Staple cartridge assembly, jaw assembly, and surgical stapler

Abstract

The application provides a staple cartridge assembly, a jaw assembly and a surgical stapler. The staple cartridge assembly comprises: a staple strip comprising a staple strip body and a plurality of staples, the staple comprising a staple connecting portion and a staple leg, the staple connecting portion being rotatably mounted to the staple strip body; a cartridge cover arranged outside the staple strip, the cartridge cover being provided with a plurality of staple holes, the staple hole comprising a distal end region and a proximal end region, the staple leg of the staple passing through the distal end region of the staple hole when the stapler is fired; wherein the transverse opening size of the distal end region of the staple hole is greater than that of the proximal end region. By using the application, the distal end region of the staple hole has a greater transverse opening size than the proximal end region, which can ensure that the staple leg of the staple smoothly passes out of the staple hole when the stapler is fired.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to a staple cartridge assembly, a jaw assembly, and a surgical stapler. Background Technology

[0002] Surgical staplers generally consist of an instrument platform and a jaw assembly, which is mounted at the distal end of the instrument platform. The jaw assembly includes a staple cartridge assembly and an anvil positioned opposite each other, forming an openable and closable jaw between the staple cartridge assembly and the anvil. Figures 1-7 The diagram illustrates the structure of a staple cartridge assembly and its included staple cartridge cover in the prior art. (Example) Figures 1-7 As shown, the staple cartridge assembly 900 includes a plurality of staples 903 and a staple cartridge cover 901, with a firing block 904 located at the proximal end of the staple cartridge assembly 900. In the initial state, the staples 903 are located inside the staple cartridge cover 901. One end of each staple 903 is rotatably connected to a staple band body inside the staple cartridge cover 901. The staple cartridge cover 901 includes an upper plate 9011 and at least one side plate 9012. The upper plate 9011 of the staple cartridge cover 901 has a plurality of staple holes 9013. When the stapler fires, the jaws close and clamp the tissue, the firing block 904 moves distally, driving the staples 903 to rotate relative to the staple band body. The staple feet 9031 of the staples 903 protrude outward from the staple holes 9013, piercing the tissue, and then close under the action of the anvil to suture onto the tissue. However, during use, the staple 903 may shift laterally or longitudinally within the staple hole 9013 during rotation, causing the staple 9031 to interfere with the side wall of the staple hole 9013, thus preventing the staple 903 from passing through the staple hole 9013 smoothly and affecting the suturing effect. Utility Model Content

[0003] To address the problems in the prior art, the purpose of this application is to provide a staple cartridge assembly, a jaw assembly, and a surgical stapler that ensures the staple feet smoothly pass through the staple holes when the stapler is fired.

[0004] A first aspect of this application provides a stapler assembly for a surgical stapler, the stapler assembly comprising:

[0005] The staple tape includes a staple tape body and a plurality of staples, each staple including a staple connector and a staple foot, the staple connector being rotatably mounted on the staple tape body;

[0006] The staple cartridge cover is located outside the staple belt. The staple cartridge cover has multiple staple holes, including a distal region and a proximal region. When the stapler is fired, the staple foot passes through the distal region of the staple hole. The lateral opening size of the distal region of the staple hole is larger than that of the proximal region.

[0007] In some embodiments, the distal region of the nail hole includes a first sidewall and a second sidewall disposed opposite to each other, and the proximal region of the nail hole includes a third sidewall and a fourth sidewall disposed opposite to each other, wherein the proximal end of the first sidewall is connected to the distal end of the third sidewall, and the proximal end of the second sidewall is connected to the distal end of the fourth sidewall.

[0008] Wherein, the first sidewall of the distal region protrudes outward toward the outside of the nail hole relative to the third sidewall of the proximal region, and / or, the second sidewall of the distal region protrudes outward toward the outside of the nail hole relative to the fourth sidewall of the proximal region.

