Closing drive mechanism and medical stapler

Abstract

The present invention provides a closure drive mechanism and a medical stapler, the stapler including a stapler body (1), the closure drive mechanism including a first pivot portion (412) and a second pivot portion (422), the first pivot portion (412) being pivotally connected to the stapler body (1) and the second pivot portion (422) being located on a proximal end side of the first pivot portion (412), a link assembly (4) having a first state and a second state, a firing handle (3) including a first engagement portion (32), and a second engagement portion (32) of the link assembly (4). and a closure pull rod assembly (5) pivotally connected to the first pivot portion (422) of the link assembly (4), when the link assembly (4) is in a first state and the firing handle (3) rotates along a first direction (S3), the first engagement portion (32) drives the link assembly (4) to enter a second state, the second pivot portion (422) of the link assembly (4) moves toward the proximal end of the stapler, and drives the closure pull rod assembly (5) to move toward the proximal end of the stapler. The closure drive mechanism and the medical stapler are simple in structure and can effectively control the closure of the staple head portion (9) of the stapler.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and specifically relates to a closing drive mechanism and a medical stapler.

Background Art

[0002] A medical stapler includes a medical stapler body, a firing handle movably connected to the medical stapler body, and a staple head portion engaging with the body. The staple head portion includes a staple cartridge assembly and an anvil installed oppositely. During surgery, first, the firing handle is gripped, and the closing pull tab is pulled by a closing drive mechanism to move it to the proximal end side of the stapler, thereby closing the staple cartridge assembly and the anvil. Then, the firing handle is gripped again, and the staples can be advanced to move towards the tissue. By forming the staples in the anvil in the staple cartridge assembly, the tissue is anastomosed, and at the same time, the cutter is moved to the distal end side to cut the tissue.

[0003] The current closing drive mechanism has a complex structure, which increases the production and maintenance costs. Moreover, the complex structure brings instability to the closing control. During the process of firing the stapler, the closing pull tab may be displaced in the distal end side direction of the stapler, which affects the closing effect between the staple cartridge assembly and the anvil and has an adverse effect on the surgical effect.

Summary of the Invention

[0004] In view of the problems in the prior art, the object of the present invention is to provide a closing drive mechanism and a medical stapler, which have a simple structure, can effectively control the closing of the staple head portion of the stapler, and can maintain the stability of the closing of the staple head portion.

[0005] An embodiment of the present invention provides a closing drive mechanism, which is used in a medical stapler. The stapler includes a stapler body, and the closing drive mechanism is A link assembly including a first pivot portion and a second pivot portion, wherein the first pivot portion is pivotally connected to the stapler body, the second pivot portion is located on the proximal end side of the first pivot portion, and having a first state and a second state, and a firing handle including a first engaging portion, and a closing pull rod assembly pivotally connected to the second pivot portion of the link assembly, and when the link assembly is in the first state and the firing handle rotates along a first direction, the first engaging portion drives the link assembly to enter the second state, the second pivot portion of the link assembly moves in the proximal end side direction of the stapler, and the closing pull rod assembly is driven to move in the proximal end side direction of the stapler.

[0006] In some embodiments, the link assembly includes a first rod and a second rod, the second rod is located on the proximal end side of the first rod, the first rod includes the first pivot portion and a third pivot portion, the second rod includes the second pivot portion and a fourth pivot portion, and the third pivot portion is pivotally connected to the fourth pivot portion.

[0007] In some embodiments, when the link assembly is in the first state and the firing handle rotates along a first direction, the first engaging portion drives the first rod to rotate along the first direction, and the second rod rotates along a second direction with respect to the first rod, the second direction being opposite to the first direction, and the included angle between the first rod and the second rod increases.

[0008] In some embodiments, the closing drive mechanism further includes a connecting rod, the closing pull rod assembly is sleeved outside the connecting rod, and when the link assembly moves from the first state to the second state, the third pivoting portion and the fourth pivoting portion move in a direction approaching the connecting rod, and drive the closing pull rod assembly to move in the proximal end side direction of the connecting rod.

[0009] In some embodiments, the closing drive mechanism further includes a closing pull tab located inside the connecting rod, the closing pull rod assembly includes a connected sleeve portion and a drive portion, the sleeve portion is sleeved outside the connecting rod and connected to the proximal end side of the closing pull tab, and the drive portion is pivotally connected to the second pivoting portion.

[0010] In some embodiments, the stapler body further includes a housing, a guide groove extending along the axial direction is installed on one of the inner surface of the housing and the drive portion of the closing pull rod assembly, and a guide portion is installed on the other, the guide portion at least partially enters the guide groove and is movable along the extending direction of the guide groove.

[0011] In some embodiments, the closing pull rod assembly further includes a connecting pin, a through hole is installed on the distal end side of the sleeve portion, and the connecting pin penetrates through the through hole on the distal end side of the sleeve portion and the proximal end side of the closing pull tab to fixedly connect the sleeve portion and the closing pull tab.

[0012] In some embodiments, a fixing member is further installed on the proximal end side of the connecting rod, and a closing return spring is installed between the sleeve portion and the fixing member.

[0013] In some embodiments, the third pivoting portion includes a concave groove, and the fourth pivoting portion at least partially enters into the concave groove of the third pivoting portion, or the fourth pivoting portion includes a concave groove, and the third pivoting portion at least partially enters into the concave groove of the fourth pivoting portion.

[0014] In some embodiments, the third pivoting portion includes a concave groove, and the fourth pivoting portion at least partially enters into the concave groove of the third pivoting portion. A protrusion is installed on the fourth pivoting portion. When the link assembly is in the second state, the protrusion abuts against the outer wall of the concave groove, preventing the second rod from continuously rotating along the second direction with respect to the first rod, or the fourth pivoting portion includes a concave groove, and the third pivoting portion at least partially enters into the concave groove of the fourth pivoting portion. A protrusion is installed on the third pivoting portion. When the link assembly is in the second state, the protrusion abuts against the outer wall of the concave groove, preventing the second rod from continuously rotating along the second direction with respect to the first rod.

[0015] In some embodiments, the first rod further includes a second engaging portion. The surface of the second engaging portion on the side facing the firing handle is an arc-shaped surface. When the link assembly is in the first state and the firing handle is in the initial position, the second engaging portion abuts against the first engaging portion of the firing handle.

[0016] In some embodiments, the first rod is a triangular rod. The first pivoting portion and the third pivoting portion are respectively installed at the first angular position and the second angular position of the triangular rod. The second engaging portion is installed at the third angular position of the triangular rod, and / or the second rod is a straight rod. The second pivoting portion and the fourth pivoting portion are respectively installed at the first end and the second end of the second rod.

[0017] In some embodiments, the stapler body includes a housing, the link assembly is located inside the housing, and the first pivoting portion is pivotally connected to the inner surface of the housing.

[0018] In some embodiments, the closing drive mechanism includes a connecting rod extending along the axial direction of the stapler, and a closing pull tab extending in the axial direction of the stapler and at least partially located inside the connecting rod. The closing pull rod assembly includes a first closing portion and a second closing portion. The first closing portion surrounds the outside of the connecting rod and is respectively connected to the proximal end side of the connecting rod and the proximal end side of the closing pull tab. When the connecting rod rotates around the central axis of the connecting rod, the closing pull tab and the first closing portion are driven to rotate around the central axis of the connecting rod. The second closing portion is pivotally connected to the second pivoting portion of the link assembly and is rotatably sleeved at least partially outside the first closing portion. When the second closing portion moves in the proximal end side direction of the stapler, the first closing portion drives the closing pull tab to move in the proximal end side direction.

[0019] In some embodiments, the second closing portion includes a connected outer cover portion and a driving portion. The outer cover portion is sleeved outside the first closing portion, and the first closing portion is rotatable around the central axis of the connecting rod relative to the outer cover portion. The driving portion is pivotally connected to the second pivoting portion of the link assembly.

[0020] In some embodiments, the first closing part includes a shaft portion and a disk portion. The disk portion is located on the proximal end side of the shaft portion. An annular first stepped surface is provided on the proximal end side of the outer cover portion of the second closing part. The shaft portion at least partially enters the interior of the outer cover portion, and the disk portion is located on the proximal end side of the first stepped surface. The outer diameter of the shaft portion is smaller than the inner diameter of the first stepped surface, and the inner diameter of the first stepped surface is smaller than the outer diameter of the disk portion.

[0021] In some embodiments, a closing return spring is provided between the proximal end side of the connecting rod and the shaft portion. When the second closing part moves in the proximal end side direction of the stapler, the closing return spring is compressed toward the proximal end by the shaft portion.

[0022] In some embodiments, the shaft portion includes a first shaft portion and a second shaft portion. The first shaft portion is connected between the second shaft portion and the disk portion. The outer diameter of the first shaft portion is smaller than the outer diameter of the second shaft portion. The first shaft portion at least partially enters the interior of the outer cover portion. A second stepped surface is provided between the first shaft portion and the second shaft portion. The closing return spring is provided between the second stepped surface and the proximal end side of the connecting rod.

[0023] In some embodiments, a through hole is provided in the second shaft portion, a connecting pin is drilled in the through hole, and the connecting pin is simultaneously drilled in the proximal end side of the connecting rod and the proximal end side of the closing pull tab.

[0024] In some embodiments, a pin groove extending along the axial direction is provided on the proximal end side of the connecting rod. The connecting pin is at least partially located in the pin groove and is movable along the extending direction of the pin groove.

[0025] In some embodiments, a first concave groove is provided on the distal end side of the driving portion of the second closing part. The second pivoting portion at least partially enters the first concave groove, or The second pivoting portion is provided with a first concave groove, and the distal end side of the driving portion of the second closing portion at least partially enters into the first concave groove. In some embodiments, the closing drive mechanism includes a switching drive member, includes a first position region and a second position region, and an operating lever where the second position region is located on the distal end side of the first position region, and further includes a closing pull tab fixedly connected to the closing pull rod assembly at the proximal end side. When the link assembly is in the second state and the operating lever moves from the second position region to the first position region, the switching drive member presses the link assembly in a direction away from the operating lever, whereby the link assembly enters the first state, the third pivoting portion and the fourth pivoting portion move in a direction away from the operating lever, and the second pivoting portion moves the closing pull tab in the direction of the distal end side of the stapler by the closing pull rod assembly.

[0026] In some embodiments, the link assembly further includes a drive button, the drive button is attached to the first rod or the second rod, and the first end of the drive button protrudes from the surface of the first rod or the second rod on the side facing the operating lever. When the link assembly is in the second state and the operating lever moves from the second position region to the first position region, the switching drive member presses the first end of the drive button in a direction away from the operating lever.

[0027] In some embodiments, when the link assembly is in the second state and the operating lever moves from the first position region to the second position region, the first rod does not rotate relative to the second rod. When the link assembly is in the second state and the operating lever moves from the second position region to the first position region, the first rod is pivotally rotatable relative to the second rod.

[0028] In some embodiments, when the link assembly is in the second state and the operating lever moves from the first position region to the second position region, the switching drive member drives the first end of the drive button to move in the distal end side direction without preventing the movement of the operating lever.

