasure is a trademark brand of Medtronic) line of devices, which includes a combined sealer and divider. This tool provides a pair of jaws that have substantially flat interfaces. That is, as illustrated in
The LigaSure tool and other known devices also have electrode surfaces with a large tissue sealing surface.
There remains a need for a device that provides the ability to reliably cut and seal tissue without damaging non-targeted tissue, and/or other new and innovative features.
An exemplary electrosurgical instrument is provided. The exemplary device has a movable tissue cutting mechanism. The exemplary device also has a pair of opposing jaws having a first jaw and a second jaw, the pair of opposing jaws shaped and configured to move between a closed position for clamping and sealing tissue therebetween and an open position. At least one jaw has a conductive core member and a non-conductive coating. The non-conductive coating covers a portion of the core member and exposes a portion of the core member to form a sealing surface area recessed relative to the non-conductive coating. Each jaw has an elongated slot for receiving a portion of the cutting mechanism, the cutting mechanism configured to move between a proximal position and a distal position for cutting tissue clamped between the pair of opposing jaws.
An exemplary method of making an electrosurgical instrument is also provided. The exemplary method includes providing a movable tissue cutting mechanism. The exemplary method includes providing a pair of jaws, at least one jaw of the pair of jaws having a conductive core member, each jaw having an elongated slot for receiving a portion of the movable tissue cutting mechanism, the cutting mechanism configured to move between a proximal position and a distal position for cutting tissue clamped between the pair of opposing jaws. The exemplary method includes coating the at least one jaw with a non-conductive coating, such that the non-conductive coating exposes a portion of the core member to form a sealing surface area recessed relative to the non-conductive coating. The exemplary method includes coupling the pair of jaws such that they oppose one another and are movable between a closed position for clamping tissue therebetween and an open position.
Various objects and advantages and a more complete understanding of the present invention are apparent and more readily appreciated by reference to the following Detailed Description and to the appended claims when taken in conjunction with the accompanying Drawings, where like or similar elements are designated with identical reference numerals throughout the several views and wherein:
Table 1 is a table of results of testing using an exemplary device.
As previously alluded in the background of this document, and as illustrated in
To meet the need for a device that is eligible for these regulatory safety ratings, the Applicants generally determined that a low power device having certain parameters can be utilized to reliably and safely seal tissue. These teachings are published in co-owned U.S. Pat. No. 9,265,561 (the '561 patent), to Kennedy et al., and discloses a system and method for sealing tissue at low powers. The entire contents of the '561 patent are incorporated herein by reference in their entirety as if fully set forth herein.
In a related patent, co-owned U.S. Pat. No. 9,039,694 (the '694 patent), to Ross et al., discloses a system and method for providing power to an electrosurgical instrument. The entire contents of the '694 patent are incorporated herein by reference in their entirety as if fully set forth herein.
The teachings of the following U.S. Patents are incorporated by reference herein for all proper purposes: U.S. Pat. No. 5,876,401 to Schulze, U.S. Pat. No. 6,174,309 to Wrublewski, U.S. Pat. No. 6,458,128 to Schulze, U.S. Pat. No. 6,682,528 to Frazier, U.S. Pat. No. 7,083,618 to Couture, U.S. Pat. No. 7,101,373 to Dycus, U.S. Pat. No. 7,156,846 to Dycus, U.S. Pat. No. 7,101,371 to Dycus, U.S. Pat. No. 7,255,697 to Dycus, U.S. Pat. No. 7,722,607 to Dumbauld, U.S. Pat. No. 8,540,711 to Dycus, U.S. Pat. No. 7,131,971 to Dycus, U.S. Pat. No. 7,204,835 to Latterell, U.S. Pat. No. 7,211,080 to Treat, U.S. Pat. No. 7,473,253 to Dycus, U.S. Pat. No. 7,491,202 to Odom, U.S. Pat. No. 7,857,812 to Dycus, U.S. Pat. No. 8,241,284 to Dycus, U.S. Pat. No. 8,246,618 to Bucciaglia, U.S. Pat. No. 8,361,072 to Dumbauld, U.S. Pat. No. 8,469,956 to McKenna, U.S. Pat. No. 8,523,898 to Bucciaglia, U.S. Pat. No. 8,579,894 to Falkenstein, U.S. Pat. No. 8,968,311 to Allen, U.S. Pat. No. 9,011,437 to Woodruff, U.S. Pat. No. 9,028,495 to Mueller, U.S. Pat. No. 9,113,901 to Allen, U.S. Pat. No. 5,800,44 to Wales, U.S. Pat. No. 5,462,546 to Rydell, U.S. Pat. No. 5,445,638 to Rydell, U.S. Pat. No. 5,697,949 to Giurtino, U.S. Pat. No. 5,797,938 to Parashac, U.S. Pat. No. 6,334,860 to Dorn, U.S. Pat. No. 6,458,130 to Frazier, U.S. Pat. No. 6,113,598 to Baker, and U.S. Pat. No. 6,033,399 to Gines.
