Anvil, jaw assembly, and surgical stapler

Abstract

The application provides a staple anvil, a jaw assembly and a surgical stapler. The staple anvil comprises a staple anvil surface, and a plurality of staple forming grooves are formed in the staple anvil surface. Each staple forming groove comprises a bottom wall and two side walls arranged opposite to each other in the transverse direction. In the cross section of the staple forming groove, at least one side wall is arranged obliquely relative to the height direction of the staple forming groove, so that the opening width of the staple forming groove at the staple anvil surface is greater than the width of the bottom wall of the staple forming groove, and the included angle between the obliquely arranged side wall and the height direction of the staple forming groove is less than 45°. The staple forming groove of the application comprises a bottom wall and two side walls, and at least one side wall is arranged obliquely, so that the staple forming groove has a larger opening width, the alignment of the staple leg of the anastomosis staple and the staple forming groove can be ensured during the firing of the stapler, the included angle between the obliquely arranged side wall and the height direction is less than 45°, the side wall can guide the staple leg to the bottom wall more quickly, the stability of the cooperation between the staple leg and the staple forming groove is improved, and the staple forming quality is improved.

Description

Technical Field

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

[0002] Surgical staplers generally consist of an instrument platform and a jaw assembly mounted distal to the instrument platform. The jaw assembly includes a staple cartridge assembly and an anvil, both positioned opposite each other. The staple cartridge assembly contains staples, and the anvil surface has multiple staple-forming grooves. A jaw is formed between the staple cartridge assembly and the anvil for gripping tissue. When the stapler is fired, the staples in the staple cartridge assembly are pushed outwards. After piercing the tissue, the staples are closed by the staple-forming grooves on the anvil. Small-diameter surgical staplers have smaller jaw assemblies compared to traditional staplers, making them more suitable for the miniaturization of instruments. Figure 1 and Figure 2 The structure of the anvil of an existing small-diameter surgical stapler is shown. Figure 3 and Figure 4 A cross-sectional view of an existing jaw assembly is shown.

[0003] like Figures 1-2 As shown, the anvil 101 includes an anvil surface 1010, and the anvil surface 1010 is provided with a plurality of nail forming grooves 1011. For example... Figure 3 and Figure 4 As shown, in small-diameter minimally invasive instruments, to make more efficient use of space, the cross-section of the staple cartridge surface of the staple cartridge assembly 102 is inclined rather than flat, and correspondingly, the cross-section of the anvil surface 1010 is inclined rather than flat. This results in a change in the alignment between the staple outlet hole and the staple forming groove 1011 of the staple cartridge assembly 102 when the distance between the staple cartridge assembly 102 and the anvil 101 is different after the jaws are closed. This affects the alignment of the staple feet 10231 of the anastomotic staple 1023 with the staple forming groove 1011, leading to poor staple forming.

[0004] like Figures 1-4 As shown, to better accommodate the pin 1023 and prevent the pin 10231 from shifting during the closing process and failing to properly enter the pin forming groove 1011, the inner wall 1012 of the pin forming groove 1011 is curved. During the closing process, the pin 10231 of the matching pin 1023 contacts the inner wall 1012 of the pin forming groove 1011 and is guided into the interior of the pin forming groove 1011. The matching pin 1023 is formed by stamping, and the cross-section at the pin 10231 is a rectangular plane. When the pin 10231 contacts the curved inner wall 1012 of the pin forming groove 1011, the rectangular cross-section forms a point contact with the curved inner wall 1012, which may cause the pin 10231 to get stuck and fail to be guided to close smoothly. Utility Model Content

[0005] In view of the problems in the prior art, the purpose of this application is to provide a staple anvil, jaw assembly and surgical stapler to improve the stability of the fit between the staple feet and the staple forming groove, thereby improving the staple forming quality.

[0006] This application provides an anvil for a surgical stapler. The anvil includes an anvil surface with a plurality of staple forming grooves. Each staple forming groove includes a bottom wall and two side walls arranged laterally opposite each other. In the cross-section of the staple forming groove, at least one side wall is inclined relative to the height direction of the staple forming groove, so that the opening width of the staple forming groove at the anvil surface is greater than the width of the bottom wall of the staple forming groove, and the angle between the inclined side wall and the height direction of the staple forming groove is less than 45°.