[0029] In some embodiments, a mounting groove is provided on a surface of the first rod or the second rod on a side facing the operating lever, and the drive button is mounted in the mounting groove.

[0030] In some embodiments, the mounting groove includes a first side wall, a second side wall, and a bottom wall. The first side wall of the mounting groove is located on the distal end side of the second side wall. There is a first gap between the drive button and the first side wall of the mounting groove. When the link assembly is in the first state, the drive button abuts against the second side wall of the mounting groove. When the link assembly is in the second state and the operating lever moves from the first position region to the second position region, the drive button moves toward the first side wall of the mounting groove.

[0031] In some embodiments, the link assembly further includes an elastic member. The elastic member is mounted between the drive button and the first side wall, so that the drive button tends to approach the second side wall. When the drive button moves toward the first side wall, the drive button presses the elastic member to generate elastic deformation.

[0032] In some embodiments, the elastic member is an elastic sheet. A first end of the elastic sheet is connected to a side of the drive button facing the second side wall of the mounting groove. A bent portion is provided at a second end of the elastic sheet. A stopper groove is opened in the second side wall of the mounting groove, and the bent portion of the elastic sheet enters the stopper groove.

[0033] In some embodiments, the second end of the driving button is pivotally connected to the bottom wall of the mounting groove. At least a part of the outer wall of the second end of the driving button is a first arc surface, at least a part of the bottom wall of the mounting groove is a second arc surface, the first arc surface is in close contact with the second arc surface, and the first arc surface is rotatable relative to the second arc surface.

[0034] In some embodiments, the switching drive member is a rack installed on one side of the link assembly of the operating lever facing the link assembly.

[0035] In some embodiments, the driving button is installed on at least one side of the first rod, the driving button is rotatably connected to the side wall of the first rod, and the switching drive member is a driving tooth installed on at least one side of the operating lever.

[0036] In some embodiments, a stopper portion is further installed on the first rod, the stopper portion is located on the proximal end side of the driving button, and the stopper portion prevents the movement of the proximal end side of the second end of the driving button in the proximal end side direction.

[0037] In some embodiments, the third pivoting portion is pivotally connected to the fourth pivoting portion by a pin shaft, the driving button is installed on the third pivoting portion, and the first end of the driving button is rotatable around the pin shaft in the distal end side direction.

[0038] In some embodiments, the driving tooth includes a first side wall and a second side wall, the first side wall of the driving tooth is located on the distal end side of the second side wall, the first side wall of the driving tooth is a vertical surface, and the second side wall of the driving tooth is a guide surface.

[0039] In some embodiments, the closing drive mechanism A connecting rod extending along the axial direction of the stapler, A closing pull tab, at least a part of which is located inside the connecting rod and can move axially with respect to the connecting rod, and a first position restricting portion is fixedly installed on the proximal end side. A reset button that is located on the proximal end side of the connecting rod, at least partially enters the inside of the connecting rod, can move axially with respect to the connecting rod, and drives the closing pull tab to move in the distal end side direction of the stapler when driven to move in the distal end side direction of the stapler.

[0040] In some embodiments, the stapler includes a stapler body, the closing drive mechanism further includes a second position restricting portion, the second position restricting portion is located on the proximal end side of the first position restricting portion and is axially fixed to the housing of the stapler body. When the reset button is driven to move in the distal end side direction of the stapler, it abuts against the first position restricting portion, and when the reset button is driven to move in the proximal end side direction of the stapler, it is position-restricted by the second position restricting portion.

[0041] In some embodiments, a second position restricting portion engaging portion is provided on the stapler body, and the second position restricting portion is rotatably provided on the second position restricting portion engaging portion.

[0042] In some embodiments, the second position restricting portion engaging portion is a circumferential groove provided on the housing, the second position restricting portion is a first connecting pin movably provided on the reset button, and the first connecting pin is rotatably provided in the circumferential groove.

[0043] In some embodiments, the closing drive mechanism further includes an annular fixing member, the first connecting pin is fixedly connected to the fixing member, and the fixing member is rotatably provided in the circumferential groove.

[0044] In some embodiments, the reset button at least partially enters the interior of the fixing member, and the reset button is axially movable relative to the fixing member.

[0045] In some embodiments, the reset button includes a reset engaging portion and an operating portion located on the proximal end side of the reset engaging portion. The operating portion is located on the proximal end side of the second position restricting portion. The second position restricting portion is formed through the reset engaging portion, and the reset engaging portion is axially movable relative to the second position restricting portion along the axial direction of the stapler.

[0046] In some embodiments, a slide groove extending axially is provided on the side surface of the reset engaging portion. The first connecting pin at least partially enters the slide groove and is movable along the extending direction of the slide groove.

[0047] In some embodiments, the slide groove does not communicate with the distal end and the proximal end of the reset engaging portion.

[0048] In some embodiments, a first biasing member is provided between the reset engaging portion and the first connecting pin. The first biasing member applies a biasing force to the reset engaging portion in the direction of the distal end side of the stapler.

[0049] In some embodiments, the first biasing member is a first return spring. There is a cavity inside the reset engaging portion, and the first return spring is installed inside the cavity. One end of the first return spring abuts against the distal end of the cavity, and the second end of the first return spring abuts against the first connecting pin.

[0050] In some embodiments, the first position restricting portion is a second connecting pin. The second connecting pin is formed through the proximal end side of the closing pull tab. The reset engaging portion is located on the proximal end side of the second connecting pin.

[0051] When the reset button is driven to move in the distal end direction of the stapler, the distal end face of the reset engaging portion abuts against the second connecting pin, and drives the closing pull tab to move in the distal end direction of the stapler.

[0052] In some embodiments, the closing drive mechanism further includes a closing pull rod assembly. The closing pull rod assembly includes a sleeve portion. The sleeve portion is sleeved outside the connecting rod and is axially movable relative to the connecting rod. The sleeve portion and the proximal end side of the closing pull tab are fixedly connected by the second connecting pin. A second biasing member is further installed between the sleeve portion and the second position restricting portion. The second biasing member applies a biasing force to the sleeve portion in the distal end direction of the stapler.

[0053] An embodiment of the present invention further provides a medical stapler, which includes the above-mentioned closing drive mechanism.

[0054] The closing drive mechanism and the medical stapler provided by the present invention have the following advantages.

[0055] The present invention provides a closing drive mechanism for a stapler, which directly realizes the transmission between the firing handle and the closing pull rod assembly through a link assembly. When it is necessary to close the staple head portion, the firing handle is gripped. The firing handle drives the closing drive mechanism through the link assembly to move proximally, and further pulls the closing pull tab to move proximally to close the staple head portion. The structure is simple, effectively realizes the closing control of the staple head portion, and can maintain the closing stability of the staple head portion by the link assembly.

Brief Description of the Drawings

[0056] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

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Embodiments for Carrying Out the Invention

[0057] Next, exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, the same reference numerals denote the same or similar structures, and thus, duplicate descriptions will be omitted.

[0058] The present invention provides a closing drive mechanism used in a medical stapler and a stapler including the closing drive mechanism. The stapler further includes a staple head portion and a stapler body. The staple head portion is installed on the distal end side of the stapler body. A closing pull tab for closing the staple head portion is installed on the stapler body, and the distal end side of the closing pull tab is connected to the staple head portion. The closing drive mechanism is a link assembly including a first pivot portion and a second pivot portion. The first pivot portion is pivotally connected to the stapler body, and the second pivot portion is located on the proximal end side of the first pivot portion. The link assembly has a first state and a second state, a firing handle including a first engaging portion, and a closing pull rod assembly pivotally connected to the second pivot portion of the link assembly. Here, when the link assembly is in the first state and the firing handle rotates along a first direction, the first engaging portion drives the link assembly to enter the second state. The second pivot portion of the link assembly moves in the proximal end side direction of the stapler, and drives the closing pull rod assembly to move in the proximal end side direction of the stapler. The closing pull rod assembly is connected to the closing pull tab. When the closing pull rod assembly moves in the proximal end side direction, it drives the closing pull tab to move in the proximal end side direction, thereby realizing the closing of the staple head portion.

[0059] Therefore, the present invention directly realizes the transmission between the firing handle and the closing pull rod assembly by the link assembly. When it is necessary to close the staple head portion, the firing handle is grasped. The firing handle drives the closing drive mechanism by the link assembly to move it to the proximal end side, further pulls the closing pull tab to move it to the proximal end side to close the staple head portion. The structure is simple and effectively realizes the closing control of the staple head portion.

[0060] Hereinafter, with reference to the drawings, the structure of the closing drive mechanism of each specific embodiment of the present invention will be described in detail. It should be noted that each specific embodiment does not limit the protection scope of the present invention.

[0061] As shown in FIGS. 1 to 12, the first embodiment of the present invention provides a closing drive mechanism used in a medical stapler and a stapler including the closing drive mechanism. As shown in FIG. 1, the stapler includes a staple head portion 9, a stapler body 1, and the closing drive mechanism. The staple head portion 9 is installed on the distal end side of the stapler body 1. As shown in FIGS. 2 and 3, the staple head portion 9 includes an anvil 91 and a staple cartridge assembly 92 installed opposite to each other. The anvil 91 has a third state opened with respect to the staple cartridge assembly 92 and a fourth state closed with respect to the staple cartridge assembly 92. A first engaging groove 911 is installed on the proximal end side of the anvil 91 in an inclined manner, and a second engaging groove 921 is installed on the proximal end side of the staple cartridge assembly 92. The second engaging groove 921 is a groove extending along the axial direction of the stapler. A closing pin 93 is simultaneously inserted into the first engaging groove 911 and the second engaging groove 921. When the closing pin 93 is located on the distal end side of the second engaging groove 921, the anvil 91 is in the third state. When the closing pin 93 moves from the distal end side to the proximal end side of the second engaging groove 921, the anvil 91 enters the fourth state. When the anvil 91 is in the fourth state, the anvil 91 and the staple cartridge assembly 92 clamp the tissue. The process of the anvil 91 entering from the third state to the fourth state is called the closing process of the staple head portion 9, that is, the closing process of the stapler. A closing pull tab 12 for closing the staple head portion 9 is installed on the stapler body 1. The distal end side of the closing pull tab 12 is connected to the closing pin 93. When the closing pull tab 12 moves to the proximal end side, the closing pin 93 can be pulled to move to the proximal end side, thereby realizing the closing of the staple head portion 9.

[0062] In the present invention, with respect to the operator, the proximal end side is the end closer to the operator, and the distal end side is the end farther from the operator, that is, the end closer to the surgical position. The direction along the axis of the stapler is the axial direction, that is, the direction from the distal end side of the stapler to the proximal end side, or the direction from the proximal end side of the stapler to the distal end side. For example, from the perspective of FIG. 1, for the stapler, the distal end side is on the left side and the proximal end side is on the right side. The S1 direction in FIG. 1 is the direction from the distal end side of the stapler to the proximal end side. The S1 direction or the direction opposite to the S1 direction is defined as the axial direction of the stapler. The S2 direction in FIG. 5 is defined as the longitudinal direction, that is, the height direction.

