Surgical stapler

Abstract

The utility model provides a surgical stapler, which comprises an anvil part, a part of a tissue contact surface of the anvil part, which is positioned on one side of a nail forming groove, has a first width, a part of the tissue contact surface, which is positioned on the other side of the nail forming groove, has a second width, and the first width is larger than the second width. Such an arrangement allows a certain error to be allowed as much as possible when firing the retaining pin, for example, even if the retaining pin is not accurately received by the retaining pin recess, the end of the retaining pin abuts against an enlarged tissue contact surface of the anvil portion without miss the anvil portion into tissue. The retaining pin abuts against the enlarged tissue contact surface, thereby resisting actuation of the anvil portion and cartridge towards the closed configuration, which enables an operator to perceive anomalies in actuation of the guide pin. In addition, the retaining pin abutting against the tissue contact surface of the anvil portion may return to the retaining pin recess under subsequent slight wobble or similar operations to allow subsequent surgical procedures.

Description

Technical Field

[0001] The utility model relates to the field of surgical instruments, in particular to a surgical stapler / anastomosis device. Background Art

[0002] Surgical staplers / staplers are commonly used to deploy nails into tissues to reduce or eliminate tissue bleeding, for example, when tissues are cut, it is necessary to sew up the tissues to promote healing. Surgical staplers / staplers (such as linear staplers / staplers, arc-shaped staplers / staplers) may include an end effector assembly having a staple cartridge and a staple anvil portion, the end effector assembly being capable of fixing the tissue between the staple cartridge and the anvil, wherein the staple cartridge includes a staple cartridge configured to be able to removably store surgical staples therein, and the anvil includes a staple groove for forming the staples. Such surgical staplers / staplers typically include a closure system that moves one of the staple cartridge and the anvil relative to the other.

[0003] As described above, the surgical stapler / stapler can be configured to close the nail magazine and anvil of the end effector assembly to form a closed configuration so that tissue is captured between the nail magazine and the anvil. In the closed configuration, the nail magazine and the anvil apply a clamping force to the tissue so that the tissue is kept between the anvil and the nail magazine. Then, the nail is driven to deform from the nail magazine and against the nail groove of the anvil, thereby fixing the tissue layers together. The nail is usually deployed with a number of nail lines or nail rows so that the tissue layers are more reliably fixed together. The end effector assembly may not include a cutting member or include a cutting member that can be advanced between the nail rows to cut the tissue after the tissue layers have been sutured together.

[0004] like Figure 1 The figure shows an existing end effector 16. The 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 be able to laterally receive or "reload" tissue within a gap defined between a cartridge housing 162 of a staple cartridge 160 mounted within the end effector 16 and an anvil 210. The end effector 16 also includes a retaining pin 176 that can extend distally from the staple cartridge 160 in the direction of the arrow in the figure for capturing tissue between the anvil 210 and the cartridge housing 162. The retaining pin may be, for example, Figure 1 As shown, the handle end of the surgical stapler is pushed, or the end actuator is pushed by the user, so that the retaining pin is received by the corresponding position of the anvil. However, the retaining pin is easy to deviate from the predetermined target. Once the retaining pin deviates, it will miss the anvil and hit the tissue around the anvil, which will not only fail to achieve the subsequent surgical purpose, but also may cause damage to the tissue.

[0005] Therefore, it is necessary to provide a surgical stapler to at least partially solve the above problems. Utility Model Content

[0006] The utility model provides a surgical stapler, which has a widened anvil portion. Specifically, a retaining pin groove is arranged on the anvil portion to be biased to one side, and the anvil portion is expanded outward as a whole on this side, so as to obtain a larger width. Such an arrangement allows a certain error to be allowed as much as possible when firing the retaining pin, for example, even if the retaining pin is not accurately received by the retaining pin groove, the end of the retaining pin will also abut against the increased tissue contact surface of the anvil portion, and will not miss the anvil portion and enter the tissue. The retaining pin abuts against the increased tissue contact surface to apply a resisting driving force toward the far side to the anvil, and the movement of the anvil portion and the staple cartridge toward the closed configuration actuation is blocked, or the anvil portion and the staple cartridge cannot be actuated to the closed configuration, which can enable the operator to perceive the abnormality of the guide pin actuation. In addition, the retaining pin abutting against the tissue contact surface of the anvil portion can return to the retaining pin groove under subsequent slight shaking or similar operations to allow subsequent surgical operations.

