staple head and medical stapler

Abstract

This invention provides a staple head and a medical stapler. The staple head includes a first clamp, a closing firing assembly, and a connecting limiting member. The connecting limiting member includes a limiting portion and a first fixing portion. The first fixing portion is fixed to the proximal side of the first clamp, and the limiting portion is at least partially located inside the first clamp, extending axially from the first fixing portion towards the distal side of the stapler. The connecting limiting member provides a limiting channel, and the closing firing assembly at least partially enters the limiting channel, with the limiting portion restricting the lateral movement of the closing firing assembly. This invention restricts the lateral movement of the closing firing assembly through the connecting limiting member, preventing excessive deformation of the closing firing assembly, and is simple and effective in structure.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a staple head and a medical stapler. Background Technology

[0002] A medical stapler generally includes a stapler body and a staple head. A staple cartridge housing is located at the distal end of the stapler body, and the staple head is mounted at the distal end of the staple cartridge housing. A firing lever extending axially along the staple cartridge housing is disposed inside the staple cartridge housing, with its distal end extending into the staple head. When the stapler is fired, the firing lever is driven by a firing handle located on the stapler body to move towards the distal end of the stapler. Under the drive of the firing lever, the staple head can cut and suture the tissue.

[0003] In existing technology, to achieve more operating angles, the nail head can be configured to swing relative to the nail cartridge housing. When the nail head swings, it causes the firing rod to swing as well, thus causing the firing rod to bend. However, the amount of bending deformation of the firing rod is difficult to control accurately. If the firing rod undergoes excessive deformation, a greater firing force is required, which can easily lead to surgical failure.

[0004] The nail head includes a nail cartridge assembly and a nail anvil arranged opposite each other, which are controlled to close and open by a closing pin, the position of which is controlled by a closing tab. When the nail head swings relative to the nail cartridge housing, the closing tab also swings laterally, resulting in a certain degree of bending deformation. If the bending deformation of the closing tab is too large, it will affect the positional stability of the closing pin.

[0005] In this invention, the distal side and the proximal side are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical position, is the distal side. Summary of the Invention

[0006] To address the problems in the prior art, the present invention aims to provide a nail head and a medical stapler that restrict the lateral movement of the closing firing assembly by connecting limiting members, thereby preventing excessive deformation of the closing firing assembly. The structure is simple and effective.

[0007] This invention provides a staple head for a medical stapler. The staple head includes a first clamp, a closing firing assembly, and a connecting limiting member. The connecting limiting member includes a limiting part and a first fixing part. The first fixing part is fixed to the proximal side of the first clamp. The limiting part is at least partially located inside the first clamp, and the limiting part extends axially from the first fixing part toward the distal side of the stapler.

[0008] The connecting limiting member is provided with a limiting channel, the closing firing assembly at least partially enters the interior of the limiting channel, and the limiting part restricts the lateral movement of the closing firing assembly.

[0009] In some embodiments, a second fixing part is provided on the proximal side of the first clamp, the second fixing part having a hollow cavity, the first fixing part at least partially entering the hollow cavity, and the shape of the first fixing part being adapted to the shape of the second fixing part.

[0010] In some embodiments, the outer contour of the first fixing part and the inner contour of the second fixing part are non-circular cross sections, and the first fixing part and the second fixing part are tightly fitted together.

[0011] In some embodiments, the inner wall of the connecting limiter and / or the exterior of the closing firing assembly are provided with a lubrication structure.

[0012] In some embodiments, the limiting portion includes two axially extending extension arms, which are located on both sides of the closed firing assembly.

[0013] In some embodiments, a first lateral gap is formed between the inner sides of the two extension arms of the limiting portion and the outer side of the closed firing assembly.

[0014] In some embodiments, the closed firing assembly includes a closed pull tab and a firing rod, the distal end of which is provided with a cutter, and in an initial state, the cutter is at least partially located between the two extension arms of the limiting portion.