[0063] As shown in FIG. 4, the stapler body 1 further includes a housing 13, a fixed handle 11, a connecting rod 18 extending along the axial direction, and an operating lever 2 sleeved on the connecting rod 18. The closing pull tab 12 is installed inside the connecting rod 18, and the closing pull tab 12 can move axially relative to the connecting rod 18. The connecting rod 18 is a hollow tubular rod, and its distal end side is connected to the staple head portion. A rack 21 is installed on one side of the operating lever 2. The closing drive mechanism includes a link assembly 4, a firing handle 3, and a closing pull rod assembly 5. The firing handle 3 is movably connected to the stapler body 1 and can move relative to the fixed handle 11. FIG. 4 shows the initial position of the firing handle 3. When the firing handle 3 is not gripped, the firing handle 3 is located at an initial position away from the fixed handle 11. When the firing handle 3 is gripped, the firing handle 3 moves toward the fixed handle 11 along the first direction (the S3 direction in FIG. 6, which is counterclockwise in the viewing angle of FIG. 6). After the staple head portion reaches the surgical site, by gripping the firing handle 3, the closing drive mechanism drives the closing pull tab 12 to move in the proximal end side direction, and further closes the staple head portion to clamp the tissue. A locking claw 31 is installed at one end of the firing handle 3 that enters the stapler body 1, and the locking claw 31 can engage with the rack 21. After the staple head portion is closed, the firing handle 3 is gripped again. The firing handle 3 moves toward the fixed handle 11, and the locking claw 31 drives the rack 21 to move the operating lever 2 in the distal end side direction. The operating lever 2 drives a push rod, and the push rod drives a cutter and a firing block in the staple head portion, thereby firing the stapler. A handle return spring 15 is further installed in the stapler body 1. When the firing handle 3 is gripped, the handle return spring 15 is compressed to generate elastic deformation.Loosen the firing handle 3, and the firing handle 3 can move away from the fixed handle 11 under the action of the deformation restoring force of the handle return spring 15, and further return to its initial position.

[0064] As shown in FIGS. 5 to 8, the link assembly 4 includes a first pivot portion 412, a second pivot portion 422, and a second engagement portion 411. The first pivot portion 412 is pivotally connected to the housing 13 of the stapler body 1, that is, the first pivot portion 412 only rotates relative to the stapler body 1 and does not move axially. In the axial direction, the first pivot portion 412 is held at a relatively fixed position. The second pivot portion 422 is located on the proximal end side of the first pivot portion 412, and the link assembly 4 has a first state and a second state. When the link assembly 4 is in the first state, the second pivot portion 422 is in a third position region. When the link assembly 4 is in the second state, the second pivot portion 422 is in a fourth position region. The second position region is on the proximal end side of the third position region. That is, in the process of the link assembly 4 changing from the first state to the second state, the second pivot portion 422 moves in the proximal end side direction of the stapler and moves from the third position region to the fourth position region. The firing handle 3 further includes a first engagement portion 32, and the first engagement portion 32 is a protrusion structure installed on one side of the firing handle 3 facing the link assembly 4. The closing pull rod assembly 5 is pivotally connected to the second pivot portion 422 of the link assembly 4.

[0065] In the initial state, the link assembly 4 is in the first state, and the firing handle 3 is in the initial position shown in FIG. 5. When the link assembly 4 is in the first state and the firing handle 3 rotates along the S3 direction, the first engaging portion 32 is driven by the second engaging portion 411 to cause the link assembly 4 to enter the second state. The second pivot portion 422 of the link assembly 4 moves in the proximal end side direction of the stapler and drives the closing pull rod assembly 5 to move in the proximal end side direction of the stapler. The closing pull rod assembly 5 is connected to the closing pull tab 12. When the closing pull rod assembly 5 moves in the proximal end side direction, it drives the closing pull tab 12 to move in the proximal end side direction, thereby realizing the closing of the staple head portion 9.

[0066] The link assembly 4 is an assembly formed by connecting two or more rod-shaped members to each other by a rotary pair. In this embodiment, an example will be described in which the link assembly 4 includes two rod-shaped members. Specifically, as shown in FIGS. 5 to 8, the link assembly 4 includes a first rod 41 and a second rod 42, and the second rod 42 is located on the proximal end side of the first rod 41. The first rod 41 includes the first pivoting portion 412, the second engaging portion 411, and the third pivoting portion 413, and the second engaging portion 411 is located on one side of the first rod 41 close to the firing handle 3. Specifically, the first pivoting portion 412 of the first rod 41 is pivotally connected to the housing 13 of the stapler body 1 by a first pin shaft 43. The first rod 41 is a triangular rod, and the first pivoting portion 412 and the third pivoting portion 413 are respectively installed at the first angular position and the second angular position of the triangular rod. The second engaging portion 411 is installed at the third angular position of the triangular rod. The structure of the triangular rod can make the engagement between the first rod 41 and the firing handle 3 more stable. At the same time, the outer surface of the second engaging portion 411 is an arc-shaped surface. When the first engaging portion 32 of the firing handle 3 drives the rotation of the first rod 41 by the second engaging portion 411, there is always a relatively large engaging contact surface between the first engaging portion 32 and the second engaging portion 411, avoiding the situation where locking occurs. In other alternative embodiments, the first rod 41 may use other shapes, for example, a straight rod, an arc-shaped rod, a trapezoidal rod, a rhombic rod, etc.

[0067] The second rod 42 includes the second pivoting portion 422 and the fourth pivoting portion 423, and the third pivoting portion 413 is pivotally connected to the fourth pivoting portion 423. Specifically, the second rod 42 is a straight rod, and the second pivoting portion 422 and the fourth pivoting portion 423 are respectively installed at the first end and the second end of the second rod 42. In other alternative embodiments, the second rod 42 may use other shapes, for example, a triangular rod, an arc-shaped rod, a trapezoidal rod, a rhombic rod, etc. The third pivoting portion 413 is pivotally connected to the fourth pivoting portion 423 via a second pin shaft 44, and the second pivoting portion 422 is pivotally connected to the closing pull rod assembly 5 via a third pin shaft 45. In this embodiment, the third pivoting portion 413 includes a concave groove, and the fourth pivoting portion 423 at least partially enters the concave groove of the third pivoting portion 413. In another alternative embodiment, the fourth pivoting portion 423 includes a concave groove, and the third pivoting portion 413 at least partially enters the concave groove of the fourth pivoting portion 423.

[0068] As shown in FIG. 6, when the firing handle 3 rotates along the S3 direction, the first rod 41 is driven to rotate along the S3 direction by rotating around the first pin shaft 43, and the second rod 42 rotates along the second direction, that is, the S4 direction, with respect to the first rod 41. The S4 direction is opposite to the S3 direction, and in the perspective view of FIG. 6, the S4 direction is clockwise. FIGS. 5 and 6 show the engagement structure between the link assembly 4 and other members in the first state. At this time, the third pivoting portion 413 and the fourth pivoting portion 423 are at positions relatively far from the connecting rod 18, and an included angle a1 is formed between the first rod 41 and the second rod 42. The axial distance between the center of the second pivoting portion 422 and the center of the first pivoting portion 412 is L1, and the link assembly 4 is in an axially compact state. At this time, the outer surface of the second engaging portion 411 of the first rod 41 abuts against the first engaging portion 32 of the firing handle 3. The link assembly 4 is in a relatively stable state, and it can be ensured that the state of the link assembly 4 does not change when the firing handle 3 is not gripped, and the closing pull rod assembly 5 can be well held in its initial position.

[0069] As shown in FIGS. 6, 9, and 10, the closing pull rod assembly 5 includes a connected sleeve portion 51 and a driving portion 52. The sleeve portion 51 is sleeved outside the connecting rod 18, and the driving portion 52 is pivotally connected to the second pivoting portion 422. An engaging hole 522 is provided on the distal end side of the driving portion 52, and the engaging hole 522 is used for drilling the third pin shaft 45. A through hole 511 is provided on the proximal end side of the sleeve portion 51, and the proximal end side of the sleeve portion 51 and the proximal end side of the closing pull tab 12 are fixedly connected via a connecting pin 53. When the driving portion 52 moves in the proximal end side direction, the sleeve portion 51 and the connecting pin 53 drive the closing pull tab 12 to move in the proximal end side direction. A fixing member 14 is further provided on the proximal end side of the connecting rod 18. The fixing member 14 is located on the proximal end side of the sleeve portion 51, and a closing return spring 6 is provided between the sleeve portion 51 and the fixing member 14. The closing return spring 6 may be, for example, a compression spring. When the sleeve portion 51 moves in the proximal end side direction, the closing return spring 6 is compressed by the sleeve portion 51 to generate elastic deformation. After the firing of the stapler is completed, when the staple head portion opens, the closing return spring 6 applies a driving force in the distal end side direction to the sleeve portion 51, driving the sleeve portion 51 back to its initial position. In other alternative embodiments, the closing return spring 6 may be another type of spring, such as a tension spring or the like.

[0070] As shown in FIG. 10, in this embodiment, on the inner surface of the housing 13, a guide groove 131 extending along the axial direction is provided. On the driving part 52 of the closing pull rod assembly 5, a guide part 521 is provided. The guide part 521 is a ridge extending along the axial direction. The guide part 521 at least partially enters the guide groove 131 and can move along the extending direction of the guide groove 131, thereby further restricting the driving part 52 to move only along the axial direction. In other alternative embodiments, a guide part may be provided on the inner surface of the housing 13, and a guide groove extending along the axial direction may be provided on the driving part 52 of the closing pull rod assembly 5. The guide part at least partially enters the guide groove and can move along the extending direction of the guide groove. The guide part provided on the driving part 52 of the closing pull rod assembly 5 or the inner surface of the housing 13 may be a single ridge, or a single bump, boss, etc. On the inner surfaces of the housings 13 on both sides, one of the guide grooves or guide parts may be respectively provided. Correspondingly, on both sides of the driving part 52, one of the guide parts or guide grooves may be respectively provided. In other alternative embodiments, only one of the guide grooves or guide parts may be provided on the inner surface of only one side of the housing 13, and one of the guide parts or guide grooves may be provided on the side of the driving part 52 opposite thereto.

[0071] As described above, when the link assembly 4 is in the first state and the firing handle 3 is gripped and rotated in the S3 direction, the first rod 41 rotates along the S3 direction around the first pin shaft 43, and the second rod 42 rotates along the S4 direction with respect to the first rod 41. Thereby, the link assembly 4 enters the second state. FIGS. 11 and 12 show the structure of the link assembly 4 in the second state of this embodiment.

