Patent Grant
11278337
This disclosure relates generally to devices and methods for positioning and/or preparing bones.
Bones, such as the bones of a foot, may be anatomically misaligned. In certain circumstances, surgical intervention is required to correctly align the bones to reduce patient discomfort and improve patient quality of life.
Embodiments of the present invention include methods for fixing an orientation of a bone or bones. In general, the method of positioning a bone includes the steps of moving a bone from an anatomically misaligned position to an anatomically aligned position with respect to another bone and preparing an end of the bone and a facing end of another bone. In some embodiments, at least one bone end is prepared after the bone is moved into the aligned position. In some embodiments, the bone is anatomically aligned in more than one plane such that the bone both translates and rotates in response to a moving force.
One embodiment includes a method of correcting a bunion deformity. The method includes inserting a fulcrum between a first metatarsal and a second metatarsal, where the first metatarsal is anatomically misaligned with respect to the second metatarsal. The method further includes preparing an end of the first metatarsal and preparing an end of a medial cuneiform opposing the end of the first metatarsal. In addition, the method involves moving a distal portion of the first metatarsal toward the second metatarsal in a transverse plane, thereby pivoting a proximal portion of the first metatarsal about the fulcrum and reducing the intermetatarsal angle between the first metatarsal and the second metatarsal.
In one example, a fulcrum is described for use in a bone realignment procedure. The fulcrum includes a body and a handle. The body is configured to be inserted in an intermetatarsal space between adjacent metatarsals. The handle is operatively connected to the body. The example specifies that the handle projects at a non-zero degree angle from the body to define a tissue retraction space between the handle and the body.
In another example, a multidimensional fulcrum is described that includes a fulcrum body having a length extending from a first end to a second end, a width, and a thickness. The first end of the fulcrum has a first thickness and is configured to be inserted into an intermetatarsal space between adjacent metatarsals of a first size. The second end of the fulcrum has a second thickness and is configured to be inserted into an intermetatarsal space between adjacent metatarsals of a second size. The example specifies that the second thickness is greater than the first thickness.
The details of one or more examples are set forth in the accompanying drawings and the description below. Other features, objects, and advantages will be apparent from the description and drawings, and from the claims.
The following drawings are illustrative of particular embodiments of the present invention and, therefore, in no way limit the scope of the invention. The drawings are not necessarily to scale (unless otherwise stated) and are intended for use in conjunction with the explanations in the following detailed description. Embodiments of the invention will hereinafter be described with respect to the appended drawings, wherein like numerals denote like elements.
The following detailed description is exemplary in nature and is not intended to limit the scope, applicability, or configuration of the invention. Rather, the following description provides practical illustrations for implementing exemplary embodiments of the disclosure. Examples of constructions, materials, and dimensions are provided for selected elements, and all other elements employ that which is known to those of ordinary skill in the field of the invention. Those skilled in the art will recognize that many of the noted examples have a variety of suitable alternatives.
Embodiments of the invention include a bone positioning guide and method of positioning bones in a medical procedure. In an exemplary application, embodiments of the bone positioning guide can be useful during a surgical procedure, such as a bone alignment, osteotomy, fusion procedure, and/or other procedures where one or more bones are to be prepared (e.g., cartilage or bone removal and/or cut). Such a procedure can be performed, for example, on bones (e.g., adjacent bones separated by a joint or different portions of a single bone) in the foot or hand, where bones are relatively smaller compared to bones in other parts of the human anatomy. In one example, a procedure utilizing an embodiment of the bone positioning guide can be performed to correct an alignment between a metatarsal (e.g., a first metatarsal) and a second metatarsal and/or a cuneiform (e.g., a medial, or first, cuneiform), such as in a bunion correction surgery. An example of such a procedure is a Lapidus procedure (also known as a first tarsal-metatarsal fusion). In another example, the procedure can be performed by modifying an alignment of a metatarsal (e.g., a first metatarsal). An example of such a procedure is a basilar metatarsal osteotomy procedure.
