staple head and medical stapler

Abstract

This invention provides a staple head and a medical stapler. The staple head includes: a first clamp and a connector; a cutter with a first stop portion on at least one side wall; and at least one stop arm, the proximal end of which is connected to the connector. The stop arm includes a second stop portion. In a first state where the stop arm is not subjected to external force, at least a portion of the stop arm is located near the side wall close to the cutter, and at least a portion of the second stop portion is located on the path of the first stop portion moving towards the distal end of the first clamp. In a second state where the stop arm is driven and at least a portion moves laterally outward, the second stop portion disengages from the path of the first stop portion moving towards the distal end of the first clamp, and at this time, the stop arm is farther from the side wall away from the cutter compared to the first state. This invention can simply and effectively prevent secondary firing of the stapler without replacing the already fired staple cartridge.

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] In the prior art, medical staplers generally include an instrument platform, a firing handle movably connected to the instrument platform, and a staple head mounted on the instrument platform. The staple cartridge assembly can be inserted through a small incision in the body via a trocar to access the surgical site for surgery. The staple head includes a staple cartridge assembly and an anvil arranged opposite each other. The staple cartridge assembly generally includes a staple cartridge, a staple cartridge holder, and a firing block, a cutting blade, and a pusher rod arranged sequentially from the distal to the proximal side of the stapler, with the pusher rod located within a housing. When the stapler is fired, the pusher rod pushes the cutting blade to move distally. During the movement of the cutting blade, the staple cartridge assembly and the anvil close, cutting the tissue located between the staple cartridge assembly and the anvil, and driving the firing block to push the staples out of the staple cartridge and attach them to the tissue.

[0003] After completing the above suturing and cutting actions, the operator needs to reset the stapler and then replace the staple cartridge assembly so that the medical stapler can be used for the next suturing and cutting operation. However, during the operation, there may be situations where the operator fires the stapler again without replacing the already fired staple cartridge, or fires the stapler without installing it, which may lead to adverse consequences.

[0004] 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

[0005] To address the problems in the prior art, the present invention aims to provide a staple head and a medical stapler that can simply and effectively prevent secondary firing of the stapler without replacing the already fired staple cartridge.

[0006] This invention provides a staple head for a medical stapler, the staple head comprising:

[0007] A first clamp and a connector, wherein the first clamp is connected to the instrument platform of the medical stapler via the connector;

[0008] The cutter is located on the proximal side of the first clamp, and at least one side wall is provided with a first stop.

[0009] At least one stop arm, the proximal end of which is connected to the connector, the stop arm including a second stop portion;

[0010] In the first state, when the stop arm is not subjected to external force, the stop arm is at least partially located on a side wall close to the cutter, and the second stop portion is at least partially located on the path of the first stop portion moving toward the distal end of the first clamp. In the second state, when the stop arm is driven and at least partially moves laterally outward, the second stop portion disengages from the path of the first stop portion moving toward the distal end of the first clamp, and at this time, the stop arm is away from the side wall of the cutter relative to the first state.

[0011] In some embodiments, when the stop arm is not subjected to external force, the second stop portion and the first stop portion form an embedded engagement.

[0012] In some embodiments, the first stop is a boss disposed on the side of the cutter, and the second stop includes a stop groove. When the stop arm is not subjected to external force, the boss at least partially enters the stop groove and stops at the far end of the stop groove.

[0013] Alternatively, the second stop is a boss, and the first stop is a stop groove provided on the side of the cutter. When the stop arm is not subjected to external force, the boss at least partially enters the stop groove and stops at the proximal end of the stop groove.

[0014] In some embodiments, the stop groove extends axially, and the axial length of the stop groove is greater than the axial length of the boss, and the boss can move axially within the stop groove.

[0015] In some embodiments, a firing block is further included, the firing block including a drive portion, which, when the firing block is located on the proximal side of the first clamp, drives the stop arm to move laterally at least partially outward, such that the second stop portion disengages from the path of the first stop portion moving toward the distal side of the first clamp.

[0016] In some embodiments, the stop arm is at least partially elastic, and when the stop arm is driven by the drive unit to move laterally at least partially outward, the stop arm undergoes at least partially lateral elastic deformation; after the drive unit separates from the stop arm, the stop arm returns to its initial state.

[0017] In some embodiments, when the firing block is located on the proximal side of the first clamp, the drive portion at least partially enters between the sidewall of the cutter and the inner sidewall of the stop arm.

[0018] In some embodiments, the drive unit is provided with a first guide surface on the side opposite to the stop arm, and / or, the stop arm is provided with a second guide surface on the inner side of its distal end.