[0072] As shown in FIG. 11, after the link assembly 4 enters the second state from the first state, the third pivot portion 413 and the fourth pivot portion 423 move in a direction approaching the connecting rod 18 as compared to the first state, that is, they move to a position relatively approaching the connecting rod 18 upward in the perspective of FIG. 11. At this time, the link assembly 4 is in a relatively stable second state. The included angle between the first rod 41 and the second rod 42 is a2, and the included angle a2 is larger than the included angle a1 in the first state shown in FIG. 6. In another embodiment, in the process of the first state entering the second state, after the included angle a1 in the first state gradually increases to 180°, it can also continue to move to the included angle a2 in the direction of the connecting rod 18. The axial distance between the center of the first pivot portion 412 and the center of the second pivot portion 422 is L2, and the distance L2 is larger than the distance L1 in the first state shown in FIG. 6, and the link assembly 4 is in a relatively expanded state axially. Since the first pivot portion 412 cannot be displaced axially with respect to the housing 13 of the stapler body 1, the second pivot portion 422 moves in the proximal end side direction, driving the closing pull rod assembly 5 to move in the proximal end side direction. The sleeve portion 51 compresses and deforms the closing return spring 6, and the closing pull rod assembly 5 pulls the closing pull tab 12 to move in the proximal end side direction, thereby realizing the closing of the staple head portion. At this time, since the second state of the link assembly 4 is a more stable state, even if the firing handle 3 is loosened, the firing handle 3 is reset to its initial position by the action of the handle return spring 15, and the link assembly 4 can still be held in the second state.

[0073] As shown in FIG. 12, in this embodiment, a protrusion 421 is provided on the fourth pivoting portion 423. When the link assembly 4 is in the second state, the protrusion 421 abuts against the outer wall of the concave groove, preventing the second rod 42 from continuously rotating along the second direction with respect to the first rod 41, and ensuring that the third pivoting portion 413 and the fourth pivoting portion 423 do not continuously move in the direction approaching the connecting rod 18, thereby ensuring the stability of the second state.

[0074] In other alternative embodiments, the fourth pivoting portion 423 may include a concave groove, and the third pivoting portion 413 at least partially enters the concave groove of the fourth pivoting portion 423. A protrusion is provided on the third pivoting portion 413. When the link assembly 4 is in the second state, the protrusion abuts against the outer wall of the concave groove, preventing the second rod 42 from continuously rotating along the second direction with respect to the first rod 41, and ensuring the stability of the second state.

[0075] Therefore, the link assembly 4 of the present invention has two stable first states and a second state. When the stapler is in the initial state, the firing handle 3 is in an initial position away from the fixed handle 11, and the link assembly 4 is in a stable first state. When the firing handle 3 is not gripped, the stability of the entire closing drive mechanism can be ensured, and the closing pull tab 12 also does not move axially. When it is necessary to close the stapler, grip the firing handle 3, rotate the firing handle 3 toward the fixed handle 11, drive the link assembly 4 to enter the second state, and hold it in the stable second state. At this time, by driving the closing pull tab 12 to move in the proximal end direction, the staple head portion of the stapler can be closed. In this state, continue to grip the firing handle 3, and by engaging the locking claw 31 of the firing handle 3 with the rack 21 of the operating lever 2, the push rod inside the stapler body 1 can be driven to drive the staple head portion to complete the firing of the stapler. Moreover, during the firing process of the stapler, the link assembly 4 can always be stably held in the second state, and it can be ensured that the closing pull tab 12 does not move in the distal end direction, improving the surgical effect.

[0076] Figures 13 to 27 show the structure of the closing drive mechanism according to the second embodiment of the present application. During the operation, the head portion of the stapler should be able to rotate flexibly relative to the body portion of the stapler to meet the complex surgical situation. The second embodiment provides a simple and effective solution. When the doctor operates the stapler body, the head portion of the stapler can flexibly achieve a 360-degree rotation, providing more convenience for the doctor. In the second embodiment, when the connecting rod rotates around its central axis, the synchronous rotation of the staple head portion can be driven, realizing the rotation of the staple head portion around the central axis of the connecting rod.

[0077] Meanwhile, in the second embodiment, the closing pull rod assembly includes a first closing portion and a second closing portion. The first closing portion surrounds the outside of the connecting rod. The first closing portion is connected to the proximal end side of the connecting rod and the proximal end side of the closing pull tab respectively. The second closing portion is at least partially sleeved outside the first closing portion, and the first closing portion can rotate around the central axis of the connecting rod relative to the second closing portion.

[0078] Here, the first closing portion and the closing pull tab are fixed opposite to each other in the axial direction of the stapler. When the second closing portion moves in the proximal end side direction of the stapler, the first closing portion drives the closing pull tab to move in the proximal end side direction, so as to realize the closing of the staple head portion of the stapler. The first closing portion, the closing pull tab and the connecting rod are fixed opposite to each other in the circumferential direction of the connecting rod. When the connecting rod rotates around the central axis of the connecting rod, the closing pull tab and the first closing portion are driven to rotate around the central axis of the connecting rod. Thus, when the staple head portion is driven to rotate by the connecting rod, the closing pull tab and the first closing portion rotate synchronously, and the second closing portion does not rotate, so that the failure of the closing drive mechanism can be avoided. Therefore, when the connecting rod rotates, the closing pull tab and the first closing portion are driven to rotate together at the same time. The rotation of the connecting rod can realize the rotation of the staple head portion, and since the first closing portion can rotate relative to the second closing portion, when the first closing portion rotates, the second closing portion can still be held from rotating, without causing the failure of the closing drive mechanism, and the staple head portion can realize a 360° rotation.

[0079] As shown in FIGS. 13 to 27, the second embodiment provides a closing drive mechanism used in a medical stapler and a stapler including the closing drive mechanism. The main difference between the second embodiment and the first embodiment is as follows. The structure of the closing pull rod assembly 50 according to the second embodiment is different from that of the closing pull rod assembly 5 according to the first embodiment. As shown in FIGS. 13 and 14, the stapler includes a staple head portion 9, a stapler body 1, and the closing drive mechanism. The staple head portion 9 is installed on the distal end side of the stapler body. The closing drive mechanism includes a connecting rod 18, a closing pull tab 12, and a closing pull rod assembly 5. As shown in FIG. 13, the staple head portion 9 includes an anvil 91 and a staple cartridge assembly 92 installed opposite to each other. The anvil 91 has a third state in which it is open with respect to the staple cartridge assembly 92 and a fourth state in which it is closed with respect to the staple cartridge assembly 92. The structure and principle of driving the closing of the staple head portion 9 by the closing pull tab 12 are the same as those of the first embodiment, and the description thereof is omitted here.

[0080] As shown in FIGS. 13 and 14, the connecting rod 18 extends along the axial direction of the stapler. The connecting rod 18 at least partially enters the housing 13 of the stapler body 1. The distal end side of the connecting rod 18 is connected to the staple head portion 9. When the connecting rod 18 rotates along the S5 direction around its central axis S0, the staple head portion can be driven to rotate synchronously, realizing the rotation of the staple head portion 9 along the S5 direction around the central axis S0 of the connecting rod 18, and further realizing the rotation of the staple head portion 9 within an angular range of 360° with respect to the central axis S0 of the connecting rod 18.

[0081] As shown in FIGS. 15 to 17, the closing pull tab 12 extends along the axial direction of the stapler and is at least partially located inside the connecting rod 18. The closing pull rod assembly 50 includes a first closing portion 501 and a second closing portion 502. The first closing portion 501 surrounds the outside of the connecting rod 18. The first closing portion 501 is connected to the proximal end side of the connecting rod 18 and the proximal end side of the closing pull tab 12 respectively. The second closing portion 502 is at least partially sleeved outside the first closing portion 501, and the first closing portion 501 can rotate around the central axis of the connecting rod 18 relative to the second closing portion 502.

[0082] Here, the first closing portion 501 and the closing pull tab 12 are fixed opposite to the axial direction of the stapler. When the second closing portion 502 moves in the proximal end side direction of the stapler, the first closing portion 501 drives the closing pull tab 12 to move in the proximal end side direction, so that the closing of the staple head portion of the stapler can be realized. The first closing portion 501, the closing pull tab 12 and the connecting rod 18 are fixed opposite to the circumferential direction of the connecting rod 18. When the connecting rod 18 rotates around the central axis of the connecting rod 18, the closing pull tab 12 and the first closing portion 501 are driven to rotate around the central axis of the connecting rod 18. Thus, when the staple head portion is driven to rotate by the connecting rod 18, the closing pull tab 12 and the first closing portion 501 can rotate synchronously, and the second closing portion 502 does not rotate, so that the failure of the closing drive mechanism can be avoided.

[0083] As shown in FIGS. 15 to 17, in this embodiment, the closing drive mechanism further includes a transmission assembly and a firing handle 3. The transmission assembly can realize the transmission between the firing handle 3 and the second closing part 502. In this embodiment, the transmission assembly is a link assembly 4, specifically, an assembly formed by connecting two or more rod-shaped members to each other by a rotary pair. As shown in FIG. 15, the stapler body 1 includes a housing 13, a fixed handle 11, and an operating lever 2 sleeved on a connecting rod 18. The closing pull tab 12 is installed inside the connecting rod 18. A rack 21 is installed on one side of the operating lever 2. The firing handle 3 is movably connected to the stapler body 1 and can move relative to the fixed handle 11. FIG. 15 shows the initial position of the firing handle 33. When the firing handle 3 is gripped, the firing handle 3 moves along the S3 direction toward the fixed handle 11. The firing handle 3 drives the closing pull rod assembly 50 to move in the proximal end direction by the link assembly 3, thereby closing the staple head part to clamp the tissue. A locking claw 31 is installed at one end of the firing handle 3 that enters the stapler body 1, and the locking claw 31 can engage with the rack 21. After the staple head part is closed, grip the firing handle 3 again, drive the rack 21 by the locking claw 31 to move the operating lever 2 in the distal end direction, drive the push rod located in the stapler body 1, and the push rod drives the cutter and the firing block in the staple head part to realize the firing of the stapler. A handle return spring 15 is further installed in the stapler body 1, and its function is the same as that of the handle return spring 15 in the first embodiment.

[0084] As shown in FIGS. 15 to 17, the link assembly 4 includes a first pivot portion 412 and a second pivot portion 422. The first pivot portion 412 is pivotally connected to the stapler body 1. The second pivot portion 422 is located on the proximal end side of the first pivot portion 412, and the second pivot portion 422 is pivotally connected to the second closing portion 502. The link assembly 4 has a first state shown in FIG. 16 and a second state shown in FIG. 17. The firing handle 3 includes a first engaging portion 32. In this embodiment, the link assembly 4 includes a first rod 41 and a second rod 42. The second rod 42 is located on the proximal end side of the first rod 41. The first rod 41 includes the first pivot portion 412, a third pivot portion 413, and an engaging portion. The second rod 42 includes the second pivot portion 422 and a fourth pivot portion 423. The third pivot portion 413 is pivotally connected to the fourth pivot portion 423. When the link assembly 4 is in the first state, the axial distance between the center of the first pivot portion 412 and the center of the second pivot portion 422 is L1. At this time, the third pivot portion 413 and the fourth pivot portion 423 are located relatively far from the connecting rod 18, and an included angle a1 is formed between the first rod 41 and the second rod 42. The outer surface of the second engaging portion 411 of the first rod 41 abuts against the first engaging portion 32 of the firing handle 3. The link assembly 4 is in a relatively stable state, and when the firing handle 3 is not gripped, it can be ensured that the state of the link assembly 4 does not change, and the closing pull rod assembly 50 can be well held in its initial position. The link assembly 4 is in an axially compact state. A fixing member 14 is installed on the proximal end side of the connecting rod 18. A closing return spring 6 is installed between the closing drive mechanism and the fixing member 14. The closing return spring 6 may be, for example, a compression spring.

