Nail bin assembly and surgical anastomat
By incorporating internal and external protrusions to constrain staple legs within the staple cartridge, the issue of staple misalignment is resolved, resulting in improved staple formation and tissue fusion.
Patent Information
- Application Number
- CN202510736969.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-04
- Publication Date
- 2025-07-15
AI Technical Summary
In existing surgical staplers, the proximal nail legs of the anastomosis staple easily shift to the distal end and lateral side of the jaw during tissue slippage, resulting in failure of the anastomosis staple forming and affecting the tissue anastomosis effect.
A first protrusion and/or a second protrusion are provided in the nail hole of the nail cartridge assembly to constrain the proximal nail legs of the staple by the displacement restriction structure to ensure that they remain within the nail hole during the driving of the nail drive and avoid offset.
Effectively prevent the proximal nail leg from moving distal and lateral to ensure successful forming of the staple and improve the tissue anastomosis effect.
Smart Images
Figure CN120304896A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of medical devices, and particularly to a staple cartridge assembly and a surgical stapler. Background Art
[0002] A surgical stapler generally includes an instrument platform, an actuator, and a slender rod body that mounts the actuator at the distal end of the instrument platform. The actuator includes a staple cartridge assembly and an anvil disposed opposite to each other, and the staple cartridge assembly and the anvil are hinged to form a jaw for clamping tissue. The staple cartridge assembly includes a staple cartridge body and a plurality of anastomosis staples, and the anastomosis staples are movably disposed in the staple holes of the staple cartridge body. During the firing process of the surgical stapler, the tissue in the jaw is jointly squeezed by the anvil, the staple cartridge assembly, and the cutting driving member, resulting in a slippage phenomenon. The flow direction thereof presents a characteristic of extending towards the distal end of the jaw and being accompanied by radial diffusion. During this process, the staple legs of the anastomosis staples that exit from the staple holes and contact the tissue tend to move towards the distal end of the jaw and the outside of the jaw. Among them, the distal side of the distal staple leg of the anastomosis staple is blocked by the distal inner wall of the staple hole, overcoming the deviation or skew caused by its movement towards the distal end and the outside of the jaw; while the distal side of the proximal staple leg of the anastomosis staple has no blocking structure. When affected by tissue slippage, the proximal staple leg is prone to move towards the distal end and the outside of the jaw, resulting in deviation or skew, and thus cannot be aligned and embedded into the corresponding forming groove of the anvil, leading to the failure of staple forming and affecting the tissue anastomosis effect. Summary of the Invention
[0003] Aiming at the problems in the prior art, the purpose of the present application is to provide a staple cartridge assembly and a surgical stapler, which can restrain the proximal staple legs of the anastomosis staples during the firing of the stapler by setting a first protrusion portion, so as to improve the staple forming effect.
[0004] The first aspect of the present application provides a staple cartridge assembly for a surgical stapler, and the staple cartridge assembly includes:
[0005] A staple cartridge body, including a staple cartridge surface and a cutter groove, and the staple cartridge body is provided with a plurality of staple holes communicating with the staple cartridge surface. Each staple hole includes opposite distal and proximal ends, and the plurality of staple holes are arranged in an array on both sides of the cutter groove;
[0006] A displacement limiting structure, which is disposed near the proximal end of the staple hole, and the displacement limiting structure includes:
[0007] A first protrusion portion, which is disposed inside the staple hole and protrudes towards the center of the staple hole; and / or
[0008] A second protrusion portion, which protrudes on the staple cartridge surface and is located on one side of the outer side wall of the staple hole,
[0009] The outer side wall is away from the cutter groove;
[0010] A plurality of anastomosis staples, which are movably disposed in the corresponding staple holes; and
[0011] A plurality of staple drivers movably disposed in corresponding staple holes, and each staple driver receives and drives a corresponding staple;
[0012] Wherein, after the staple driver drives the corresponding staple to move a first stroke, the tip of the staple protrudes from the staple hole, and the staple driver continues to drive the corresponding staple to move into a second stroke; during the second stroke, the proximal leg of the staple is constrained between the proximal side wall of the staple hole and the proximal side wall of the first protrusion, and / or, the displacement of the part of the proximal leg of the staple protruding from the staple hole and expanding outward is blocked by the second protrusion.