[0007] According to one aspect of the utility model, a surgical stapler is provided, the surgical stapler comprising a handle assembly for an operator to hold and an end actuator located at the distal end of the handle assembly in a first direction, the end actuator comprising an anvil portion and a staple cartridge, the anvil portion and the staple cartridge being configured to be able to move relative to each other along the first direction between an open configuration and a closed configuration, the anvil portion being formed into a long strip extending along a second direction perpendicular to the first direction,

[0008] The surgical stapler is configured to fire the surgical staples in the staple magazine toward the anvil portion, and a staple groove for receiving and shaping the surgical staples and a retaining pin groove for receiving a retaining pin provided on the staple magazine are formed in the tissue contact surface of the anvil portion facing the staple magazine.

[0009] In which, the nail forming groove has a center line extending along the second direction, the retaining pin groove deviates to one side relative to the center line, and the portion of the tissue contact surface located on the one side of the nail forming groove has a first width, and the portion of the tissue contact surface located on the other side of the nail forming groove has a second width, and the first width is greater than the second width.

[0010] In one embodiment, the anvil portion includes an anvil plate that is a one-piece component and a surface of the anvil plate that faces the staple cartridge constitutes the tissue contact surface.

[0011] In one 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.

[0012] In one embodiment, the first width is 2.5 mm-3.0 mm, and the second width is 1.5 mm-2 mm.

[0013] In one embodiment, one side of the tissue contact surface has a left boundary line extending along the second direction, and the other side of the tissue contact surface has a right boundary line extending along the second direction, wherein the distance between the retaining pin groove and the left boundary line is greater than or equal to 1.3 mm, and the distance between the retaining pin groove and the right boundary line is greater than or equal to 2.8 mm.

[0014] In one embodiment, the distance between the retaining pin groove and the left boundary line is 1.3 mm-1.6 mm, and the distance between the retaining pin groove and the right boundary line is 2.8 mm-3.1 mm.

[0015] In one embodiment, the anvil portion includes a support member, which includes a support body installed in the anvil portion and a cap portion exposed to the outside, the cap portion is completely located on one side of the anvil board in the second direction, and the width of the cap portion at the joint with the anvil board is consistent with the width of the anvil board.

[0016] In one embodiment, the cap portion has a width that tapers in a direction away from the anvil, and a dimension of the cap portion in the first direction also tapers in a direction away from the anvil.

[0017] In one embodiment, the support member is an elongated support structure made of plastic, and the cutting board is a plate-like structure made of stainless steel.

[0018] In one embodiment, the surgical stapler includes an axis assembly extending distally from the handle assembly, the distal end of the axis assembly is formed with a support portion for mounting the staple magazine, the surgical stapler includes a first side workpiece and a second side workpiece clamped together in a third direction, the first side workpiece is located on the same side of the retaining pin groove relative to the center line, a connecting section is provided between the anvil portion and the support portion, and the first side workpiece forms an integral first side surface of the anvil portion, the connecting section, and the support portion, wherein the integral first side surface is a plane, and the first direction, the second direction, and the third direction are orthogonal.

[0019] In one embodiment, the second side workpiece forms an integral second side surface of the anvil portion, the connecting section, and the supporting portion, and a step is provided on the second side surface.

[0020] In one embodiment, the anvil portion has a uniform width everywhere in the second direction.