[0009] In some embodiments, the first sidewall of the distal region is formed as an arcuate surface protruding outward from the nail hole, and / or the second sidewall of the distal region is formed as an arcuate surface protruding outward from the nail hole.

[0010] In some embodiments, the surfaces of the first and third sidewalls of the nail hole are continuous inclined surfaces, and / or the surfaces of the second and fourth sidewalls of the nail hole are continuous inclined surfaces.

[0011] In some embodiments, there is a smooth transition between the proximal end of the first sidewall of the nail hole and the distal end of the third sidewall, and a smooth transition between the proximal end of the second sidewall of the nail hole and the distal end of the fourth sidewall.

[0012] In some embodiments, the staple cartridge cover includes a top plate and at least one side plate, the distal region of the staple hole includes a first segment and a second segment that are connected, and the proximal region of the staple hole includes a third segment and a fourth segment that are connected, the first segment and the third segment being disposed on the top plate, and the second segment and the fourth segment being disposed on the side plate.

[0013] The lateral opening size of the distal region is equal to the sum of the lateral opening width of the first segment and the longitudinal opening height of the second segment, while the lateral opening size of the proximal region is equal to the sum of the lateral opening width of the third segment and the longitudinal opening height of the fourth segment.

[0014] In some embodiments, the lateral opening width of the first segment is greater than the lateral opening width of the third segment, and / or the longitudinal opening height of the second segment is greater than the longitudinal opening height of the fourth segment.

[0015] In some embodiments, the first segment has a first sidewall on the side away from the second segment, and the second segment has a second sidewall on the side away from the first segment. The first sidewall is parallel to the side plate, and the second sidewall is parallel to the top plate.

[0016] In some embodiments, the staple cartridge cover includes a top plate, staple holes are formed in the top plate, the lateral opening size of the distal region is equal to the lateral width of the distal region, and the lateral opening size of the proximal region is equal to the lateral width of the proximal region.

[0017] A second aspect of this application provides a jaw assembly, including an anvil and a staple cartridge assembly as described in the first aspect.

[0018] In some embodiments, the anvil is provided with a plurality of nail forming grooves on the side facing the nail cartridge assembly. The nail forming groove includes a distal portion and a proximal portion, and the groove width of the distal portion of the nail forming groove is greater than the groove width of the proximal portion of the nail forming groove.

[0019] A third aspect of this application provides a surgical stapler, including a staple cartridge assembly of the first aspect or a jaw assembly of the second aspect.

[0020] The staple cartridge assembly, jaw assembly, and surgical stapler provided in this application have the following beneficial effects:

[0021] By adopting the staple cartridge assembly of this application, the distal region of the staple hole has a larger lateral opening size than the proximal region. When the stapler is fired, the staple foot protrudes outward from the distal region with a larger lateral opening size. Even if the staple foot is slightly offset, it is not easy to interfere with the side wall of the staple hole, reducing the risk of the staple foot getting stuck in the staple hole and being unable to pass out smoothly, thus effectively improving the suturing effect. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0023] Figure 1 This is a 3D view of a staple cartridge component in the prior art;

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 This is a top view of a staple cartridge assembly in the prior art;

[0026] Figure 4 yes Figure 3 Enlarged view at point B in the middle;

[0027] Figure 5 This is a three-dimensional view of a staple cartridge cover in the prior art;

[0028] Figure 6 yes Figure 5 Enlarged view at point C;

[0029] Figure 7 This is a partial top view of a staple cartridge cover in the prior art;

[0030] Figure 8 This is a perspective view of a staple cartridge assembly according to an embodiment of this application;

[0031] Figure 9 yes Figure 8 Enlarged view at point D;

[0032] Figure 10 yes Figure 8 Enlarged view at point E in the middle;

[0033] Figure 11 This is a top view of a staple cartridge assembly according to an embodiment of this application;

[0034] Figure 12 yes Figure 11 Enlarged view at point F;

[0035] Figure 13 This is a perspective view of a nail cartridge cover according to an embodiment of this application;

[0036] Figure 14 yes Figure 13 Enlarged view at point G;

[0037] Figure 15 This is a top view of a staple cartridge cover according to an embodiment of this application;

[0038] Figure 16 yes Figure 15 Enlarged view at point H;

[0039] Figure 17 A partial top view of the staple cartridge cover according to another embodiment of this application is shown.