[0015] In some embodiments, the limiting portion includes a first engaging portion, and the first clamp is provided with a second engaging portion. The first engaging portion and the second engaging portion abut against each other in the longitudinal direction to restrict the limiting portion from moving longitudinally relative to the first clamp.

[0016] In some embodiments, a second clamp is further provided opposite to the first clamp, the first mating portion is located on the side of the first clamp away from the second clamp, and the side surface of the first mating portion facing the first clamp abuts against the second mating portion.

[0017] In some embodiments, the limiting portion includes a first limiting portion and a second limiting portion, the second limiting portion being connected to the first fixing portion through the first limiting portion, and a first mating portion being provided between the first limiting portion and the second limiting portion.

[0018] In some embodiments, the first clamp has a mating hole on the side opposite to the second clamp, the first limiting portion at least partially enters the mating hole, and the first mating portion is disposed on the distal side of the bottom wall of the first limiting portion.

[0019] In some embodiments, the first mating portion includes a first mating surface on the side facing the first clamp, and the second mating portion includes a second mating surface that abuts against the first mating surface;

[0020] The first clamp includes an axially extending tool groove, and two second mating surfaces are located on both sides of the tool groove.

[0021] In some embodiments, the limiting portion further includes a third mating surface, and the first clamp further includes a fourth mating surface. The third mating surface and the fourth mating surface abut against each other in the axial direction, thereby restricting the limiting portion from moving in the distal direction relative to the first clamp.

[0022] In some embodiments, the third mating surface is located at the distal end of the first limiting portion, the fourth mating surface is located on the distal inner wall of the mating hole, and the third mating surface is located on the proximal side of the fourth mating surface.

[0023] In some embodiments, the distal end of the closing pull tab is connected to the first clamp by a closing pin, the first clamp being provided with a first pin groove extending axially, the closing pin at least partially entering the first pin groove and being movable along the extending direction of the first pin groove.

[0024] The height of the highest point of the limiting part corresponding to the position area of ​​the first pin groove is less than the height of the lowest point of the closing pin.

[0025] In some embodiments, the highest point height of the limiting portion corresponding to the position area of ​​the first pin groove is less than the highest point height of the connection position area between the limiting portion and the first fixing portion.

[0026] In some embodiments, the first fixing part is fixedly connected to the proximal side of the first clamp by a connecting pin.

[0027] In some embodiments, the nail head further includes a swivel pull tab, the distal end of which is fixed to the connecting pin.

[0028] This invention also provides a medical stapler, including the aforementioned staple head.

[0029] The staple head and medical stapler provided by this invention have the following advantages:

[0030] This invention provides a staple head for a medical stapler. The staple head restricts the lateral movement of the closing firing assembly by connecting a limiting member, thereby preventing excessive deformation of the closing firing assembly. The structure is simple and effective, and can simplify the tooling process of the stapler. Attached Figure Description

[0031] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the structure of the nail head and the connecting tube in one embodiment of the present invention;

[0033] Figure 2 This is a front view of the nail head after omitting the anvil, according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of a nail head according to an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the connecting limiting member cooperating with the firing rod and the closing pull tab according to an embodiment of the present invention;

[0036] Figure 5 This is a top view of the nail head according to an embodiment of the present invention;

[0037] Figure 6 This is a bottom view of the nail head according to an embodiment of the present invention;

[0038] Figure 7 This is an exploded view of the nail head according to an embodiment of the present invention;

[0039] Figure 8 This is a perspective view of a connecting limiting member according to an embodiment of the present invention;

[0040] Figure 9 This is a front view of the connecting and limiting member in cooperation with other components according to an embodiment of the present invention;

[0041] Figure 10 This is a perspective view of the connection limiting member and the staple cartridge frame in accordance with an embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the structure of the connecting limiting member and the staple cartridge frame according to an embodiment of the present invention;

[0043] Figure 12 This is a perspective view of a connecting limiting member according to an embodiment of the present invention.