[0021] In one embodiment, a trigger for operably firing the surgical staple is disposed on the handle assembly, and a retaining pin operating component for operably firing the retaining pin is disposed on the end effector.

[0022] In one embodiment, a chamfered feature structure for guiding the retaining pin into the retaining pin groove is formed around the retaining pin groove.

[0023] In one embodiment, the chamfer feature includes a continuous annular portion surrounding the retaining pin groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention and its features and advantages will be better understood by referring to the following description of the exemplary embodiments of the present invention in conjunction with the accompanying drawings. In the following description and drawings, similar parts are marked with similar numbers. The drawings are not necessarily drawn to scale, and for the sake of clarity and brevity, some parts may be omitted, and some drawings may be drawn in an exaggerated or schematic manner.

[0025] Figure 1 An end effector of a conventional surgical stapler is shown;

[0026] Figure 2 A three-dimensional view of a surgical stapler according to an embodiment of the present invention is exemplarily shown;

[0027] Figure 3 for Figure 2 An enlarged view of the end effector portion in FIG.

[0028] Figure 4 for Figure 3 A front view of an end effector;

[0029] Figure 5 for Figure 3 another side view of the end effector;

[0030] Figure 6 for Figure 2-Figure 5 A side view of an anvil portion of an end effector;

[0031] Figure 7 for Figure 6 A partial enlarged view of

[0032] Fig. 8A for Figure 6 A separate stereogram of a cutting board in FIG.

[0033] Figure 8B-8G for Figure 6 Six views of the cutting board in Figure 8B This is the front view of the cutting board. Figure 8C This is the back view of the cutting board. Fig.8D This is the left side view of the cutting board. Fig. 8E This is the right side view of the cutting board. Figure 8F A top view of a cutting board. Figure 8G This is a bottom view of the cutting board. DETAILED DESCRIPTION

[0034] Below, the exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. What is described here is only an exemplary embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the exemplary embodiments, and the other ways also fall within the scope of the present invention.

[0035] Figure 2-Figure 8G The following is an exemplary diagram of a surgical stapler according to an embodiment of the present invention. First of all, it should be noted that the terms of direction and position involved in the present invention should be understood as relative directions and relative positions, and should not be understood as absolute directions and absolute positions. Figure 2-Figure 7 The "first direction D1", "second direction D2" and "third direction D3" mentioned in the present invention are three directions orthogonal in space. Figure 1 In the orientation of the surgical stapler shown, the "first direction D1" and the "third direction D3" are generally horizontal directions, the "second direction D2" is generally understood to be a vertical direction, and the "first direction D1" can be understood to be the direction of the distal direction (referring to the direction away from the operator) and the proximal direction (referring to the direction close to the operator). Unless otherwise specified, the "width" mentioned in the present invention refers to the size of the component in the third direction D3.

[0036] First reference Figure 2 , an exemplary right-angle linear surgical stapler configured to be capable of suturing and cutting tissue in various non-endoscopic ("open") surgical procedures, including, for example, colorectal, thoracic, and bariatric surgery, is shown. 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 the distal end of the shaft assembly 24. The end effector 30 is provided with a "right-angle" configuration so that the end effector 30 clamps, suturing, and cutting tissue in a plane extending transversely at right angles to the longitudinal axis defined by the shaft assembly.

[0037] The handle assembly 20 includes a housing 21 defining a pistol grip 23, a pair of pivotable triggers 22, which may include a closing trigger and a firing trigger. The closing 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 close and thereby clamp tissue in response to actuation of the closing trigger, and then staple and cut tissue in response to actuation of the firing trigger.

[0038] The end effector 30 includes an anvil portion 32 and a staple cartridge. Figure 2-Figure 8G Not shown, but can be referenced Figure 1 1 and 2. The general structure and position of the nail magazine 160 of the end actuator 16 shown in FIG. A support portion 31 for mounting the nail magazine is provided at the distal end of the shaft assembly 24. The anvil portion 32 and the nail magazine are configured to be movable relative to each other along a first direction D1 between an open configuration and a closed configuration, and the anvil portion 32 is formed in an elongated strip shape extending along a second direction D2 perpendicular to the first direction D1.