[0013] In some embodiments, a relief portion is provided at the proximal end of each staple driver. When the staple driver continues to drive the corresponding staple to move into the second stroke, the relief portion is aligned with the first protrusion so that the relief portion moves along the first protrusion.
[0014] In some embodiments, when the staple and the staple driver are in the initial position, the relief portion is aligned with the first protrusion, wherein, during the first stroke and the second stroke, the relief portion always moves along the first protrusion.
[0015] In some embodiments, the first protrusion continuously extends from the side of the staple hole close to the cartridge surface to the side of the staple hole far from the cartridge surface.
[0016] In some embodiments, the first protrusion is a long strip protrusion or a wedge-shaped protrusion.
[0017] In some embodiments, the first protrusion has a vertical side wall parallel to the outer side wall, or the vertical side wall is inclined relative to the outer side wall.
[0018] In some embodiments, the first protrusion further includes a connecting plane flush with or higher than the cartridge surface.
[0019] In some embodiments, when the vertical side wall is inclined relative to the outer side wall, the lower end of the vertical side wall is connected to the outer side wall, and the upper end of the vertical side wall is connected to the cartridge surface through the connecting plane, so that an acute angle is formed between the vertical side wall and the outer side wall.
[0020] In some embodiments, the displacement limiting structure includes a first protrusion and a second protrusion, wherein the second protrusion extends toward the inside of the staple hole and is connected to the first protrusion.
[0021] In some embodiments, the first protrusion and the second protrusion are integrally formed.
[0022] In some embodiments, the thickness of the first protrusion protruding from the outer side wall toward the inside of the staple hole is half of the diameter of the proximal leg.
[0023] The second aspect of the present application further provides a surgical stapler, including the cartridge assembly of any one of the above.
[0024] The cartridge assembly and the surgical stapler provided by the present application have the following advantages:
[0025] By providing a displacement limiting structure in the staple hole, the proximal leg of the staple is constrained when the stapler is fired. When the staple driver drives the corresponding staple to move into the second stroke, the proximal leg of the staple is constrained between the proximal side wall of the staple hole and the proximal side wall of the first protrusion, and / or the displacement of the part of the proximal leg of the staple exposed from the staple hole expanding outward is blocked by the second protrusion, avoiding the forming failure due to the proximal leg of the staple moving towards the distal end and outside the jaw, improving the forming effect of the staple, and further improving the tissue anastomosis effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.
[0027] Figure 1 is a schematic structural diagram of an actuator according to an embodiment of the present application;
[0028] Figure 2 is a schematic structural diagram of a cartridge body according to an embodiment of the present application;
[0029] Figure 3 is Figure 2 an enlarged view of part A in
[0030] Figure 4 is a schematic structural diagram of a cartridge body according to an embodiment of the present application;
[0031] Figure 5 is Figure 4 an enlarged view of part B in
[0032] Figure 6 is a schematic partial structural diagram of a cartridge assembly according to an embodiment of the present application;
[0033] Figure 7 is a schematic diagram of the cooperation between a cartridge body, staples, and a staple driver according to an embodiment of the present application;
[0034] Figure 8 is a schematic structural diagram of the cooperation between staples and a staple driver according to an embodiment of the present application;
[0035] Figure 9 is a schematic diagram of the cooperation between a cartridge body and staples according to an embodiment of the present application;
[0036] Figure 10 is a schematic diagram of the cooperation between a cartridge body and staples according to another embodiment of the present application;
[0037] Figure 11 is a top view of a cartridge assembly according to another embodiment of the present application;
[0038] Figure 12 is Figure 11 a cross-sectional view taken along the C-C direction in
[0039] Figure 13 a cross-sectional view of a cartridge assembly according to still another embodiment of the present application;
[0040] Figure 14 is a schematic structural view of an anvil in an embodiment of the present application. Detailed Embodiments
[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various 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 example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their repetitive description will be omitted. The "or" or "or" in the specification may both represent "and" or "or". Although terms such as "upper", "lower", "between" etc. may be used in this specification to describe different exemplary features and elements of the present application, these terms are used herein only for convenience, for example, according to the directions of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional direction of the structure to fall within the scope of the present application. Although terms such as "first" or "second" etc. are used in this specification to represent certain features, they are only for representational purposes and not as limitations on the quantity and importance of the specific features.
