Staple drivers, staple driving systems, staple cartridges, and surgical staplers

Abstract

The application provides a staple driver, a staple driving system, a staple cartridge and a surgical stapler. The staple driver comprises: an outer driving part for driving outer-row staples in the surgical stapler; and a middle driving part for driving middle-row staples in the surgical stapler, wherein the middle-row staples are located on the inner side of the outer-row staples and close to a knife groove of a staple cartridge in the surgical stapler. When the forming height of the outer-row staples is equal to the forming height of the middle-row staples, the height of the outer driving part is increased so that the height of the outer driving part is greater than or equal to the height of the middle driving part. When the forming height of the outer-row staples is greater than the forming height of the middle-row staples, the height of the outer driving part is increased so that the height of the outer driving part is less than or equal to the height of the middle driving part. The application is beneficial to improving the forming effect of the outer-row staples and improving the strength and stability of the outer driving part.

Description

Technical Field

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

[0002] Surgical staplers generally consist of an instrument body and an end effector. The end effector includes a staple cartridge assembly and an anvil, which are positioned opposite each other. The staple cartridge assembly contains staples and corresponding staple drivers. When the stapler is fired, the staples are driven upward by the staple drivers and close in place after contacting the staple forming groove of the anvil. Whether the final closing height of the staples reaches the preset target value has a critical impact on the quality of the anastomosis, and this closing height is constrained by the height parameters of the staple drivers, the staple height, and other factors.

[0003] In existing unequal-height anastomosis techniques, the target forming height of multiple rows of anastomotic staples on each side of the staple cartridge slot along the transverse direction increases sequentially from the inside to the outside. Correspondingly, the height of the staples themselves also increases progressively from the inside to the outside. To achieve this gradient increase in staple height from the inside to the outside, the height of the driving section on the staple actuator gradually decreases from the inside to the outside. However, with the trend towards minimally invasive surgery, the diameter of the end effector has evolved from the traditional 12mm to 10mm, 8mm, and 5mm. When the overall diameter of the end effector is reduced to no more than 10mm, the size of the staple cartridge and staple actuator is significantly reduced due to the size constraints of this trend, especially the vertical height of each driving section of the staple actuator.

[0004] Among them, the reduction in the vertical height of each driving part has the most significant impact on the outermost driving part, specifically manifested as follows: (1) The overall height of the outer driving part is reduced, and when it moves longitudinally in the outer nail hole, it is easy to wobble and cannot support the outer nail forming well, resulting in the outer nail not closing firmly due to the high preset closing forming height; (2) The overall height of the outer driving part is reduced, and the contact area between it and the connecting part between the outer driving part and the middle driving part becomes smaller. The outer driving part supports the outer nail forming process, and the outer driving part is prone to deformation or detachment relative to the connecting part with the middle driving part, affecting the outer nail forming effect. Utility Model Content

[0005] In view of the problems in the prior art, the purpose of this application is to provide a staple driver, a staple driving system, a staple cartridge and a surgical stapler to improve the lateral staple formation effect and improve the strength and stability of the lateral driving part.

[0006] A first aspect of this application provides a staple driving assembly for driving a plurality of staples in a surgical stapler, the staple driver comprising:

[0007] The outer drive unit is used to drive the outer row of staples in the surgical stapler;

[0008] The intermediate drive unit is used to drive the intermediate row of staples in the surgical stapler. The intermediate row of staples is located inside the outer row of staples and close to the feed groove of the staple cartridge in the surgical stapler.

[0009] Specifically, when the forming height of the outer row of nails is equal to the forming height of the middle row of nails, the height of the outer driving part is increased so that the height of the outer driving part is greater than or equal to the height of the middle driving part; when the forming height of the outer row of nails is greater than the forming height of the middle row of nails, the height of the outer driving part is increased so that the height of the outer driving part is less than or equal to the height of the middle driving part.

[0010] In some embodiments, when the forming height of the outer row of nails is greater than or equal to the forming height of the middle row of nails, the height difference between the height of the outer drive portion and the height of the middle drive portion is 0.1 ± 0.03 mm.

[0011] In some embodiments, an inner drive portion is also included for driving the inner row of staples in the surgical stapler;

[0012] The forming height of the inner row of nails is less than that of the middle row of nails, and the height of the inner drive section is greater than that of the middle drive section.