The teachings of the following U.S. Patent Publications are incorporated by reference herein for all proper purposes: US2014/0031819A1 to Dycus, US2015/0250531A1 to Dycus, US2015/0133930 to Allen, US2013/0131651 to Strobl, US2014/0257285 to Moua, US2007/0173813 to Odom, US2009/0076506 to Baker, US2005/0010212 to McClurken, US2007/0173804 to Wham, and US2007/0156140 to Baily.
The teaching of the following European publication is incorporated by reference herein for all proper purposes: EP0986990A1 to Eggers.
Applicants have developed a device that can safely seal and cut tissue, that not only functions reliably at low powers, but also result in a significantly smaller footprint of affected tissue. That is, Applicants' device is not prone to cause stray burns to tissue near a surgical site, thereby providing a tool that is eligible for certain regulatory safety ratings.
Turning now to
The jaws 102, 104 may be curved to a right or a left of an X-Y plane defined by a longitudinal axis X and a vertical axis Y, in a manner that may be conducive to grasping, dissecting, manipulating and/or retracting tissue. That is, a longitudinal axis X may be defined by a straight line, while a sealing axis W may be curved two- or three-dimensionally. In the embodiment illustrated in
In some embodiments, the jaws 102, 104 are configured to selectively apply a surgical power for sealing tissue at power levels in a manner similar to that illustrated or described in the '561 patent). The jaws 102, 104 may also comprise material or other design selections as disclosed in the '561 patent and/or the '694 patent. In the embodiment illustrated, overmolding 160 is illustrated transparently, and those skilled in the art will understand that the overmolding 160 may be provided about a number of features, for aesthetic purposes and/or for electrical isolation.
In some embodiments, and as illustrated in
In some embodiments, the device is configured to maintain a gap G between the primary sealing surfaces 142, 143 of between about 0.2 millimeters and about 0.05 millimeters. In some embodiments, the gap G is between about 0.16 and about 0.20 millimeters at the proximal portion. In some embodiments, the gap G is between about 0.05 millimeters and about 0.07 millimeters at the distal portion. In some embodiments, the gap G is at least 0.07 millimeters. In some embodiments, the gap G continuously decreases from the proximal portion to the distal portion.
In some embodiments, the device is configured to maintain a gap G between the primary sealing surfaces 142, 143 of between about 0.25 millimeters and about 0.03 millimeters. In some embodiments, the gap G is between about 0.16 and about 0.25 millimeters at the proximal portion. In some embodiments, the gap G is between about 0.03 millimeters and about 0.07 millimeters at the distal portion.
Turning now to
As illustrated in
As illustrated in
Returning to
As illustrated in
In some embodiments, a height H of a first protrusion is greater than a height H of a second protrusion. In some embodiments, a height H of a protrusion at a proximal region of the jaw 102, 104 is greater than a height H of a protrusion closer to the distal region of the jaw 102, 104. In some embodiments, a protrusion 132 closer to the proximal region of the jaw 102, 104 may have a circular portion with a radius of curvature that is less than a circular portion of a protrusion 132 closer to the distal region of the jaw 102, 104. In some embodiments, a protrusion 132 closer to the proximal region may be configured to induce a sharper current concentration than does a protrusion 132 closer to the distal region.
As further illustrated in
In some embodiments, a single protrusion 132 is provided on one of the jaws 102, 104. In some embodiments, two protrusions 132 are provided on the jaws 102, 104.