[0019] In some embodiments, the stop arm includes a mating section and a first connecting section extending axially, the mating section being provided with a second stop portion, and the first connecting section being connected between the proximal end of the mating section and the connector.

[0020] In some embodiments, when the stop arm is not subjected to external force, the lateral distance between the mating section at the second stop portion and the side wall of the cutter is less than the lateral distance between the first connecting section and the side wall of the cutter.

[0021] In some embodiments, the connector includes a connector body and a fixing arm extending axially, the proximal end of the fixing arm being connected to the distal end of the connector body, and the fixing arm including a second connecting segment fixed to the first connecting segment.

[0022] In some embodiments, the shape of the second connecting segment is adapted to the shape of the first connecting segment;

[0023] The second connecting segment is fixed to one side of the first connecting segment, or the second connecting segment and the first connecting segment are fixed by injection molding.

[0024] In some embodiments, the stop arm further includes a first extension located above the mating section, and the fixing arm further includes a second extension adapted to the shape of the first extension;

[0025] The second extension is fixed to one side of the first extension, or the second extension and the first extension are fixed together by injection molding.

[0026] In some embodiments, the stop arm and the fixed arm are made of different materials.

[0027] In some embodiments, the stop arm is a metal arm, the fixing arm is a plastic arm, the stop arm and the fixing arm are fixed by injection molding, and the first extension section and the first connecting section of the stop arm are respectively provided with at least one through hole.

[0028] In some embodiments, the first clamp includes a staple cartridge frame, the bottom surface of which has a mating hole, and the bottom surface of the fixing arm at least partially enters the mating hole;

[0029] The fixed arm has a first stop portion on its proximal side, which abuts against the proximal surface of the mating hole; and / or, the fixed arm has a second stop portion on its distal side, which abuts against the distal surface of the mating hole.

[0030] In some embodiments, a proximal connecting portion is provided on the proximal side of the connector body, and the proximal connecting portion is fixed to the distal side of the nail cartridge housing of the instrument platform.

[0031] The interior of the connector body defines an axially extending channel for passing through the closing pull tab and firing lever of the medical stapler.

[0032] In some embodiments, the device further includes a second clamp and an auxiliary opening member, wherein the proximal end of the second clamp and the proximal end of the first clamp are connected by a closing pin, and the auxiliary opening member is movable in an axial direction, and the auxiliary opening member includes a lifting portion and a pin engagement portion.

[0033] When the closing pin moves toward the distal end, the closing pin drives the pin mating part to move the auxiliary opening part toward the distal end, and the lifting part drives the second clamp to move away from the first clamp.

[0034] In some embodiments, a first mating portion is provided on the proximal side of the auxiliary opening member, and a second mating portion is provided on the proximal side of the fixing arm. When the auxiliary opening member moves toward the distal side, the first mating portion stops at the second mating portion.

[0035] In some embodiments, the distal end of the connector body includes a stop surface, and the proximal end of the auxiliary opening member is provided with a third stop portion;

[0036] When the closing pin moves toward the proximal side, the closing pin drives the auxiliary opening member to move toward the proximal side through the pin mating part, and the third stop part stops at the stop surface.

[0037] In some embodiments, the pin mating portion includes a mating groove and a protrusion disposed on the sidewall of the mating groove, the distal end of the mating groove is closed, and the closing pin at least partially enters the mating groove and is located between the distal end of the mating groove and the protrusion.

[0038] When the closing pin moves towards the proximal side, the closing pin cooperates with the protrusion to drive the auxiliary opening member to move towards the proximal side.

[0039] This invention also provides a medical stapler, including the aforementioned staple head.

[0040] The staple head and medical stapler provided by this invention have the following advantages:

[0041] This invention provides a stapler cartridge assembly for a medical stapler. A stop arm is provided at the distal end of the connector. When the stapler is ready to fire, an external force is applied to the stop arm, causing it to move at least partially laterally outward away from the sidewall of the cutter, without obstructing the movement of the cutter towards the distal end. At this time, the stapler can be fired normally. After the stapler has been fired, the cutter returns to the proximal end of the staple head. The stop arm, no longer subjected to external force, approaches the sidewall of the cutter. The cooperation of the second and first stop portions prevents the cutter from moving towards the distal end, thus preventing the stapler from being fired again without replacing the already fired stapler cartridge. Attached Figure Description

[0042] 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.