[0042] To solve the technical problem of poor formation of anastomosis staples in the prior art, the present application provides a cartridge assembly and a surgical stapler including the cartridge assembly. The surgical stapler includes an instrument platform and an actuator mounted at the distal end of the instrument platform. The actuator includes a cartridge assembly and an anvil disposed opposite to each other. The present application provides a first protrusion in the staple holes of the cartridge assembly to restrain the proximal legs of the anastomosis staples when the stapler is fired, improving the staple formation effect.
[0043] The structures of the cartridge assembly and the anvil in each embodiment will be described below with reference to the accompanying drawings.
[0044] As Figure 1-8 and Figure 14As shown in the figure, the actuating mechanism includes a cartridge assembly 10 and an anvil 8 which are oppositely arranged. The proximal ends of the cartridge assembly 10 and the anvil 8 are hingedly connected, so that the jaws 9 formed by the cartridge assembly 10 and the anvil 8 can be switched between an open state and a closed state. A plurality of forming grooves 81 are provided on one side surface of the anvil 8 facing the cartridge assembly 10. The cartridge assembly 10 includes a cartridge body 1, a displacement limiting structure, a plurality of staples 3 and a plurality of staple drivers 4. One side surface of the cartridge body 1 facing the anvil 8 is a cartridge surface 11. A plurality of staple holes 12 communicating with the cartridge surface 11 are provided in the cartridge body 1. Each staple hole 12 includes opposite distal ends 121 and proximal ends 122. The cartridge body 1 further includes a cutter groove 13 extending axially. The plurality of staple holes 12 are arranged in an array on both sides of the cutter groove 13. The displacement limiting structure is provided near the proximal ends of the staple holes 12. The displacement limiting structure includes a first protrusion 2. The first protrusion 2 is provided inside the staple hole 12 and protrudes towards the center of the staple hole 12, and the first protrusion 2 is close to the proximal end 122. Each staple 3 is movably arranged in a corresponding staple hole 12, and each staple driver 4 is movably arranged in a corresponding staple hole 12, and each staple driver 4 receives and drives a corresponding staple 3. Among them, in the initial state, the proximal staple legs 322 of the staple 3 are received in the proximal end 122, and the distal staple legs 321 of the staple are received in the distal end 121.
[0045] Figures 6-8 In the figure, only one staple 3 and one staple driver 4 are exemplarily shown. The staple driver 4 and the staple 3 can be in a one-to-one correspondence relationship, that is, each staple driver 4 drives one staple 3, or the staple driver 4 and the staple 3 can be in a one-to-many relationship, that is, each staple driver 4 drives a plurality of staples 3 at the same time.
[0046] During the operation, first, the cartridge assembly 10 and the anvil 8 of the jaws 9 are driven to pivot and close relative to each other to clamp the tissue. The staple driver 4 pushes the staple 3 in the cartridge assembly 10 towards the anvil 8. The staple 3 is closed and formed at the forming groove 81 of the anvil 8 to be sutured on the tissue. In the initial state before the stapler is fired, the staple legs of the staple 3 are located inside the staple hole 12 and will not expose from the top of the staple hole 12, avoiding damage to the tissue by the staple legs before the stapler is fired. During the firing process of the stapler, the moving process of the staple driver 4 driving the staple 3 includes a first stroke and a second stroke. The first stroke refers to the process from the initial state to the state where the tip (the end of the staple leg) of the staple 3 driven by the staple driver 4 just exposes from the staple hole 12. That is, after the staple driver 4 drives the corresponding staple 3 to move the first stroke, the tip of the staple 3 exposes from the staple hole 12.