[0039] 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 closing system, and a firing system. The retaining pin actuation system is operable to push the retaining pin distally to achieve initial retention of tissue within the end effector 30. The retaining pin in this embodiment is Figure 2-Figure 8G Not shown, but can be referenced Figure 1 The general structure and position of the retaining pin 176 of the end effector 16 shown in . The closing system is operable to clamp tissue with the end effector 30; the firing system is operable to subsequently suturing and cutting tissue with the end effector 30. Although the teachings of the present invention are shown and described in the context of a "linear" surgical stapler 100 configured to apply linear rows of staples and linear cut 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 apply rows of staples and tissue cut lines having non-linear (e.g., curved) configurations, such as surgical staplers of the type disclosed in any one or more of the references incorporated by reference into the present invention.

[0040] refer to Figure 3-Figure 5The end effector is configured to be able to fire the surgical nail toward the anvil portion 32 under the action of the firing system. The anvil portion 32 is formed with a nailing groove 323 for receiving and forming the surgical nail and a retaining pin groove 324 for receiving the retaining pin in the tissue contact surface facing the nail magazine, i.e., facing the proximal side. The nailing groove 323 has a center line X extending along the second direction D2. In this embodiment, the nailing groove 323 is in two rows, namely, a first row of nailing grooves 3231 and a second row of nailing grooves 3232. Each row of nailing grooves 323 extends along the second direction D2. The two rows of nailing grooves 323 are arranged side by side in the third direction D3. Then, the center line X of this embodiment is located between the two rows of nailing grooves 323. In other embodiments, more rows of nailing grooves 323 may be provided, and the center line X is located at the exact center of all rows of nailing grooves 323 along the third direction D3.

[0041] refer to Figure 6-Figure 7 , the retaining pin groove 324 deviates to one side relative to the center line X. Figure 6-Figure 7 From the perspective of , the retaining pin groove 324 is located on the left side half of the tissue contact surface. In order to allow the anvil portion 32 to abut against the end of the retaining pin when the retaining pin is fired and the retaining pin is not accurately received by the retaining pin groove 324, the left side half of the anvil portion 32 is expanded to the left as a whole. In other words, the portion of the tissue contact surface located on the left side of the staple groove 323 has a first width W1 (the first width W1 is the minimum distance between the staple groove 323 and the left boundary line 325 of the tissue contact surface), and the portion of the tissue contact surface located on the right side of the staple groove 323 has a second width W2 (the second width W2 is the minimum distance between the staple groove 323 and the right boundary line 326 of the tissue contact surface), and the first width W1 is greater than the second width W2.

[0042] In particular, in some embodiments, the first width W1 is greater than or equal to 2.5 mm, preferably 2.5 mm-3.0 mm; the second width W2 is greater than or equal to 1.5 mm, preferably 1.5 mm-2 mm. It should be noted that the edge of the nail forming groove 232 may have a chamfer, and in this embodiment, the measurement of the first width W1 and the second width W2 may both start from the outer contour line of the chamfer of the nail forming groove 232. However, due to the small size of the chamfer, in some embodiments, the measurement of the first width and the second width may also start from the inner contour line of the chamfer of the nail forming groove.

[0043] Continue to refer Figure 7Preferably, a chamfered feature structure 3241 for guiding the retaining pin into the retaining pin groove 324 is formed on the outer periphery of the retaining pin groove 324. The chamfered feature structure 3241 may be, for example, a continuous ring around the retaining pin groove 324, so that when the end of the retaining pin abuts against any position around the retaining pin groove 324, it can be guided by the chamfered feature structure 3241 and enter the retaining pin groove 324. In other embodiments not shown, 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 groove.