Returning again to
The conductive recesses 134 may have a depth corresponding to the height H of the protrusion(s) 132, again to ensure that an energy concentration is induced without introducing potential weakened or thinned spots in tissue that is sealed using the device 100.
In some embodiments, the depth is between about 0.015 millimeters and about 0.080 millimeters. In some embodiments, the depth is between about 0.03 millimeters and about 0.06 millimeters. In some embodiments, a depth of a first recess 134 is greater than a depth of a second recess 134. In some embodiments, a depth of a recess at a proximal region of the jaw 102, 104 is greater than a depth of a recess closer to the distal region of the jaw 102, 104. In some embodiments, a recess 134 closer to the proximal region of the jaw 102, 104 may have a circular portion with a radius of curvature that is less than a circular portion of a recess 134 closer to the distal region of the jaw 102, 104. In some embodiments, a recess 134 closer to the proximal region may be configured to induce a sharper current concentration than does a recess 134 closer to the distal region.
One or more conductive protrusions 132, and, optionally, conductive recesses 134 may be provided so as to induce an energy concentration at the protrusion 132 and recess 134, and may be referred to as energy or current concentrators. That is, the conductive protrusions 132 do not necessarily have corresponding recesses 134. By inducing this energy concentration, Applicants have provided an improved method of sealing tissue—specifically, the current concentration at each protrusion/recess 132, 134 interface is configured to induce an initial flow of energy between the jaws 102, 104 before allowing the energy to flow across the entire respective surfaces 120, 122. In turn, the overall power requirements for the system 100 are lowered, yet still provides the ability to seal relatively large tissue sections at a low power, such as at 40 Watts or less, or at other power levels and current concentrations as described in the '561 patent. In some embodiments, the device 100 is configured to deliver a power of 50 Watts or less. In some embodiments, the device 100 is configured to deliver a power of 40 Watts or less. In some embodiments, the device 100 is configured to deliver a power of 35 Watts or less. In some embodiments, the device 100 is configured to deliver a power of 20 Watts or less. In some embodiments, the device 100 is configured to deliver a current of 3 Amperes or less. In some embodiments, the device 100 is configured to deliver a current of 2.5 Amperes or less. The current or energy concentrators may be shaped so as to concentrate current without inducing sparking.
In some embodiments, the instrument 100 is shaped to pass through a cannula having an inner diameter of 6 millimeters or less.
Moreover, the protrusions/recesses 132, 134 and/or the curved sealing surfaces 120, 122 reduce or eliminate the chances of tissue sticking to the jaws 102, 104 after a seal is complete, without the use of exotic materials in the jaws 102, 104. That is, the jaws 102, 104 including the protrusions 132 and recesses 134 may be made of a surgical stainless steel without any non-stick coating applied thereto. For example, the protrusions 132 and/or the recesses 134 may be shaped and/or positioned so as to initiate a concentrated pulling-away effect on relatively targeted regions of tissue as the jaws 102, 104 are opened, thereby improving separation. In some cases, the protrusions 132 and/or the recesses 134 may be shaped and/or positioned so as to apply a separating force on targeted regions of tissue that is greater than a separating force on non-targeted regions of tissue (e.g. tissue that is further from the protrusions 132 and/or the recesses 134, such as tissue between the primary sealing surfaces 142, 143). In some embodiments, a gap between one or more of the conductive protrusions 132 and one or more recesses 134 is less than the gap G between the primary sealing surfaces 142, 143 of the jaws 102, 104.
In some embodiments, the jaw(s) 102, 104 may have a sealing surface 120, 122 with a sealing surface area of 24 square millimeters or less. In some embodiments, the jaw(s) 102, 104 may have a sealing surface 120, 122 with a sealing surface area of 10 square millimeters or less.