[0007] In some embodiments, the anvil surface is further provided with a feed groove extending axially, and the anvil surface includes a first surface and a second surface located on both sides of the feed groove, the first surface and the second surface forming an included angle.

[0008] In some embodiments, in the cross-section of the nail forming groove, the two sidewalls are respectively inclined relative to the height direction of the nail forming groove, and the two sidewalls are symmetrically arranged with respect to the center line of the nail forming groove.

[0009] In some embodiments, in the cross-section of the nail forming groove, the bottom wall of the nail forming groove is parallel to the nail anvil surface.

[0010] In some embodiments, in the cross-section of the stapling groove, the ratio of the opening width of the stapling groove at the stapling anvil surface to the width of the matching stapling is 1.5 to 4.

[0011] In some embodiments, in a top view of the anvil, the opening of the nail forming groove at the anvil surface is a first rectangle, and the bottom wall of the nail forming groove is a second rectangle.

[0012] In some embodiments, the plurality of nail forming grooves include a plurality of distal nail forming grooves and a plurality of proximal nail forming grooves, wherein the depth of the distal nail forming grooves is greater than the depth of the proximal nail forming grooves.

[0013] In some embodiments, the depth of the nail forming groove increases sequentially from the proximal end to the distal end of the nail anvil surface; or,

[0014] The anvil surface includes a proximal region and a distal region, with the depth of the nail-forming groove in the distal region being greater than the depth of the nail-forming groove in the proximal region.

[0015] In some embodiments, the plurality of nail forming grooves include a plurality of distal nail forming grooves and a plurality of proximal nail forming grooves, wherein the opening width of the distal nail forming groove is greater than the opening width of the proximal nail forming groove.

[0016] In some embodiments, the plurality of nail forming grooves include multiple rows of nail forming grooves arranged laterally, wherein in each row of nail forming grooves, the lateral distance between the distal nail forming groove and the cutting groove of the anvil is greater than the lateral distance between the proximal nail forming groove and the cutting groove.

[0017] In some embodiments, the nail-shaped groove further includes a distal wall and a proximal wall, with the distal wall and the proximal wall respectively forming an arc transition with the bottom wall.

[0018] The second aspect of this application provides a jaw assembly, characterized in that it includes a staple cartridge assembly and a staple anvil of the first aspect disposed opposite to each other. The staple cartridge assembly includes at least one staple tape body and a plurality of staples. The staples include a staple connector, a staple beam and a staple foot. The staple connector is rotatably connected to the staple tape body.

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

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

[0021] The staple forming groove of this application includes a bottom wall and two side walls, and at least one side wall is inclined, so that the staple forming groove has a larger opening width. When the stapler is fired, it can ensure that the staple foot of the staple is aligned with the staple forming groove, and the inclined side wall can guide the staple foot to the bottom wall. The angle between the inclined side wall and the height direction of the staple forming groove is less than 45°, so that the side wall can guide the staple foot to the bottom wall more quickly, reducing the risk of the staple foot getting stuck at the inclined side wall, thereby improving the stability of the fit between the staple foot and the staple forming groove, and thus improving the staple forming quality. 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 schematic diagram of the structure of an anvil in the prior art;

[0024] Figure 2 This is a top view of an anvil in the prior art;

[0025] Figure 3 and Figure 4 This is a cross-sectional view of a jaw assembly in the prior art;

[0026] Figure 5 This is a schematic diagram of the structure of an anvil according to an embodiment of this application;

[0027] Figure 6 This is a top view of an anvil according to an embodiment of this application;

[0028] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0029] Figure 8 and Figure 9 This is a cross-sectional view of a jaw assembly according to an embodiment of this application;

[0030] Figure 10 This is a partial cross-sectional view of an anvil according to an embodiment of this application;

[0031] Figure 11 This is a partial schematic diagram of the cross-section of a jaw assembly according to an embodiment of this application; it corresponds to... Figure 8 A magnified view of a portion of the image;

[0032] Figure 12 This is a partial schematic diagram of the cross-section of a jaw assembly according to an embodiment of this application; it corresponds to... Figure 9 A magnified view of a portion of the image.