[0013] In some embodiments, at least two of the inner drive portion, the middle drive portion, and the outer drive portion are spaced apart axially.

[0014] In some embodiments, the inner driving portion and the middle driving portion are spaced apart in the axial direction, the outer driving portion and the middle driving portion are spaced apart in the axial direction, and the inner driving portion and the outer driving portion are symmetrically arranged on both sides of the middle driving portion in the lateral direction.

[0015] In some embodiments, the top of the inner driving part is provided with a first pin placement groove, the top of the middle driving part is provided with a second pin placement groove, and the bottom of the first pin placement groove and the second pin placement groove are respectively provided with a recess.

[0016] In some embodiments, the top of the outer drive portion is provided with a third pin placement groove, which is a continuous structure along the axial direction.

[0017] In some embodiments, the outer drive portion includes an outer sidewall and an inner sidewall that are laterally opposed, and the bottom of the outer sidewall and the inner sidewall are provided with a ramped connecting surface that slopes from the outer sidewall toward the inner sidewall.

[0018] A second aspect of this application provides a staple driving system for driving a plurality of staples in a surgical stapler, the staple driving system comprising:

[0019] The first nail driver, the first nail driver being a nail driver of a first aspect; and

[0020] The second nail driver is used to drive two nails located at the proximal end of the nail magazine in the surgical stapler, the two nails including an inner row of nails and an intermediate row of nails.

[0021] In some embodiments, the nail height of the outer row of nails is the same as that of the middle row of nails.

[0022] A third aspect of this application provides a staple cartridge for a small-diameter laparoscopic surgical stapler, the staple cartridge including the staple driving system of the second aspect.

[0023] In some embodiments, the pinning reservoir includes:

[0024] The staple cartridge body and the slot divide the staple cartridge body into two staple forming areas. Along the direction gradually away from the slot, each staple forming area sequentially includes a first tissue contact surface, a second tissue contact surface and a third tissue contact surface. The second tissue contact surface is lower than the first tissue contact surface and higher than the third tissue contact surface.

[0025] Among them, the first tissue contact surface, the second tissue contact surface and the third tissue contact surface form a continuous high and low arc surface.

[0026] The fourth aspect of this application provides a small-diameter laparoscopic surgical stapler, including the staple cartridge of the third aspect.

[0027] The staple driver, staple driving system, staple cartridge, and surgical stapler provided in this application have the following advantages:

[0028] In the staple actuator design of this application, when the forming height of the outer row of staples is equal to the forming height of the middle row of staples, the height of the outer driving part is increased so that the height of the outer driving part is greater than or equal to the height of the middle driving part. When the forming height of the outer row of staples is greater than the forming height of the middle row of staples, the height of the outer driving part is increased so that the height of the outer driving part is less than or equal to the height of the middle driving part. By adopting the staple actuator design of this application, the swaying of the outer driving part during longitudinal movement in the outer staple hole is avoided, thereby preventing the outer staple forming height from being too high and resulting in insecure closure, improving the outer staple forming effect. Furthermore, the increased height of the outer driving part has higher strength and stability, preventing the outer driving part from deforming or detaching relative to the connecting part when the stapler is fired. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the structure of a staple cartridge according to an embodiment of this application;

[0031] Figure 2 This is an exploded view of the staple cartridge according to an embodiment of this application;

[0032] Figure 3 This is a top view of a staple cartridge according to an embodiment of this application;

[0033] Figure 4 yes Figure 3 Enlarged view of region A in the middle;

[0034] Figure 5 yes Figure 3 Cross-sectional view along the BB direction;

[0035] Figure 6 This is a schematic diagram of the structure of a first nail driver according to an embodiment of this application;

[0036] Figure 7 This is a side view of a first nail driver according to an embodiment of this application;

[0037] Figure 8 This is a schematic diagram of the structure of a second nail driver according to an embodiment of this application;

[0038] Figure 9 This is a side view of a second nail driver according to an embodiment of this application.

[0039] Figure label:

[0040] 10-Stabbing cartridge; 1-Stabbing cartridge body; 13-Stabbing area; 141-Inner staple hole; 142-Middle staple hole; 143-Outer staple hole; 2-Slot;

[0041] 3-Firing mechanism; 6-Stick cartridge frame;

[0042] 4-First nail driver; 41-Inner driving part; 411-First nail placement groove; 412-First recessed part; 42-Middle driving part; 421-Second nail placement groove; 422-Second recessed part; 43-Outer driving part; 431-Third nail placement groove; 432-Sloping connecting surface; 44-First connecting part; 45-Second connecting part;

[0043] 5-Second nail driver; 51-Inner row drive unit; 52-Middle row drive unit; 53-Third connecting unit. Detailed Implementation

[0044] 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.