In the embodiment of
A shaft 30 can be movably connected to the main body member 20 proximate its first end 60. In some embodiments, the shaft 30 includes threads 80 that engage with the main body member 20 such that rotation of the shaft translates the shaft with respect to the main body member. In other embodiments, the shaft can slide within the main body member and can be secured thereto at a desired location with a set screw. In yet other embodiments, the shaft can be moved with respect to the main body by a ratchet mechanism. In the embodiment shown, the shaft moves along an axis that intersects the tip 50. In other embodiments, such as that described with respect to
As shown in
In some embodiments, bone engagement member 40 includes a pin or a clamp. Independent of whether bone engagement member 40 includes such pin or clamp, the bone engagement member can engage an anatomical feature of a bone, such as a ridge (e.g., a medial ridge of a first metatarsal). In such embodiments, the engagement generally prohibits rotational movement of the bone with respect to the bone engagement member. In other embodiments, bone may be allowed to rotate with respect to the bone engagement member.
In the embodiment shown, the bone engagement member 40 is provided on an end of the shaft 30. In the embodiment of the shaft shown having threads 80, the bone engagement member 40 can be rotatably coupled to the shaft 30. In such embodiments, as the shaft is rotated relative to the main body member the bone engagement member 40 may or may not rotate with respect to the main body member even as it translates with respect to the main body member along with the shaft 30 and rotates with respect to the shaft. The bone engagement member may oscillate about the shaft 30, but generally does not rotate with respect to bone after contact with the bone.
As shown in
In other embodiments, the mechanism to urge the bone engagement member and the tip towards each other can include a tenaculum or tong structure. In such embodiments, the guide can include a first shaft pivotably connected to a second shaft. A first end of each shaft can include an actuator, such as a handle. A second end of the first shaft can include a bone engagement member, as described above. And a second end of the second shaft can include a tip, as described above. In use, the actuator can be actuated (e.g., squeezed together) to move the bone engagement member and the tip closer together to position bone. Other embodiments of this type may include another set of shafts and another pivoting connection such that the bone engagement member and tip translate towards each other when the actuator is actuated.
In other embodiments, the mechanism to urge the bone engagement member and the tip towards each other can include a rack and pinion structure. In such embodiments, the rack can include a tip, as described above. And the pinion can include a bone engagement member, as described above, and an actuator (e.g., a knob). In use, the actuator can be actuated (e.g., turned about an axis generally perpendicular to a direction of travel) to move the bone engagement member and the tip closer together to position bone.
Embodiments of the bone positioning guide may include any suitable materials. In certain embodiments, the bone positioning guide is fabricated from a radiolucent material such that it is relatively penetrable by X-rays and other forms of radiation, such as thermoplastics and carbon-fiber materials. Such materials are useful for not obstructing visualization of bones using an imaging device when the bone positioning guide is positioned on bones.
Embodiments of the bone positioning guide can be useful in operation for positioning a bone or bones during a medical procedure. Bone positioning can be useful, for instance, to correct an anatomical misalignment of bones and maintain an anatomically aligned position, such as in a bone alignment and/or fusion procedure. In some embodiments, the bone positioning guide is capable of reducing an angle between the first metatarsal and the second metatarsal from over 10 degrees (e.g., up to about 35 degrees) to about 10 degrees or less (e.g., to about 1-5 degrees), including to negative angles of about −5 degrees. In some embodiments, the bone positioning guide is also capable of rotating the first metatarsal about its long axis with respect to the medial cuneiform from a rotational angle of over 4 degrees to a rotational angle of less than 4 degrees (e.g., to about 0 to 2 degrees).
In some embodiments, a bone preparation guide may be provided to facilitate the preparation of a bone. The bone preparation guide can be provided with a bone positioning guide, or either device can be provided or used independently. An example of a bone preparation guide 150 is shown in
In some embodiments, as shown in
An opening 170 can be defined by the body 154 between the first and second guide surfaces. The opening can be an area between the guide surfaces useful for allowing a practitioner to have a visual path to bones during bone preparation and/or to receive instruments. In the embodiment shown, the opening extends across the body and a distance from a surface 172 opposite of the first facing surface 166 to a surface 174 opposite of the second facing surface 168.
The embodiment shown also includes a first end 176 extending from the body 154 in a first direction and a second end 178 extending from the body in a second direction. The second direction can be different than the first direction (e.g., an opposite direction). As shown, each of the first end and the second end can include at least one fixation aperture 180 configured to receive a fixation pin (not shown in
The bone preparation guide 150 can also include a first adjustable stabilization member 182 engaged with the first end 176. In some embodiments, the bone preparation guide can include a second adjustable stabilization member 184 engaged with the second end 178. Each of the members can be threaded and engage a threaded aperture defined by the ends. The elevation of each end can be adjusted with respect to a bone by adjusting the stabilization member. In some embodiments, as shown, the stabilization members are cannulated such that they can receive a fixation pin.