Continuing with
In some embodiments, the cutting path 118 defines a length of stroke S (of the cutting mechanism 106), as illustrated in, for example,
In some embodiments, the channels 114, 116 and/or cutting path 118 generally may include one or more stop features (not illustrated), so as to allow a user to adjust the length of stroke S relative to the jaws 102, 104. In some embodiments, the channels 114, 116 and/or cutting path 118 generally may include one or more tactile feedback features (not illustrated) that provide tactile feedback to the user. The tactile feedback features may provide the user with the ability to stroke the cutting mechanism 106 less than the entire length of stroke S or less than the entire length of sealed tissue in a first stroke, optionally open the jaws 102, 104 to optionally confirm that the tissue has been properly sealed, and then, optionally after re-closing the jaws 102, 104 to stroke the cutting mechanism 106 in a second stroke a distance that is greater than the first stroke. In some embodiments, the tactile feedback mechanism provides the user the apply sense or feel the length of stroke of more than two strokes having more than two lengths. The tactile feedback mechanism may include one or more ridges, dimples, detents, and/or any other tactile feedback means now known or as-yet to be developed, and suitable for indicating a general position of the cutting mechanism 106 relative to the jaws 102, 104.
Continuing with
As most clearly illustrated in
As previously alluded in this document, in some embodiments, a relatively small sealing/cutting device 100 may be provided. For example, in some embodiments, the device 100 may have an overall envelope of less than 3.0 millimeters and/or be configured to fit within a cannula of 3.5 millimeters. In some embodiments, the device 100 may have an envelope of less than 5.0 millimeters and/or may be configured to fit within a cannula of 5.5 millimeters. In some embodiments, the device 100 may be configured to fit within a cannula of 7.5 millimeters. In some embodiments, the device 100 may be configured to fit within a cannula of 10.5 millimeters.
Those skilled in the art will recognize that a smaller device 100 such as that described herein must still provide the same clamping force on tissue as a larger device does, resulting in significant force concentrations at, for example, the interface between the jaws 102, 104 and the links 162, 164 controlling the jaws 102, 104. Therefore, in some embodiments, the jaws 102, 104 include a plurality of bushings 144, 146, 148, 150 (see
In some embodiments, a pin 168 passes through a pair of distal bushings 146, 150 in the jaws 102, 104, an elongated slot in the cutting mechanism 106, and the split shaft 166 to rotatably mount the jaws 102, 104 to the shaft 166. In some embodiments, protrusions in a pair of links 162, 164 engage a pair of proximal bushings 144, 148 in the jaws 102, 104 serve to translate opening/closing actions by a split rod 156 into rotating actions of the jaws 102, 104.
Turning now to
Turning now to
The method 1500 may be achieved using a device as previously described with reference to
With reference now to
With reference now to
In some embodiments, a travel stop 174 may be provided at or near a proximal region of one or both jaws 102, 104, so as to limit over-compression in a manner similar to that of the travel stop 112 previously described herein. In some embodiments, a travel stop 174 at the proximal region of a jaw may be formed from the coating 182. The travel stop 174 may be a flange in a proximal region of a jaw 102, 104. Those skilled in the art will recognize that, although
As illustrated in
As described in reference to the previous figures, the device illustrated in
Turning now to
Although illustrated as a flat surface, those skilled in the art should recognize that the sealing surfaces 120, 122 in the instrument illustrated in
Turning now to
In some embodiments, coating 2706 comprises at least one of overmolding, plasma spraying, detonation spraying, wire arc spraying, thermal spraying, flame spraying, high velocity oxy-fuel spraying, high velocity air fuel spraying, warm spraying, or cold spraying.
The following list is a non-exhaustive list of exemplary embodiments. From the list, one skilled in the art can readily recognize that many features of the device 100 illustrated in the Figures can be added or removed, and features illustrated in a first figure may be suitable for use in a device illustrated in a second figure, even if not illustrated as such.
With reference now to Table 1, an electrosurgical instrument according to embodiments described herein was tested on 5 seals. The jaws of the instrument had a sealing surface of about 57 square millimeters, and a coating on a portion of the jaws provided for a recessed sealing surface relative to the coating. The sealing surface was recessed by at least 0.101 millimeters on each jaw, and stops provided for a gap of about 0.127 millimeters between the jaws during sealing. The device was set to nominal output settings of 50 Watts maximum power, 100 Volts maximum voltage, and 2.5 Amperes maximum current. The device was also set to cease the application of power when impedance to energy passing through the tissue reached 250 Ohms.
The device was used to apply the 5 seals listed in Table 1.