[0047] The second stroke refers to the process from the state where the tip (the end of the staple leg) of the staple 3 just emerges from the staple hole 12 until the staple driver 4 drives the staple 3 to continue moving towards the anvil 8 until the staple 3 is closed and formed at the forming groove 81. Therefore, during the second stroke, the tip of the staple 3 will pierce the tissue and contact the surface of the forming groove 81. Under the action of the forming groove 81, the staple legs of the staple 3 bend towards the staple beam 31 and are closed and formed. Figure 9 The structure of the cartridge body 1 cooperating with the staple 3 during the second stroke is shown. As Figure 9 shown, after the first stroke is completed, the staple driver 4 continues to drive the corresponding staple 3 to move into the second stroke. The proximal staple leg 322 of the staple 3 is constrained between the proximal side wall of the staple hole 12 and the proximal side wall of the first protrusion 2. Through the restraining action of the first protrusion 2, the proximal staple leg 322 is maintained in the restraining space between the first protrusion 2 and the proximal side wall of the staple hole 12, avoiding the proximal staple leg 322 moving distally under the force of the tissue spreading distally, and further avoiding the forming failure of the staple 3 due to the proximal staple leg 322 not being able to align with the forming groove 81 when moving distally. Even when the tissue slips greatly, the forming effect of the staple 3 can still be ensured, thereby improving the tissue anastomosis effect.
[0048] In this embodiment, in order to better explain the restraining action of the first protrusion 2 on the proximal staple leg 322, the process of the staple driver 4 driving the staple 3 is divided into the first stroke and the second stroke. It can be understood that during the firing process of the surgical stapler, the process of the staple driver 4 driving the staple 3 to anastomose the tissue is a continuous process, that is, the first stroke and the second stroke are a continuous stroke. Among them, the first protrusion 2 only provides a restraining action on the proximal staple leg 322 after the tip of the staple 3 emerges from the cartridge face 11.
[0049] As Figure 2 、 Figure 9 and Figure 14 shown, multiple forming grooves 81 are provided on one side of the anvil 8. The multiple forming grooves 81 are aligned one by one with the multiple staple holes 12 provided on the cartridge body 1. The staple legs of the staple 3 extending from the staple holes 12 enter the corresponding forming grooves 81 and are bent and formed in the forming grooves 81. The forming groove 81 includes a proximal forming groove and a distal forming groove. The proximal staple leg 322 of the staple 3 enters the proximal forming groove from the proximal side of the proximal forming groove, and is bent and formed towards the direction of the distal forming groove under the guidance of the proximal forming groove; similarly, the distal staple leg 321 of the staple 3 enters the distal forming groove from the distal side of the distal forming groove, and is bent and formed towards the direction of the proximal forming groove under the guidance of the distal forming groove.
[0050] Continue to refer to Figure 1 、 Figure 2 、 Figure 9 andFigure 14 When the forming groove 81 is aligned with the staple hole 12, the proximal forming groove of the forming groove 81 projects onto the cartridge surface 11 and covers the first protrusion 2. Preferably, the projection has a proximal outer edge that is located outside the proximal end 122 of the staple hole 12.
[0051] In other words, the proximal end of the forming groove 81 forms a projection on the cartridge surface 11. Under the constraint of the first protrusion 2, when the staple 3 is configured to be pushed outwards, the tip of the proximal staple leg 322 of the staple 3 always lies within the projection on the cartridge surface 11, thereby ensuring that the proximal staple leg 322 of the staple 3 can be bent towards the staple beam 31 under the action of the forming groove 81 and closed, avoiding misalignment between the proximal staple leg 322 of the staple 3 and the forming groove 81, and thus improving the forming effect of the staple 3.