[0044] Figure label:

[0045] 1. Stamping cartridge component 511 First limit channel

[0046] 11. Staple cartridge rack with 512 mounting holes.

[0047] 111 First pin groove 52 Limiting part

[0048] 112 Second fixing part 521 First limiting part

[0049] 113 Mating Hole 522 Second Limiting Part

[0050] 114 Tool Groove 523 Third Mating Surface

[0051] 115 Second mating surface 524 Second limiting channel

[0052] 116 Fourth mating surface 525 Connection location area

[0053] 12 Cutter 529 Extender Arm

[0054] 2. Swinging head puller 53. First mating part

[0055] 3. Firing lever 531 First mating surface

[0056] 31. Firing lever distal end 6. Connecting tube

[0057] 4. Closing pull tab 71. Closing pin

[0058] 41 Distal side of the closing pull tab 72 Connecting pin

[0059] 5 Connecting limiting component 9 Anvil

[0060] 51 First fixing part 91 Second pin groove Detailed Implementation

[0061] 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, they are provided so that the invention 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.

[0062] This invention provides a staple head for a medical stapler and a medical stapler including the same. The medical stapler includes a stapler body and a staple head located at the distal end of the stapler body. The staple head includes a first clamp, a closing firing assembly, and a connecting limiting member. The connecting limiting member includes a limiting portion and a first fixing portion. The first fixing portion is fixed to the proximal end of the first clamp, and the limiting portion is at least partially located inside the first clamp, extending axially from the first fixing portion toward the distal end of the stapler. The connecting limiting member has a limiting channel, and the closing firing assembly at least partially enters the limiting channel. The limiting portion restricts the lateral movement of the closing firing assembly, preventing excessive deformation of the closing firing assembly. The structure is simple and effective, simplifying the tooling process of the stapler. In this invention, restricting the lateral movement of the closing firing assembly means limiting the lateral movement range of the closing firing assembly to a certain range. That is, when the nail head swings laterally relative to the stapler body, the closing firing assembly can swing with the nail head and produce a certain bending deformation, causing the distal end of the closing firing assembly to undergo a certain displacement in the lateral direction. However, through the limiting effect of the limiting part on the closing firing assembly, the lateral displacement will not be too large.

[0063] The structure of the nail head of various specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the various specific embodiments are not intended to limit the scope of protection of the present invention.

[0064] like Figures 1-12 As shown, one embodiment of the present invention provides a staple head and a medical stapler including the same. The medical stapler includes a stapler body (not shown) and a staple head located at the distal end of the stapler body. Figure 1 As shown, the staple head is connected to the distal end of the stapler body via a connecting tube 6 on its proximal side. The staple head includes a first clamp and a second clamp. In this embodiment, the first clamp is the staple cartridge assembly 1 and the second clamp is the anvil 9, as an example. In another alternative embodiment, the first clamp can be the anvil 9 and the second clamp can be the staple cartridge assembly 1, which can also achieve the purpose of the present invention.

[0065] In this invention, the distal and proximal sides are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, i.e., closer to the surgical position, is the distal side. The direction along the axis of the stapler is the axial direction, i.e., the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. For example, in Figure 1 From the perspective of the stapled cartridge 11, its distal side is the left side and its proximal side is the right side. Figure 1The S1 direction is the direction from the distal side to the proximal side of the stapler. (Definition) Figure 1 The direction of S1, or the direction opposite to S1, is the axial direction of the anastomosis device. (Definition) Figure 1 In the S2 direction, the longitudinal direction is defined as the height direction. Figure 4 In the S3 direction, the direction is transverse, i.e., the width direction, also referred to as the transverse direction. In this invention, for a component, the inner and outer sides are relative to the axis of the stapler; the side closer to the axis is the inner side, and the side farther from the axis is the outer side.