Each of the seals were cut and examined after sealing, and were determined to be of excellent quality. Specifically, the seals were found to be transparent, with a clean edge (transfer from sealed to unsealed tissue), indicating a strong seal. No damage, such as charring, was observed adjacent the seal, indicating little thermal spread.
For comparison, another device having a jaw sealing surface area of about 113 square millimeters, and the same power settings listed above (50 Watts, 100 Volts, 2.5 Amperes, and 250 Ohms stop) was tested. With all other factors being equal, the 113 square millimeter jaw was not operable to seal larger full jaw vessels. The inoperability of the 113 square millimeter jaw at the same power settings demonstrates that a smaller sealing surface area provides greater functionality at low power settings.
More specifically, a device providing a current concentration of about 0.0345 Amperes per square millimeter (or 2.00 Amperes per 58 square millimeters or less) has been proven to provide reliable sealing. In some embodiments, the device is configured to provide a current concentration of about 0.025 Amperes per square millimeter or more. In some embodiments, the device is configured to provide a current concentration of about 0.030 Amperes per square millimeter or more. In some embodiments, the device is configured to provide a current concentration of about 0.030 Amperes or more per square millimeter and a power of 50 Watts or less. Those skilled in the art will recognize that a pair of jaws 102, 104 that are not completely filled with tissue will have a higher concentration. In some embodiments, the current concentrators 132, 134 described herein may provide an effective high concentration of current to initiate a sealing action. That is, even if other areas of tissue clamped between the jaws 102, 104 do not experience a current concentration of at least 0.025 Amperes per square millimeter, the current concentrators 132, 134 may be configured to effectuate this concentration at the area near the current concentrators 132, 134, and not necessarily across all tissue clamped between the jaws 102, 104.
The following is a non-exhaustive list of embodiments described herein.
An electrosurgical instrument comprising: a movable tissue cutting mechanism; and a pair of opposing jaws having a first jaw and a second jaw, the pair of opposing jaws shaped and configured to move between a closed position for clamping and sealing tissue therebetween and an open position; wherein at least one jaw comprises a conductive core member and a non-conductive coating, the non-conductive coating covering a portion of the core member and exposing a portion of the core member to form a sealing surface area recessed relative to the non-conductive coating; and each jaw comprises an elongated slot for receiving a portion of the cutting mechanism, the cutting mechanism configured to move between a proximal position and a distal position for cutting tissue clamped between the pair of opposing jaws.
The instrument of embodiment 1, wherein: the non-conductive coating is formed on the core member of the at least one jaw by at least one of an overmold, a plasma spray coating, a detonation spray coating, a wire arc spray coating, a thermal spray coating, a flame spray coating, a high velocity oxy-fuel spray coating, a high velocity air fuel coating, a warm spray coating, or a cold spray coating.
The instrument of embodiment 1 or 2, wherein: the sealing surface area of the at least one jaw extends a distance of no more than 0.8 millimeters from the elongated slot.
The instrument of any one of embodiment 1-3, wherein: the sealing surface area extends a distance of between 0.2 millimeters and 0.7 millimeters from the elongated slot.
The instrument of any one of embodiments 1-4, wherein: the sealing surface area of the at least one jaw extends no more than 0.6 millimeters from the elongated slot.
The instrument of any one of embodiments 1-5, wherein: the coating is configured to maintain a gap between the surface areas of the pair of jaws in the closed position; and the gap is 0.05 millimeters or more.
The instrument of embodiment 6, wherein: the gap is 0.18 millimeters or less.
The instrument of embodiment 7, wherein: the gap is at least 0.07 millimeters.
The instrument of any one of embodiments 1-8, wherein: the non-conductive coating is formed on the core member by at least one of an overmold, a plasma spray coating, a detonation spray coating, a wire arc spray coating, a thermal spray coating, a flame spray coating, a high velocity oxy-fuel spray coating, a high velocity air fuel coating, a warm spray coating, or a cold spray coating.
The instrument of embodiment 9, wherein: the device is further configured to deliver a maximum power of 50 Watts and a maximum current of 3 Amperes to tissue clamped between the jaws.
The instrument of any one of embodiments 1-10, wherein: the pair of jaws are further shaped to fit through a cannula having an inner diameter of 6 millimeters or less when the jaws are in the closed position.