[0043] Figure 1 This is a schematic diagram of the structure of the nail head and the nail box shell in one embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the staple head and the staple cartridge shell after removing the staple cartridge frame according to an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of the staple head and the pusher rod after removing the staple cartridge and staple cartridge frame according to an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of a cutter according to an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of the cutter and the connecting component in accordance with an embodiment of the present invention;

[0048] Figure 6 This is a schematic diagram of the connection component and the nail box housing according to an embodiment of the present invention;

[0049] Figure 7 and Figure 8 This is a schematic diagram of the connection component and the staple cartridge frame in accordance with an embodiment of the present invention;

[0050] Figure 9 This is a bottom view of the connecting component and the cutter when the stop arm is in the first state according to an embodiment of the present invention;

[0051] Figure 10 and Figure 11 This is a schematic diagram of the structure of a connection component according to an embodiment of the present invention;

[0052] Figure 12 This is a schematic diagram of the connection between the connector and the stop arm according to an embodiment of the present invention;

[0053] Figure 13 This is a schematic diagram of the structure of the firing block, the cutter, and the connecting assembly in accordance with an embodiment of the present invention;

[0054] Figure 14 This is a bottom view of the firing block, cutter and connecting assembly in cooperation when the stop arm is in the first state according to an embodiment of the present invention;

[0055] Figure 15 This is a schematic diagram of the firing block according to an embodiment of the present invention;

[0056] Figure 16 and Figure 17 This is a schematic diagram of the structure of the auxiliary opening member and the connecting component in accordance with an embodiment of the present invention.

[0057] Figure label:

[0058] 11. Staple cartridge 52. Proximal connector

[0059] 12 staple cartridge frame 53 stop surface

[0060] 121 Mating hole 54 Fixed arm

[0061] 122 Outer section 541 Second connecting section

[0062] 113 First pin groove 542 Second extension section

[0063] 13 Anvil 543 First Stop (near)

[0064] 131 Second pin groove 544 Second stop part (far)

[0065] 14 Closing pin 545 Second mating part

[0066] 21 Nail box housing 55 channels

[0067] 211 Mounting slot 6 Stop arm

[0068] 22 Closed pull tab 61 Matching segment

[0069] 23 Firing lever 611 Stop groove

[0070] 3. Cutting blade 612 Second guiding surface

[0071] 31 Boss 62 First connecting section

[0072] 32 Blade 63 First Extension Section

[0073] 33 Cutter sidewall 64 Through hole

[0074] 4. Firing Block 7. Auxiliary Opening Component

[0075] 41 Drive unit 71 Lifting unit

[0076] 411 First guiding surface 72 Mating groove

[0077] 42 Push pin section 73 Protrusion section

[0078] 5 Connector 74 First mating part

[0079] 51 Connector body 75 Third stop part Detailed Implementation

[0080] 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.

[0081] This invention provides a stapler cartridge assembly for a medical stapler and a medical stapler including the stapler cartridge assembly. The medical stapler includes an instrument platform, a firing handle movably connected to the instrument platform, and a staple head mounted on the instrument platform, the staple head being located at the distal end of the instrument platform. The staple head includes: a first clamp and a connector, the first clamp being connected to the instrument platform of the medical stapler via the connector; a cutter, at least one sidewall having a first stop portion; and at least one stop arm, the proximal end of the stop arm being connected to the connector, the stop arm including a second stop portion. The stop arm includes a first state and a second state, the stop arm being closer to the sidewall of the cutter in the first state compared to the second state.

[0082] When the stapler is ready to fire, an external force is applied to the stop arm, causing it to move at least partially laterally outward away from the sidewall of the cutter. The second stop part disengages from the path of the first stop part moving towards the distal end of the first clamp. The stop arm is in a second state, away from the sidewall of the cutter compared to the first state. At this time, the stop arm does not obstruct the movement of the cutter towards the distal end, and the stapler can be fired normally by driving the cutter towards the distal end. After the stapler is fired, the cutter returns to the proximal end of the staple head. The stop arm is not subjected to external force and is close to the sidewall of the cutter, in the first state. The second stop part is located on the path of the first stop part moving towards the distal end of the first clamp. The cooperation of the second stop part and the first stop part blocks the movement of the cutter towards the distal end, preventing the stapler from being fired again, thus effectively preventing secondary firing of the stapler without replacing the already fired staple cartridge.

[0083] 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.