[0085] When the link assembly 4 is in the first state shown in FIG. 16 and the firing handle 3 rotates along the S3 direction, the first rod 41 rotates around the first pin shaft 43 along the first direction (S3 direction), and the second rod 42 rotates along the second direction (S4 direction) with respect to the first rod 41, whereby the link assembly 4 enters the second state shown in FIG. 17. The second direction is opposite to the first direction. In the perspective view of FIG. 16, the first direction (S3 direction) is the counterclockwise direction, and the second direction (S4 direction) is the clockwise direction. As shown in FIG. 17, the third pivoting portion 413 and the fourth pivoting portion 423 move in a direction approaching the connecting rod 18 compared to the first state, that is, move to a position relatively approaching the connecting rod 18 upward in the perspective view of FIG. 17. At this time, the link assembly 4 is in a relatively stable second state. The included angle between the first rod 41 and the second rod 42 is a2, and the included angle a2 is larger than the included angle a1 in the first state shown in FIG. 16. The distance between the center of the first pivoting portion 412 and the center of the second pivoting portion 422 is L2, and the distance L2 is larger than the distance L1 in the first state shown in FIG. 16, and the link assembly 4 is in a relatively expanded state in the axial direction. Since the first pivoting portion 412 cannot be displaced axially with respect to the housing 13 of the stapler body 1, the second pivoting portion 422 moves in the proximal end side direction, drives the second closing portion 502 of the closing pull rod assembly 50 to move in the proximal end side direction, the closing pull rod assembly 50 compresses and deforms the closing return spring 6, and the second closing portion 502 can pull the closing pull tab 12 by the first closing portion 501 to move in the proximal end side direction, thereby realizing the closing of the staple head portion.

[0086] Figures 19 and 20 respectively show the engagement structures with the second closing portion 502 in the first state and the second state of the link assembly 4. As shown in Figures 19 and 20, the first pivoting portion 412 of the first rod 41 is pivotally connected to the housing 13 of the stapler body 1 via a first pin shaft 43. The third pivoting portion 413 is pivotally connected to the fourth pivoting portion 423 via a second pin shaft 44, and the second pivoting portion 422 is pivotally connected to the first engaging portion 32 via a third pin shaft 45. The specific shapes and structures of the first rod 41 and the second rod 42 are the same as those in the first embodiment, and the description thereof is omitted here. Therefore, the link assembly 4 of the present invention has two stable first states and second states. When the stapler is in the initial state, the firing handle 3 is in an initial position away from the fixed handle 11, and the link assembly 4 is in a stable first state. When the firing handle 3 is not gripped, the stability of the entire closing drive mechanism can be ensured, and the closing pull tab 12 also does not move axially. When it is necessary to close the stapler, grip the firing handle 3, rotate the firing handle 3 towards the fixed handle 11, drive the link assembly 4 to enter the second state, and hold it in the stable second state. At this time, the stapler staple head portion can be closed by driving the closing pull tab 12 to move in the proximal end side direction. Since the second state of the link assembly 4 is a more stable state, even if the firing handle 3 is loosened, the firing handle 3 is reset to its initial position by the action of the handle return spring 15, and the link assembly 4 can still be held in the second state. In this state, continue to grip the firing handle 3, and by engaging the locking claw 31 of the firing handle 3 with the rack 21 of the operating lever 2, the push rod inside the stapler body 1 can be driven to drive the staple head portion to complete the firing of the stapler. Moreover, during the firing process of the stapler, the link assembly 4 can always be stably held in the second state, and it can be ensured that the closing pull tab 12 does not move in the distal end side direction, improving the surgical effect.

[0087] As shown in FIGS. 20 to 21, in this embodiment, the second closing portion 502 includes a connected outer cover portion 5021 and a driving portion 5022. The outer cover portion 5021 is sleeved outside the first closing portion 501, and the first closing portion 501 can rotate around the central axis of the connecting rod 18 with respect to the outer cover portion 5021. An engaging hole 50222 that engages with the third pin shaft 45 is provided on the distal end side of the driving portion 5022. A first concave groove is provided on the distal end side of the driving portion 5022 of the second closing portion 502, and the engaging hole 50222 is provided on the groove wall of the first concave groove. The second pivoting portion 422 at least partially enters the first concave groove. In other alternative embodiments, a first concave groove may be provided in the second pivoting portion 422, and the distal end side of the driving portion 5022 of the second closing portion 502 at least partially enters the first concave groove.

[0088] As shown in FIG. 14, a guide groove 131 extending along the axial direction is provided on the inner surface of the housing 1313, and a guide portion 50221 is provided on the driving portion 5022 of the closing pull rod assembly 50. As shown in FIGS. 20 and 21, the guide portion 50221 is a ridge extending along the axial direction. The guide portion 50221 at least partially enters the guide groove 131 and can move along the extending direction of the guide groove 131, thereby further restricting the driving portion 5022 from moving only along the axial direction. The driving portion 5022 does not generate a rotational movement with respect to the housing 13, that is, the rotation of the first closing portion 501 does not cause the rotation of the driving portion 5022, and the driving portion 5022 and the link assembly 4 always maintain a relatively stable engagement. In other alternative embodiments, a guide portion may be provided on the inner surface of the housing 13, and a guide groove extending along the axial direction may be provided on the driving portion 5022 of the closing pull rod assembly 50. The guide portion at least partially enters the guide groove and can move along the extending direction of the guide groove. The guide portion provided on the driving portion 5022 of the closing pull rod assembly 50 or the inner surface of the housing 13 may be a ridge, or may be a bump, a boss, etc. One of the guide grooves or guide portions may be respectively provided on the inner surfaces of the housings 13 on both sides. Correspondingly, one of the guide portions or guide grooves is respectively provided on both sides of the driving portion 5022. In other alternative embodiments, only one of the guide grooves or guide portions may be provided on the inner surface of the housing 13 on one side, and one of the guide portions or guide grooves is provided on the corresponding side of the driving portion 5022.

[0089] As shown in FIGS. 21 and 22, a through hole 5011 is provided in the second shaft portion 5014, a connecting pin 503 is formed through the through hole 5011, and the connecting pin 503 is simultaneously formed through the proximal end side of the connecting rod 18 and the proximal end side of the closing pull tab 12. The engagement method between the connecting pin 503 and the closing pull tab 12 is as follows. A hole matching the outer diameter of the connecting pin 503 is provided on the proximal end side of the closing pull tab 12, and the connecting pin 503 is formed through the hole on the proximal end side of the closing pull tab 12. Thus, when the first closing portion 501 moves in the proximal end side direction, it moves in the proximal end side direction by the connecting pin 503. The engagement method between the connecting pin 503 and the connecting rod 18 is as follows. A pin groove 181 extending along the axial direction is provided on the proximal end side of the connecting rod 18, the connecting pin 503 is at least partially located in the pin groove 181, and can move along the extending direction of the pin groove 181. Therefore, when the first closing portion 501 moves in the proximal end side direction, the connecting pin 503 moves axially in the pin groove 181 and does not drive the axial movement of the connecting rod 18. When the link assembly 4 is in the first state, the connecting pin 503 is at the distal end portion of the pin groove 181. When the link assembly 4 changes from the first state to the second state, the connecting pin 503 is driven to move in the proximal end side direction through the second closing portion 502 and the first closing portion 501 in sequence, so that the connecting pin 503 moves to the proximal end portion of the pin groove 181. At the same time, the first closing portion 501 and the closing pull tab 12 form a circumferential fixed connection with the connecting rod 18 through the pin groove 181. That is, when the connecting rod 18 drives the staple head portion to rotate around its central axis, the connecting pin 503 simultaneously drives the closing pull tab 12 and the first closing portion 501 to rotate around the central axis of the connecting rod 18. At this time, the second closing portion 502 does not rotate and maintains a stable engagement with the link assembly 4.

[0090] As shown in FIG. 25, the first closing portion 501 includes a shaft portion and a disk portion 5012. The shaft portion includes a first shaft portion 5013 and a second shaft portion 5014. The first shaft portion 5013 is connected between the second shaft portion 5014 and the disk portion 5012. The disk portion 5012 is located on the proximal end side of the first shaft portion 5013. Referring to the structures of FIGS. 17 and 18, the closing return spring 6 is located between the first closing portion 501 and the fixing member 14. Specifically, as shown in FIGS. 20 and 27, an annular second stepped surface 5015 is provided between the first shaft portion 5013 and the second shaft portion 5014. The closing return spring 6 is provided between the second stepped surface 5015 and the fixing member 14. When the first closing portion 501 is driven to move in the proximal end side direction, the second stepped surface 5015 compresses and deforms the closing return spring 6. As shown in FIGS. 24 to 27, one annular first stepped surface 50211 is installed on the proximal end side of the outer cover portion 5021 of the second closing portion 502. The shaft portion at least partially enters the interior of the outer cover portion 5021, and the disk portion 5012 is located on the proximal end side of the first stepped surface 50211. The outer diameter of the first shaft portion 5013 is smaller than the outer diameter of the second shaft portion 5014. The first shaft portion 5013 at least partially enters the interior of the outer cover portion 5021. The outer diameter of the second shaft portion 5014 is smaller than the inner diameter of the first stepped surface 50211. Thus, the second shaft portion 5014 can rotate freely with respect to the outer cover portion 5021. In the initial state, the first stepped surface 50211 can abut against the distal end side surface of the disk portion 5012 or have a certain axial distance. The inner diameter of the stepped surface 5211 is smaller than the outer diameter of the disk portion 5012. Therefore, when the second pivoting portion 422 drives the driving portion 5022 to move in the proximal end side direction, after the outer cover portion 5021 moves in the proximal end side direction until the first stepped surface 50211 abuts against the distal end side surface of the disk portion 5012, the outer cover portion 5021 continues to move in the proximal end side direction, and the disk portion 5012 drives the entire first closing portion 501 to move in the proximal end side direction, and further can pull the closing pull tab 12 in the proximal end side direction.The outer diameter of the disk portion 5012 is smaller than the inner diameter of the outer cover portion 5021, whereby the disk portion 5012 can rotate freely inside the outer cover portion 5021.

[0091] Furthermore, in the third to fifth embodiments of the present invention, the closing drive mechanism can further automatically drive the opening of the staple head portion. Specifically, in the third to fifth embodiments, the operating lever includes a switching drive member, the operating lever includes a first position region and a second position region, and the second position region is located on the distal end side of the first position region.

[0092] In the firing process of the stapler, the link assembly is maintained in the second state, and the operating lever moves from the first position region to the second position region in the distal end side direction. After the firing of the stapler is completed, when the link assembly is in the second state and the operating lever is driven to move from the second position region to the first position region, the switching drive member presses the link assembly in a direction away from the operating lever, whereby the link assembly enters the first state, the third pivot portion and the fourth pivot portion move in a direction away from the operating lever, and the second pivot portion is driven by the closing pull rod assembly so that the closing pull tab moves in the distal end side direction of the stapler, thereby realizing that the staple head portion of the stapler can be automatically opened.