[0066] like Figure 1 and Figure 2 As shown, the staple cartridge assembly 1 includes a staple cartridge for receiving staples, a staple cartridge holder 11 for receiving the staple cartridge, and a cutter 12 for cutting tissue. In the initial state, the cutter 12 is located on the proximal side of the staple cartridge holder 11. The side wall of the staple cartridge holder 11 is provided with a first pin groove 111 extending axially along the stapler, and the side wall of the anvil 9 is provided with an inclined second pin groove 91. A closing pin 71 passes through both the first pin groove 111 and the second pin groove 91. By controlling the axial movement of the closing pin 71, the opening angle between the staple cartridge assembly 1 and the anvil 9 can be controlled, thus switching the staple head between a closed and open state.

[0067] like Figure 3 and Figure 4 As shown, the staple head also includes a closing firing assembly and a connecting limiting member 5. The closing firing assembly includes a firing rod 3 and a closing pull tab 4. The distal end 41 of the closing pull tab 4 is connected to the closing pin 71. The axial movement of the closing pull tab 4 can drive the axial movement of the closing pin 71 to open or close the staple head. The proximal ends of both the firing rod 3 and the closing pull tab 4 extend to the stapler body. The distal end 31 of the firing rod 3 cooperates with the cutter 12. During the firing of the stapler, the firing rod 3 moves towards the distal end of the stapler and drives the cutter 12. A second fixing part 112 is provided on the proximal side of the staple cartridge frame 11. The connecting limiting member 5 includes a limiting part 52 and a first fixing part 51. The first fixing part 51 is fixed to the proximal side of the staple cartridge frame 11. The limiting part 52 is at least partially located inside the staple cartridge 11, and the limiting part 52 extends from the first fixing part 51 toward the distal end of the stapler.

[0068] like Figure 3 As shown, the second fixing part 112 has a hollow cavity, and the first fixing part 51 at least partially enters the hollow cavity, and the shape of the first fixing part 51 is adapted to that of the second fixing part 112. Figure 4As shown, the side wall of the first fixing part 51 is provided with a mounting hole 512, which can be a through hole or a blind hole. The first fixing part 51 and the second fixing part 112 are pivotally connected by a connecting pin 72, which at least partially enters the mounting hole 512, thereby stably connecting the two together and ensuring that the first fixing part 51 will not have any displacement relative to the second fixing part 112. The proximal end face of the second fixing part 112 is flush with the proximal end face of the first fixing part 51, that is, the proximal end of the first fixing part 51 will not protrude beyond the proximal end of the second fixing part 112, and will not interfere with other components that mate with the staple cartridge frame 11. In this embodiment, the outer contour of the first fixing part 51 and the inner contour of the second fixing part 112 are non-circular cross sections to prevent the rotation of the second fixing part 112, and the first fixing part 51 and the second fixing part 112 are tightly fitted together.

[0069] like Figure 4 As shown, the first fixing part 51 defines a first limiting channel 511, and the limiting part 52 defines a second limiting channel 524. The first limiting channel 511 and the second limiting channel 524 are connected to form a limiting channel through which the firing rod 3 and the closing pull tab 4 pass. The firing rod 3 and the closing pull tab 4 at least partially enter the interior of the first limiting channel 511 and the second limiting channel 524, and the limiting part 52 restricts the lateral movement of the firing rod 3 and the closing pull tab 4. When the staple head swings laterally relative to the stapler body, the limiting part 52 restricts the lateral movement of the firing rod 3 and the closing pull tab 4, preventing the firing rod 3 and the closing pull tab 4 from moving laterally (in the lateral direction). Figure 4 Excessive displacement in the S3 direction (in the middle) avoids excessive deformation of the firing rod 3 and the closing tab 4, preventing an increase in the required firing force due to excessive deformation of the firing rod 3 and affecting the stability of the staple head closure due to excessive deformation of the closing tab 4, thus effectively maintaining the stability of the closing pin 71 position. This is beneficial for improving surgical outcomes, and the structure is simple and effective. Furthermore, the structure of the connecting limiting member 5 is simple, and its connection with the staple cartridge assembly 1 is also simple, which can simplify the tooling process of the stapler.