The instrument of any one of embodiments 1-11, further comprising: a linkage mechanism for controlling relative rotation of the pair of jaws, the linkage mechanism having a first pair of non-conductive bushings in the first jaw, a second pair of non-conductive bushings in the second jaw, a pin extending through a first one of the bushings in each of the jaws to enable rotation relative to a split rod, and a link coupled to a second one of the bushings in each of the jaws.
The instrument of embodiment 12, wherein: the non-conductive bushings isolate the links and the pin from the core members.
The instrument of any one of embodiments 1-13, wherein: the sealing surface area of the at least one jaw is less than 24 square millimeters; and the sealing surface area extends no more than 0.8 millimeters from the elongated slot.
The instrument of any one of embodiments 1-14, wherein: at least one of (a) the sealing surface area of the at least one jaw is less than 10 square millimeters or (b) the sealing surface area extends no more than 0.6 millimeters from the elongated slot.
The instrument of any one of embodiments 1-15, wherein: the instrument is further configured to apply no more than 50 Watts of power to tissue clamped between the opposing jaws; and the instrument is further configured to apply no more than 3 Amperes of current to tissue clamped between the opposing jaws.
The instrument of any one of embodiments 1-16, wherein: the least one jaw has a proximal end having a pair of non-conductive bushings, and a distal end; the coating is configured to maintain a gap between the sealing surfaces of the pair of jaws; and a proximal portion of the gap is greater than a distal portion of the gap.
The instrument of embodiment 17, wherein: the coating extends from the proximal region to the distal region.
The instrument of any one of embodiments 1-18, wherein: the recessed sealing surface of the at least one jaw comprises a primary sealing surface; and the primary sealing surface is a curved surface.
The instrument of embodiment 19; wherein: the recessed sealing surface further comprises at least one of a protrusion or a recess for concentrating a current flow from the at least one jaw through tissue clamped between the pair of jaws.
The instrument of any one of the preceding embodiments, wherein: the recessed sealing surface of the at least one jaw comprises a primary sealing surface; and the primary sealing surface is a flat surface.
The instrument of embodiment 21 wherein: the recessed sealing surface of the at least one jaw further comprises at least one of a protrusion or a recess for concentrating a current flow from the at least one jaw through tissue clamped between the pair of jaws
The instrument of any one of the preceding embodiments, wherein: the recessed sealing surface of the at least one jaw comprises a primary sealing surface and at least one of a protrusion or a recess for concentrating a current flow from the at least one jaw through tissue clamped between the pair of jaws.
The instrument of any one of the preceding embodiments, wherein: the recessed sealing surface of the at least one jaw comprises a protrusion; the other one of the pair of opposing jaws comprises a recess opposing the protrusion; and wherein the protrusion and the recess are configured to concentrate a current flow through the protrusion and the recess.
The instrument of any one of embodiments 1-24, wherein: at least a portion of the elongated slot is non-linear.
A method of making an electrosurgical instrument, comprising: providing a movable tissue cutting mechanism; providing a pair of jaws, at least one jaw of the pair of jaws having a conductive core member, each jaw having an elongated slot for receiving a portion of the movable tissue cutting mechanism, the cutting mechanism configured to move between a proximal position and a distal position for cutting tissue clamped between the pair of opposing jaws; coating the at least one jaw with a non-conductive coating, such that the non-conductive coating exposes a portion of the core member to form a sealing surface area recessed relative to the non-conductive coating; coupling the pair of jaws such that they oppose one another and are movable between a closed position for clamping tissue therebetween and an open position.
The method of embodiment 26, wherein: coating comprises at least one of overmolding, plasma spraying, detonation spraying, wire arc spraying, thermal spraying, flame spraying, high velocity oxy-fuel spraying, high velocity air fuel spraying, warm spraying, or cold spraying.