As shown in
As shown in
Embodiments of the bone preparation guide can be useful in operation for guiding a preparation of a bone or bones at a targeted anatomy. Bone preparation can be useful, for instance, to facilitate contact between leading edges of adjacent bones, separated by a joint, or different portions of a single bone, separated by a fracture, such as in a bone alignment and/or fusion procedure. A bone may be prepared using one or more bone preparation techniques. In some applications, a bone is prepared by cutting the bone. The bone may be cut transversely to establish a new bone end facing an opposing bone portion. Additionally or alternatively, the bone may be prepared by morselizing an end of the bone. The bone end can be morselized using any suitable tool, such as a rotary bur, osteotome, or drill. The bone end may be morselized by masticating, fenestrating, crushing, pulping, and/or breaking the bone end into smaller bits to facilitate deformable contact with an opposing bone portion.
Embodiments of the present invention also include methods for temporarily fixing an orientation of a bone or bones, for example, prior to or in conjunction with permanently fixing the orientation of the bone or bones. In general, the method of positioning a bone includes the steps of moving a bone from an anatomically misaligned position to an anatomically aligned position with respect to another bone and preparing an end of the moved bone and a facing end of another bone. In some embodiments, the end of at least one of the moved bone and the other bone is prepared after moving the bone into the aligned position. In certain embodiments, the bone is anatomically aligned in more than one plane with respect to another bone by applying a force to one bone at a single location, such that the bone both translates and rotates in response to the force. In certain embodiments, the moving step can be accomplished with a bone positioning device and/or the preparing step can be accomplished with a bone preparation guide, as described herein. In other embodiments, the moving step can be accomplished by a clinician physically grasping a bone, either through direct contact with the bone or indirectly (e.g., by inserting a K-wire, grasping with a tenaculum, or the like), and moving his hand to move the bone. In these applications, a fulcrum may be used to control movement of the bone, as also described herein.
Each of the three potential planes of deformity will now be described in isolation.
A specific embodiment of a method in accordance with an embodiment of the invention includes the steps of engaging a bone engagement member with a first bone, placing a tip of the bone positioning guide in apposition to a second bone, the second bone being different from the first bone, and moving the bone engagement member with respect to the tip to change the position of the first bone with respect to the second bone in more than one plane. In some embodiments, after alignment, at least one of an end of the first bone and a facing end of a third bone are prepared (e.g., only the end of the first bone or both the end of the first bone and the end of the second bone), optionally using a preparation guide.
In some embodiments, the method includes the step of mobilizing a joint for a corrective procedure. For example, after creating surgical access to the joint and before moving the bones into an aligned position, tissue can be released to allow a bone, such as a metatarsal, to rotate freely. In some embodiments, obstructing bone may be excised (e.g., a dorsolateral flare of the metatarsal base, a plantar flare of the metatarsal base (sometimes referred to as a plantar condyle), part of an end of a metatarsal facing a cuneiform, or osteophyte) to further promote free rotation by creating relatively flat surfaces with respect to a frontal plane. An example of a dorsolateral flare F on a first metatarsal 210 of a foot 200 is shown in
Embodiments of methods in accordance with the invention can also include steps performed after preparing the ends of the bones. For example, the ends of the bones may be placed in apposition and optionally compressed together and the position of the bones can be fixed with one or more bone fixation devices (e.g., compressing bone screw, bone plate, bone staple, external fixator, intramedullary implant or nail) prior to a closing of the surgical access to the joint.
An exemplary method will now be described with respect to
After customary surgical preparation and access, a bone preparation instrument 296 can be inserted into the joint (e.g., first tarsal-metatarsal joint) to release soft tissues and/or excise the plantar flare from the base of the first metatarsal 210, as shown in
An incision can be made and a tip 50 of a bone positioning guide 10 can be inserted on the lateral side of a metatarsal other than the first metatarsal 210, such as the second metatarsal 292. As shown in
As depicted in
As depicted in
As shown in
As depicted in
In some embodiments, the location of the intersection of the tissue removing instrument and the bone to be prepared is confirmed before bone preparation. In one embodiment, a tissue removing instrument location check member can be engaged with the preparation guide to visually confirm where a tissue removal instrument will contact the bone. In another embodiment, a tissue removal instrument is engaged with the preparation guide to visually confirm where the instrument will contact the bone. In either embodiment, such visual confirmation can include the use of an imaging device, such as an X-ray. If the position of the preparation guide is correct, additional fixation pins may be inserted through the apertures (e.g., angled apertures) to further fix the position of the preparation guide with respect to the first metatarsal and the medial cuneiform. In some embodiments, the spacer is reattached prior to further bone preparation steps.