[0040] Figure label:

[0041] Existing technology:

[0042] 900-Stabbing cartridge assembly; 901-Stabbing cartridge cover; 9011-Top plate; 9012-Side plate; 9013-Stabbing hole; 903-Matching staple; 9031-Stabbing foot; 904-Firing block.

[0043] This application:

[0044] 10-Stabbing cartridge assembly; 1-Stabbing cartridge cover; 11-Top plate; 12-Side plate; 13-Stabbing hole; 13a-Distal region; 13b-Proximal region; 131-First side wall; 1311-Protruding part; 132-Second side wall; 133-Third side wall; 134-Fourth side wall; 14-Bending part; 15-Base plate; 2-Stabbing tape body; 3-Matching staple; 31-Stabbing foot; 4-Firing block; 5-Cutting groove. Detailed Implementation

[0045] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Although the terms “upper,” “lower,” “between,” etc., may be used in this specification to describe different exemplary features and elements of this application, these terms are used herein only for convenience, such as the orientation of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of this application. Although “first” or “second,” etc., are used in this specification to denote certain features, they are merely indicative of function and not as a limitation on the number or importance of specific features.

[0046] This application provides a stapler cartridge assembly for a surgical stapler, a jaw assembly including the stapler cartridge assembly, and a surgical stapler. The surgical stapler includes an instrument platform and a jaw assembly, the jaw assembly being mounted distally to the instrument platform. The jaw assembly includes a stapler cartridge assembly and an anvil disposed opposite each other, forming an openable and closable jaw between the stapler cartridge assembly and the anvil. The stapler cartridge assembly contains a plurality of staples; when the stapler is fired, the jaw closes to clamp the tissue, and then the staples are driven through the staple holes of the stapler cartridge assembly and sutured to the tissue.

[0047] Figures 8-12 The structure of a staple cartridge assembly 10 according to an embodiment of this application is shown. Figures 8-12 As shown, in this embodiment, the staple cartridge assembly 10 includes: a staple band, comprising a staple band body 2 and a plurality of matching staples 3, each matching staple 3 including a staple connecting portion and a staple foot 31, the staple connecting portion being rotatably mounted to the staple band body 2; and a staple cartridge cover 1, disposed outside the staple band, the staple cartridge cover 1 having a plurality of staple holes 13, each staple hole 13 including a distal region 13a and a proximal region 13b. A firing block 4 is provided at the proximal end of the staple cartridge assembly 10. In this embodiment, the mating structure of the staple cartridge cover 1 and the staple band can be found in the corresponding structure in patent application CN115721354A.

[0048] Initially, the staple 3 is located inside the corresponding staple hole 13, and the highest point of the staple foot 31 is lower than the highest point of the staple hole 13, thus avoiding contact with the tissue. When the stapler is fired, the firing block 4 is driven distally, causing the staple 3 to rotate relative to the staple body 2, and the staple foot 31 passes through the distal region 13a of the staple hole 13. During surgery, the tissue to be anastomosed is placed between the jaws of the stapler. After the jaws close, the stapler is fired. During this process, the tissue is squeezed while being gripped by the jaws, and the reaction force of the tissue causes the staple foot 31 to encounter resistance and lateral sway when it exits the staple hole 13. This resistance is even greater when facing thick or hard tissue. The swayed staple foot 31 will press against the staple cartridge cover 901, preventing the staple from rotating further and exiting the staple hole 13, resulting in poor anastomosis. In this design, the lateral opening size of the distal region 13a of the staple hole 13 is larger than that of the proximal region 13b. When the stapler is fired, the staple foot 31 extends outward from the distal region 13a, which has a larger lateral opening size. Even if the staple foot 31 has a certain offset, it is not easy to interfere with the side wall of the staple hole 13, reducing the risk that the staple foot 31 will get stuck in the staple hole 13 and cannot pass out smoothly, thus effectively improving the suturing effect.