[0033] Figure label:

[0034] Existing technology:

[0035] 101-Anvil; 1010-Anvil surface; 1011-Nail forming groove; 1012-Inner wall of nail forming groove; 102-Nail cartridge assembly; 1023-Matching nail; 10231-Nail foot;

[0036] This application:

[0037] 1-Anvil; 10-Anvil surface; 110-First surface; 120-Second surface; 11-Nail forming groove; 111-First sidewall; 112-Second sidewall; 113-Distal wall; 114-Proximal wall; 115-Bottom wall; 12-Cut groove; 2-Nail cartridge assembly; 21-Nail cartridge cover; 22-Nail tape body; 23-Matching nail; 231-Nail foot; 2311-Bottom edge of nail foot section; 2312-Side edge of nail foot section. Detailed Implementation

[0038] 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 thorough 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. The words “or” and “or” in the specification may mean “and” or “or”. 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 according to 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.

[0039] This application provides an anvil, a jaw assembly, and a surgical stapler. The surgical stapler includes an instrument platform and a jaw assembly, the jaw assembly being mounted at the distal end of the instrument platform. The jaw assembly includes a staple cartridge assembly and an anvil disposed opposite each other. The staple cartridge assembly contains staples, and the anvil surface has multiple staple forming grooves. A jaw for clamping tissue is formed between the staple cartridge assembly and the anvil.

[0040] Figure 6 and Figure 7 The structure of an anvil 1 according to an embodiment of this application is shown. Figure 8 and Figure 9 Cross-sectional views of the jaw assembly at different closing heights are shown, illustrating the cross-sectional structures of the staple cartridge assembly 2 and the anvil 1. In this application, the “cross-section” of the anvil 1 and the staple cartridge assembly 2 refers to a section on a cutting plane perpendicular to the axial direction.

[0041] like Figures 6-9 As shown, in this embodiment, the jaw assembly includes a staple cartridge assembly 2 and a staple anvil 1. The staple cartridge assembly 2 includes at least one staple cartridge cover 21, at least one staple body 22, and a plurality of staples 23. The staple cartridge cover 21 is fitted over the staple body 22 and has a plurality of staple exit holes. The staples 23 include a staple connecting portion, a staple beam, and a staple foot 231. The staple connecting portion is rotatably connected to the staple body 22, and the staple beam connects the staple connecting portion and the staple foot 231. The staple anvil 1 includes a staple anvil surface 10, on which a plurality of staple forming grooves 11 are formed. When the stapler is fired, the drive inside the staple cartridge assembly 2 pushes the staples 23 toward the staple anvil 1. The staple foot 231 of the staple 23 first extends outward from the staple exit hole, pierces the tissue, and then closes and forms a shape under the guidance of the inner wall of the staple forming groove 11.

[0042] Figure 10A partial cross-sectional view of the anvil 1 in this embodiment is shown. Figures 6-10 As shown, each nail forming groove 11 includes a bottom wall 115 and two side walls arranged laterally opposite each other. In the cross-section of the nail forming groove 11, at least one side wall is inclined relative to the height direction of the nail forming groove 11, such that the opening width of the nail forming groove 11 at the nail anvil surface 10 is greater than the width of the bottom wall 115 of the nail forming groove 11, and the angle α between the inclined side wall and the height direction of the nail forming groove 11 is less than 45°. For example, the angle α between the inclined side wall and the height direction of the nail forming groove 11 is 40°, 30°, 25°, etc.

[0043] In this application, "distal" and "proximal" are relative to the operator; "distal" refers to the end furthest from the operator, and "proximal" refers to the end closest to the operator. Figure 6 From the perspective of "remote end" Figure 6 The left end in the perspective, the "proximal end" is Figure 6 The right end in the field of view. "Axial" refers to the direction from the distal end to the proximal end of the jaw assembly, or the direction from the proximal end to the distal end, i.e. Figure 6 The S1 direction in the diagram. "Transverse" refers to the width direction of the nail forming groove 11. The depth direction of the nail forming groove 11 is the height direction of the nail forming groove 11.