[0070] The two extension arms 529 of the limiting part 52 extend axially in the distal direction relative to the distal end 31 of the firing lever 3, that is, the distal ends of the two extension arms 529 of the limiting part 52 protrude distally from the distal end 31 of the firing lever 3, so that the limiting part 52 can effectively limit the distal end 31 of the firing lever 3. In the initial state, the cutter 12 is at least partially located between the two extension arms 529 of the limiting part 52 to prevent the extension arms 529 from affecting the axial movement of the cutter 12.

[0071] like Figure 5 and Figure 6 As shown, the staple head also includes a swing head pull tab 2. Two swing head pull tabs 2 are schematically shown here, located on both sides of the staple cartridge frame 11, and the distal ends of the two swing head pull tabs 2 are connected to the connecting pin 72. In other embodiments, only one swing head pull tab 2 may be provided. The proximal end of the swing head pull tab 2 extends to the stapler body. By controlling the axial movement of the swing head pull tab 2 in the stapler body, the staple head can be laterally oscillated relative to the stapler body.

[0072] like Figure 7 and Figure 8 As shown, in this embodiment, the limiting part 52 includes two extension arms 529 extending along the axial direction of the stapler, i.e., the two side walls of the limiting part 52. The two extension arms 529 are respectively located on both sides of the firing rod 3. When the distal end 31 of the firing rod 3 undergoes lateral movement, it is limited by the extension arms 529, so the distal end 31 of the firing rod 3 will not undergo excessive lateral displacement, and the firing rod 3 will not undergo excessive bending deformation, thus avoiding an increase in the required firing force due to excessive bending. Figure 7 The example shows two firing levers 3 and a closing tab 4, the closing tab 4 being located between the two firing levers 3. In other embodiments, the number of firing levers 3 and the closing tab 4 can be selected and adjusted as needed. A first lateral gap is formed between the inner sides of the two extension arms 529 of the limiting part 52 and the outer sides of the firing levers 3, that is, the lateral distance between the inner sides of the two extension arms 529 is greater than the lateral distance between the outer sides of the two firing levers 3. The lateral dimension of this first gap (the width of the first gap) can be set as needed, and is generally set to a relatively small value. By setting this first gap, overly tight contact between the inner sides of the extension arms 529 and the outer sides of the firing levers 3 is avoided, leaving some room for the firing levers 3 to move, and avoiding affecting the smoothness of the lateral swing of the nail head. Here, the first gap refers to the gap between the inner side of the two extension arms 529 and the outer side of the outermost firing lever 3. In the case of two firing levers 3, the first gap is formed between the inner side of the left extension arm 529 and the outer side of the left firing lever 3 (left side), and the first gap is formed between the inner side of the right extension arm 529 and the outer side of the right firing lever 3 (right side).

[0073] In this embodiment, the inner wall of the connecting limiting member 5 includes the inner wall of the first limiting channel 511 in the first fixing part 51 and the inner wall of the limiting part 52 that defines the second limiting channel 524; the firing rod 3 of the closing firing assembly consists of two pieces, and the two firing rods 3 are respectively located on both sides of the closing pull tab 4, and a lubrication structure is provided between the outer wall of the firing rod 3 and the inner wall of the connecting limiting member 5. The lubrication structure may be lubricating oil or lubricant such as medical-grade sodium stearate provided between the outer wall of the firing rod 3 and the inner wall of the connecting limiting member 5; in another embodiment, it may be a lubricating coating provided on its surface; or the connecting limiting member and the firing rod 3 may be made of different materials to overcome the friction between the same materials, for example, the connecting limiting member 5 is made of plastic material such as PP (polypropylene), and the firing rod 3 is made of metal material such as medical-grade 304 steel.