[0044] In this embodiment, the anvil portion 32 includes an integrated anvil plate 321 (the anvil plate may also be referred to as an anvil), the tissue contact surface of the anvil portion 32 is completely formed on the anvil plate 321, and the staple groove 323 and the retaining pin groove 324 are both formed on the anvil plate 321. In order to achieve the widening of the left side of the anvil portion 32, the anvil plate 321 actually has a larger width, especially the area on the left side of the staple groove 323 has a larger width.

[0045] The left half area of ​​the tissue contact surface where the retaining pin groove 324 is located is widened, so that the distance between the retaining pin groove 324 and the left boundary line of the tissue contact surface is also increased, but due to the eccentric setting of the retaining pin groove 324, the distance between the retaining pin groove 324 and the left boundary line may still be smaller than the distance between the retaining pin groove 324 and the right boundary line. For example, the distance S1 between the retaining pin groove 324 and the left boundary line 325 is greater than or equal to 1.3mm, preferably 1.3mm-1.6mm; the distance S2 between the retaining pin groove 324 and the right boundary line 326 is greater than or equal to 2.8mm, preferably 2.8mm-3.1mm. As described above, the edge of the retaining pin groove 324 has a chamfered feature structure 3241. In this embodiment, the measurement of the distance S1 and the distance S2 can both start from the outer contour line of the chamfered feature structure 3241. However, due to the small size of the chamfered feature structure 3241, in some embodiments, the measurement of the distance S1 and the distance S2 can also start from the inner contour line of the chamfered feature structure.

[0046] In this embodiment, the left and right edges of the tissue contact surface of the anvil portion 32 are both provided with transition surfaces or chamfered cut surfaces. The left boundary line 325 and the right boundary line 326 mentioned in this embodiment refer to the proximal side of the transition surface or the chamfered cut surface (i.e., close to the center line X, the center line X is shown in FIG. Figure 6 ) edge line, and the measurements of dimensions W1, W2, S1, and S2 are all performed on this basis. Since the dimensions of the transition surface or chamfered cut surface are relatively small, other definitions of the left boundary line and the right boundary line may also be used in other embodiments, and the implementation methods of obtaining corresponding dimensions by measurement under other definition methods also fall within the protection scope of the present utility model.

[0047] The anvil portion 32 has a uniform width everywhere in the second direction D2 , that is, the anvil portion 32 has the same width at the top and bottom thereof (eg, at one end and the other end in the second direction D2 ).

[0048] Transfer back Figure 3-Figure 4 , a connecting section 33 is provided between the anvil portion 32 and the support portion 31, and the anvil portion 32, the support portion 31 and the connecting section 33 form a roughly integrated U-shaped member or hook-shaped component. In fact, the surgical stapler includes a left workpiece (first side workpiece) and a right workpiece (second side workpiece) clamped together in a third direction D3, and 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 portion 31, wherein the left side surface 327 is a plane, in other words, the side walls of the connection area 324 of the anvil portion 32 and the connecting section 33, the side walls of the anvil portion 32, and the side walls of the connecting section 33 are in the same plane. This flat configuration also benefits from the widening of the left side of the anvil portion 32, so that the connection position between the connecting section 33 and the anvil portion 32 has no protrusions or steps. For comparison, refer to Figure 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 portion 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, so that the right side surface 328 is not a plane but a surface with a step portion. In other optional embodiments, at the right side surface of the anvil portion 32 perpendicular to the third direction D3, the side wall of the connection area 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 can also be in the same plane.

[0049] In this embodiment, the retaining pin groove 324 is biased to the left relative to the center line X, so the left side surface 327 formed by the left workpiece in this embodiment is a plane, and the right side surface 328 formed by the right workpiece opposite to the left workpiece is a non-plane. In some embodiments, the retaining pin groove may be biased to the right relative to the center line, so the right side surface formed by the right workpiece is a plane, and the left side surface formed by the left workpiece opposite thereto may be a non-plane.