[0084] Figures 1-17 The structure of a nail head according to an embodiment of the present invention is shown. For example... Figure 1 and Figure 2 As shown, the staple head includes a first clamp and a second clamp disposed opposite to each other. The structure of this embodiment is described in detail below using the first clamp as the staple cartridge assembly and the second clamp as the anvil 13 as an example. The staple cartridge assembly includes a staple cartridge 11 for receiving anastomotic staples and a staple cartridge holder 12 for receiving the staple cartridge 11. The staple head also includes a connector 5, a cutter 3, and at least one stop arm 6, the connector 5 and the stop arm 6 together forming a connecting assembly. The stop arm 6 has a first state close to the cutter 3 and a second state away from the cutter 3. The staple cartridge assembly and the anvil 13 are connected to the staple cartridge housing 21 of the instrument platform via the connector 5. Figures 3-6 As shown, in the initial state, the cutter 3 is located on the proximal side of the staple cartridge 11. The distal side of the cutter 3 is provided with a blade 32 for cutting tissue, and at least one sidewall 33 of the cutter 3 is provided with a first stop portion. The proximal side of the stop arm 6 is connected to the connector 5, and the stop arm 6 includes a second stop portion.

[0085] When the stapler is ready to fire, an external force is applied to the stop arm 6, causing it to move at least partially laterally outward away from the side wall 33 of the cutter 3. The second stop part disengages from the path of the first stop part moving towards the distal end of the staple cartridge. At this time, the stop arm 6 is in a second state and does not obstruct the movement of the cutter 3 towards the distal end. The stapler can be fired normally by driving the cutter 3 towards the distal end. After the stapler is fired, the cutter 3 returns to the proximal end of the staple head. The stop arm 6 is not subjected to external force and is close to the side wall 33 of the cutter 3, in a first state. The second stop part is located on the path of the first stop part moving towards the distal end of the staple cartridge. The cooperation of the second stop part and the first stop part blocks the movement of the cutter 3 towards the distal end. At this time, the stapler cannot be fired, thus effectively preventing the stapler from firing again without replacing the fired staple cartridge 11.

[0086] 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 this perspective, for the stapled cartridge 12, its distal side is the left side, and its proximal side is the right side. Definition Figure 1 In this context, the S1 direction is the direction from the distal end to the proximal end of the stapler. The S1 direction, or the direction opposite to S1, is defined as the axis of the stapler. Figure 1 In this context, S2 represents the longitudinal direction, i.e., the height direction. (Definition) Figure 14 In this invention, the S3 direction is the transverse direction, i.e., the width direction. For a given component, the inner and outer sides are relative to the axis of the anastomosis device; the side closer to the axis is the inner side, and the side farther from the axis is the outer side.

[0087] like Figure 4 and Figure 5As shown, in this embodiment, the first stop is a boss 31 disposed on the side of the cutter 3. The boss 31 can be a cylindrical boss, a cuboid boss, or a boss with a trapezoidal, rhomboid, elliptical, or other shapes in cross-section. The connector 5 includes a connector body 51. The stop arm 6 includes a mating section 61 and an axially extending first connecting section 62. The proximal end of the mating section 61 is connected to the distal end of the connector body 51 through the first connecting section 62. The second stop includes a stop groove 611. When the stop arm 6 is not subjected to external force, the boss 31 at least partially enters the stop groove 611 and stops at the distal end of the stop groove 611. In this embodiment, the stop groove 611 is an oblong groove. The stop groove 611 extends axially, and the axial length of the stop groove 611 is greater than the axial length of the boss 31. The boss 31 can move axially within the stop groove 611. In another embodiment, the stop groove 611 can also connect to the lower or upper surface of the mating section 61, as long as the distal end of the stop groove 611 is closed, allowing the boss 31 to be stopped at the distal end of the stop groove 611. The stop groove 611 can connect the inner and outer surfaces of the mating section 61, or it can be provided only on the inner surface of the mating section 61. In yet another embodiment, the second stop portion can be a boss, and the first stop portion can be a stop groove provided on the side of the cutter 3. The stop groove is closed at least at its proximal end. When the stop arm is not subjected to external force, the boss at least partially enters the stop groove and is stopped at the proximal end of the stop groove. In yet another embodiment, both the first and second stop portions can be bosses. When the stop arm 6 is not subjected to external force, the second stop portion is located at the distal end of the first stop portion, blocking the movement of the first stop portion towards the distal end.

[0088] like Figures 6-8 The connection method between the connector 5 and the staple cartridge assembly and the staple cartridge housing 21 is shown. For example... Figure 6 As shown, a proximal connecting portion 52 is provided on the proximal side of the connector body 51, and the proximal connecting portion 52 is fixed to the distal side of the staple cartridge housing 21 of the instrument platform. Specifically, the proximal connecting portion 52 includes two fixing posts, and the staple cartridge housing 21 is provided with a mounting groove 211 adapted to the shape of the fixing posts, and the fixing posts are fixed in the mounting groove 211. The staple cartridge housing 21 includes an upper housing and a lower housing. Figure 6 The image only shows the mounting groove 211 of the lower housing as an example; the upper housing is also provided with a mounting groove corresponding to the mounting groove 211 of the lower housing.