[0049] In this application, "distal" and "proximal" are relative to the operator; for example, "distal" refers to the end relatively far from the operator, and "proximal" refers to the end relatively close to the operator. Figure 11 From this perspective, the left end of the staple cartridge assembly 10 is the distal end, and the right end is the proximal end. "Axial axis" refers to the direction of extension of the staple cartridge assembly 10, such as... Figure 11 In the D1 direction.

[0050] In this embodiment, the staple cartridge cover 1 includes an upper plate 11 and at least one side plate 12, with a bend 14 formed between the upper plate 11 and the side plate 12. The distal region 13a of the staple hole 13 includes a first segment and a second segment that are connected, and the proximal region 13b of the staple hole 13 includes a third segment and a fourth segment that are connected. The first and third segments are located on the upper plate 11, and the second and fourth segments are located on the side plate 12. The first and third segments are transverse openings on the upper plate 11, and the proximal end of the first segment is connected to the distal end of the third segment. The second and fourth segments are longitudinal openings on the side plate 12, and the proximal end of the second segment is connected to the distal end of the fourth segment. The transverse opening size of the distal region 13a is equal to the sum of the transverse opening width of the first segment and the longitudinal opening height of the second segment, and the transverse opening size of the proximal region 13b is equal to the sum of the transverse opening width of the third segment and the longitudinal opening height of the fourth segment. Therefore, the nail hole 13 is formed at the bend 14 of the nail cartridge cover 1, forming a three-dimensional nail hole 13. Compared with the nail holes 13 in the prior art that are only opened on the upper plate 11, it has a larger three-dimensional opening space and can accommodate more tissue when the jaws are closed. Figure 14As shown, the staple cartridge cover 1 includes an upper plate 11, side plates 12 located on both sides of the upper plate 11, and a bottom plate 15. The upper plate 11 and the bottom plate 15 are arranged opposite each other in the longitudinal direction, and the two side plates 12 are arranged opposite each other in the transverse direction. The side plates 12 are disposed between the upper plate 11 and the bottom plate 15, and multiple matching staples 3 are respectively provided at the two bends between the upper plate 11 and the two side plates 12.

[0051] In this embodiment, "lateral" refers to the width direction, which is parallel to the upper plate 11; "longitudinal" refers to the height direction, which is parallel to the side plate 12. In this embodiment, the staple cartridge assembly 10 has two staple cartridge covers 1, and an axially extending blade groove 5 is formed between the two staple cartridge covers 1 to provide a channel for the axial movement of the cutter. The side plates 12 of the two staple cartridge covers 1 are not parallel but form an angle, therefore, the lateral and longitudinal directions of the two staple cartridge covers 1 correspond to different directions. Figure 10 and Figure 14 The transverse and longitudinal directions of one side of the staple cartridge cover 1 are marked exemplarily. Figure 14 Taking the staple cartridge cover 1 shown in the figure as an example, its horizontal direction is D2, which is parallel to the upper plate 11, and its vertical direction is D3, which is parallel to the lower plate 12.

[0052] Figures 13-16 The structure of the staple cartridge cover 1 in this embodiment is shown. For example... Figures 8-16 As shown, in this embodiment, the distal region 13a of the nail hole 13 includes a first sidewall 131 and a second sidewall 132 disposed opposite to each other. The distal end of the first sidewall 131 is connected to a first side of the distal surface of the nail hole 13, the proximal end of the first sidewall 131 is connected to the distal end of a third sidewall 133, and the proximal end of the third sidewall 133 is connected to the first side of the proximal surface of the nail hole 13. The proximal region 13b of the nail hole 13 includes a third sidewall 133 and a fourth sidewall 134 disposed opposite to each other. The distal end of the second sidewall 132 is connected to a second side of the distal surface of the nail hole 13, the proximal end of the second sidewall 132 is connected to the distal end of the fourth sidewall 134, and the proximal end of the fourth sidewall 134 is connected to the second side of the proximal surface of the nail hole 13.

