Surgical device with widened anvil

Abstract

The present invention provides a surgical stapler, wherein the surgical stapler includes an anvil portion, a part of a tissue contacting surface of the anvil portion on one side of a staple-forming recess has a first width, a part of the tissue contacting surface on the other side of the staple-forming recess has a second width, and the first width is greater than the second width. This configuration allows as much as possible for a certain error when firing a retaining pin. For example, even if the retaining pin is not accurately received by a retaining pin recess, an end portion of the retaining pin will abut against the increased tissue contacting surface of the anvil portion without missing the anvil portion and entering tissue. The retaining pin abuts against the enlarged tissue contacting surface, thereby resisting actuation of the anvil portion and a staple cartridge toward a closed configuration, which can enable an operator to perceive abnormal actuation of a guide pin. In addition, the retaining pin abutting against the tissue contacting surface of the anvil portion may be returned to the retaining pin recess with subsequent slight shaking or a similar operation, to allow for subsequent surgical procedures.

Description

[0001] SURGICAL DEVICE WITH WIDENED ANVIL

[0002] TECHNICAL FIELD

[0003] The present invention relates to the technical field of surgical instruments, and specifically relates to a surgical stapler / anastomosis stapler.

[0004] BACKGROUND OF THE INVENTION

[0005] Surgical staplers / anastomosis staplers are often used to deploy staples into tissue to reduce or eliminate tissue bleeding. For example, when tissue is cut, it needs to be sutured to promote healing. A surgical stapler / anastomosis stapler (such as a linear stapler / anastomosis stapler or an arc-type stapler / anastomosis stapler, for example) may include an end effector assembly having a staple cartridge and a staple anvil portion. The end effector assembly can secure tissue between the staple cartridge and the anvil, wherein the staple cartridge includes a staple cartridge configured to be capable of removably storing surgical staples therein, and the anvil includes a staple-forming recess for shaping staples. Such a surgical stapler / anastomosis stapler typically includes a closure system that moves one of the staple cartridge and the anvil relative to the other.

[0006] As described above, the surgical stapler / anastomosis stapler may be configured to close the staple cartridge and the anvil of the end effector assembly into a closed configuration, so as to capture tissue between the staple cartridge and the anvil. In the closed configuration, the staple cartridge and the anvil apply a clamping force to the tissue, so as to retain the tissue between the anvil and the staple cartridge. Then, staples are driven to be deployed from the staple cartridge and deform against the staple-forming recess of the anvil, thereby securing tissue layers together. The staples are typically deployed in several staple lines or rows, so as to more reliably secure the tissue layers together. The end effector assembly may or may not include a cutting member that can be advanced between the staple rows to cut the tissue after the tissue layers have been sutured together.

[0007] As shown in FIG. 1, an existing end effector 16 is shown. A U-shaped distal support structure 48 defining the end effector 16 has a staple cartridge mounting portion 52 that removably receives a staple cartridge 160. The end effector 16 is also configured to laterally receive or “reload” tissue within a gap defined between a cartridge housing 162 of the staple cartridge 160 and an anvil 210 mounted within the end effector 16. The end effector 16 further includes a retaining pin 176, and the retaining pin 176 can extend distally from the staple cartridge 160 in the direction of the arrow in the figure, so as to capture tissue between the anvil 210 and the cartridge housing 162. The retaining pin may be pushed by a handle end of a surgical stapler, as shown in FIG. 1, or may be pushed by a user at the end effector, so that the retaining pin is received by a corresponding position of the anvil. However, the retaining pin can easily deviate from an intended target, and once the retaining pin deviates, it will miss the anvil and drive into the tissue around the anvil, which will not only fail to achieve the subsequent surgical purpose, but also may cause damage to the tissue.

[0008] Therefore, there is a need to provide a surgical stapler so as to at least partially address the described problems.