[0044] like Figure 8 and Figure 9 As shown, the surface of the staple cartridge assembly 2 facing the anvil 1 is the staple cartridge surface. This jaw assembly is used in small-diameter surgical staplers. To make more efficient use of space, the staple cartridge surface of the staple cartridge assembly 2 is inclined rather than flat. The anvil surface 10 of the anvil 1 is arranged parallel to the staple cartridge surface. The anvil surface 10 of the anvil 1 has an axially extending feed groove 12, providing a channel for the axial movement of the cutter. The anvil surface 10 includes a first surface 110 and a second surface 120 located on both sides of the feed groove 12, forming an angle between the first surface 110 and the second surface 120, and the first surface 110 and the second surface 120 are symmetrically arranged with respect to the feed groove 12. Therefore, on both sides of the feed groove 12, the "width direction" (lateral direction) of the staple forming groove 11 corresponds to different directions, and the "height direction" (longitudinal direction) of the staple forming groove 11 corresponds to different directions. Figure 8 From the perspective of the pin anvil 1 and pin cartridge assembly 2 on the left side of the feed groove 12, the "width direction" of the pin forming groove 11 is direction S21, and the "height direction" of the pin forming groove 11 is direction S31; for the part of the pin anvil 1 and pin cartridge assembly 2 on the right side of the feed groove 12, the "width direction" of the pin forming groove 11 is direction S22, and the "height direction" of the pin forming groove 11 is direction S32.

[0045] like Figure 8 and Figure 9As shown, due to the inclined arrangement of the staple cartridge surface of the staple cartridge assembly 2, the alignment between the staple dispensing hole and the staple forming groove 11 will change when the closing height is different (the distance between the staple anvil surface 10 and the staple cartridge surface is different). Figure 8 As shown, when the closure height is high (e.g., when clamping thicker tissue), pin 231 may shift laterally outward; as Figure 9 As shown, when the closure height is low (e.g., when clamping thin tissue), the staple foot 231 may shift laterally inward. The two sidewalls of the staple forming groove 11 include a first sidewall 111 relatively far from the feed groove 12 and a second sidewall 112 relatively close to the feed groove 12, and at least one sidewall is inclined, so that the staple forming groove 11 has a larger opening width, which can ensure the alignment of the staple foot 231 of the staple 23 with the staple forming groove 11 when the stapler is fired, and the inclined sidewall can guide the staple foot 231 to the bottom wall 115; wherein, the angle between the inclined sidewall and the height direction of the staple forming groove 11 is less than 45°, so that the sidewall can guide the staple foot 231 to the bottom wall 115 more quickly, reducing the risk of the staple foot 231 getting stuck at the inclined sidewall, thereby improving the stability of the fit between the staple foot 231 and the staple forming groove 11 and improving the staple forming quality.

[0046] like Figure 8 and Figure 9 As shown, in this embodiment, in the cross-section of the nail forming groove 11, the first sidewall 111 and the second sidewall 112 are respectively inclined relative to the height direction of the nail forming groove 11, and the first sidewall 111 and the second sidewall 112 are symmetrically arranged with respect to the center line of the nail forming groove 11, so that the matching nail 23 can enter the opening of the nail forming groove 11 whether it is offset to the left or to the right. However, this application is not limited to this. In other alternative embodiments, depending on the actual needs of the product, an inclined sidewall may be provided only on one side of the bottom wall 115; or the inclination angles of the two sidewalls may be different, which also falls within the protection scope of this application.