[0050] refer to Figure 3-Figure 5, a cap portion 322 is provided on the top of the anvil 321, and the cap portion 322 is completely located on the top side of the anvil 321, that is, completely located on one side of the anvil 321 in the second direction D2, and the cap portion 322 does not have a section extending downward along the side wall of the anvil portion 32. Specifically, the cap portion 322 is actually a part of the support member inside the end actuator 30, and the support member includes a support body (not shown in the figure) installed in the anvil portion 32 and the cap portion 322 exposed to the outside. Preferably, the support member is an elongated support structure made of plastic, and the anvil 321 and the side wall of the anvil portion 32 and other components are made of stainless steel. Such a configuration not only ensures the strength of the anvil portion 32, but also reduces the overall weight. Figure 8A-8G The structure of the anvil plate 321 of the anvil portion 32 is shown in detail.

[0051] The cap 322 can play a guiding role. Specifically, the cap 322 has a width that tapers away from the anvil 321, and the size of the cap 322 in the first direction D1 also tapers away from the anvil 321. Preferably, the width of the cap 322 at the joint with the anvil 321 is consistent with the width of the anvil 321.

[0052] The anvil portion 32 configuration of the above embodiment is particularly suitable for a surgical stapler 100 that operates a retaining pin at the 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 actuator 30. Operating the retaining pin at the distal end is prone to retaining pin deviation, and the widened anvil portion 32 provided in the above embodiment can compensate for this defect.

[0053] The surgical stapler provided by the utility model can allow the positional deviation generated when firing the retaining pin as much as possible, for example, even if the retaining pin is not accurately received by the retaining pin groove, the end of the retaining pin will abut against the increased tissue contact surface of the anvil portion, and will not miss the anvil portion and enter the tissue. The retaining pin abuts against the increased tissue contact surface, thereby applying a resisting driving force toward the far side to the anvil, and the movement of the anvil portion and the staple cartridge toward the closed configuration actuation is blocked, or the anvil portion and the staple cartridge cannot be actuated to the closed configuration, which can enable the operator to perceive the abnormality of the guide pin actuation. In addition, the retaining pin abutting against the tissue contact surface of the anvil portion can return to the retaining pin groove under subsequent slight shaking or similar operations to allow subsequent surgical operations.

[0054] The scope of protection of the present utility model is limited only by the claims. The "various embodiments", "some embodiments", "one embodiment" or "embodiment" mentioned in this specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment. Therefore, the phrases "in various embodiments", "in some embodiments", "in one embodiment" or "in an embodiment" appearing in this specification do not necessarily refer to the same embodiment. In addition, in one or more embodiments, specific features, structures or characteristics may be combined in any suitable manner. Therefore, in the absence of conflict, the specific features, structures or characteristics shown or described in conjunction with one embodiment may be combined in whole or in part with the features, structures or characteristics of one or more other embodiments, and the resulting modifications and variations also fall within the scope of the present utility model.

Claims

1. A surgical stapler, characterized in that: The surgical stapler comprises a handle assembly (20) for an operator to hold and an end actuator (30) located at the distal end of the handle assembly in a first direction (D1), the end actuator (30) comprising an anvil portion (32) and a staple cartridge, the anvil portion (32) and the staple cartridge being configured to be movable relative to each other along the first direction between an open configuration and a closed configuration, the anvil portion (32) being formed into a long strip extending along a second direction (D2) perpendicular to the first direction (D1), The surgical stapler is configured to fire the surgical staples in the staple cartridge toward the anvil portion (32), and a staple groove (323) for receiving and shaping the surgical staples and a retaining pin groove (324) for receiving a retaining pin provided on the staple cartridge are formed in the tissue contact surface of the anvil portion (32) facing the staple cartridge. In which, the nail forming groove (323) has a center line (X) extending along the second direction (D2), the retaining pin groove (324) deviates to one side relative to the center line (X), and the portion of the tissue contact surface located on the one side of the nail forming groove (323) has a first width (W1), and the portion of the tissue contact surface located on the other side of the nail forming groove (323) has a second width (W2), and the first width (W1) is greater than the second width (W2).