[0053] In this embodiment, the first sidewall 131 of the distal region 13a protrudes outward relative to the third sidewall 133 of the proximal region 13b, and the second sidewall 132 of the distal region 13a protrudes outward relative to the fourth sidewall 134 of the proximal region 13b, thereby making the lateral opening size of the distal region 13a larger than that of the proximal region 13b. In this embodiment, the inner and outer sides of the nail hole 13 are relative to the centerline of the nail hole 13 (e.g., ...). Figure 9Regarding S0), for the nail hole 13, the side closer to its center line is the inner side, and the side farther from its center line is the outer side. For the first sidewall 131 of the distal region 13a, it protrudes away from the side plate 12 relative to the third sidewall 133 of the proximal region 13b; for the second sidewall 132 of the distal region 13a, it protrudes downward relative to the fourth sidewall 134 of the proximal region 13b.

[0054] In this embodiment, a first sidewall 131 is located on the side of the first segment away from the second segment, and a second sidewall 132 is located on the side of the second segment away from the first segment. A third sidewall 133 is located on the side of the third segment away from the fourth segment, and a fourth sidewall 134 is located on the side of the fourth segment away from the third segment. The first sidewall 131 and the third sidewall 133 are parallel to the side plate 12, and the second sidewall 132 and the fourth sidewall 134 are parallel to the top plate 11. The height of the first sidewall 131 is higher than the height of the second sidewall 132, and the height of the third sidewall 133 is higher than the height of the fourth sidewall 134.

[0055] In this embodiment, the first sidewall 131 of the distal region 13a protrudes away from the side plate 12 relative to the third sidewall 133 of the proximal region 13b, making the lateral opening width of the first segment greater than that of the third segment. When the stapler is fired, even if the staple 3 shifts laterally toward the first sidewall 131, it is less likely to become stuck. The second sidewall 132 of the distal region 13a protrudes downward relative to the fourth sidewall 134 of the proximal region 13b, making the longitudinal opening height of the second segment greater than that of the fourth segment. When the stapler is fired, even if the staple 3 shifts longitudinally toward the second sidewall 132, it is less likely to become stuck.

[0056] like Figures 14-16As shown, in this embodiment, the first sidewall 131 of the distal region 13a is formed as an arcuate surface protruding outwards from the nail hole 13. The projection of the portion 135 of the distal region 13a protruding relative to the proximal region 13b onto the upper plate 11 is a fan shape or a portion of a fan shape. There is a smooth transition between the proximal end of the first sidewall 131 of the nail hole 13 and the distal end of the third sidewall 133. The second sidewall 132 of the distal region 13a is formed as an arcuate surface protruding outwards from the nail hole, such that the projection of the portion of the distal region 13a protruding relative to the proximal region 13b onto the side plate 12 is a fan shape or a portion of a fan shape. There is a smooth transition between the proximal end of the second sidewall 132 of the nail hole 13 and the distal end of the fourth sidewall 134. The third sidewall 133 and the fourth sidewall 134 of the nail hole 13 extend axially. In other embodiments, the first sidewall 131 of the distal region 13a may also be formed in other shapes, such as a right-angled surface or an inclined surface protruding outwards, so that the projection of the portion of the distal region 13a protruding relative to the proximal region 13b onto the upper plate 11 is rectangular, trapezoidal, or the like. The second sidewall 132 of the distal region 13a may also be formed in other shapes, such as a right-angled surface or an inclined surface protruding outwards, so that the projection of the portion of the distal region 13a protruding relative to the proximal region 13b onto the side plate 12 is rectangular, trapezoidal, or the like.