[0045] This application provides a staple driver, a staple driving system including the staple driver, a staple cartridge including the staple driving system, and a surgical stapler. The surgical stapler includes an instrument body and an end effector, the end effector including a staple cartridge and an anvil disposed opposite each other. The staple driver is used to drive multiple staples in the surgical stapler. Optionally, this application is applicable to surgical staplers with an end effector diameter ≤10mm, which can improve staple formation effect and structural stability.

[0046] Figures 1-5 The structure of a staple cartridge according to an embodiment of this application is shown. Figure 6 and Figure 7 The structure of the first nail driver in this embodiment is shown. (As follows) Figures 1-7 As shown, the first staple driver 4 includes an outer driving section 43 and a middle driving section 42. The outer driving section 43 is used to drive the outer row of staples in the surgical stapler. The middle driving section 42 is used to drive the middle row of staples in the surgical stapler. The middle row of staples is located inside the outer row of staples and close to the feed groove of the staple cartridge 10 of the surgical stapler.

[0047] In this embodiment, when the forming height of the outer row of nails is equal to the forming height of the middle row of nails, the height of the outer driving part 43 is increased, making the height of the outer driving part 43 greater than or equal to the height of the middle driving part 42. When the forming height of the outer row of nails is greater than the forming height of the middle row of nails, the height of the outer driving part 43 is increased, making the height of the outer driving part 43 less than or equal to the height of the middle driving part 42, to meet the forming requirement of a large forming height for the outer row of nails. Figure 7As shown in this application, the height h1 of the intermediate drive part 42 refers to the distance from the highest point of the intermediate drive part 42 in the longitudinal direction to the lowest point of the bottom surface of the first nail driver 4, and the height h2 of the outer drive part 43 refers to the distance from the highest point of the outer drive part 43 in the longitudinal direction to the lowest point of the bottom surface of the first nail driver 4. By adopting the nail driver design of this application, the outer drive part 43 is prevented from swaying when moving longitudinally in the outer nail hole 143, thereby avoiding excessive outer nail forming height and insecure closure, improving the outer nail forming effect, and the increased height of the outer drive part 43 has higher strength and stability, preventing the outer drive part 43 from deforming or detaching relative to the connecting part when the stapler is fired.

[0048] Optionally, when the forming height of the outer row of nails is greater than or equal to the forming height of the middle row of nails, the height difference between the height of the outer driving part 43 and the height of the middle driving part 42 is 0.1 ± 0.03 mm. It is understood that when the forming height of the outer row of nails is greater than the forming height of the middle row of nails, even if the height of the outer driving part is less than the height of the middle driving part, the design height of the outer driving part 43 in this application is still greater than the design height of the outer driving part in the prior art. Specifically, the height difference between the outer driving part 43 and the middle driving part 42 is maintained at 0.1 ± 0.03 mm or 0.2 ± 0.025 mm.

[0049] In a preferred embodiment, the height of the outer drive unit 43 is equal to the height of the middle drive unit 42, the height of the middle drive unit 42 is less than the height of the inner drive unit 41, and the height of the outer row of nails is equal to the height of the middle row of nails, while the height of the middle row of nails is greater than the height of the inner row of nails. This preferred embodiment is an optimization of existing unequal height matching schemes, particularly optimizing existing unequal height matching schemes for small-diameter (≤10mm) end effector assemblies, maintaining the strength of the outer row of nail drivers while achieving stable unequal height stitching.

[0050] The staple driving assembly of this application can be optionally applied to surgical staplers employing unequal-height anastomosis techniques, wherein at least two of the inner row of staples, the middle row of staples, and the outer row of staples have different forming heights. For example, the forming heights of the inner row of staples, the middle row of staples, and the outer row of staples increase sequentially; or, the forming heights of the inner row of staples and the middle row of staples are different, while the forming heights of the middle row of staples and the outer row of staples are the same; or, the forming heights of the inner row of staples and the middle row of staples are the same, while the forming heights of the middle row of staples and the outer row of staples are different. In this embodiment, the forming height of the inner row of staples is less than the forming height of the middle row of staples, and the forming height of the middle row of staples is less than or equal to the forming height of the outer row of staples.