[0052] As Figure 1 shown, in this embodiment, the cartridge assembly 10 further includes a cartridge holder 7 that houses the cartridge body 1, and the proximal end of the cartridge holder 7 is rotatably connected to the proximal end of the anvil 8. In the present application, the axial direction is the axial direction of the stapler, that is, the extending direction of the cartridge body 1, which is denoted as the S direction in Figure 2 ; the transverse direction is the width direction, which is denoted as the W direction in Figure 2 ; the longitudinal direction is the height direction, which is denoted as the H direction in Figure 2 . "Inner side" and "outer side" are defined with respect to the axial S direction of the stapler. For each staple hole 12, the side closer to the cutter groove 13 is the inner side, and the side farther from the cutter groove 13 is the outer side. "Distal end" and "proximal end" are defined with respect to the operator of the stapler. The end farther from the operator, i.e., the end closer to the surgical site, is the distal end, and the end closer to the operator is the proximal end.
[0053] In this embodiment, there are two opposite staple hole side walls between the proximal end and the distal end of the staple hole 12. The two staple hole side walls include an outer side wall 123 that is farther from the cutter groove 13 and an inner side wall 124 that is closer to the cutter groove 13. The first protrusion 2 is provided on at least one of the outer side wall 123 and the inner side wall 124. As Figure 3 shown, in this embodiment, the first protrusion 2 is provided on the outer side wall 123. When the tissue spreads distally and laterally, the tissue exerts a force on the staple legs of the staple 3 that is distal and lateral. The distal staple leg 321 of the staple 3 is prevented from moving distally by the distal side wall of the staple hole 12, while the proximal staple leg 322 of the staple 3 is offset closer to the outer side of the staple hole 12 and is prevented from moving distally by the first protrusion 2. In other alternative embodiments, the first protrusion 2 may also be provided on the inner side wall 124, or the first protrusion 2 may be provided on both the outer side wall 123 and the inner side wall 124 to accommodate the offset of the proximal staple leg 322 of the staple 3 in different directions.
[0054] As shown Figures 3-5 in the figure, the first convex part 2 is a long strip convex part. The first convex part 2 has a vertical side wall 21 facing the inside of the staple hole 12. Among them, the vertical side wall 21 is parallel to the outer side wall 123. The horizontal distance between the vertical side wall 21 of the first convex part 2 and the outer side wall 123 where the first convex part 2 is arranged is the horizontal width (thickness) of the first convex part 2. The first convex part 2 further includes a connecting plane 22. The connecting plane 22 is flush with or higher than the staple cartridge surface 11, so as to provide a continuous restraining effect on the proximal staple legs 322 of the staple 3 during the firing process of the stapler. The first convex part 2 continuously extends from one side of the staple hole 12 close to the staple cartridge surface 11 to the other side of the staple hole 12 far from the staple cartridge surface 11, so that the proximal staple legs 322 of the staple 3 still in the staple hole 12 during the firing process of the stapler can also be restricted by the first convex part 2. In other alternative embodiments, the first convex part 2 can also be other deformed structures; for example, in some embodiments, the first convex part 2 adopts other shapes, such as wedge-shaped, semi-cylindrical, etc.; in other embodiments, the vertical side wall 21 is inclined relative to the outer side wall 123; in still other embodiments, one end of the first convex part 2 communicates with one side of the staple hole 12 close to the staple cartridge surface 11, and the other end does not communicate with the side of the staple far from the staple cartridge surface 11, that is, the longitudinal height of the first convex part 2 is less than the longitudinal height of the staple hole 12; various deformed structures of the first convex part 2 are within the protection scope of this application.