[0089] like Figure 6As shown, the connector body 51 defines an axially extending channel inside, through which the closing pull tab 22 and the firing rod 23 of the medical stapler pass. The firing rod 23, after passing through the channel, engages with the proximal side of the cutter 3. The closing pull tab 22, after passing through the channel, engages with a closing pin 14. The connector 5 also includes a fixing arm 54, the proximal side of which is connected to the distal side of the connector body 51. The bottom surface of the staple cartridge 12 has a mating hole 121, into which at least a portion of the bottom surface of the fixing arm 54 enters. The proximal side of the fixing arm 54 has a first stop portion 543 that abuts against the proximal surface of the mating hole 121, and the distal side of the fixing arm 54 has a second stop portion 544 that abuts against the distal surface of the mating hole 121. Figure 7 As shown, the staple cartridge 12 has a cover portion 122 on its proximal side. The cover portion 122 is fitted over the outside of the connector body 51. The outer contour of the connector body 51 and the inner contour of the cover portion 122 are non-circular cross sections to prevent the cover portion 122 from rotating relative to the connector body 51. The cover portion 122 and the connector body 51 are tightly fitted together.

[0090] The following is combined with Figure 5 , Figures 9-15 The working process of the nail head in this embodiment is described in detail. Figure 5 and Figure 9 This illustrates the state in which the stop arm 6 blocks the movement of the boss 31 toward the distal end when no external force is applied, hereinafter referred to as the first state. Figure 13 and Figure 14 The diagram shows the state in which the stop arm 6 is subjected to an external force and moves laterally outward, so that the stop groove 611 does not block the boss 31 from moving toward the distal side. This state is referred to as the second state.

[0091] The staple cartridge assembly further includes a firing block 4, which includes a staple pushing part 42. When the stapler fires, the cutter 3 can drive the firing block 4 to move distally, causing the staple pushing part 42 to push the staples in the staple cartridge 11 toward the anvil 13. In this embodiment, the switching of the stop arm 6 between a first state and a second state is achieved via the firing block 4. Figure 15 As shown, the firing block 4 also includes a driving part 41, which is an extension arm provided on the proximal side of the firing block 4. When the firing block 4 is located on the proximal side of the nail cartridge 11, the driving part 41 drives the stop arm 6 to move laterally outward, so that the stop arm 6 enters the second state from the first state, and the stop groove 611 separates from the boss 31.

[0092] In this embodiment, the stop arm 6 is at least partially elastic. For example, the stop arm 6 may be made of a thin metal sheet, but the invention is not limited thereto. When the stop arm 6 is driven laterally outward by the drive unit 41, the stop arm 6 undergoes at least partially lateral elastic deformation. After the drive unit 41 separates from the stop arm 6, the mating section 61 returns to its initial state under the action of the elastic deformation restoring force.

[0093] In the initial state, both the cutter 3 and the firing block 4 are located on the proximal side of the staple cartridge assembly. The driving part 41 of the firing block 4 drives the stop arm 6 to move laterally outward, causing the stop arm 6 to enter the second state. The stop arm 6 undergoes at least partial lateral elastic deformation, and the stop groove 611 separates from the boss 31. At this time, the firing rod 23 drives the cutter 3 to move distally, and the cutter 3 drives the firing block 4 to move distally to push the staples towards the anvil 13. The staples are attached to the tissue, and at the same time, the cutter 3 cuts the tissue, thus completing the firing of the stapler. After the stapler is fired, the cutter 3 returns to the proximal side of the staple cartridge assembly, while the firing block 4 remains on the distal side of the staple cartridge assembly. At this time, the stop arm 6 is no longer subjected to the force of the firing block 4. Under the action of the elastic deformation recovery force, the stop arm 6 returns to the first state, that is, the stop groove 611 and the boss 31 form an embedded fit, and the boss 31 is stopped at the far end of the stop groove 611, that is, it cannot drive the cutter 3 to move to the far end side to fire the stapler.