[0074] like Figure 9 As shown, to avoid interference with the movement of the closing pin 71 by the limiting part 52, the highest point of the limiting part 52 corresponding to the position area of ​​the first pin groove 111 is lower than the lowest point of the closing pin 71. Therefore, although the limiting part 52 restricts the lateral displacement of the closing tab 4, it does not affect the normal functioning of the closing tab 4 and the closing pin 71. Optionally, in this embodiment, the highest point of the limiting part 52 corresponding to the position area of ​​the first pin groove 111 is lower than the highest point of the connection area 525 between the limiting part 52 and the first fixing part 51. That is, the proximal portion of the limiting part 52 is higher. This is beneficial for improving the structural strength at the connection point between the limiting part 52 and the first fixing part 51, and also for enhancing the limiting effect of the proximal portion of the limiting part 52 on the firing lever 3 and the closing tab 4.

[0075] In this embodiment, the limiting part 52 includes a first mating part 53, and the staple cartridge frame 11 is provided with a second mating part. The first mating part 53 and the second mating part abut against each other in the longitudinal direction to limit the longitudinal movement of the limiting part 52 relative to the staple cartridge frame 11, thereby improving the longitudinal positional stability of the limiting part 52 relative to the staple cartridge frame 11. Figures 10-12As shown, in this embodiment, the first mating part 53 is located on the side of the staple cartridge frame 11 opposite to the anvil 9. The side of the first mating part 53 facing the staple cartridge frame 11 includes a first mating surface 531, and the second mating part includes a second mating surface 115. The first mating surface 531 abuts against the second mating surface 115. The staple cartridge frame 11 includes an axially extending tool groove 114, and the two second mating surfaces 115 are respectively located on both sides of the tool groove 114. The limiting part 52 includes a first limiting part 521 and a second limiting part 522. The first limiting part 521 is connected between the second limiting part 522 and the first fixing part 51. The second limiting part 522 includes two side walls, and the first limiting part 521 includes two side walls and a bottom wall. The two side walls of the first limiting part 521 and the two side walls of the second limiting part 522 form two extension arms 529 of the limiting part 52. The staple cartridge 11 has a mating hole 113 on the side opposite to the second clamp, and the first limiting part 521 at least partially enters the mating hole 113. The second mating surface 115 is located on the distal side of the mating hole 113. The first mating part 53 is disposed on the distal side of the bottom wall of the first limiting part 521. There is a certain height gap between the first mating surface 531 of the first mating part 53 and the bottom of the side wall of the second limiting part 522, so that the first mating part 53 and the second mating surface 115 abut against each other.

[0076] like Figures 10-12 As shown, the limiting part 52 further includes a third mating surface 523, and the staple cartridge frame 11 further includes a fourth mating surface 116. The third mating surface 523 and the fourth mating surface 116 abut against each other in the axial direction, restricting the limiting part 52 from moving in the distal direction relative to the staple cartridge frame 11. In this embodiment, the third mating surface 523 is located at the distal end of the first limiting part 521, and the fourth mating surface 116 is located on the distal inner wall of the mating hole 113. The third mating surface 523 is located on the proximal side of the fourth mating surface 116. The third mating surface 523 and the fourth mating surface 116 abut against each other in the axial direction, that is, the third mating surface 523 cannot undergo axial displacement relative to the fourth mating surface 116, thereby improving the axial positional stability of the limiting part 52.

[0077] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A nail head, characterized in that, For use in a medical stapler, the staple head includes a first clamp, a closing firing assembly, and a connecting limiting member. The closing firing assembly includes a firing rod, and the connecting limiting member includes a limiting part and a first fixing part. The first fixing part is fixed to the proximal side of the first clamp, and the limiting part is at least partially located inside the first clamp. The limiting part includes two axially extending extension arms, and the extension arms extend axially from the first fixing part toward the distal side of the stapler. The connecting limiting member is provided with a limiting channel, the closed firing assembly is at least partially inserted into the interior of the limiting channel, and the two extension arms are respectively located on both sides of the firing rod. The limiting part restricts the lateral movement of the closed firing assembly.