In some embodiments, the end of the first metatarsal 210 facing the medial cuneiform 220 can be prepared with a tissue removing instrument 296 guided by a guide surface of bone preparation guide 150 (e.g., inserted through a slot defined by a first guide surface and a first facing surface). Additionally or alternatively, the end of the first metatarsal 210 facing the medial cuneiform 220 can be prepared by morselizing the end of the first metatarsal. In some embodiments, the first metatarsal 210 end preparation is done after the alignment of the bones, e.g., by actuating bone positioning guide 10 before preparing the end of first metatarsal 210. In other embodiments, the first metatarsal 210 end preparation is done before the alignment of the bones, e.g., by preparing the end of the first metatarsal 210 before actuating bone positioning guide 10.
In addition, as shown in
Any angled/converging pins can be removed and the bone preparation guide 150 can be lifted off the parallel pins 270, as shown in
The tissue (e.g., bone or cartilage slices) from the first metatarsal and the medial cuneiform can be removed from the joint site and the joint surfaces can be fenestrated, if desired. If the bone positioning guide was taken off the foot, it can be put back on, as shown in
After preparation, the ends of the two bones can be placed in apposition and optionally compressed together by provisionally fixating the joint. For example, the two bones may be placed in apposition by placing the cut and/or morselized end of the first metatarsal 210 in abutment with the cut and/or morselized end of the medial cuneiform 220. In some examples, the cut and/or morselized end of the first metatarsal 210 is placed adjacent to, and optionally in contact with, the cut and/or morselized end of the medial cuneiform 220.
As shown in
Although they can be left in place, in some embodiments the parallel reference pins and bone positioning guide can be removed and a bone fixation device (e.g., two bone plates positioned in different planes, as shown) can be applied to stabilize the joint for fusion.
As shown in
Methods in accordance with embodiments of the invention can be useful for positioning a bone or bones. Bone positioning can be useful, for instance, to correct an anatomical misalignment of bones and maintain an anatomically aligned position, such as in a bone alignment and/or fusion procedure. In some embodiments, an “anatomically aligned position” means that an angle of a long axis of a first metatarsal relative to a long axis of a second metatarsal is about 10 degrees or less in the transverse plane or sagittal plane. In certain embodiments, anatomical misalignment can be corrected in both the transverse plane and the frontal plane. In the transverse plane, a normal intermetatarsal angle (“IMA”) between a first metatarsal and a second metatarsal may be less than about 9 degrees (e.g., less than 6 degrees). An IMA of between about 6 degrees and about 13 degrees (e.g., between about 9 degrees and about 13 degrees) may be considered a mild or moderate misalignment of the first metatarsal relative to the second metatarsal. An IMA of greater than about 16 degrees may be considered a severe misalignment of the first metatarsal relative to the second metatarsal. In some embodiments, methods in accordance with the invention are capable of anatomically aligning the bone(s) by reducing the IMA from over 10 degrees to about 10 degrees or less (e.g., to an IMA of less than 6 degrees, such as to an IMA of about 1-5 degrees), including to negative angles of about −5 degrees or until interference with the second metatarsal, by positioning the first metatarsal at a different angle with respect to the second metatarsal.
With respect to the frontal plane, a normal first metatarsal will be positioned such that its crista prominence is generally perpendicular to the ground and/or its sesamoid bones are generally parallel to the ground and positioned under the metatarsal. This position can be defined as a metatarsal rotation of 0 degrees. In a misaligned first metatarsal, the metatarsal is axially rotated between about 4 degrees to about 30 degrees or more. In some embodiments, methods in accordance with the invention are capable of anatomically aligning the metatarsal by reducing the metatarsal rotation from about 4 degrees or more to less than 4 degrees (e.g., to about 0 to 2 degrees) by rotating the metatarsal with respect to the medial cuneiform.