[0009] SUMMARY OF THE INVENTION

[0010] The present invention provides a surgical stapler with a widened anvil portion. Specifically, a retaining pin recess is provided on the anvil portion to be offset to a side on which the anvil portion is expanded outwardly as a whole, thereby obtaining a larger width. This configuration allows as much as possible for a certain error when firing a retaining pin. For example, even if the retaining pin is not accurately received by a retaining pin recess, an end portion of the retaining pin will abut against the increased tissue contacting surface of the anvil portion without missing the anvil portion and entering tissue. The retaining pin abuts against the increased tissue contacting surface, thereby applying a distally directed counter-pushing force to the anvil. The movement of actuation of the anvil portion and the staple cartridge toward the closed configuration is blocked, or the anvil portion and cartridge cannot be actuated to the closed configuration, which can enable an operator to perceive abnormal actuation of a guide pin. In addition, the retaining pin abutting against the tissue contacting surface of the anvil portion may be returned to the retaining pin recess with subsequent slight shaking or a similar operation, to allow for subsequent surgical procedures.

[0011] According to one aspect of the present invention, there is provided a surgical stapler, comprising a handle assembly for an operator to hold and an end effector located at a distal end of the handle assembly in a first direction, the end effector comprising an anvil portion and a staple cartridge configured to be movable relative to each other in the first direction between an open configuration and a closed configuration, and the anvil portion being formed in an elongated shape extending in a second direction perpendicular to the first direction, Wherein the surgical stapler is configured to enable surgical staples in the staple cartridge to be fired toward the anvil portion, and a staple-forming recess for receiving and shaping the surgical staples and a retaining pin recess for receiving a retaining pin provided on the staple cartridge are formed in a tissue contacting surface of the anvil portion facing the staple cartridge; and

[0012] Wherein the staple-forming recess has a center line extending along the second direction, the retaining pin recess is offset to one side with respect to the center line, a part of the tissue contacting surface on the one side of the staple-forming recess has a first width, a part of the tissue contacting surface on the other side of the staple-forming recess has a second width, and the first width is greater than the second width.

[0013] In an embodiment, the anvil portion comprises an anvil plate which is an integrated member and the surface of which facing the staple cartridge constitutes the tissue contacting surface.

[0014] In an embodiment, the first width is greater than or equal to 2.5 mm, and the second width is greater than or equal to 1.5 mm.

[0015] In an embodiment, the first width is 2.5 mm to 3.0 mm, and the second width is 1.5 mm to 2 mm.

[0016] In an embodiment, the one side of the tissue contacting surface has a left boundary line extending in the second direction, and the other side of the tissue contacting surface has a right boundary line extending in the second direction, wherein a distance between the retaining pin recess and the left boundary line is greater than or equal to 1.3 mm, and a distance between the retaining pin recess and the right boundary line is greater than or equal to 2.8 mm.

[0017] In an embodiment, the distance between the retaining pin recess and the left boundary line is 1.3 mm to 1.6 mm, and the distance between the retaining pin recess and the right boundary line is 2.8 mm to 3.1 mm.

[0018] In an embodiment, the anvil portion comprises a support member comprising a support body mounted in the anvil portion and a cap portion exposed to the outside, the cap portion is located entirely on one side of the anvil plate in the second direction, and a width of a joint between the cap portion and the anvil plate is consistent with a width of the anvil plate. In an embodiment, the cap portion has a width that tapers in a direction away from the anvil plate, and a dimension of the cap portion in the first direction also tapers in a direction away from the anvil plate.

[0019] In an embodiment, the support member is made of plastic, and the anvil plate is made of stainless steel.

[0020] In an embodiment, the surgical stapler comprises a shaft assembly extending distally from the handle assembly; a support part for mounting the staple cartridge is formed at a distal end of the shaft assembly; the surgical stapler comprises a first side workpiece and a second side workpiece clamped together in a third direction; the first side workpiece is on a same side of the retaining pin recess with respect to the center line; a connecting section is provided between the anvil portion and the support part; and the first side workpiece forms an integrated first side surface of the anvil portion, the connecting section and the support part, wherein the integrated first side surface is planar, and the first direction, the second direction and the third direction are orthogonal.

[0021] In an embodiment, the second side workpiece forms an integrated second side surface of the anvil portion, the connecting section and the support part, the second side surface having a step thereon.

[0022] In an embodiment, the anvil portion has a uniform width throughout the second direction.

[0023] In an embodiment, a trigger for operably firing the surgical staples is provided on the handle assembly, and a retaining pin operating component for operably firing the retaining pin is provided on the end effector.