[0047] like Figure 8 , Figure 9 , Figure 11 and Figure 12As shown, after the staple enters the staple forming groove 11, the bottom edge 2311 of the staple foot 231 of the staple 23, at the position corresponding to the bottom wall 115 of the staple forming groove 11, is a straight line, and the connection between the bottom edge 2311 and the side edge 2312 of the staple foot 231 is almost a sharp angle. The angle between the inclined first side wall 111 of the staple forming groove 11 and the height direction of the staple forming groove 11 is less than 45°, so that the first side wall 111 can guide the staple foot 231 to the bottom wall 115 more smoothly, and be stably supported by the bottom wall 115, which also has a flat cross-section, forming a surface-to-surface contact, reducing the component force of staple forming, reducing the firing force, reducing the influence of staple angle tilting deformation caused by point contact of the contact surface, and improving the staple forming effect.

[0048] like Figure 7 As shown, in a top view of the anvil 1, the opening of the nail forming groove 11 at the anvil surface 10 is a first rectangle B1, and the bottom wall 115 of the nail forming groove 11 is a second rectangle B2. The size of the first rectangle B1 is larger than the size of the second rectangle B2. Optionally, the axial length of the first rectangle B1 is greater than the axial length of the second rectangle B2, and the width of the first rectangle B1 is greater than the width of the second rectangle B2.

[0049] like Figure 8 As shown, in the cross-section of the nail forming groove 11, the bottom wall 115 of the nail forming groove 11 is parallel to the anvil surface 10. Therefore, in the cross-section of the nail forming groove 11, the nail forming groove 11 has a trapezoidal structure, and the nail forming groove 11 as a whole is a three-dimensional frustum shape, and the width of the bottom wall 115 is smaller than the opening width of the nail forming groove 11 at the anvil surface 10. Optionally, the bottom wall 115 of the nail forming groove 11 is a plane parallel to the anvil surface 10. In this embodiment, in the cross-section of the nail forming groove 11, the ratio of the opening width of the nail forming groove 11 at the anvil surface 10 to the width of the matching nail 23 is 1.5 to 4, so as to ensure that even if the nail foot 231 of the matching nail 23 is deviated, it can still smoothly enter the nail forming groove 11, and will not occupy too much space on the anvil surface 10.

[0050] like Figure 7As shown, the stud forming groove 11 also includes a distal wall 113 and a proximal wall 114. The distal wall 113 is connected to the distal side of the bottom wall 115, and the proximal wall 114 is connected to the proximal side of the bottom wall 115. When the stud foot 231 of the matching stud 23 enters the stud forming groove 11, it bends closed from the distal end to the proximal end of the stud forming groove 11. The distal wall 113 and the proximal wall 114 are respectively arc transitions with the bottom wall 115, so that the stud foot 231 can smoothly transition from the distal wall 113 to the bottom wall 115, and can smoothly transition from the bottom wall 115 to the proximal wall 114. Optionally, the distal wall 113 and the proximal wall 114 are arc surfaces, or the distal wall 113 and the proximal wall 114 are inclined surfaces, with the distal wall 113 gradually inclined from its bottom side to the opening side towards the distal end, and the proximal wall 114 gradually inclined from its bottom side to the opening side towards the proximal end.

[0051] In one embodiment, the plurality of nail forming grooves 11 on the nail anvil surface 10 may have the same depth in the height direction of the nail forming groove 11.

[0052] In another embodiment, since the distance between the anvil 1 and the staple cartridge assembly 2 gradually increases from the proximal to the distal end of the anvil 1 after the jaws are closed, the staple forming height of the distal staple 23 is increased to ensure that the distal staple 23 can be stably sutured to the tissue. The plurality of staple forming grooves 11 include a plurality of distal staple forming grooves 11 and a plurality of proximal staple forming grooves 11. In the height direction of the staple forming grooves 11, the depth of the distal staple forming grooves 11 is greater than the depth of the proximal staple forming grooves 11, so that the distal staple 23 can achieve a greater staple forming height. Optionally, the depth of the staple forming grooves 11 increases sequentially from the proximal to the distal end of the anvil surface 10; the plurality of staple forming grooves 11 include multiple rows of staple forming grooves 11 arranged laterally, and for each row of staple forming grooves 11, the depth of each staple forming groove 11 is greater than the depth of its proximal staple forming groove 11 but less than the depth of its distal staple forming groove 11. Alternatively, the anvil surface 10 can be divided into a proximal region and a distal region. The staple forming grooves 11 in the distal region all have a first depth, and the staple forming grooves 11 in the proximal region all have a second depth, with the first depth being greater than the second depth. By making the depth of the distal staple forming grooves 11 greater than the depth of the proximal staple forming grooves 11, the difference in closure height between the distal and proximal ends can be effectively compensated, allowing both the distal and proximal anastomotic staples 23 to be stably sutured to the tissue.