While various embodiments of bone positioning and preparing guide systems and methods have been described, it should be appreciated that the concepts of the disclosure can be altered in practice, e.g., based on the needs of the clinician, the patient undergoing the bone repositioning procedure, the specific anatomy being treated, and/or the target clinical outcome. As one example, the described systems and techniques may be modified to utilize a fulcrum about which rotation and/or pivoting of one bone relative to another bone occurs, e.g., with or without use of bone positioning guide 10. The fulcrum can establish and/or maintain space between adjacent bones being moved, e.g., compressed between bone engagement member 40 and tip 50 when using bone positioning guide 10, preventing lateral translation or base shift of the bones during rotation and/or pivoting.
To help avoid the base shift and offset 354B observed in
When used, the clinician can insert fulcrum 356 between first metatarsal 210 and second metatarsal 292 (or other adjacent bones, when not performing a metatarsal realignment) at any time prior to moving the first metatarsal (e.g., by actuating bone positioning guide 10 or other means of manipulating the bone). In different embodiments, fulcrum 356 can be inserted between first metatarsal 210 and second metatarsal 292 before or after inserting joint spacer 188 and/or placing bone preparation guide 150 over the joint being operated upon. In one embodiment, the clinician prepares the joint being operated upon to release soft tissues and/or excise the plantar flare from the base of the first metatarsal 210, as discussed above. Either before or after installing bone positioning guide 10 over adjacent bones, for example with bone engagement member 40 positioned in contact with the medial ridge of the first metatarsal 210 and tip 50 positioned in contact with second metatarsal 292, the clinician inserts fulcrum 356 at the joint between the first metatarsal and the second metatarsal. The clinician can subsequently actuate bone positioning guide 10 (e.g., rotate knob 120). In the case of a left foot as shown in
In instances in which fulcrum 356 is used, any suitable mechanical instrument that maintains a spacing between adjacent bones can be used for the fulcrum.
While
As discussed above, bone positioning guide 10 can have a variety of different configurations, including a configuration in which bone engagement member 40 is laterally offset from tip 50.
As discussed above with respect to
In practice, once bone preparation guide 150 is placed over joint spacer 188, the guide slots of the bone positioning guide may not be perfectly aligned with the ends of the bones (e.g., first metatarsal 210 and medial cuneiform 220) to be cut through the guide slots. Accordingly, in other configurations, opening 170 of bone preparation guide 150 may not be sized and/or shaped and/or indexed to joint spacer 188. In other words, opening 170 of bone preparation guide 150 may have a different cross-sectional size and/or shape than the cross-sectional size and/or shape of joint spacer 188. In these configurations, bone preparation guide 150 may actuate or rotate about an axis extending through the length of joint spacer 188. As a result, after the clinician places bone preparation guide 150 over joint spacer 188, the clinician may rotate bone preparation guide 150 around joint spacer 188 until the guide slots of the bone preparation guide are better aligned with the ends of the bones to be cut (e.g., first metatarsal 210 and medial cuneiform 220). Depending on the configuration of opening 170 of bone preparation guide 150 and the configuration of joint spacer 188, the guide may rotate freely (e.g., 360 degrees) around the joint spacer (e.g., seeker) or within a bounded angular range (e.g., from plus 20 degrees to minus 20 degrees from a normal position).
In other configurations, opening 170 of bone preparation guide 150 may be size and/or shape indexed to the cross-sectional size and/or shape of joint spacer 188 but still provide relative rotation between the two components. For example, opening 170 may have a circular cross-section sized and shaped to receive proximal portion 370 of joint spacer 188 from
In embodiments where bone preparation guide 150 can rotate relative to joint spacer 188, the bone positioning guide and/or joint spacer may include a locking mechanism that is engageable to lock the rotational angle of the bone positioning guide relative to the joint spacer. For example, bone preparation guide 150 may include a set screw with thumb wheel that can be rotated, causing a distal end of the set screw to bear against or retract away from joint spacer 188. In use, a clinician can rotate bone preparation guide 150 around joint spacer 188 until the guide slots of the bone preparation guide are best aligned with the ends of the bones to be cut (e.g., first metatarsal 210 and medial cuneiform 220). The clinician can then engage the locking mechanism to prevent further rotation of bone preparation guide 150 relative to joint spacer 188 before performing further steps of the procedure.