[0024] In an embodiment, a chamfered feature structure for guiding the retaining pin into the retaining pin recess is formed on the periphery of the retaining pin recess.

[0025] In an embodiment, the chamfered feature structure comprises a continuous annular part surrounding the retaining pin recess.

[0026] BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention, together with the features and advantages thereof, may be better understood with reference to the following description of exemplary embodiments of the present invention in conjunction with the drawings. In the following description and drawings, similar components are denoted by similar numerals. The drawings are not necessarily to scale, some components may be omitted for clarity and conciseness, and some of the drawings may be drawn in an exaggerated or diagrammatic manner.

[0028] FIG. 1 shows an end effector of an existing surgical stapler;

[0029] FIG. 2 is a perspective view illustratively showing a surgical stapler according to an embodiment of the present invention;

[0030] FIG. 3 is an enlarged view of a part of an end effector in FIG. 2;

[0031] FIG. 4 is a front view of the end effector in FIG. 3;

[0032] FIG. 5 is a view of another side surface of the end effector in FIG. 3;

[0033] FIG. 6 is a side view of an anvil portion of the end effector in FIGS. 2-5;

[0034] FIG. 7 is a partial enlarged view of FIG. 6;

[0035] FIG. 8A is a separate perspective view of an anvil plate in FIG. 6; and

[0036] FIGS. 8B-8G are six views of the anvil plate in FIG. 6, wherein FIG. 8B is a front view of the anvil plate, FIG. 8C is a back view of the anvil plate, FIG. 8D is a left side view of the anvil plate, FIG. 8E is a right side view of the anvil plate, FIG. 8F is a top view of the anvil plate, and FIG. 8G is a bottom view of the anvil plate.

[0037] DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0038] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described herein are merely exemplary embodiments according to the present invention, and on the basis of the exemplary embodiments, those skilled in the art could conceive of other modes capable of implementing the present invention, which also fall within the scope of the present invention.

[0039] FIGS. 2-8G illustratively show a surgical stapler according to an embodiment of the present invention. First of all, it should be noted that the directional terms and position terms mentioned in the present invention should be construed as relative directions and relative positions, rather than absolute directions and absolute positions. The directional terms and position terms mentioned in the present invention may be understood with reference to the orientation of the surgical stapler in FIGS. 2-7. A “first direction DI”, a “second direction D2”, and a “third direction D3” mentioned in the present invention are three directions orthogonal to each other in space. In the orientation of the surgical stapler as shown in FIG. 1, the “first direction DI” and the “third direction D3” are substantially horizontal directions, the “second direction D2” is substantially understood to be a vertical direction, and the “first direction DI” may be understood to be a direction in which a distal direction (referring to a direction away from an operator) or a proximal direction (referring to a direction closer to the operator) is located. Unless otherwise defined, a “width” as used herein refers to the dimension of a component in the third direction D3.

[0040] First of all, with reference to FIG. 2, what is shown is an exemplary right-angle linear surgical stapler configured to suture and cut tissue in a variety of non-endoscopic (“open”) surgical procedures (including, for example, colorectal, thoracic, and bariatric procedures). The surgical stapler 100 (also referred to as a “right-angle linear cutter”) generally includes a handle assembly 20, a shaft assembly 24 extending distally from the handle assembly 20, and an end effector 30 located at a distal end portion of the shaft assembly 24. The end effector 30 is provided with a “right angle” configuration such that the end effector 30 grips, sutures, and cuts tissue in a plane extending transversely at a right angle to a longitudinal axis defined by the shaft assembly.

[0041] The handle assembly 20 includes a housing 21 defining a pistol grip 23, and a pair of pivotable triggers 22, which may include a closure trigger and a firing trigger. The closure trigger and the firing trigger are operably coupled to the end effector 30 via the shaft assembly 24, so that the end effector 30 is configured to be able to close and thereby clamp tissue in response to the actuation of the closure trigger and subsequently suture and cut the tissue in response to actuation of the firing trigger.