[0094] like Figure 5 and Figure 9 As shown, when the stop arm 6 is in the first state, the boss 31 is at least partially inserted into the stop groove 611 and stops at the distal end of the stop groove 611. When the firing rod 23 applies a force to the cutter 3 in the distal direction, the cutter 3 cannot continue to move in the distal direction because the boss 31 is blocked by the distal end face of the stop groove 611, and therefore cannot fire the stapler. Figure 9As shown, when the stop arm 6 is not subjected to external force, the lateral distance (distance along the S3 direction) between the mating section 61 at the stop groove 611 and the side wall 33 of the cutter 3 is less than the lateral distance (distance along the S3 direction) between the first connecting section 62 and the side wall 33 of the cutter 3. That is, the stop groove 611 is closer to the side wall of the cutter 3 than the first connecting section 62. Therefore, when the firing block 4 enters between the mating section 61 and the side wall 33 of the cutter 3, elastic deformation is more likely to occur at the connection position of the mating section 61 and the first connecting section 62, causing the mating section 61 to move laterally outward. In this embodiment, the cutter 3 has protrusions 31 on both sides, and a stop arm 6 is provided on each side of the cutter 3. The stop groove 611 of each stop arm 6 forms an embedded fit with a protrusion 31. The lateral distance between the two stop arms 6 at the stop groove 611 is less than the lateral distance between the first connecting sections 62 of the two stop arms 6, and the stop arms 6 are inclined toward the side wall 33 of the cutter 3 at the stop groove 611.

[0095] like Figures 10-12 As shown, in this embodiment, the stop arm 6 is fixed to the distal end of the connector body 51 by the fixing arm 54. The fixing arm 54 includes a second connecting segment 541, which is fixed to the first connecting segment 62. The connection between the second connecting segment 541 and the first connecting segment 62 strengthens the structural strength of the first connecting segment 62 of the stop arm 6 and fixes the stop arm 6 to the distal end of the connector body 51. In this embodiment, the shape of the second connecting segment 541 is adapted to the shape of the first connecting segment 62. The second connecting segment 541 is fixed to one side of the first connecting segment 62, for example, by bonding, welding, or by injection molding. To further improve the fit between the stop arm 6 and the fixed arm 54, the stop arm 6 further includes a first extension 63. The first extension 63 is located above the mating section 61 and is separately disposed from the mating section 61, meaning it does not obstruct the lateral movement of the mating section 61. The fixed arm 54 further includes a second extension 542 adapted to the shape of the first extension 63. The second extension 542 is fixed to one side of the first extension 63, for example, by bonding, welding, or by injection molding.

[0096] The stop arm 6 and the fixing arm 54 can be made of different materials, and their combination can achieve a better fit. In this embodiment, the stop arm 6 is a metal arm, and the fixing arm 54 is a plastic arm. The stop arm 6 and the fixing arm 54 are fixed together by injection molding. The first extension section 63 and the first connecting section 62 of the stop arm 6 are each provided with at least one through hole 64 to enhance the bonding strength between the stop arm 6 and the fixing arm 54 during the injection molding process.

[0097] like Figures 13-15 As shown, when the firing block 4 is located on the proximal side of the staple cartridge assembly, the driving part 41 at least partially enters between the side wall 33 of the cutter 3 and the inner side wall of the mating section 61, pushing the mating section 61 outward, causing it to move laterally outward, and the stop groove 611 disengages from the boss 31. In this embodiment, the firing block 4 is provided with two driving parts 41. At this time, when the cutter 3 is driven to move in the distal direction by the firing rod 23, the cutter 3 can drive the firing block 4 to move in the distal direction together, the firing block 4 pushes out the staples, and the cutter 3 cuts the tissue to fire the stapler. In order to better guide the driving part 41 into the space between the mating section 61 and the side wall 33 of the cutter 3, the driving part 41 is provided with an inclined first guide surface 411 on the side opposite to the stop arm 6, and an inclined second guide surface 612 is provided on the distal inner side of the mating section 61.

[0098] like Figure 1 As shown, the staple head includes an anvil 13 and a staple cartridge assembly disposed opposite each other. The anvil 13 has a third state of being open relative to the staple cartridge assembly and a fourth state of being closed relative to the staple cartridge assembly. A first pin groove 123 is provided at an angle on the proximal side of the anvil 13, and a second pin groove 131 extending axially is provided on the proximal side of the staple cartridge assembly. A closing pin 14 passes through both the first pin groove 123 and the second pin groove 131. When the closing pin 14 is located at the distal side of the second pin groove 131, the anvil 13 is in the third state. When the closing pin 14 moves from the distal side to the proximal side of the second pin groove 131, the anvil 13 enters the fourth state, and the anvil 13 and the staple cartridge assembly clamp the tissue. The process by which the anvil 13 moves from the third state to the fourth state is called the closing process of the staple head. The instrument platform is provided with a closing pull tab 22 for closing the nail head. The distal end of the closing pull tab 22 is connected to the closing pin 14. When the closing pull tab 22 moves to the proximal end, it can pull the closing pin 14 to the proximal end, thereby closing the nail head.