[0051] Figure 8 and Figure 9The structure of the second nail driver of this application is shown. In this embodiment, the second nail driver 5 includes an inner row driving part 51 for driving the inner row of nails and an intermediate row driving part 52 for driving the intermediate row of nails. The inner row driving part 51 and the intermediate row driving part 52 are connected by a third connecting part 53. The second nail driver 5 is used to drive two nails located at the nearest end of the nail cartridge body 1 in the surgical stapler, the two nails including an inner row of nails and an outer row of nails. Optionally, the height of the inner row driving part 51 is greater than the height of the intermediate row driving part 52, but this application is not limited thereto.

[0052] like Figures 1-5 As shown, the staple cartridge 10 includes the first staple driver 4 and the second staple driver 5 described above. The staple cartridge 10 also includes a staple cartridge body 1 and a slot 2. The slot 2 provides a passage for the cutter to pass through. The slot 2 divides the body into two spaced staple forming areas 13. Along a direction gradually moving away from the slot 2, each staple forming area 13 sequentially includes an inner staple hole 141, a middle staple hole 142, and an outer staple hole 143 from the inside to the outside. The plurality of staples includes an inner row of staples movably disposed in the inner staple hole 141, a middle row of staples movably disposed in the middle staple hole 142, and an outer row of staples movably disposed in the outer staple hole 143. The first staple driver 4 also includes an inner driving part 41 for driving the inner row of staples, a middle driving part 42 for driving the middle row of staples, and an outer driving part 43 for driving the outer row of staples.

[0053] like Figure 1 As shown, in this embodiment, the staple cartridge 10 further includes a staple cartridge frame 6 that houses the staple cartridge body 1, the proximal end of which is rotatably connected to the anvil of the surgical stapler. Figure 2 As shown, the staple cartridge 10 also includes a firing structure 3 for cooperating with the first staple driver 4 and the second staple driver 5 to push the inner row drive section 51 and the middle row drive section 52 of the second staple driver 5 upward, and to push the inner drive section 41, the middle drive section 42 and the outer drive section 43 of the first staple driver 4 upward.

[0054] In this application, axial direction refers to the extending direction of the staple cartridge body 1, that is... Figure 3 The left and right directions are defined as follows: the left end of the staple cartridge body 1 is the far end, furthest from the operator, and the right end is the proximal end, closest to the operator. The horizontal direction refers to the width. Figure 5 The left and right directions. Vertical direction refers to the height direction, i.e. Figure 5 The vertical direction within. For each nailing area 13, its inner and outer sides are relative to the slot 2, with the side closer to the slot 2 being the inner side and the side farther from the slot 2 being the outer side.

[0055] In this embodiment, the upper surface of the staple region 13 is a tissue contact surface. Along the direction gradually moving away from the slot 2, each staple region 13 sequentially includes a first tissue contact surface, a second tissue contact surface, and a third tissue contact surface from the inside to the outside. Optionally, the second tissue contact surface is lower than the first tissue contact surface but higher than the third tissue contact surface. The height of the tissue contact surface of the staple region 13 gradually decreases from the inside to the outside, and the first tissue contact surface, the second tissue contact surface, and the third tissue contact surface form a continuous high and low arc surface.

[0056] Figures 3-5 In order to exemplify two different states of the first nail driver 4, the states of the first nail driver 4 in the nail-forming area 13 on the first side and the nail-forming area 13 on the second side of the slot 2 are different, wherein, Figure 5 The first pin driver 4 on the left is in the state when it is not driven by the firing structure 3, while the first pin driver 4 on the right is in the state when it is driven by the firing structure 3 and pushed outward. Figures 3-5 The examples shown are for illustrative purposes only and do not represent actual working states. In practical applications, during the firing process of the stapler, under the synchronous driving action of the firing structure 3, the first staple drivers 4, which are symmetrically arranged with respect to the slot 2 in the staple forming areas 13 on both sides, are in the same state at the same time.

[0057] exist Figure 5 In the diagram, the first nail driver 4 on the left is in the first position, and the first nail driver 4 on the right is in the second position. Initially, the first nail driver 4 is in the first position. During the firing of the stapler, the firing structure 3 pushes the first nail driver 4 upward, and the first nail driver 4 reaches the second position. The second position is located above the first position. During the movement from the first position to the second position, the first nail driver 4 pushes the corresponding nail outward.