2. The surgical stapler according to claim 1, characterized in that: The anvil portion (32) includes an anvil plate (321), which is an integral component and a surface of the anvil plate facing the staple cartridge constitutes the tissue contact surface.

3. The surgical stapler according to claim 1, characterized in that: The first width (W1) 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, characterized in that: The first width (W1) is 2.5 mm-3.0 mm, and the second width (W2) is 1.5 mm-2 mm.

5. The surgical stapler according to any one of claims 1 to 4, characterized in that: The one side of the tissue contact surface has a left boundary line (325) extending along the second direction (D2), and the other side of the tissue contact surface has a right boundary line (326) extending along the second direction (D2), wherein the distance (S1) between the retaining pin groove (324) and the left boundary line (325) is greater than or equal to 1.3 mm, and the distance (S2) between the retaining pin groove (324) and the right boundary line (326) is greater than or equal to 2.8 mm.

6. The surgical stapler according to claim 5, characterized in that: The distance (S1) between the retaining pin groove (324) and the left boundary line (325) is 1.3 mm to 1.6 mm, and the distance (S2) between the retaining pin groove (324) and the right boundary line (326) is 2.8 mm to 3.1 mm.

7. The surgical stapler according to claim 2, characterized in that: The anvil portion (32) includes a support member, which includes a support body installed in the anvil portion (32) and a cap portion (322) exposed to the outside, and the cap portion (322) is completely located on one side of the anvil board (321) in the second direction, and the width of the cap portion (322) at the joint with the anvil board (321) is consistent with the width of the anvil board.

8. The surgical stapler according to claim 7, characterized in that: The cap portion (322) has a width that tapers in a direction away from the anvil board (321), and a dimension of the cap portion (322) in the first direction (D1) also tapers in a direction away from the anvil board.

9. The surgical stapler according to claim 7 or 8, characterized in that: The support member is an elongated support structure made of plastic, and the cutting board (321) is a plate-like structure made of stainless steel.

10. The surgical stapler according to claim 1, characterized in that: The surgical stapler includes an axis assembly (24) extending distally from the handle assembly, and a support portion (31) for mounting the staple magazine is formed at the distal end of the axis assembly (24). The surgical stapler includes a first side workpiece and a second side workpiece clamped together in a third direction (D3), the first side workpiece being located on the same side of the retaining pin groove relative to the center line, a connecting section (33) being provided between the anvil portion (32) and the support portion (31), and the first side workpiece forming an integral first side surface (327) of the anvil portion (32), the connecting section (33), and the support portion (31), wherein the integral first side surface (327) is a plane, and the first direction, the second direction, and the third direction are orthogonal.

11. The surgical stapler according to claim 10, characterized in that: The second side workpiece forms an integral second side surface (328) of the anvil portion (32), the connecting section (33) and the supporting portion (31), and the second side surface (328) has a step.

12. The surgical stapler according to claim 1, characterized in that: The anvil portion (32) has a uniform width at all locations in the second direction (D2).

13. The surgical stapler according to claim 1, characterized in that: A trigger (22) for operably firing the surgical nail is disposed on the handle assembly (20), and a retaining pin operating component for operably firing the retaining pin is disposed on the end actuator (30).

14. The surgical stapler according to claim 1, characterized in that: A chamfered feature structure (3241) is formed around the retaining pin groove (324) for guiding the retaining pin into the retaining pin groove (324).

15. The surgical stapler according to claim 14, characterized in that: The chamfer feature (3241) comprises a continuous annular portion surrounding the retaining pin groove.

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