[0055] As shown Figures 6-8 in the figure, the staple 3 includes a staple beam 31, a distal staple leg 321 connected to the distal end of the staple beam 31, and a proximal staple leg 322 connected to the proximal end of the staple beam 31. The staple driver 4 supports the staple beam 31 of the staple 3. In this embodiment, when the first convex part 2 is arranged on the outer side wall 123, the horizontal distance between the vertical side wall 21 of the first convex part 2 and the outer side wall 123 is greater than or equal to the staple leg radius of the staple 3, so as to ensure that the first convex part 2 can provide a good restraining effect on the staple 3 and prevent the proximal staple legs 322 of the staple 3 from moving distally beyond the first convex part 2 under the action of the tissue. When the first convex part 2 is arranged on the inner side wall 124, the horizontal distance between the vertical side wall 21 of the first convex part 2 and the inner side wall 124 is greater than or equal to half of the staple leg diameter of the staple 3. That is, in the W direction, the thickness of the first convex part 2 is greater than or equal to half of the diameter of the proximal staple legs 322 of the staple 3.
[0056] As shown Figures 6-8As shown, an avoidance portion 41 is provided at the proximal end of each staple driver 4. When the staple driver 4 continues to drive the corresponding staple 3 to move into the second stroke, the avoidance portion 41 is aligned with the first convex portion 2 so that the avoidance portion 41 moves along the first convex portion 2. In this embodiment, the avoidance portion 41 is a concave portion adapted to the shape of the first convex portion 2. In this embodiment, when the staple 3 and the staple driver 4 are in the initial position, the avoidance portion 41 is aligned with the first convex portion 2. Among them, during the first stroke and the second stroke, the avoidance portion 41 always moves along the first convex portion 2. By providing the avoidance portion 41, on the one hand, interference between the staple driver 4 and the first convex portion 2 can be avoided, and on the other hand, the cooperation between the avoidance portion 41 and the first convex portion 2 can provide guidance for the longitudinal movement of the staple driver 4, further ensuring that the proximal staple legs 322 of the staple 3 can be constrained between the proximal side wall of the first convex portion 2 and the proximal side wall of the staple hole 12.
[0057] Continuing to refer to Figures 10-12 , in the staple cartridge assembly 10, the displacement limiting structure further includes: a second convex portion 5, which protrudes on the staple cartridge surface 11, and the second convex portion 5 is arranged near the top of the outer side wall 123, and the outer side wall 123 is used to constrain the displacement of the proximal staple legs 322 toward the outside of the jaw during the second stroke.
[0058] As Figure 10 shown, the second convex portion 5 and the tissue anti-slip structure 100 provided around the proximal end 122 of the staple hole 12 are connected to each other, but not limited thereto. In other embodiments of the present application, it may also be that only the second convex portion 5 is provided, and the proximal side wall of the second convex portion 5 extends as far as possible and is close to the proximal end 122 of the staple hole 12 to prevent the displacement of the proximal staple legs 322 toward the outside of the jaw.
[0059] As Figure 9 and Figure 10 shown, the portion of the second convex portion 5 facing the inner side wall 124 extends toward the inside of the staple hole 12 and is connected to the first convex portion 2, or the connecting plane 22 of the first convex portion 2 extends upward and is higher than the staple cartridge surface 11 and then is connected to the second convex portion 5 of the outer side wall near the staple hole 12. Among them, the connection process between the first convex portion 2 and the second convex portion 5 includes an integral molding process. In other alternative embodiments, the second convex portion 5 may also be separately formed from the first convex portion 2, and the second convex portion 5 is connected to or spaced from the first convex portion 2.
[0060] Continuing to refer to Figure 9 and Figure 10 , the first convex portion 2, the second convex portion 5 and the tissue anti-slip structure 100 at the proximal end 122 of the staple hole 12 together form a receiving cavity, and the proximal staple legs 322 are received in this receiving cavity, and this receiving cavity is used to constrain the displacement of the proximal staple legs 322 toward the distal end and the outside of the jaw 9.