[0042] The end effector 30 includes an anvil portion 32 and a staple cartridge. The staple cartridge in the present embodiment is not shown in FIGS. 2-8G, but reference may be made to the general structure and position of the staple cartridge 160 of the end effector 16 shown in FIG. 1. The distal end of the shaft assembly 24 is provided with a support part 31 for mounting the staple cartridge. The anvil portion 32 and the staple cartridge are configured to be movable with respect to each other in a first direction DI between an open configuration and a closed configuration, and the anvil portion 32 is formed having an elongated shape extending in a second direction D2 perpendicular to the first direction DI.

[0043] The surgical stapler 100 is provided with several actuation systems for operating the end effector 30 via the handle assembly 20 during a surgical procedure on a patient. Specifically, the surgical stapler 100 includes: a retaining pin actuation system, a closure system, and a firing system. The retaining pin actuation system is operable to push a retaining pin distally to realize initial retention of tissue within the end effector 30. The retaining pin in the present embodiment is not shown in FIGS. 2-8G, but reference may be made to the general structure and position of the retaining pin 176 of the end effector 16 shown in FIG. 1. The closure system is operable to clamp the tissue with the end effector 30. The firing system is operable to subsequently suture and cut the tissue using the end effector 30. While the teaching contents of the present invention are shown and described in the context of a “linear” surgical stapler 100 that is configured to be able to apply linear rows of staples and linear cutting lines in tissue, it should be understood that any one or more of the teachings of the present invention may be applied to surgical staplers configured to able to apply rows of staples and tissue cutting lines having non-linear (e.g., curved) configurations, such as surgical staplers of the type disclosed in any one or more reference documents incorporated herein by reference.

[0044] With reference to FIGS. 3-5, the end effector is configured to fire a surgical staple toward the anvil portion 32 under the action of the firing system, and a staple-forming recess 323 for receiving and shaping the surgical staple and a retaining pin recess 324 for receiving the retaining pin are formed in the tissue contacting surface of the anvil portion 32 facing the staple cartridge, namely, facing a proximal side. The staple-forming recess 323 has a center line X extending in the second direction D2. In the present embodiment, there are two rows of staple-forming recesses 323, i.e., a first row of staple-forming recesses 3231 and a second row of staple-forming recesses 3232, each row of staple-forming recesses 323 extending in the second direction D2. The two rows of staple-forming recesses 323 are arranged side by side in the third direction D3, and the center line X of the present embodiment is located between the two rows of staple-forming recesses 323. In other embodiments, more rows of staple-forming recesses 323 may be provided, and the center line X is located at the exact center of all the rows of staple-forming recesses 323 in the third direction D3.

[0045] With reference to FIGS. 6-7, the retaining pin recess 324 is offset to one side with respect to the center line X. From the perspective of FIGS. 6-7, the retaining pin recess 324 is located slightly on the left half of the tissue contacting surface. To enable the anvil portion 32 to abut against and block the end portion of the retaining pin when the retaining pin is fired and the retaining pin is not accurately received by the retaining pin recess 324, the left side half of the anvil portion 32 is expanded leftward as a whole. In other words, a part of the tissue contacting surface on the left side of the staple-forming recesses 323 has a first width W1 (the first width W1 being the minimum distance between the staple-forming recesses 323 and the left boundary line 325 of the tissue contacting surface), a part of the tissue contacting surface on the right side of the staple-forming recesses 323 has a second width W2 (the second width W2 being the minimum distance between the staple-forming recesses 323 and the right boundary line 326 of the tissue contacting surface), and the first width W1 is greater than the second width W2.

[0046] In particular, in some embodiments, the first width W1 is greater than or equal to 2.5 mm, and preferably, it is 2.5 mm to 3.0 mm; the second width W2 is greater than or equal to 1.5 mm, and preferably, it is 1.5 mm to 2 mm. It should be noted that there may be a chamfer at the edge of each staple-forming recess 232, and in the present embodiment, both the first width W 1 and the second width W2 may be measured from the outer contour line of the chamfer of the staple-forming recess 232. However, due to the small dimensions of the chamfer, in some embodiments the first width and the second width may also be measured from the inner contour line of the chamfer of the staple-forming recess.