[0057] In this embodiment, a plurality of nail forming grooves are provided on the side of the nail anvil facing the nail cartridge assembly 10. Optionally, the shape of the nail forming groove is adapted to the shape of the nail hole 13. The nail forming groove includes a distal portion and a proximal portion. The groove width of the distal portion of the nail forming groove is greater than the groove width of the proximal portion of the nail forming groove, so as to ensure that even if the matching nail 3 is laterally or longitudinally offset, the nail feet of the matching nail 3 can still be aligned with the nail forming groove.

[0058] like Figure 17 As shown, in another alternative embodiment, the surfaces of the first sidewall 131 and the third sidewall 133 of the nail hole 13 are a continuous inclined surface, and from the proximal end of the third sidewall 133 to the distal end of the first sidewall 131, the inclined surface gradually extends outward (away from the side plate 12), so that the first segment of the nail hole 13 has a greater lateral opening width than the third segment. The surfaces of the second sidewall 132 and the fourth sidewall 134 of the nail hole 13 are a continuous inclined surface, and from the proximal end of the fourth sidewall 134 to the distal end of the second sidewall 132, the inclined surface gradually extends outward (away from the upper plate 11), so that the longitudinal opening height of the second segment of the nail hole 13 is greater than the longitudinal opening width of the fourth segment. Other structures in this embodiment are the same as those in the aforementioned embodiments, and will not be described again here.

[0059] The above embodiments are illustrated using the example of the first sidewall 131 protruding outward relative to the third sidewall 133 and the second sidewall 132 protruding outward relative to the fourth sidewall 134. In other alternative embodiments, the outwardly protruding sidewalls can be provided only on one side of the distal region 13a of the staple hole 13. For example, only the first sidewall 131 can be provided to protrude outward relative to the third sidewall 133, while the second sidewall 132 does not protrude outward relative to the fourth sidewall 134; or, only the second sidewall 132 can be provided to protrude outward relative to the fourth sidewall 134, while the first sidewall 131 does not protrude outward relative to the third sidewall 133. This also reduces the risk of the staple 3 becoming stuck with the sidewall of the staple hole 13 when it shifts. In practical applications, the outwardly shifting sidewall can be selected according to actual needs. For example, for the staple cartridge assembly 10 that is prone to lateral displacement during use, its first sidewall 131 protrudes outward relative to the third sidewall 133; for the staple cartridge assembly 10 that is prone to longitudinal displacement during use, its second sidewall 132 protrudes outward relative to the fourth sidewall 134.

[0060] The above embodiment uses the bent portion 14 between the upper plate 11 and the side plate 12 as an example to illustrate the nail hole 13. In another alternative embodiment, the nail hole may be provided only on the upper plate 11. In this case, the lateral opening size of the distal region of the nail hole is the lateral opening width of the distal region on the upper plate 11 (the lateral distance between the first and second side walls of the nail hole), and the lateral opening size of the proximal region of the nail hole is the lateral opening width of the proximal region on the upper plate 11 (the lateral distance between the third and fourth side walls of the nail hole). By making the lateral opening width of the distal region greater than that of the proximal region, even if the matching nail 3 undergoes a certain lateral offset, it is not easy to interfere with the first and second side walls, thereby reducing the risk of the nail foot 31 getting stuck in the nail hole. Specifically, the first side wall of the nail hole protrudes outward relative to the third side wall, and / or the second side wall of the nail hole protrudes outward relative to the fourth side wall.

[0061] In summary, the staple cartridge assembly, jaw assembly, and surgical stapler provided in this application have the following beneficial effects:

[0062] By adopting the staple cartridge assembly of this application, the distal region of the staple hole has a larger lateral opening size than the proximal region. When the stapler is fired, the staple foot protrudes outward from the distal region with a larger lateral opening size. Even if the staple foot is slightly offset, it is not easy to interfere with the side wall of the staple hole, reducing the risk of the staple foot getting stuck in the staple hole and being unable to pass out smoothly, thus effectively improving the suturing effect.