An electrosurgical instrument comprising: a movable tissue cutting mechanism; and a pair of opposing jaws having a first jaw and a second jaw, the pair of opposing jaws shaped and configured to move between a closed position for clamping and sealing tissue clamped therebetween and an open position; wherein the first jaw comprises an exposed tissue sealing surface, the exposed tissue sealing surface having a primary sealing surface and least one protrusion extending from the primary sealing surface for concentrating a sealing current through the at least one protrusion; the second jaw comprises an exposed tissue sealing surface, the exposed tissue sealing surface having a primary sealing surface and at least one recess in the primary sealing surface for concentrating a sealing current through the at least one recess; wherein the at least one protrusion and the at least one recess oppose one another when the pair of opposing jaws are in the closed position; and each one of the pair of opposing jaws comprises an elongated slot for receiving a portion of the cutting mechanism, the cutting mechanism configured to move between a proximal position and a distal position for cutting tissue clamped between the pair of opposing jaws.
The instrument of embodiment 28, wherein: at least one of the first jaw or the second jaw has a conductive core member and a non-conductive coating, the non-conductive coating covering a portion of the conductive core member and exposing the tissue sealing surface such that the tissue sealing surface is recessed relative to the non-conductive coating; and the non-conductive coating is formed on the core member of the at least one jaw by at least one of an overmold, a plasma spray coating, a detonation spray coating, a wire arc spray coating, a thermal spray coating, a flame spray coating, a high velocity oxy-fuel spray coating, a high velocity air fuel coating, a warm spray coating, or a cold spray coating.
The instrument of embodiment 28 or 29, wherein: at least one of the first jaw or the second jaw comprises at least one of a non-conductive distal travel stop, the distal travel stop positioned distal of the elongated slot and configured to maintain a gap between the primary sealing surfaces of the first and second jaws in the closed position; or a non-conductive proximal travel stop, the proximal travel stop positioned proximal of the exposed tissue sealing surface and configured to maintain a gap between the primary seal surfaces of the first and second jaws in the closed position; and wherein the gap is between 0.05 millimeters and 0.18 millimeters.
The instrument of any one of embodiments 28-30, wherein: the instrument is configured to maintain a gap between the at least one protrusion and the at least one recess when the jaws are in the closed position, wherein the gap is between 0.05 millimeters and 0.18 millimeters.
The instrument of any one of embodiments 28-31, wherein: the device is further configured to deliver a maximum power of 50 Watts to tissue clamped between the jaws.
The instrument of any one of embodiment 28-32, wherein: the instrument is further shaped to fit through a cannula having an inner diameter of 6 millimeters or less when the jaws are in the closed position.
The instrument of any one of embodiments 28-33, further comprising: a linkage mechanism for controlling relative rotation of the pair of jaws, the linkage mechanism having a first pair of non-conductive bushings in the first jaw, a second pair of non-conductive bushings in the second jaw, a pin extending through a first one of the bushings in each of the jaws to enable rotation relative to a split rod, and a link coupled to a second one of the bushings in each of the jaws.
The instrument of embodiment 34, wherein: the non-conductive bushings isolate the links and the pin from core members of the pair of jaws.
The instrument of any one of embodiments 28-35, wherein: the exposed tissue sealing surface at least one of the first or second jaws has a surface area of 24 square millimeters or less.
The instrument of embodiment 36, wherein: the exposed tissue sealing surface of the at least one of the first or second jaws has a surface area of 10 square millimeters or less.
The instrument of any one of embodiments 28-37, wherein: the instrument is further configured to apply no more than 50 Watts of power and no more than 3 Amperes to tissue clamped between the pair of opposing jaws.
The instrument of any one of embodiments 28-38, wherein: at least one of the first or second jaw has a conductive core member with a proximal end and a distal end; the proximal end of the core member has a pair of recesses; and a pair of non-conductive bushings are positioned in the pair of recesses.
The instrument of any one of embodiments 28-39, wherein: the primary sealing surfaces of the first and second jaws are curved.
The instrument of embodiment 40, wherein: a first one of the primary sealing surfaces is concave; and a second one of the primary sealing surfaces is convex.
The instrument of embodiment 41, wherein: a first one of the primary sealing surfaces is concave; and a second one of the primary sealing surfaces is convex; whereby the primary sealing surfaces are shaped to promote disengagement of tissue sealed therebetween upon moving from the closed position to the open position.
The instrument of any one of embodiments 28-42, wherein: at least a portion of the elongated slot is non-linear.