[0099] like Figure 16 and Figure 17As shown, in this embodiment, the staple head further includes an auxiliary opening member 7, used to assist in opening the staple head after the stapler is fired. The auxiliary opening member 7 is movable in the axial direction. The auxiliary opening member 7 includes a lifting part 71 and a pin engagement part. Figure 16 As shown, the lifting part 71 is a protrusion that is positioned toward the direction of the second clamp. Figure 16 The positions of the auxiliary opening element 7 and the closing pin 14 are shown when the pin head is open. Figure 17 The positions of the auxiliary opening member 7 and the closing pin 14 are shown when the pin head is closed. In this embodiment, the pin engagement portion includes a engagement groove 72 and a protrusion 73 disposed on the sidewall of the engagement groove 72. The distal end of the engagement groove 72 is closed. The closing pin 14 is at least partially inserted into the engagement groove 72 and is located between the distal end of the engagement groove 72 and the protrusion 73. At the location of the protrusion 73, the opening height of the engagement groove 72 is smaller than the diameter of the closing pin 14, thus retaining the closing pin 14 within the engagement groove 72 and preventing it from separating from the engagement groove 72.

[0100] When the closing tab 22 is driven to move proximally, the closing tab 22 drives the closing pin 14 to move proximally. The closing pin 14 cooperates with the protrusion 73 to drive the auxiliary opening member 7 to move proximally. The distal side of the connecting member body 51 includes a stop surface 53, and the proximal side of the auxiliary opening member 7 is provided with a third stop portion 75. When the auxiliary opening member 7 moves proximally, the third stop portion 75 stops at the stop surface 53, thereby limiting the range of movement of the auxiliary opening member 7 in the proximal direction. At this time, the closing pin 14 and the auxiliary opening member 7 are located at... Figure 17 In its current position, the nail head is closed, and the lifting part 71 of the auxiliary opening member 7 does not lift the nail anvil 13, thus maintaining the stability of the closed nail head.

[0101] exist Figure 17 In the current state, after the stapler has fired, when it is necessary to open the staple head, the closing pull tab 22 drives the closing pin 14 to move towards the distal side. The closing pin 14 abuts against the distal surface of the mating groove 72, thereby driving the auxiliary opening member 7 to move towards the distal side. At this time, the lifting part 71 drives the anvil 13 to move away from the staple cartridge holder 12 to assist in opening the staple head. After the staple head is opened, the closing pin 14 and the auxiliary opening member 7 return to the original position. Figure 16The auxiliary opening member 7 has a first engaging portion 74 on its proximal side and a second engaging portion 545 on its proximal side. When the auxiliary opening member 7 moves towards the distal side, the first engaging portion 74 stops at the second engaging portion 545, thereby limiting the range of movement of the auxiliary opening member 7 towards the distal side. In this embodiment, the auxiliary opening member 7 is located above the fixed arm 54. The first engaging portion 74 is a downward-facing protrusion on the proximal side of the auxiliary opening member 7, and the second engaging portion 545 is a downward-facing recess on the proximal side of the fixed arm 54. Alternatively, the first engaging portion 74 may be a recess and the second engaging portion 545 may be a protrusion.

[0102] The above embodiments use the first clamp as a staple cartridge assembly and the second clamp as a staple anvil as an example for illustration. It is understood that in other alternative embodiments, the first clamp can also be the staple anvil and the second clamp can be the staple cartridge assembly, which also falls within the protection scope of this invention.

[0103] 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 medical staplers, the staple head includes: A first clamp and a connector, wherein the first clamp is connected to the instrument platform of the medical stapler via the connector, the connector comprising a connector body and a fixing arm extending axially, the proximal end of the fixing arm being connected to the distal end of the connector body, and the fixing arm comprising a second connecting segment; The cutter is located on the proximal side of the first clamp, and at least one side wall is provided with a first stop. At least one stop arm, the proximal end of the stop arm being connected to the connector, the stop arm including a mating section and a first connecting section extending axially, the mating section being provided with a second stop portion, the first connecting section being connected between the proximal end of the mating section and the connector, the first connecting section being fixed to the second connecting section, and the stop arm being at least partially elastic; In the first state, when the stop arm is not subjected to external force, the stop arm is at least partially located on a side wall close to the cutter, and the second stop portion is at least partially located on the path of the first stop portion moving toward the distal end of the first clamp. In the second state, when the stop arm is driven and at least partially moves laterally outward, the stop arm undergoes at least partial lateral elastic deformation, the second stop portion disengages from the path of the first stop portion moving toward the distal end of the first clamp, and at this time, the stop arm is away from the side wall of the cutter relative to the first state.

2. The nail head according to claim 1, characterized in that, When the stop arm is not subjected to external force, the second stop part and the first stop part form an embedded fit.