[0063] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A staple cartridge assembly, characterized in that, For a surgical stapler, the staple cartridge assembly includes: The staple tape includes a staple tape body and a plurality of staples, wherein each staple includes a staple connector and a staple foot, and the staple connector is rotatably mounted on the staple tape body; A staple cartridge cover is disposed outside the staple belt. The staple cartridge cover has multiple staple holes, each staple hole including a distal region and a proximal region. When the stapler is fired, the staple prongs pass through the distal region of the staple hole. The lateral opening size of the distal region of the staple hole is larger than the lateral opening size of the proximal region.

2. The staple cartridge assembly according to claim 1, characterized in that, The distal region of the nail hole includes a first sidewall and a second sidewall disposed opposite to each other, and the proximal region of the nail hole includes a third sidewall and a fourth sidewall disposed opposite to each other. The proximal end of the first sidewall is connected to the distal end of the third sidewall, and the proximal end of the second sidewall is connected to the distal end of the fourth sidewall. Wherein, the first sidewall of the distal region protrudes outward from the nail hole relative to the third sidewall of the proximal region, and / or, the second sidewall of the distal region protrudes outward from the nail hole relative to the fourth sidewall of the proximal region.

3. The staple cartridge assembly according to claim 2, characterized in that, The first sidewall of the distal region is formed as an arcuate surface protruding outward from the nail hole, and / or the second sidewall of the distal region is formed as an arcuate surface protruding outward from the nail hole.

4. The staple cartridge assembly according to claim 2, characterized in that, The surfaces of the first and third sidewalls of the nail hole are continuous inclined surfaces, and / or the surfaces of the second and fourth sidewalls of the nail hole are continuous inclined surfaces.

5. The staple cartridge assembly according to claim 2, characterized in that, The proximal end of the first sidewall of the nail hole and the distal end of the third sidewall smoothly transition, and the proximal end of the second sidewall of the nail hole and the distal end of the fourth sidewall smoothly transition.

6. The staple cartridge assembly according to claim 1, characterized in that, The staple cartridge cover includes an upper plate and at least one side plate. The distal region of the staple hole includes a first segment and a second segment that are connected to each other. The proximal region of the staple hole includes a third segment and a fourth segment that are connected to each other. The first segment and the third segment are located on the upper plate, and the second segment and the fourth segment are located on the side plate. The lateral opening size of the distal region is equal to the sum of the lateral opening width of the first segment and the longitudinal opening height of the second segment, and the lateral opening size of the proximal region is equal to the sum of the lateral opening width of the third segment and the longitudinal opening height of the fourth segment.

7. The staple cartridge assembly according to claim 6, characterized in that, The lateral opening width of the first segment is greater than the lateral opening width of the third segment, and / or the longitudinal opening height of the second segment is greater than the longitudinal opening height of the fourth segment.

8. The staple cartridge assembly according to claim 6, characterized in that, The first segment has a first sidewall on the side away from the second segment, and the second segment has a second sidewall on the side away from the first segment. The first sidewall is parallel to the side plate, and the second sidewall is parallel to the top plate.

9. The staple cartridge assembly according to claim 1, characterized in that, The staple cartridge cover includes an upper plate, the staple holes are formed on the upper plate, the lateral opening size of the distal region is equal to the lateral width of the distal region, and the lateral opening size of the proximal region is equal to the lateral width of the proximal region.

10. A jaw assembly, characterized in that, Includes the anvil and the staple cartridge assembly according to any one of claims 1 to 9.

11. The jaw assembly according to claim 10, characterized in that, The anvil has a plurality of nail forming grooves on the side facing the nail cartridge assembly. Each nail forming groove includes a distal portion and a proximal portion. The groove width of the distal portion of the nail forming groove is greater than the groove width of the proximal portion of the nail forming groove.

12. A surgical stapler, characterized in that, Includes the staple cartridge assembly according to any one of claims 1 to 9 or the jaw assembly according to claim 10.

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