A bone correction procedure can be accomplished using one or more instruments according to the disclosure. In some applications, a bone correction procedure, such as a tarsal-metatarsal joint fusion procedure to correct a bunion deformity, is performed utilizing a fulcrum as a pivot point. The first metatarsal is moved relative to a second metatarsal about the fulcrum without utilizing bone positioning guide 10. In these applications, the clinician can insert the fulcrum into an intermetatarsal space between the first and second metatarsals and physically grasp the first metatarsal and move the metatarsal about the fulcrum. For example, the clinician may directly grasp the first metatarsal with his hand or indirectly grasp the first metatarsal through an intermediate tool, such as a K-wire or pin inserted into the first metatarsal, a tenaculum or tongs, or other grasping instrument. Thereafter, the clinician may translate his hand relative to the foot of the patient being operated upon to move the first metatarsal about the fulcrum and relative to the second metatarsal, e.g., to anatomically align the first metatarsal with respect to the second metatarsal.
The technique of
The technique of
Independent of the specific technique used to prepare the end of the first metatarsal and/or the opposed end of the medial cuneiform (504), the technique of
As the first metatarsal pivots in the transverse plane toward the second metatarsal, closing the intermetatarsal space, a proximal portion of the first metatarsal may contact and press against the fulcrum, thereby causing the fulcrum to contact and press against a proximal portion of the second metatarsal. The fulcrum may function to maintain spacing between the proximal portion of the first metatarsal and proximal portion of the second metatarsal, e.g., such a spacing equal to the width of the fulcrum. This may help reduce or eliminate shifting or translation of the base of the first metatarsal toward the base of the second metatarsal during pivoting.
In some applications of the technique of
In some applications of the technique of
After suitably moving the first metatarsal relative to the second metatarsal, the joint between the first metatarsal and medial cuneiform may be provisionally fixated (508). In one example, a fixation wire is driven into the first metatarsal and the medial cuneiform to provisionally fixate the joint. In another example, a compression pin, such as a threaded olive pin, is inserted through the first metatarsal and into the medial cuneiform to provide compression and provisional fixation between the first metatarsal and the medial cuneiform. The fulcrum can be removed from the intermetatarsal space before or after provisionally fixating the joint.
Following optional provisional fixation, the corrected position of the first metatarsal can be permanently fixated by fixing the position of the first metatarsal with respect to the medial cuneiform (510). One or more bone plates can be applied across the tarsal-metatarsal joint and the provisional fixation hardware removed. For example, a first bone plate may be positioned on a dorsal-medial region of the first metatarsal and on the medial cuneiform while a second bone plate is positioned on a medial-plantar region of the first metatarsal and on the medial cuneiform. In these applications, the second bone plate may or may not be a helical-shaped bone plate extending from a medial region of the medial cuneiform to a plantar region of the first metatarsal across the joint.
As discussed above with respect to
Body 380 can be configured (e.g., sized and shaped) to be inserted into an intermetatarsal space between adjacent metatarsals. For example, body 380 may be configured to be inserted between a first metatarsal and a second metatarsal. Body 380 is illustrated as having a rectangular shape with a length 383 greater than its width 384 and thickness 386. Moreover, in this configuration, body 380 has a constant width 384 across its length but has a thickness 386 that that tapers along at least a portion of the length from the leading end 388 to the trailing end 390. For example, body 380 may have a tapered leading end 388 to facilitate insertion of fulcrum 356 in a space between adjacent metatarsals. In other configurations, body 380 may have a constant thickness across is length or may define a different generally polygonal shape (e.g., square, hexagonal) and/or generally arcuate shape (e.g., circular, elliptical).
Fulcrum 356 in
With further reference to
In the illustrated example, handle 382 includes a grip portion 398 and a handle body 402. The grip portion 398 can provide a surface that a clinician physically grips to insert fulcrum 356 into an intermetatarsal space. For example, grip portion 398 may contain knurling or other anti-friction surfacing texturing to allow the clinician to help grip the fulcrum. Handle body 402 may be positioned between the body 380 of fulcrum 356 and grip portion 398. Handle body 402 may or may not have a reduced cross-sectional width compared to body 380 and/or grip portion 398, as illustrated.