[0053] In one embodiment, the plurality of nail forming grooves 11 on the nail anvil surface 10 may have the same opening width in the width direction of the nail forming groove 11.

[0054] In another embodiment, since the distance between the anvil 1 and the staple cartridge assembly 2 gradually increases from the proximal end to the distal end of the anvil 1 after the jaws are closed, the stud 231 of the distal matching staple 23 may have a greater lateral offset than the stud 231 of the proximal matching staple 23. Therefore, in the width direction of the staple forming groove 11, the opening width of the distal staple forming groove 11 is greater than the opening width of the proximal staple forming groove 11. Optionally, the opening width of the staple forming groove 11 increases sequentially from the proximal end to the distal end of the anvil surface 10; that is, for each row of staple forming grooves 11, the opening width of each staple forming groove 11 is greater than the opening width of its proximal staple forming groove 11 but less than the opening width of its distal staple forming groove 11. Alternatively, the anvil surface 10 can be divided into a proximal region and a distal region, where the staple forming grooves 11 in the distal region all have a first opening width, and the staple forming grooves 11 in the proximal region all have a second opening width, with the first opening width being greater than the second opening width. By making the opening width of the distal staple forming groove 11 greater than the opening width of the proximal staple forming groove 11, it can be ensured that the staple feet 231 of both the distal and proximal staples 23 can smoothly enter the staple forming groove 11 and close to form, thereby improving the staple forming quality of the distal and proximal staples 23.

[0055] In one embodiment, the individual nail forming grooves 11 in each row of nail forming grooves 11 are arranged axially, that is, for the same row of nail forming grooves 11, the lateral distance between each nail forming groove 11 and the cutting groove 12 is the same. Here, the lateral distance between the nail forming groove 11 and the cutting groove 12 is the distance in the width direction between the center of the nail forming groove 11 and the center line of the cutting groove 12.

[0056] In another embodiment, since the distance between the anvil 1 and the staple cartridge assembly 2 gradually increases from the proximal end to the distal end of the anvil 1 after the jaws are closed, the foot 231 of the distal staple 23 may be offset further outward than the foot 231 of the proximal staple 23. In each row of staple forming grooves 11, the lateral distance between the distal staple forming groove 11 and the cutting groove 12 of the anvil 1 is greater than the lateral distance between the proximal staple forming groove 11 and the cutting groove 12, that is, the distal staple forming groove 11 is farther away from the cutting groove 12 than the proximal staple forming groove 11, thereby accommodating the different foot 231 offset directions of the distal and proximal staples 23. Optionally, in each row of nail forming grooves 11, the lateral distance between the nail forming groove 11 and the cutting groove 12 gradually increases from the proximal end to the distal end of the anvil surface 10. That is, the lateral distance between each nail forming groove 11 and the cutting groove 12 is smaller than the lateral distance between the nail forming groove 11 and the cutting groove 12 at its distal end, but larger than the lateral distance between the nail forming groove 11 and the cutting groove 12 at its proximal end. Alternatively, the anvil surface 10 can be divided into a proximal region and a distal region. The nail forming grooves 11 and the cutting groove 12 in the distal region all have a first lateral distance, while the nail forming grooves 11 and the cutting groove 12 in the proximal region all have a second lateral distance, and the first lateral distance is greater than the second lateral distance. By making the distal nail forming groove 11 farther away from the cutting groove 12 than the proximal nail forming groove 11, the different offset directions of the nail feet 231 caused by the different closing heights from the proximal end to the distal end are well accommodated, so that both the distal and proximal anastomosing nails 23 can be well closed and formed.