[0093] As shown in FIGS. 28 to 38, it is a schematic structural view of a closing drive mechanism and a stapler according to a third embodiment of the present invention. The stapler includes a staple head portion 9, a stapler body 1, and the closing drive mechanism. The staple head portion 9 is installed on the distal end side of the stapler body 1. The staple head portion 9 is installed on the distal end side of the stapler body 1. As shown in FIGS. 28 and 38, the staple head portion 9 includes an anvil 91 and a staple cartridge assembly 92 installed opposite to each other. The anvil 91 has a third state opened with respect to the staple cartridge assembly 92 and a fourth state closed with respect to the staple cartridge assembly 92. The process by which the anvil 91 and the staple cartridge assembly 92 realize the switching between the third state and the fourth state is the same as that of the first embodiment, and the description is omitted here. The process in which the anvil 91 enters from the third state to the fourth state is called the closing process of the staple head portion 9, that is, the closing process of the stapler. In the firing process of the stapler, it is necessary to hold the closing of the staple head portion 9. After the firing of the stapler is completed, when the closing pin 93 and the closing pull tab 12 move in the distal end side direction, the staple head portion 9 can be opened.

[0094] As shown in FIGS. 29 to 31, the closing drive mechanism further includes a link assembly 4, an operating lever 2, and a closing pull rod assembly 5. The link assembly 4 includes a first rod 41 and a second rod 42. The second rod 42 is located on the proximal end side of the first rod 41. The first rod 41 includes a first pivot portion 412 and a third pivot portion 413. The second rod 42 includes a second pivot portion 422 and a fourth pivot portion 423. The engagement structure between the first rod 41 and the second rod 42, the engagement result between the first rod 41 and the housing 13, and the engagement structure between the second rod 42 and the closing pull rod assembly 5 are the same as those of the first embodiment, and the description is omitted here.

[0095] The link assembly 4 includes a first state and a second state. When the link assembly 4 is in the first state, the second pivot portion 422 is in a third position region. When the link assembly 4 is in the second state, the second pivot portion 422 is in a fourth position region, and the fourth position region is on the proximal end side of the third position region. That is, in the process of the link assembly 4 changing from the first state to the second state, the second pivot portion 422 moves in the direction of the proximal end side of the stapler. The operating lever 2 includes a switching drive member. In this embodiment, the switching drive member is a rack 21 installed on one side of the operating lever 2. The operating lever 2 includes a first position region and a second position region, and the second position region is located on the distal end side of the first position region.

[0096] In this embodiment, the first position region is the position where the operating lever 2 is located in the initial state of the stapler, that is, the position where the operating lever 2 shown in FIG. 29 is located. The second position region is the position region where the operating lever 2 is located after the firing of the stapler is completed. During the firing process of the stapler, the firing handle 3 is gripped, and the operating lever 2 is driven to move from the first position region to the second position region by the engagement between the locking claw 31 of the firing handle 3 and the rack 21. As shown in FIG. 27, a retraction pull rod 7 is fixed to the operating lever 2. During the firing process of the stapler, the retraction pull rod 7 also moves in the direction of the distal end side along with the operating lever 2. The operating lever 2 drives the firing lever on the distal end side to fire the stapler. After the firing of the stapler is completed, the operating lever 2 is located in the second position region. By operating the retraction pull rod 7 to move it in the proximal end side direction, the retraction pull rod 7 drives the operating lever 2 to return from the second position region to the initial first position region again.

[0097] When the link assembly 4 is switched from the first state to the second state, the second pivoting portion 422 drives the closing pull tab 12 in the proximal end direction of the stapler via the closing pull rod assembly 5, thereby closing the staple head portion 9. When the link assembly 4 is in the second state and the operating lever 2 moves from the second position region to the first position region, the switching drive member presses the link assembly 4 in a direction away from the operating lever 2, causing the link assembly 4 to enter the first state. The third pivoting portion 413 and the fourth pivoting portion 423 move in a direction away from the operating lever 2, and the second pivoting portion 422 drives the closing pull tab 12 in the distal end direction of the stapler via the closing pull rod assembly 5, thereby enabling the staple head portion 9 to be automatically opened.

[0098] As shown in FIG. 29, the stapler body includes a housing 13 and a fixed handle 11. The closing drive mechanism further includes a firing handle 3, and the firing handle 3 is movably connected to the stapler body. A handle return spring 15 is installed in the stapler body. A locking claw 31 engageable with the rack 21 is installed on the firing handle 3. The engagement structure between the firing handle 3 and the first rod 41 and the shape of the first rod 41 and the second rod 42 are the same as those in the first embodiment, and the structure of the closing pull rod assembly 5 and its engagement structure with the second rod 42 are the same as those in the first embodiment, and the description thereof is omitted here.

[0099] As shown in FIGS. 29 to 33, the link assembly 4 further includes a drive button 46. On one side surface of the first rod 41 facing the operating lever 2, a first mounting groove 414 is provided. The second end of the drive button 46 is mounted in the first mounting groove 414, and the first end of the drive button 46 protrudes from the one side surface of the first rod 41 facing the operating lever 2. The first mounting groove 414 includes a first side wall 4141, a second side wall 4142, and a bottom wall 4143. The first side wall 4141 is located on the distal end side of the second side wall 4142. In the initial state, the drive button 46 is installed close to the second side wall 4142 of the first mounting hole and has a first gap with the first side wall 4141. An elastic member 47 is installed between the drive button 46 and the first side wall 4141, whereby the drive button 46 has a tendency to approach the second side wall 4142. When the link assembly 4 is in the first state, the drive button 46 is abutted against the second side wall 4142. In this embodiment, the elastic member 47 is a single elastic sheet, such as a metal elastic sheet, a plastic elastic sheet, etc. The first end of the elastic sheet is connected to the drive button 46. The second end of the elastic sheet has a bent portion 471. A first stopper groove 4144 is provided at the end of the first side wall 4141. The bent portion 471 enters the first stopper groove 4144 to maintain the stability of the position of the elastic sheet. The second end of the drive button 46 is pivotally connected to the bottom wall 4143 of the first mounting groove 414. At least a part of the outer wall of the second end of the drive button 46 is a first arc surface 461, and at least a part of the bottom wall 4143 of the first mounting groove 414 is a second arc surface. The first arc surface 461 is in close contact with the second arc surface and can rotate relative to the second arc surface. When the link assembly 4 is in the second state and the operating lever 2 moves from the second position region to the first position region, the rack 21 presses the first end of the drive button 46 in a direction away from the operating lever 2. In other alternative embodiments, the elastic member 47 may be a spring or other elastic members.

[0100] The operating principle of the closing drive mechanism will be described in detail below in relation to each stage of the stapler.

[0101] As shown in FIGS. 29 to 33, in the initial state, the link assembly 4 is in the first state, the firing handle 3 is in an initial position away from the fixed handle 11, and the operating lever 2 is in the first position region. As shown in FIG. 30, at this time, the third pivot portion 413 and the fourth pivot portion 423 are in positions relatively away from the operating lever 2. The distance between the center of the first pivot portion 412 and the center of the second pivot portion 422 is L1, the link assembly 4 is in an axially compact state, and as shown in FIG. 33, an included angle a1 is formed between the first rod 41 and the second rod 42. The drive button 46 is installed close to the second side wall 4142 of the first mounting groove 414, and the first end of the drive button 46 protrudes from the surface of the first rod 41 on the side facing the operating lever 2. Since the third pivot portion 413 and the fourth pivot portion 423 are relatively away from the operating lever 2, the rack 21 does not act on the drive button 46. At this time, the outer surface of the second engaging portion 411 of the first rod 41 abuts against the first engaging portion 32 of the firing handle 3. The link assembly 4 is in a relatively stable state, and when the firing handle 3 is not gripped, it can be ensured that the state of the link assembly 4 does not change, and the closing pull rod assembly 5 can be well held in its initial position.

[0102] After the staple head portion 9 reaches the surgical site, by gripping the firing handle 3, the firing handle 3 rotates along the first direction, and the second rod 42 rotates along the second direction, i.e., the S4 direction, with respect to the first rod 41. In the perspective view of FIG. 30, the S4 direction is the clockwise direction. FIGS. 34 to 36 show the structure after the link assembly 4 enters the second state.

[0103] As shown in FIGS. 34 to 36, after the link assembly 4 enters the second state from the first state, the third pivot portion 413 and the fourth pivot portion 423 move in a direction approaching the operating lever 2 compared to the first state, that is, they move to a position relatively approaching the operating lever 2 upward in the perspective of FIG. 34. At this time, the link assembly 4 is in a relatively stable second state. The axial distance between the center of the first pivot portion 412 and the center of the second pivot portion 422 is L2, and the distance L2 is larger than the axial distance L1 in the first state shown in FIG. 30, and the link assembly 4 is in a relatively expanded state axially. As shown in FIG. 36, the included angle between the first rod 41 and the second rod 42 is a2, and the included angle a2 is larger than the included angle a1 in the first state shown in FIG. 33. Since the first pivot portion 412 cannot be displaced axially relative to the housing 13, the second pivot portion 422 moves in the proximal end side direction, driving the closing pull rod assembly 5 to move in the proximal end side direction. The sleeve portion 51 compresses and deforms the closing return spring 6, and the closing pull rod assembly 5 pulls the closing pull tab 12 to move in the proximal end side direction, enabling the closing of the staple head portion 9 to be realized.

[0104] In the firing process of the stapler, the link assembly 4 is held in the second state. If the firing handle 3 is continuously gripped, the locking claw 31 of the firing handle 3 drives the rack 21, and the rack 21 drives the operating lever 2 to move from the first position region to the second position region on the distal end side, and the retraction pull rod 7 also moves in the distal end side direction accordingly. As shown in FIG. 37, in the firing process of the stapler, the teeth of the rack 21 contact the first end of the drive button 46 and drive the first end of the drive button 46 to move in the distal end side direction, and the first end of the drive button 46 at least partially enters the first mounting groove 414, and the elastic member 47 is pressed to generate elastic deformation. At this time, the drive button 46 does not prevent the movement of the rack 21 in the distal end side direction, and the third pivot portion 413 and the fourth pivot portion 423 are not pressed to move away from the operating lever 2. The link assembly 4 can be held in the second state, maintaining the stability of the closing of the staple head portion 9 and avoiding the unexpected opening of the staple head portion 9 during the firing process of the stapler.

[0105] After the firing of the stapler is completed, the operating lever 2 moves to the second position area. The rack 21 moves to the distal end side of the first end of the drive button 46. The drive button 46 is not affected by the action of the rack 21. Under the action of the deformation restoring force of the elastic member 47, the first end of the drive button 46 rotates in the proximal end side direction and returns to the state shown in Fig. 36. The operating lever 2 is further connected to a retraction pull rod 7 (shown in Fig. 30) via a fourth pin shaft 23 (shown in Fig. 30), and a pull rod groove for guiding the movement of the retraction pull rod 7 is installed in the housing 13. When the operating lever 2 moves to the second position area, the retraction pull rod 7 moves to the distal end side of the pull rod groove accordingly. At this time, the operator manually operates the retraction pull rod 7 to move it to the proximal end side of the pull rod groove, and the retraction pull rod 7 drives the operating lever 2 to move in the proximal end side direction. As shown in Fig. 38, when the rack 21 moves from the second position area to the first position area, the rack 21 presses the drive button 46 in a direction away from the operating lever 2. The first end of the drive button 46 is stopped by the second side wall 4142 of the first mounting groove 414 and cannot rotate in the proximal end side direction, thus preventing the proximal end side movement of the rack 21. The rack 21 applies a downward acting force to the first end of the drive button 46. The third pivot portion 413 and the fourth pivot portion 423 move in a direction away from the operating lever 2 (direction S6 in Fig. 38), whereby the link assembly 4 enters the first state. At the same time, the second pivot portion 422 drives the closing pull tab 12 by the closing pull rod assembly 5 to move in the distal end side direction of the stapler, thereby realizing that the staple head portion 9 of the stapler can be automatically opened.