When configured with grip portion 398, the grip portion can be co-linear with handle body 402 or may be offset relative to the handle body. When grip portion 398 is offset from handle body 402, a grip axis 404 extending along the length of the grip portion may intersect the handle axis 393 at an acute ranging from 20 degrees to 75 degrees, such as 35 degrees to 55 degrees, although other angular arrangements can also be used. In the illustrated configuration, grip axis 404 is perpendicular to the axis 394 defined by body 380. Accordingly, when inserted into an intermetatarsal space, retracted tissue may be bounded by a laterally-facing side of body 380, by the lower surface of grip portion 393, and in the dorsal-lateral direction by handle portion 392.
In some examples, the bone-contacting faces of body 380 are configured to inhibit and/or facilitate relative motion between a bone and the respective bone-contacting face. With reference to
Additionally or alternatively, the body 380 may have different surface features on the opposite face from first face 410. With reference to
In the configuration of
In
In general, configuring the first fulcrum body 380 and second fulcrum body 420 with different thicknesses can be useful to facilitate use in different sized intermetatarsal spaces. For example, the clinician may select one sized fulcrum body over the other sized fulcrum body based on the anatomy (e.g., intermetatarsal space sizing) of the patient undergoing a surgical procedure. If the clinician determines upon beginning to insert the selected fulcrum that the selected fulcrum is inappropriately sized, the clinician may retract the fulcrum, flip the instrument, and insert the fulcrum on the opposite side of the instrument.
While the first fulcrum body 380 and second fulcrum body 420 can be configured with a variety of different sizes, in some examples, each fulcrum body has a thickness ranging from 0.5 millimeters to 12 millimeters, such as from 1 millimeter to 10 millimeters, or from 1 millimeter to 5 millimeters. The thickness 424 of the second fulcrum body 420 may be at least 0.2 millimeters thicker than the thickness 386 of the first fulcrum body, such as at least 0.5 millimeters thicker, at least 1 millimeter thicker, or at least 2 millimeters thicker. In some examples, first fulcrum body 380 and second fulcrum body 420 each have a width within a range from 5 millimeters to 15 millimeters (e.g., about 6 millimeters to about 10 millimeters) and a length ranging from 10 millimeters to 30 millimeters, although other dimensions can be used.
In the illustrated example of
When fulcrum 356 is implemented with first fulcrum body 380 and second fulcrum body 420, the bone-contacting faces of one or both of the fulcrum bodies may be configured to inhibit and/or facilitate relative motion between a bone and the respective bone-contacting face, as discussed with respect to
In the illustrated example, first fulcrum body 380 and second fulcrum body 420 are oriented at a non-zero degree relative to each other and separated by a handle body 402, e.g., of lesser cross-sectional width. For example, as discussed with respect to
In yet other configurations where fulcrum 356 is configured with multiple ends of different dimensions, the ends may or may not be separated by a separate handle body 402. For example, first fulcrum body 380 and second fulcrum body 420 may be formed as a unitary structure (e.g., as opposed ends of a linear or curved unitary body).
Embodiments of the invention also include a disposable, sterile kit that includes an embodiment of a bone positioning guide and/or bone preparation guide and/or fulcrum described herein. Other components that may be included within the sterile kit include bone fixation devices.
Thus, embodiments of the invention are disclosed. Although the present invention has been described with reference to certain disclosed embodiments, the disclosed embodiments are presented for purposes of illustration, and not limitation, and other embodiments of the invention are possible. One skilled in the art will appreciate that various changes, adaptations, and modifications may be made without departing from the spirit of the invention.
This application is a continuation of U.S. patent application Ser. No. 15/236,464, filed Aug. 14, 2016, which in turn claims the benefit of U.S. Provisional Application No. 62/293,189, filed Feb. 9, 2016, and is a continuation-in-part of U.S. patent application Ser. No. 14/981,335, filed Dec. 28, 2015, now U.S. Pat. No. 9,622,805, issued Apr. 18, 2017, which claims the benefit of U.S. Provisional Application No. 62/205,338, filed Aug. 14, 2015. The entire contents of all these applications are incorporated herein by reference.
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| Number | Date | Country | |
|---|---|---|---|
| 20190328436 A1 | Oct 2019 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62293189 | Feb 2016 | US | |
| 62205338 | Aug 2015 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15236464 | Aug 2016 | US |
| Child | 16505363 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14981335 | Dec 2015 | US |
| Child | 15236464 | US |