[0047] With continued reference to FIG. 7, preferably, a chamfered feature structure 3241 for guiding the retaining pin into the retaining pin recess 324 is formed on the outer periphery of the retaining pin recess 324, and the chamfered feature structure 3241 may, for example, be of a continuous annular shape around the retaining pin recess 324, so that the tip of the retaining pin can be guided by the chamfered feature structure 3241 into the retaining pin recess 324 wherever it abuts against around the retaining pin recess 324. In other nonillustrated embodiments, the chamfered feature structure 3241 may also have other forms. For example, the chamfered feature structure may be provided only on the left side of the retaining pin recess.

[0048] In the present embodiment, the anvil portion 32 includes an integrated anvil plate 321 (which may also be referred to as an anvil), the tissue contacting surface of the anvil portion 32 is completely formed on the anvil plate 321, and both the staple-forming recess 323 and the retaining pin recess 324 are formed on the anvil plate 321. To achieve the widening of the left side of the anvil portion 32, the anvil plate 321 actually also has a larger width, in particular in the region on the left side of the staple-forming recess 323. The left half region of the tissue contacting surface in which the retaining pin recess 324 is located is widened, so that the distance from the retaining pin recess 324 to the left boundary line of the tissue contacting surface is also increased. However, due to the eccentric setting of the retaining pin recess 324, the distance from the retaining pin recess 324 to the left boundary line may still be smaller than the distance from the retaining pin recess to the right boundary line. For example, the distance SI between the retaining pin recess 324 and the left boundary line 325 is greater than or equal to 1.3 mm, and preferably, it is 1.3 mm to 1.6 mm; the distance S2 between the retaining pin recess 324 and the right boundary line 326 is greater than or equal to 2.8 mm, and preferably, it is 2.8 mm to 3.1 mm. As described previously, the edge of the retaining pin recess 324 has a chamfered feature structure 3241. In the present embodiment, both the distance SI and the distance S2 may be measured from the outer contour line of the chamfered feature structure 3241. However, due to the small dimensions of the chamfered feature structure 3241, in some embodiments, the distance SI and the distance S2 may also be measured from the inner contour line of the chamfered feature structure.

[0049] In the present embodiment, left and right side edges of the tissue contacting surfaces of the anvil portion 32 are both provided with a transition surface or a chamfered cut surface, and the left boundary line 325 and the right boundary line 326 mentioned in the present embodiment refer to edge lines near the proximal side (i.e., near the center line X, which is seen in FIG. 6) of the transition surface or the chamfered cut surface, on the basis of which the dimensions W 1 , W2, S 1 and S2 are each measured. Since the dimensions of the transition surface or the chamfered cut surface are small, other means of defining the left boundary line and the right boundary line are also possible in other embodiments, and the embodiments in which corresponding dimensions are measured by other defining means also fall within the scope of protection of the present invention.

[0050] The anvil portion 32 has a uniform width throughout the second direction D2, that is, the anvil portion 32 has the same width at its top and bottom (for example, at one end and the other end in the second direction D2).

[0051] Turning back to FIGS. 3-4, a connecting section 33 is provided between the anvil portion 32 and the support part 31, and the anvil portion 32, the support part 31 and the connecting section 33 form a substantially integrated U-shaped member or hook component. In fact, the surgical stapler includes a left workpiece (first side workpiece) and a right workpiece (second side workpiece) clamped together in the third direction D3. The left workpiece forms an integrated left side surface 327 (first side surface) of the anvil portion 32, the connecting section 33, and the support part 31, wherein the left-hand surface 327 is planar. In other words, the side wall of a connecting region 324 of the anvil portion 32 and the connecting section 33, the side wall of the anvil portion 32, and the side wall of the connecting section 33 are in the same plane. This flat configuration also benefits from the left side of the anvil portion 32 being widened, so that the connection position between the connecting section 33 and the anvil portion 32 is projection-free and step-free. In contrast, with reference to FIG. 5, the right workpiece forms an integrated right side surface 328 (second side surface) of the anvil portion 32, the connecting section 33, and the support part 31, and the side wall of the connecting section 33 protrudes from the side wall of the anvil portion 32 so that the connecting position 324 of the connecting section 33 and the anvil portion 32 forms a step portion, and so that the right side surface 328 is not a plane but a surface with a step portion. In other optional embodiments, at a right side face of the anvil portion 32 perpendicular to the third direction D3, a side wall of a connecting region of the anvil portion 32 and the connecting section 33, the side wall of the anvil portion 32, and the side wall of the connecting section 33 may also be in the same plane.