[0058] like Figures 3-5 As shown, the inner drive portion 41, the middle drive portion 42, and the outer drive portion 43 are spaced apart laterally. At least two of the inner drive portion 41, the middle drive portion 42, and the outer drive portion 43 are spaced apart axially, such as the inner drive portion 41 and the middle drive portion 42 being spaced apart axially, and / or the outer drive portion 43 and the middle drive portion 42 being spaced apart axially. In this embodiment, the inner drive portion 41 and the middle drive portion 42 are spaced apart axially, the outer drive portion 43 and the middle drive portion 42 are spaced apart axially, and the inner drive portion 41 and the outer drive portion 43 are symmetrically arranged on both sides of the middle drive portion 42 laterally. However, this application is not limited to this; for example, in another optional embodiment, the inner drive portion 41, the middle drive portion 42, and the outer drive portion 43 may all be spaced apart axially.

[0059] Figure 6 and Figure 7The structure of the first nail driver 4 in this embodiment is shown. In this embodiment, the first nail driver 4 further includes a first connecting portion 44 and a second connecting portion 45. The first connecting portion 44 is connected between the inner driving portion 41 and the middle driving portion 42, and the second connecting portion 45 is connected between the middle driving portion 42 and the outer driving portion 43. Figure 6 In the illustrated embodiment, the forming height of the outer row of staples is equal to the forming height of the middle row of staples, and the height h2 of the outer driving part 43 is greater than or equal to the height h1 of the middle driving part 42. By increasing the height h2 of the outer driving part 43, the overall strength of the outer driving part 43 is enhanced, and deformation and detachment of the outer driving part 43 relative to the second connecting part 45 are effectively prevented when the stapler is fired. Optionally, the forming height of the inner row of staples is less than the forming height of the middle row of staples, and the height of the inner driving part 41 is greater than the height of the middle driving part 42, but this application is not limited thereto.

[0060] like Figure 7 As shown, the outer drive unit 43 includes an outer sidewall and an inner sidewall that are laterally opposed. The bottom of the outer and inner sidewalls are provided with a ramped connecting surface 432, which slopes from the outer sidewall toward the inner sidewall. When the diameter of the end effector is ≤10mm, after placing the first nail driver 4 in the nail cartridge body 1, it is necessary to lower the first nail driver 4 to the lowest possible position. By providing the ramped connecting surface 432, the outer bottom of the first nail driver 4 can be prevented from protruding beyond the nail cartridge body 1.

[0061] like Figure 6 As shown, the top of the inner drive unit 41 is provided with a first pin placement groove 411, and the top of the middle drive unit 42 is provided with a second pin placement groove 421. By providing the first pin placement groove 411 and the second pin placement groove 421, the position of the inner row of pins and the middle row of pins in the pin cartridge body 1 can be provided with lateral constraint, avoiding lateral displacement when the inner row of pins and the middle row of pins are pushed outward. The bottom of the first pin placement groove is provided with a first recess 412, and the bottom of the second pin placement groove 421 is provided with a second recess 422. When the inner row of pins and the middle row of pins are closed and formed, when their pin feet bend downward and reverse back under the action of the forming groove of the anvil, the first recess 412 can provide clearance space for the reverse-backwarded pin feet of the inner row of pins, and the second recess 422 can provide clearance space for the reverse-backwarded pin feet of the middle row of pins, thereby preventing the pin feet of the inner row of pins and the middle row of pins from getting stuck in the first pin driver 4, so that the pins can be pushed out more smoothly.

[0062] like Figure 7As shown, the top of the outer drive unit 43 is provided with a third pin placement groove 431. By providing the third pin placement groove 431, the position of the outer pins in the pin magazine body 1 can be laterally constrained, preventing lateral displacement when the outer pins are pushed outward. The third pin placement groove 431 does not have a recess, meaning it is a continuous structure along the axial direction. The bottom of the third pin placement groove 431 is also a continuous structure along the axial direction to avoid reducing structural strength due to recesses, thus making the outer drive unit 43 more structurally stable.