[0106] As shown in FIGS. 39 to 43, it is a schematic structural view of a part of the closing drive mechanism according to the fourth embodiment of the present invention. The difference between the fourth embodiment and the third embodiment is as follows. On one side of the second rod 42 facing the operating lever 2, a second mounting groove 424 is provided, and the second end of the drive button 46 is attached to the second mounting groove 424. The second mounting groove 424 includes a first side wall 4241, a second side wall 4242, and a bottom wall 4243, and the first side wall 4241 is located on the distal end side of the second side wall 4242. In the initial state, the drive button 46 is installed close to the second side wall 4242 of the first mounting hole and has a first gap with the first side wall 4241. An elastic member 47 is installed between the drive button 46 and the first side wall 4241. In this embodiment, the elastic member 47 is an elastic sheet, such as a metal elastic sheet, a plastic elastic sheet, etc. The first end of the elastic sheet is connected to the drive button 46, the second end of the elastic sheet has a bent portion 471, and a second position regulating portion groove 4244 is installed at the end of the first side wall 4241. The bent portion 471 enters the second position regulating portion groove 4244 to maintain the stability of the position of the elastic sheet. At least a part of the outer wall of the second end of the drive button 46 is a first arc surface 461, at least a part of the bottom wall 4243 of the second mounting groove 424 is a second arc surface, the first arc surface 461 is in close contact with the second arc surface, and the first arc surface 461 can rotate relative to the second arc surface. When the link assembly 4 is in the second state and the operating lever 2 moves from the second position region to the first position region, the rack 21 presses the first end of the drive button 46 in a direction away from the operating lever 2. In other alternative embodiments, the elastic member 47 may be a spring or other elastic member. The structures of other members in the fourth embodiment, such as the operating lever 2, the firing handle 3, the connecting rod 18, the closing pull tab 12, the closing pull rod assembly 5, the stapler body 1, the staple head portion 9, etc., may be the same as those in the third embodiment, or may be different from the third embodiment and use other structures, all of which belong to the protection scope of the present invention.

[0107] The closing principle of the stapler in the fourth embodiment is the same as that in the third embodiment. FIG. 41 shows the structure when the connecting component is in the second state and the rack 21 does not act on the driving button 46. At this time, the first end of the driving button 46 protrudes from the surface on one side facing the operating lever 2 of the second rod 42. As shown in FIG. 42, in the firing process of the stapler, the rack 21 drives the first end of the driving button 46 to move in the distal end side direction and at least partially enter the second mounting groove 424, thereby not preventing the movement of the distal end side of the rack 21. As shown in FIG. 43, after the firing of the stapler is completed, the retracting pull rod 7 is pulled proximally, and the rack 21 moves in the proximal end side direction and acts on the first end of the driving button 46, applying a pressure to the driving button 46 in a direction away from the operating lever 2, moving the third pivot portion 413 and the fourth pivot portion 423 in a direction away from the operating lever 2, the link assembly 4 returns to the first state, and at the same time the second pivot portion 422 drives the closing pull tab 12 through the closing pull rod assembly 5 to move in the proximal end side direction, thereby automatically opening the staple head portion.

[0108] As shown in FIGS. 44 to 46, it is a schematic structural view of a part of the closing drive mechanism according to the fifth embodiment of the present invention. The differences between this embodiment and the third embodiment are as follows. One drive button 48 is installed on at least one side of the first rod 41, the drive button 48 is rotatably connected to the side wall of the first rod 41, and the switching drive member is the drive tooth 22 installed on at least one side of the operating lever 2. As shown in FIGS. 45 and 46, in this embodiment, the drive buttons 48 are installed on both sides of the first rod 41, and one drive tooth 22 is installed on each of both sides of the operating lever 2. The drive tooth 22 includes a first side wall 221 and a second side wall 222. The first side wall 221 of the drive tooth 22 is located on the distal end side of the second side wall 222. The first side wall 221 of the drive tooth 22 is a vertical surface, and the second side wall 222 of the drive tooth 22 is a guide surface. The proximal end side of the guide surface is inclined upward compared to the distal end side. In other alternative embodiments, the drive button 48 may be installed only on one side of the first rod 41, and the drive tooth 22 may be installed on one side of the operating lever 2.

[0109] In this embodiment, the drive button 48 is installed on the third pivot portion 413, and the first end of the drive button 48 can rotate in the distal end side direction around the second pin shaft 44. A stopper portion 415 is further installed on the first rod 41. The stopper portion 415 is located on the proximal end side of the drive button 48 and prevents the movement of the second end of the drive button 48 in the proximal end side direction. A torsion spring may be sleeved on the second pin shaft 44. The torsion spring abuts against the drive button 48 and the first rod 41. In other embodiments, the drive button 48 may be engaged with other types of elastic members 47.

[0110] The closing principle of the stapler in the fifth embodiment is the same as that in the third embodiment. In the firing process of the stapler, when the driving tooth 22 moves from the proximal end side to the distal end side of the driving button 48, the driving tooth 22 drives the first end of the driving button 48 to rotate in the distal end side direction, thereby not preventing the movement of the distal end side of the driving tooth 22, and the torsion spring generates elastic deformation. After the firing of the stapler is completed, the retraction pull rod 7 is pulled, and the driving tooth 22 is moved in the proximal end side direction along with the operating lever 2. The driving tooth 22 acts on the driving button 48, and the driving button 48 is blocked by the stopper portion 415 and cannot move in the proximal end side direction. The driving tooth 22 applies a force in the direction away from the operating lever 2 to the first end of the driving button 48, moves the third pivoting portion 413 and the fourth pivoting portion 423 in the direction away from the operating lever 2, the link assembly 4 returns to the first state, and at the same time, the second pivoting portion 422 drives the closing pull tab 12 in the proximal end side direction through the closing pull rod assembly 5, thereby automatically opening the staple head portion.

[0111] Furthermore, due to the existence of the structural size chain tolerance of the stapler, after the stapler is opened, the closing pull tab may not return to the predetermined position. When it is necessary to manually open the staple head portion, the reset button is operated to move the stapler in the distal end side direction, drive the closing pull tab to move in the distal end side direction of the stapler to manually open the staple head portion, thereby avoiding the occurrence of a situation where the closing pull tab does not return to the predetermined position and the staple head portion cannot be normally opened. In the sixth and seventh embodiments of the present invention, a structure for manually controlling the opening of the staple head portion by a reset button is further provided. Specifically, in the sixth and seventh embodiments, the closing drive mechanism further includes a reset button. The reset button is located on the proximal end side of the connecting rod, the reset button at least partially enters the inside of the connecting rod, and can move axially with respect to the connecting rod.

[0112] As shown in FIGS. 47 to 59, it is a schematic structural view of a closing drive mechanism according to a sixth embodiment of the present invention and a medical stapler including the same. The engagement between the staple head portion and the stapler body in this embodiment is the same as that in the first embodiment. As shown in FIG. 1 of the first embodiment, the stapler includes a staple head portion 9, a stapler body, and the closing drive mechanism. The closing drive mechanism is used to control the closing and opening of the staple head portion 9. The staple head portion 9 is installed on the distal end side of the stapler body 1. The stapler body 1 includes a housing 13 and a fixed handle 11 installed on one side. As shown in FIGS. 1 and 2 of the first embodiment, the staple head portion 9 includes an anvil 91 and a staple cartridge assembly 92 installed opposite to each other. The anvil 91 has a third state in which it is open with respect to the staple cartridge assembly 92 and a fourth state in which it is closed with respect to the staple cartridge assembly 92. The switching between the third state and the fourth state between the anvil 91 and the staple cartridge assembly 92 is the same as that in the first embodiment, and the description thereof is omitted here.

[0113] As shown in FIGS. 47 to 50, the closing drive mechanism further includes a connecting rod 18 and a reset button 8. The connecting rod 18 extends along the axial direction of the stapler. The closing pull tab 12 is at least partially located inside the connecting rod 18 and can move axially relative to the connecting rod 18. A first position restricting portion is provided on the proximal end side of the closing pull tab 12. The reset button 8 is located on the proximal end side of the connecting rod 18. The reset button 8 includes an operating portion 81 and a reset engaging portion 82. The reset engaging portion 82 of the reset button 8 at least partially enters the inside of the connecting rod 18 and can move axially relative to the connecting rod 18. The operating portion 81 is connected to the proximal end side of the reset engaging portion 82, and the proximal surface of the operating portion 81 is a surface suitable for the pressing operation of the operator. In the initial state, the reset engaging portion 82 abuts against the first position restricting portion. When the closing pull tab 12 moves in the proximal end side direction, the first position restricting portion can drive the reset engaging portion 82 to move in the proximal end side direction. At the same time, when it is necessary to manually open the staple head portion, the operating portion 81 of the reset button 8 is operated to move in the distal end side direction of the stapler. The reset engaging portion 82 abuts against the first position restricting portion and drives the closing pull tab 12 to move in the distal end side direction of the stapler, so that the staple head portion can be manually opened, thereby avoiding the situation that the staple head portion cannot be normally opened because the closing pull tab 12 cannot return to a predetermined position.

[0114] As shown in FIGS. 47 to 50, the closing drive mechanism further includes a second position restricting portion. The second position restricting portion is located on the proximal end side of the first position restricting portion and is axially fixed to the housing 13 of the stapler body. When the reset button 8 is driven to move in the proximal end side direction of the stapler, it is restricted by the second position restricting portion. A second position restricting portion engaging portion is provided on the body 13 of the stapler, and the second position restricting portion is rotatably provided on the second position restricting portion engaging portion. In this embodiment, the second position restricting portion is the first connecting pin 19. The second position restricting portion engaging portion is a circumferential groove 132 provided on the inner surface of the housing 13. The first connecting pin 19 is movably installed in the circumferential groove 132 and can rotate within the circumferential groove 132. Here, the rotation of the first connecting pin 19 means that the first connecting pin 19 rotates along its own axis. The direction of S8 in FIG. 48 is the lateral direction of the stapler, that is, the width direction.

[0115] As shown in FIG. 50, the operation portion 81 is located on the proximal end side of the first connecting pin 19, and the first connecting pin 19 at least partially enters the reset engaging portion 82. Specifically, a slide groove 822 extending along the axial direction is provided on the side surface of the reset engaging portion 82. The first connecting pin 19 at least partially enters the slide groove 822 and can move along the extending direction of the slide groove 822. Due to the engagement between the first connecting pin 19 and the slide groove 822, the reset engaging portion 82 is restricted to move only axially with respect to the first connecting pin 19, that is, the reset engaging portion 82 has no displacement in the lateral and longitudinal directions with respect to the first connecting pin 19 and cannot rotate with respect to the first connecting pin 19. The slide groove 822 does not communicate with the distal end and the proximal end of the reset engaging portion 82, thereby ensuring that the first connecting pin 19 does not separate from the reset engaging portion 82 at the distal end and the proximal end of the slide groove 822.