[0052] In the present embodiment, the retaining pin recess 324 is offset to the left side with respect to the center line X, so the left workpiece in the present embodiment forms an integrated left side surface 327 that is planar, and the right workpiece opposite the left workpiece forms an integrated right side surface 328 that is non-planar. In some embodiments, if the retaining pin recess is offset to the right side with respect to the center line, then the right workpiece forms an integrated right side surface that is planar, and the left workpiece opposite the right workpiece forms an integrated left side surface that may be non-planar.

[0053] With reference to FIGS. 3-5, a cap portion 322 is provided on the top of the anvil plate 321, and the cap portion 322 is completely located on the top side of the anvil plate 321, namely, completely located on one side of the anvil plate 321 in the second direction D2. The cap portion 322 has no section extending downward along the side wall of the anvil portion 32. Specifically, the cap portion 322 is actually a part of a support member inside the end effector 30, and the support member includes a support body (not shown) mounted within the anvil portion 32 and the cap portion 322 exposed to the outside. Preferably, the support member is made of plastic, and the anvil plate 321 and a side wall of the anvil portion 32 are made of stainless steel. This arrangement not only ensures the strength of the anvil portion 32, but also reduces the overall weight. FIGS. 8A-8G show the structure of the anvil plate 321 of the anvil portion 32 in detail.

[0054] The cap portion 322 can serve a guide function. In particular, the cap portion 322 has a width that tapers in a direction away from the anvil plate 321, and the dimension of the cap portion 322 in the first direction DI also tapers in the direction away from the anvil plate 321. Preferably, the width of the joint between the cap portion 322 and the anvil plate 321 is consistent with the width of the anvil plate 321.

[0055] The configuration of the anvil portion 32 of the aforementioned embodiment is particularly suitable for a surgical stapler 100 that operates a retaining pin at a distal end. Specifically, a trigger for operably firing a surgical staple is provided on the handle assembly 20, and a retaining pin operating component for operably firing a retaining pin is provided on the end effector 30. Operating the retaining pin distally can easily cause a retaining pin offset, and the widened anvil portion provided by the aforementioned embodiment can compensate for this drawback.

[0056] The surgical stapler provided by the present invention can allow as much as possible for a positional offset generated when firing the retaining pin. For example, even if the retaining pin is not accurately received by the retaining pin recess, the end portion of the retaining pin will abut against the increased tissue contacting surface of the anvil portion without missing the anvil portion and entering tissue. The retaining pin abuts against the increased tissue contacting surface, thereby applying a distally directed counter-pushing force to the anvil. The movement of actuation of the anvil portion and the staple cartridge toward the closed configuration is blocked, or the anvil portion and cartridge cannot be actuated to the closed configuration, which can enable an operator to perceive abnormal actuation of a guide pin. In addition, the retaining pin abutting against the tissue contacting surface of the anvil portion may be returned to the retaining pin recess with subsequent slight shaking or a similar operation, to allow for subsequent surgical procedures.

[0057] The scope of protection of the present invention is defined only by the claims. Reference in the present specification to “various embodiments,” “some embodiments,” “one embodiment,” or “an embodiment,” etc., means that a specific feature, structure, or characteristic described in conjunction with the embodiment s) is included in at least one embodiment. Therefore, the phrases “in various embodiments,” “in some embodiments,” “in one embodiment,” “in an embodiment”, or the like appearing in the present specification are not necessarily all referring to the same embodiment. Furthermore, specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Therefore, specific features, structures, or characteristics shown or described in conjunction with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments, and modifications and variations therefrom also fall within the scope of the present invention, if there is no conflict.