2. The nail head according to claim 1, characterized in that, The first clamp has a second fixing part on its proximal side. The second fixing part has a hollow cavity. The first fixing part enters at least partially into the hollow cavity, and the shape of the first fixing part is adapted to that of the second fixing part.

3. The nail head according to claim 2, characterized in that, The outer contour of the first fixing part and the inner contour of the second fixing part are non-circular cross sections, and the first fixing part and the second fixing part are tightly fitted to each other.

4. The nail head according to claim 1, characterized in that, The inner wall of the connecting limiting member and / or the outer side of the closing firing assembly are provided with a lubrication structure.

5. The nail head according to claim 1, characterized in that, A first lateral gap is formed between the inner sides of the two extension arms of the limiting part and the outer side of the closed firing assembly.

6. The nail head according to claim 1, characterized in that, The closed firing assembly also includes a closed pull tab, and the distal end of the firing rod is provided with a cutter. In the initial state, the cutter is at least partially located between the two extension arms of the limiting portion.

7. The nail head according to claim 1, characterized in that, The limiting part includes a first mating part, and the first clamp is provided with a second mating part. The first mating part and the second mating part abut against each other in the longitudinal direction to restrict the limiting part from moving longitudinally relative to the first clamp.

8. The nail head according to claim 7, characterized in that, It also includes a second clamp disposed opposite to the first clamp, wherein the first mating part is located on the side of the first clamp away from the second clamp, and the side surface of the first mating part facing the first clamp abuts against the second mating part.

9. The nail head according to claim 8, characterized in that, The limiting part includes a first limiting part and a second limiting part. The second limiting part is connected to the first fixing part through the first limiting part. The first mating part is provided between the first limiting part and the second limiting part.

10. The nail head according to claim 9, characterized in that, The first clamp has a mating hole on the side opposite to the second clamp, and the first limiting part enters at least partially into the mating hole. The first mating part is located on the distal side of the bottom wall of the first limiting part.

11. The nail head according to claim 8, characterized in that, The first mating part includes a first mating surface on the side facing the first clamp, and the second mating part includes a second mating surface that abuts against the first mating surface; The first clamp includes an axially extending tool groove, and two second mating surfaces are located on both sides of the tool groove.

12. The nail head according to claim 10, characterized in that, The limiting part further includes a third mating surface, and the first clamp further includes a fourth mating surface. The third mating surface and the fourth mating surface abut against each other in the axial direction, restricting the movement of the limiting part relative to the first clamp in the distal direction.

13. The nail head according to claim 12, characterized in that, The third mating surface is located at the distal end of the first limiting part, the fourth mating surface is located on the distal inner wall of the mating hole, and the third mating surface is located on the proximal side of the fourth mating surface.

14. The nail head according to claim 6, characterized in that, The distal end of the closing pull tab is connected to the first clamp by a closing pin. The first clamp is provided with a first pin groove extending in the axial direction. The closing pin at least partially enters the first pin groove and can move along the extension direction of the first pin groove. The height of the highest point of the limiting part corresponding to the position area of ​​the first pin groove is less than the height of the lowest point of the closing pin.

15. The nail head according to claim 14, characterized in that, The highest point of the limiting part corresponding to the position area of ​​the first pin groove is less than the highest point of the connection position area between the limiting part and the first fixing part.

16. The nail head according to claim 1, characterized in that, The first fixing part is fixedly connected to the proximal end of the first clamp by a connecting pin.

17. The nail head according to claim 16, characterized in that, It also includes a swivel pull tab, the distal end of which is fixed to the connecting pin.

18. A medical stapler, characterized in that, Includes the nail head as described in any one of claims 1 to 17.

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