[0061] In this embodiment, the structure between the first protrusion 2 and the second protrusion 5 is generally an L-shaped structure.
[0062] In this embodiment, by providing the first protrusion 2, when clamping tissue in the jaw 9, after the proximal staple legs 322 of the staple 3 are exposed from the staple hole 12, the first protrusion 2 can well stop the proximal staple legs 322 of the staple 3 from moving distally. At the same time, by providing the second protrusion 5, the second protrusion 5 can stop the movement of the proximal staple legs 322 of the staple 3 towards the outside of the jaw 9 (in the W direction), and keep the proximal staple legs 322 of the staple 3 between the proximal side wall of the first protrusion 2, the second protrusion 5 and the proximal side wall of the staple hole 12 all the time.
[0063] As Figure 11 and Figure 12 shown, in this embodiment, the first protrusion 2 is elongated, its vertical side wall 21 is parallel to the outer side wall 123, and in a cross-section perpendicular to the axial direction, the cross-section of the first protrusion 2 is rectangular.
[0064] Figure 13 shows the structure of the cartridge assembly 10 of another embodiment of the present application. The difference between this embodiment and the foregoing embodiment is that the first protrusion 2 is a wedge-shaped protrusion. As Figure 13 shown, the vertical side wall 21 is arranged obliquely relative to the outer side wall 123, wherein the lower end of the vertical side wall 21 is connected to the outer side wall 123, and the upper end of the vertical side wall 21 is connected to the cartridge surface 11 through a connecting plane 22, so that an acute angle is formed between the vertical side wall 21 and the outer side wall 123. In the W direction, the maximum thickness of the first protrusion 2 is greater than or equal to half of the diameter of the proximal staple legs 322 of the staple 3. In the longitudinal direction, the lateral distance between the vertical side wall 21 and the outer side wall 123 where the first protrusion 2 is provided gradually increases from the side far from the cartridge surface 11 to the side close to the cartridge surface 11, that is, the thickness of the first protrusion 2 gradually increases from the side far from the cartridge surface 11 to the side close to the cartridge surface 11.
[0065] After the staple 3 is driven by the staple driver 4 and exposed from the staple hole 12, the greater the distance between the tip of the staple legs of the staple 3 and the cartridge surface 11, the greater the force exerted on the staple 3 by the tissue, and the greater the lateral width of the surface where the first protrusion 2 cooperates with the staple 3, providing a more stable constraint and stopping effect for the staple 3.
[0066] The above embodiments are described by taking the displacement limiting structure including the first convex part and the second convex part as an example. In a variant embodiment, the displacement limiting structure may only include the above-mentioned first convex part. When the staple driver drives the corresponding staple to move into the second stroke, the first convex part stops the movement of the proximal staple leg of the staple towards the distal end. In another variant embodiment, the displacement limiting structure may only include the above-mentioned second convex part. When the staple driver drives the corresponding staple to move into the second stroke, the second convex part stops the outward expansion of the part of the proximal staple leg of the staple exposed from the staple hole. All kinds of variant embodiments fall within the protection scope of the present invention.
[0067] The structures of the above various embodiments can also be combined to obtain a new structure of the staple cartridge assembly 10. For example, the vertical side wall 21 of the first convex part 2 in the embodiment is set to be inclined relative to the outer side wall 123. Another example is to change the shape of the first convex part 2 in a certain above-mentioned embodiment so that its cross-section in the cross-section perpendicular to the axial direction is trapezoidal or other polygons. The deformed structures of various combinations also fall within the protection scope of the present application. Figures 1-9 In summary, the staple cartridge assembly and the surgical stapler provided by the present application have the following advantages:
[0068] The present application restricts the proximal staple leg of the staple when the stapler is fired by arranging a displacement limiting structure in the staple hole. When the staple driver drives the corresponding staple to move into the second stroke, the proximal staple leg of the staple is restricted between the proximal side wall of the staple hole and the proximal side wall of the first convex part, and / or the displacement of the part of the proximal staple leg of the staple exposed from the staple hole expanding outward is stopped by the second convex part, avoiding the forming failure due to the movement of the proximal staple leg of the staple towards the distal end and outside the jaw, improving the forming effect of the staple, and further improving the tissue anastomosis effect.