3. The nail head according to claim 2, characterized in that, The first stop is a boss provided on the side of the cutter, and the second stop includes a stop groove. When the stop arm is not subjected to external force, the boss at least partially enters the stop groove and stops at the far end of the stop groove. Alternatively, the second stop is a boss, and the first stop is a stop groove provided on the side of the cutter. When the stop arm is not subjected to external force, the boss at least partially enters the stop groove and stops at the proximal end of the stop groove.

4. The nail head according to claim 3, characterized in that, The stop groove extends axially, and the axial length of the stop groove is greater than the axial length of the boss. The boss can move axially within the stop groove.

5. The nail head according to claim 1, characterized in that, It also includes a firing block, which includes a driving part. When the firing block is located on the proximal side of the first clamp, the driving part drives the stop arm to move laterally at least partially outward, so that the second stop part disengages from the path of the first stop part moving toward the distal side of the first clamp.

6. The nail head according to claim 5, characterized in that, After the drive unit separates from the stop arm, the stop arm returns to its initial state.

7. The nail head according to claim 5, characterized in that, When the firing block is located on the proximal side of the first clamp, the drive unit at least partially enters between the side wall of the cutter and the inner side wall of the stop arm.

8. The nail head according to claim 7, characterized in that, The drive unit is provided with a first guide surface on the side opposite to the stop arm, and / or, the stop arm is provided with a second guide surface on the inner side of its distal end.

9. The nail head according to claim 1, characterized in that, When the stop arm is not subjected to external force, the lateral distance between the mating section at the second stop and the side wall of the cutter is less than the lateral distance between the first connecting section and the side wall of the cutter.

10. The nail head according to claim 1, characterized in that, The shape of the second connecting segment is adapted to the shape of the first connecting segment; The second connecting segment is fixed to one side of the first connecting segment, or the second connecting segment and the first connecting segment are fixed by injection molding.

11. The nail head according to claim 10, characterized in that, The stop arm further includes a first extension section located above the mating section, and the fixing arm further includes a second extension section adapted to the shape of the first extension section; The second extension is fixed to one side of the first extension, or the second extension and the first extension are fixed together by injection molding.

12. The nail head according to claim 11, characterized in that, The stop arm and the fixed arm are made of different materials.

13. The nail head according to claim 11, characterized in that, The stop arm is a metal arm, the fixed arm is a plastic arm, the stop arm and the fixed arm are fixed by injection molding, and the first extension section and the first connecting section of the stop arm are respectively provided with at least one through hole.

14. The nail head according to claim 1, characterized in that, The first clamp includes a staple cartridge frame, the bottom surface of which has a mating hole, and the bottom surface of the fixing arm at least partially enters the mating hole; The fixed arm has a first stop portion on its proximal side, which abuts against the proximal surface of the mating hole; and / or, the fixed arm has a second stop portion on its distal side, which abuts against the distal surface of the mating hole.

15. The nail head according to claim 1, characterized in that, The proximal end of the connector body is provided with a proximal connection part, which is fixed to the distal end of the nail cartridge shell of the instrument platform. The interior of the connector body defines an axially extending channel for passing through the closing pull tab and firing lever of the medical stapler.

16. The nail head according to claim 1, characterized in that, It also includes a second clamp and an auxiliary opening member. The proximal side of the second clamp and the proximal side of the first clamp are connected by a closing pin. The auxiliary opening member can move in the axial direction and includes a lifting part and a pin engagement part. When the closing pin moves toward the distal end, the closing pin drives the pin mating part to move the auxiliary opening part toward the distal end, and the lifting part drives the second clamp to move away from the first clamp.

17. The nail head according to claim 16, characterized in that, The auxiliary opening member has a first mating part on its proximal side and a second mating part on its proximal side. When the auxiliary opening member moves toward the distal side, the first mating part stops at the second mating part.

18. The nail head according to claim 16, characterized in that, The distal end of the connector body includes a stop surface, and the proximal end of the auxiliary opening member is provided with a third stop portion. When the closing pin moves toward the proximal side, the closing pin drives the auxiliary opening member to move toward the proximal side through the pin mating part, and the third stop part stops at the stop surface.

19. The nail head according to claim 16, characterized in that, The pin mating part includes a mating groove and a protrusion disposed on the side wall of the mating groove. The distal end of the mating groove is closed. The closing pin is at least partially inserted into the mating groove and is located between the distal end of the mating groove and the protrusion. When the closing pin moves towards the proximal side, the closing pin cooperates with the protrusion to drive the auxiliary opening member to move towards the proximal side.

20. A medical stapler, characterized in that, Includes the nail head as described in any one of claims 1 to 19.

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