[0057] In summary, the anvil, jaw assembly, and surgical stapler provided in this application have the following beneficial effects:

[0058] The staple forming groove of this application includes a bottom wall and two side walls, and at least one side wall is inclined, so that the staple forming groove has a larger opening width. When the stapler is fired, it can ensure that the staple foot of the staple is aligned with the staple forming groove, and the inclined side wall can guide the staple foot to the bottom wall. The angle between the inclined side wall and the height direction of the staple forming groove 11 is less than 45°, so that the side wall can guide the staple foot to the bottom wall more quickly, reducing the risk of the staple foot getting stuck at the inclined side wall, thereby improving the stability of the fit between the staple foot and the staple forming groove, and thus improving the staple forming quality.

[0059] 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. An anvil, characterized in that, For a surgical stapler, the anvil includes an anvil surface, and the anvil surface has a plurality of staple forming grooves, each of the staple forming grooves including a bottom wall and two side walls arranged laterally opposite to each other; Wherein, in the cross-section of the nail forming groove, at least one of the sidewalls is inclined relative to the height direction of the nail forming groove, so that the opening width of the nail forming groove at the nail anvil surface is greater than the width of the nail forming groove at the bottom wall, and the angle between the inclined sidewall and the height direction of the nail forming groove is less than 45°.

2. The anvil according to claim 1, characterized in that, The anvil surface is also provided with a tool groove extending along the axial direction. The anvil surface includes a first surface and a second surface located on both sides of the tool groove, and the first surface and the second surface form an included angle.

3. The anvil according to claim 1, characterized in that, In the cross-section of the nail forming groove, the two sidewalls are respectively inclined relative to the height direction of the nail forming groove, and the two sidewalls are symmetrically arranged with respect to the center line of the nail forming groove.

4. The anvil according to claim 1, characterized in that, In the cross-section of the nail forming groove, the bottom wall of the nail forming groove is parallel to the nail anvil surface.

5. The anvil according to claim 1, characterized in that, In the cross-section of the nail forming groove, the ratio of the opening width of the nail forming groove at the nail anvil surface to the width of the matching nail is 1.5 to 4.

6. The anvil according to claim 1, characterized in that, In a top view of the anvil, the opening of the nail forming groove at the anvil surface is a first rectangle, and the bottom wall of the nail forming groove is a second rectangle.

7. The anvil according to claim 1, characterized in that, The plurality of nail forming grooves includes a plurality of distal nail forming grooves and a plurality of proximal nail forming grooves, wherein the depth of the distal nail forming grooves is greater than the depth of the proximal nail forming grooves.

8. The anvil according to claim 7, characterized in that, The depth of the nail forming groove increases sequentially from the proximal end to the distal end of the nail anvil surface; or, The anvil surface includes a proximal region and a distal region, wherein the depth of the nail-forming groove in the distal region is greater than the depth of the nail-forming groove in the proximal region.

9. The anvil according to claim 1, characterized in that, The plurality of nail forming grooves includes a plurality of distal nail forming grooves and a plurality of proximal nail forming grooves, wherein the opening width of the distal nail forming groove is greater than the opening width of the proximal nail forming groove.

10. The anvil according to claim 1, characterized in that, The plurality of nail forming grooves include multiple rows of nail forming grooves arranged laterally. In each row of nail forming grooves, the lateral distance between the distal nail forming groove and the cutting groove of the anvil is greater than the lateral distance between the proximal nail forming groove and the cutting groove.

11. The anvil according to claim 1, characterized in that, The nail-shaped groove also includes a distal wall and a proximal wall, and the distal wall and the proximal wall are respectively connected to the bottom wall by arc transitions.

12. A jaw assembly, characterized in that, The device includes a staple cartridge assembly disposed opposite to each other and a staple anvil as described in any one of claims 1 to 11. The staple cartridge assembly includes at least one staple tape body and a plurality of staples, each staple including a staple connector, a staple beam and a staple foot, the staple connector being rotatably connected to the staple tape body.

13. A surgical stapler, characterized in that, Includes the anvil according to any one of claims 1 to 11, or the jaw assembly according to claim 12.

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