A method of making an electrosurgical instrument, comprising: providing a movable tissue cutting mechanism; providing a pair of jaws having a first jaw and a second jaw, each of the jaws having an elongated slot for receiving the movable tissue cutting mechanism, the first jaw having an exposed tissue sealing surface, the exposed tissue sealing surface having a primary sealing surface and least one protrusion extending from the primary sealing surface for concentrating a sealing current through the at least one protrusion, the second jaw having an exposed tissue sealing surface, the exposed tissue sealing surface having a primary sealing surface and at least one recess in the primary sealing surface for concentrating a sealing current through the at least one recess; shaping the pair of jaws such that the at least one protrusion and the at least one recess oppose one another when the pair of opposing jaws are in the closed position; coupling the pair of jaws such that they oppose one another and are movable between a closed position for clamping tissue therebetween and an open position.
The method of embodiment 44, further comprising: shaping one of the primary sealing surfaces with a concave curvature; and shaping the other one of the primary sealing surfaces with a convex curvature.
Any one of the preceding embodiments, wherein the instrument is a vessel sealing and cutting instrument.
Any one of the preceding embodiments, wherein each jaw has a jaw sealing surface, the jaw sealing surface having a surface area of between 23 square millimeters and 58 square millimeters, and the device is configured to apply no more than 50 Watts of power with no more than 3 Amperes and no more than 100 volts to tissue clamped between the jaws, the tissue being a vessel that is greater than 5 millimeters wide and up to 15 millimeters wide, and wherein the device is configured to seal the tissue clamped between the jaws within 5 seconds or less.
The device of embodiment 47, wherein the device is configured to seal the tissue clamped between the jaws within 4 seconds or less.
The device of embodiments 47 or 48, wherein the device is configured to deliver no more than 3 Amperes to the tissue clamped between the jaws.
The device or method of any one of the preceding embodiments, wherein the device is configured to apply a current concentration of at least 0.025 Amperes per square millimeter across at least a portion of tissue clamped between the jaws.
Each of the various elements disclosed herein may be achieved in a variety of manners. This disclosure should be understood to encompass each such variation, be it a variation of an embodiment of any apparatus embodiment, a method or process embodiment, or even merely a variation of any element of these. Particularly, it should be understood that the words for each element may be expressed by equivalent apparatus terms or method terms—even if only the function or result is the same. Such equivalent, broader, or even more generic terms should be considered to be encompassed in the description of each element or action. Such terms can be substituted where desired to make explicit the implicitly broad coverage to which this invention is entitled.
As but one example, it should be understood that all action may be expressed as a means for taking that action or as an element which causes that action. Similarly, each physical element disclosed should be understood to encompass a disclosure of the action which that physical element facilitates. Regarding this last aspect, the disclosure of a “fastener” should be understood to encompass disclosure of the act of “fastening”—whether explicitly discussed or not—and, conversely, were there only disclosure of the act of “fastening”, such a disclosure should be understood to encompass disclosure of a “fastening mechanism”. Such changes and alternative terms are to be understood to be explicitly included in the description.
Moreover, the claims shall be construed such that a claim that recites “at least one of A, B, or C” shall read on a device that requires “A” only. The claim shall also read on a device that requires “B” only. The claim shall also read on a device that requires “C” only. Similarly, the claim shall also read on a device that requires “A+B”, and so forth. The claim shall also read on a device that requires “A+B+C”.
The claims shall also be construed such that any relational language (e.g. perpendicular, straight, parallel, flat, etc.) is understood to include the recitation “within a reasonable manufacturing tolerance at the time the device is manufactured or at the time of the invention, whichever manufacturing tolerance is greater”.
In conclusion, the present invention provides, among other things, a system and method for an electrosurgical procedure. Those skilled in the art can readily recognize that numerous variations and substitutions may be made in the invention, its use and its configuration to achieve substantially the same results as achieved by the embodiments described herein. Accordingly, there is no intention to limit the invention to the disclosed exemplary forms. Many variations, modifications and alternative constructions fall within the scope and spirit of the disclosed invention as expressed in the claims.
This application claims priority to U.S. Provisional Application No. 62/323,030 filed on Apr. 15, 2016 and entitled “ELECTROSURGICAL SEALER AND DIVIDER,” the entire disclosure of which is hereby incorporated by reference for all proper purposes.
Number | Date | Country | |
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62323030 | Apr 2016 | US |