[0069]
[0070] The above content is a further detailed description of the present application in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application belongs, without departing from the concept of the present application, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present application.
Claims
1. A staple cartridge assembly for a surgical stapler, characterized in that, The cartridge assembly includes: A cartridge body, including a cartridge surface and a cutter groove, the cartridge body being provided with a plurality of staple holes communicating with the cartridge surface, each of the staple holes including an opposite distal end and a proximal end, and the plurality of staple holes being arranged in an array on both sides of the cutter groove; A displacement limiting structure, which is disposed near the proximal end of the staple hole, and the displacement limiting structure includes: A first protrusion, which is disposed inside the staple hole and extends toward the center of the staple hole; and / or A second protrusion, which protrudes on the cartridge surface and is located on one side of the outer side wall of the staple hole, and the outer side wall is away from the cutter groove; A plurality of staples, which are movably disposed in the corresponding staple holes; and A plurality of staple drivers, which are movably disposed in the corresponding staple holes, and each of the staple drivers receives and drives the corresponding staple; Wherein, after the staple driver drives the corresponding staple to move a first stroke, the tip of the staple protrudes from the staple hole, and the staple driver continues to drive the corresponding staple to move into a second stroke; during the second stroke, the proximal leg of the staple is constrained between the proximal side wall of the staple hole and the proximal side wall of the first protrusion, and / or, the displacement of the part of the proximal leg of the staple protruding from the staple hole expanding outward is blocked by the second protrusion.
2. The cartridge assembly according to claim 1, wherein, Each proximal end of the staple drivers is provided with an avoidance portion. When the staple driver continues to drive the corresponding staple to move into the second stroke, the avoidance portion is aligned with the first protrusion so that the avoidance portion moves along the first protrusion.
3. The cartridge assembly according to claim 2, wherein, When the staple and the staple driver are in the initial position, the avoidance portion is aligned with the first protrusion, wherein, during the first stroke and the second stroke, the avoidance portion always moves along the first protrusion.
4. The staple cartridge assembly according to claim 2 or 3, characterized in that The first protrusion continuously extends from the side of the staple hole close to the cartridge surface to the side of the staple hole away from the cartridge surface.
5. The staple cartridge assembly according to claim 2 or 3, characterized in that, The first protrusion is a long strip protrusion or a wedge-shaped protrusion.
6. The cartridge assembly according to claim 2, wherein, The first protrusion has a vertical side wall, the vertical side wall is parallel to the outer side wall, or the vertical side wall is inclined relative to the outer side wall.
7. The cartridge assembly according to claim 6, wherein The first protrusion further includes a connecting plane, and the connecting plane is flush with or higher than the cartridge surface.
8. The staple cartridge assembly according to claim 7, wherein, When the vertical side wall is inclined relative to the outer side wall, the lower end of the vertical side wall is connected to the outer side wall, and the upper end of the vertical side wall is connected to the cartridge surface through the connecting plane, so that an acute angle is formed between the vertical side wall and the outer side wall.
9. The staple cartridge assembly according to claim 1, wherein, The displacement limiting structure includes the first protrusion and the second protrusion, wherein the second protrusion extends toward the inside of the staple hole and is connected to the first protrusion.
10. The cartridge assembly according to claim 9, wherein, The first protrusion and the second protrusion are integrally formed.
11. The staple cartridge assembly according to claim 1, wherein, The thickness of the first protrusion protruding from the outer side wall toward the inside of the staple hole is half of the diameter of the proximal leg.
12. A surgical stapler, characterized in that, Including the cartridge assembly according to any one of claims 1 to 11.