Claims

CLAIMS1. A surgical stapler, comprising a handle assembly (20) for an operator to hold and an end effector (30) located at a distal end of the handle assembly in a first direction (DI), the end effector comprising an anvil portion (32) and a staple cartridge configured to be movable relative to each other in the first direction between an open configuration and a closed configuration, and the anvil portion (32) being formed having an elongated shape extending in a second direction (D2) perpendicular to the first direction (DI), wherein the surgical stapler is configured to enable surgical staples in the staple cartridge to be fired toward the anvil portion (32), and a staple-forming recess (323) for receiving and shaping the surgical staples and a retaining pin recess (324) for receiving a retaining pin provided on the staple cartridge are formed in a tissue contacting surface of the anvil portion (32) facing the staple cartridge; and wherein the staple-forming recess (323) has a center line (X) extending along the second direction (D2), the retaining pin recess (324) is offset to one side with respect to the center line (X), a part of the tissue contacting surface on the one side of the staple-forming recess (323) has a first width (W 1), a part of the tissue contacting surface on the other side of the staple-forming recess (323) has a second width (W2), and the first width (Wl) is greater than the second width (W2).

2. The surgical stapler according to claim 1, wherein the anvil portion (32) comprises an anvil plate (321) which is an integrated member and the surface of which facing the staple cartridge constitutes the tissue contacting surface.

3. The surgical stapler according to claim 1, wherein the first width (W 1) is greater than or equal to 2.5 mm, and the second width (W2) is greater than or equal to 1.5 mm.

4. The surgical stapler according to claim 3, wherein the first width (W 1) is 2.5 mm to 3.0 mm, and the second width (W2) is 1.5 mm to 2 mm.

5. The surgical stapler according to any one of claims 1-4, wherein the one side of the tissue contacting surface has a left boundary line (325) extending in the second direction (D2), and the other side of the tissue contacting surface has a right boundary line (326) extending in the second direction (D2), wherein a distance (SI) between the retaining pin recess (324) and the left boundary line (325) is greater than or equal to 1.3 mm, and a distance between the retaining pin recess (324) and the right boundary line (S2) is greater than or equal to 2.8 mm.

6. The surgical stapler according to claim 5, wherein the distance (SI) between the retaining pin recess (324) and the left boundary line (325) is 1.3 mm to 1.6 mm, and the distance between the retaining pin recess (324) and the right boundary line (S2) is 2.8 mm to 3.1 mm.

7. The surgical stapler according to claim 2, wherein the anvil portion (32) comprises a support member comprising a support body mounted in the anvil portion (32) and a cap portion (322) exposed to the outside, the cap portion (322) is located entirely on one side of the anvil plate (321) in the second direction, and a width of a joint between the cap portion (322) and the anvil plate (321) is consistent with a width of the anvil plate.

8. The surgical stapler according to claim 7, wherein the cap portion (322) has a width that tapers in a direction away from the anvil plate (321), and a dimension of the cap portion (322) in the first direction (DI) also tapers in a direction away from the anvil plate.

9. The surgical stapler according to claim 7 or 8, wherein the support member is made of plastic, and the anvil plate (321) is made of stainless steel.

10. The surgical stapler according to claim 1, wherein the surgical stapler comprises a shaft assembly (24) extending distally from the handle assembly; a support part (31) for mounting the staple cartridge is formed at a distal end of the shaft assembly (24); the surgicalstapler comprises a first side workpiece and a second side workpiece which are clamped together in a third direction (D3); the first side workpiece is on a same side of the retaining pin recess with respect to the center line; a connecting section (33) is provided between the anvil portion (32) and the support part (31); and the first side workpiece forms an integrated first side surface (327) of the anvil portion (32), the connecting section (33) and the support part (31), wherein the integrated first side surface (327) is planar, and the first direction, the second direction and the third direction are orthogonal.

11. The surgical stapler according to claim 10, wherein the second side workpiece forms an integrated second side surface (328) of the anvil portion (32), the connecting section (33) and the support part (31), the second side surface (328) having a step thereon.

12. The surgical stapler according to claim 1, wherein the anvil portion (32) has a uniform width throughout the second direction (D2).

13. The surgical stapler according to claim 1, wherein a trigger (22) for operably firing the surgical staples is provided on the handle assembly (20), and a retaining pin operating component for operably firing the retaining pin is provided on the end effector (30).

14. The surgical stapler according to claim 1, wherein a chamfered feature structure (3241) for guiding the retaining pin into the retaining pin recess (324) is formed on the periphery of the retaining pin recess (324).

15. The surgical stapler according to claim 14, wherein the chamfered feature structure (3241) comprises a continuous annular part surrounding the retaining pin recess.

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