[0063] In summary, the staple driver, staple driving system, staple cartridge, and surgical stapler provided in this application have the following advantages:

[0064] In the staple actuator design of this application, when the forming height of the outer row of staples is equal to the forming height of the middle row of staples, the height of the outer driving part is increased so that the height of the outer driving part is greater than or equal to the height of the middle driving part. When the forming height of the outer row of staples is greater than the forming height of the middle row of staples, the height of the outer driving part is increased so that the height of the outer driving part is less than or equal to the height of the middle driving part. By adopting the staple actuator design of this application, the swaying of the outer driving part during longitudinal movement in the outer staple hole is avoided, thereby preventing the outer staple forming height from being too high and resulting in insecure closure, improving the outer staple forming effect. Furthermore, the increased height of the outer driving part has higher strength and stability, preventing the outer driving part from deforming or detaching relative to the connecting part when the stapler is fired.

[0065] 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 driver for driving a plurality of staples in a surgical stapler, characterized in that, The pin driver includes: An outer drive unit is used to drive the outer row of staples in the surgical stapler; The intermediate drive unit is used to drive the intermediate row of staples in the surgical stapler. The intermediate row of staples is located inside the outer row of staples and close to the feed groove of the staple cartridge in the surgical stapler. Specifically, when the forming height of the outer row of nails is equal to the forming height of the middle row of nails, the height of the outer driving part is increased so that the height of the outer driving part is greater than or equal to the height of the middle driving part; when the forming height of the outer row of nails is greater than the forming height of the middle row of nails, the height of the outer driving part is increased so that the height of the outer driving part is less than or equal to the height of the middle driving part.

2. The nail driver according to claim 1, characterized in that, When the forming height of the outer row of nails is greater than or equal to the forming height of the middle row of nails, the height difference between the height of the outer driving part and the height of the middle driving part is 0.1 ± 0.03 mm.

3. The nail driver according to claim 1, characterized in that, It also includes an inner drive unit for driving the inner row of staples in the surgical stapler; The forming height of the inner row of nails is less than the forming height of the middle row of nails, and the height of the inner driving part is greater than the height of the middle driving part.

4. The nail driver according to claim 3, characterized in that, At least two of the inner drive section, the middle drive section, and the outer drive section are spaced apart axially.

5. The nail driver according to claim 4, characterized in that, The inner driving part and the middle driving part are spaced apart in the axial direction, the outer driving part and the middle driving part are spaced apart in the axial direction, and the inner driving part and the outer driving part are symmetrically arranged on both sides of the middle driving part in the lateral direction.

6. The nail driver according to claim 3, characterized in that, The top of the inner driving part is provided with a first pin placement groove, and the top of the middle driving part is provided with a second pin placement groove. The bottom of the first pin placement groove and the second pin placement groove are respectively provided with a recessed part.

7. The nail driver according to claim 1, characterized in that, The top of the outer drive unit is provided with a third pin placement groove, which is a continuous structure along the axial direction.

8. The nail driver according to claim 1, characterized in that, The outer drive unit includes an outer sidewall and an inner sidewall that are laterally opposed. The bottom of the outer sidewall and the inner sidewall are provided with a sloping connecting surface, which is inclined from the outer sidewall toward the inner sidewall.

9. A staple driving system for driving a plurality of staples in a surgical stapler, characterized in that, The nail driving system includes: A first pin driver, wherein the first pin driver is a pin driver as described in any one of claims 1-8; and The second nail driver is used to drive two nails located at the proximal end of the nail cartridge in the surgical stapler, the two nails comprising an inner row of nails and an intermediate row of nails.

10. The nail driving system according to claim 9, characterized in that, The height of the outer row of nails is the same as the height of the middle row of nails.

11. A staple cartridge for small-diameter laparoscopic surgical staplers, characterized in that, The staple cartridge includes the staple driving system as described in any one of claims 9 or 10.

12. The staple cartridge according to claim 11, characterized in that, The staple cartridge includes: The staple cartridge body and the slot divide the staple cartridge body into two staple forming areas. Along the direction gradually away from the slot, each staple forming area sequentially includes a first tissue contact surface, a second tissue contact surface and a third tissue contact surface. The second tissue contact surface is lower than the first tissue contact surface and higher than the third tissue contact surface. The first tissue contact surface, the second tissue contact surface, and the third tissue contact surface form a continuous high and low arc surface.

13. A small-diameter laparoscopic surgical stapler, characterized in that, Includes the staple cartridge as described in any one of claims 11 or 12.

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