[0116] In the sixth embodiment shown in FIGS. 47 to 50, the closing drive mechanism further includes an annular fixing member 14, and the fixing member 14 is located on the proximal end side of the connecting rod 18. A fixing member mounting hole adapted to the shape of the fixing member 14 is provided in the housing 13 of the stapler body 1, and the fixing member 14 is fixed to the fixing member mounting hole 132 to realize a fixed connection of the fixing member 14 to the housing 13 of the stapler body 1. The operation portion 81 of the reset button 8 is located on the proximal end side of the fixing member 14, and the reset engaging portion 82 is formed inside the fixing member 14, and the reset engaging portion 82 can move along the axial direction of the stapler with respect to the fixing member 14. The fixing member 14 further restricts the vertical and horizontal positions of the reset button 8, whereby the reset button 8 moves only in the axial direction with respect to the housing 13 of the stapler body 1. In this embodiment, the outer diameter of the reset engaging portion 82 is smaller than the inner diameter of the fixing member 14, and the outer diameter of the operation portion 81 is larger than the inner diameter of the fixing member 14, whereby the operation portion 81 can be held on the proximal end side of the fixing member 14 and does not enter the inside of the fixing member 14.

[0117] As shown in FIGS. 47 to 50, in this embodiment, the first position restricting portion is the second connecting pin 53. The closing drive mechanism can further include a structure for driving the closing of the staple head portion. Specifically, the closing drive mechanism further includes a firing handle 3, a link assembly 4, and a closing pull rod assembly 5. The firing handle 3 is pivotally connected to the housing 13 of the stapler body 1. The firing handle 3 includes a first engaging portion 32. A handle return spring 15 is installed between the firing handle 3 and the stapler housing. When the firing handle 3 is gripped and rotated toward the fixed handle 11, elastic deformation occurs in the handle return spring 15. The link assembly 4 includes a first rod 41 and a second rod 42. The second rod 42 is located on the proximal end side of the first rod 41. The first rod 41 includes a first pivoting portion 412. The second rod 42 includes a second pivoting portion 422. The link assembly 4 includes two relatively stable states, a first state corresponding to the opening of the staple head portion and a second state corresponding to the closing of the staple head portion. The engagement structure among the firing handle 3, the first rod 41, the second rod 42, the closing pull rod assembly 5, and the housing 13 is the same as that in the first embodiment, and the description thereof is omitted here.

[0118] Hereinafter, with reference to FIGS. 47 to 59, the structure of the closing drive mechanism in different states according to the sixth embodiment will be described in detail. Here, FIGS. 47 to 55 show the structure of the closing drive mechanism when the staple head portion opens. Here, the link assembly 4 is in the second state. FIGS. 56 to 58 show the structure of the closing drive mechanism when the staple head portion closes. Here, the link assembly 4 is in the second state. FIG. 59 shows the structure of the closing drive mechanism after the staple head portion is opened again by the closing drive mechanism in the closed state of the staple head portion in this embodiment. Here, the link assembly 4 returns to the first state.

[0119] As shown in FIGS. 50 to 52, in the initial state, the link assembly 4 is in a first state. The link assembly 4 is in a relatively compact state, the distance between the first pivoting portion 412 and the second pivoting portion 422 of the link assembly 4 is small, and the third pivoting portion 413 and the fourth pivoting portion 423 are located at positions away from the connecting rod 18. The closing pull rod assembly 5 includes a sleeve portion 51 and a driving portion 52. The sleeve portion 51 is sleeved outside the connecting rod 18 and can move axially with respect to the connecting rod 18. A through hole 511 is provided on the distal end side of the sleeve portion 51. The second connecting pin 53 penetrates through the through hole 511 to realize a fixed connection between the distal end side of the sleeve portion 511 and the proximal end side of the closing pull tab 12. The driving portion 52 is located on one side of the sleeve portion 51 facing the link assembly 4, and one end of the driving portion 52 is pivotally connected to the second pivoting portion 422 of the link assembly 4. A second biasing member is further provided between the sleeve portion 51 and the first connecting pin 19. The second biasing member applies a biasing force to the sleeve portion 51 in the direction of the distal end side of the stapler. Specifically, the second biasing member is a second return spring 61. The second return spring 61 is installed between the stepped surface 512 inside the sleeve portion 51 and the first connecting pin 19. The second return spring 61 may be, for example, a compression spring.

[0120] As shown in FIGS. 52 to 54, a pin hole 141 is provided on the side wall of the fixing member 14, and the first connecting pin 19 penetrating through the fixing member 14 is drilled in the pin hole 141.

[0121] In this embodiment, a first biasing member is installed between the reset engaging portion 82 and the first connecting pin 19, and the first biasing member applies a biasing force to the reset engaging portion 82 in the direction of the distal end side of the stapler. Specifically, as shown in FIGS. 50 and 53, the first biasing member is a first return spring 62, there is a cavity inside the reset engaging portion 82, and the first return spring 62 is installed inside the cavity. In a preferred embodiment, one end of the first return spring 62 abuts against the distal end of the cavity, and the second end of the first return spring 62 abuts against the first connecting pin 19, thereby keeping the reset button 8 in a stable state. The first return spring 62 may be, for example, a compression spring. A spring mounting hole 821 may be formed on the upper surface of the cavity and used to mount the first return spring 62 inside the cavity of the reset engaging portion 82.

[0122] As shown in FIGS. 50, 51, and 55, when the link assembly 4 is in the first state, the axial distance between the first pivot portion 412 and the second pivot portion 422 of the link assembly 4 is L1, and the included angle between the first rod 41 and the second rod 42 is a1. When the firing handle 3 rotates along the first direction (counterclockwise direction in FIG. 51), the first engaging portion 32 of the firing handle 3 engages with the second engaging portion 411 of the first rod 41, and the first rod 41 is driven to rotate along the S3 direction (counterclockwise direction in FIG. 55) around the first pin shaft 43. The second rod 42 rotates along the S4 direction (clockwise direction in FIG. 55) around the second pin shaft 44. As a result, the distance between the second pivot portion 422 and the first pivot portion 412 gradually increases, the included angle between the first rod 41 and the second rod 42 gradually increases, the third pivot portion 413 and the fourth pivot portion 423 move in a direction approaching the connecting rod 18, and the link assembly 4 enters the second state shown in FIG. 56. As can be seen by comparing FIGS. 55 and 56, after the link assembly 4 is in the second state, the axial distance between the second pivot portion 422 and the first pivot portion 412 increases from L1 to L2, and the included angle between the first rod 41 and the second rod 42 also increases to an included angle of approximately 180°. Since the first pivot portion 412 does not axially displace relative to the housing 13 of the stapler body 1, the second pivot portion 422 in the second state moves in the proximal end side direction compared to the second pivot portion 422 in the first state, and drives the closing pull rod assembly 5 to move in the proximal end side direction. At this time, the link assembly 4 is held in the relatively stable second state. Even if the firing handle 3 is loosened at this time, the firing handle 3 returns to its initial position under the action of the handle return spring 15, and the state of the link assembly 4 remains unchanged.

[0123] As shown in FIGS. 56 to 58, when the link assembly 4 enters from the first state to the second state, since the closing pull rod assembly 5 moves in the proximal end direction, the closing pull rod assembly 5 drives the closing pull tab 12 to move in the proximal end direction via the second connecting pin 53, thereby realizing the closing of the staple head portion. At the same time, the second connecting pin 53 abuts against the distal end face 823 of the reset engaging portion 82, and drives the reset engaging portion 82 to move in the proximal end direction, so that the entire reset button 8 moves in the proximal end direction, and there is an axial distance between the distal end of the operation portion 81 and the proximal end of the fixing member 14, and the operation portion 81 protrudes outside the proximal end side of the housing 13 of the stapler. At this time, the reset engaging portion 82 of the reset button 8 compresses and deforms the first return spring 62, and the sleeve portion 51 of the closing pull rod assembly 5 compresses and deforms the second return spring 61.

[0124] In this embodiment, the closing drive mechanism can include an automatic opening structure of the staple head portion after the staple head portion is closed. Specifically, the link assembly 4 further includes a drive button 46, and the closing drive mechanism further includes a switching drive member. In this embodiment, the closing drive mechanism includes an operating lever 2 sleeved outside the connecting rod 18, and a rack 21 is installed on one side of the operating lever 2 facing the link assembly 4. The rack 21 serves as a firing drive member of the stapler and at the same time serves as the switching drive member. The rack 21 includes a first position region and a second position region, and the first position region is located on the proximal end side of the second position region. In the initial state, the rack 21 is in the first position region. As shown in FIG. 49, the firing handle 3 further includes a locking claw 31 that engages with the rack 21. After the staple head portion is closed, by gripping the firing handle 3 again, the locking claw 31 can drive the rack 21 in the distal end direction, whereby the rack 21 drives the operating lever 2 to move in the distal end direction, and the stapler is fired.

[0125] The drive button 46 is rotatably connected to the first rod 41 or the second rod 42. Specifically, as shown in FIGS. 56 and 57, in this embodiment, a first mounting groove 414 is provided inside the first rod 41. The first end of the drive button 46 enters the first mounting groove 414 and can rotate around the first end within the first mounting groove 414. When the second end of the drive button 46 is not subjected to an external force, the second end of the drive button 46 protrudes from the surface of the first rod 41 facing the connecting rod 18, and the drive button 46 is close to the second side wall 4142 of the first mounting groove 414. In the state of FIG. 56, when the firing handle 3 is gripped to drive the rack 21 to move from the first position region to the second position region, the rack 21 contacts the second end of the drive button 46 and presses the second end of the drive button 46 downward, driving the drive button 46 to rotate, approaching the drive button 46 to the first side wall 4141 of the first mounting groove 414, and simultaneously deforming one-sided elastic member 47. The drive button 46 further enters the first mounting groove 414 and enters the state of FIG. 57, without blocking the movement of the rack 21. At the same time, the link assembly 4 is also held in the second state, maintaining the stability of the staple head portion.

[0126] After the firing of the stapler is completed, by operating the retraction pull rod 7 to move the operating lever 2 in the proximal end direction, when moving the operating lever 2 from the second position region to the first position region, the rack 21 presses the drive button 46 in a direction away from the operating lever 2, and the drive button 46 drives the third pivot portion 413 and the fourth pivot portion 423 to move in a direction away from the connecting rod 18. Thereby, the link assembly 4 newly enters the first state. In this process, the second pivot portion 422 drives the closing pull rod assembly 5 to move in the distal end direction, and the closing pull tab 12 is driven to move in the distal end direction to automatically open the staple head portion.

[0127] However, in actual applications, due to the size chain tolerance of the mechanical structure or other situations, the automatic release structure of the staple head portion may fail. After the link assembly 4 completes firing, it may return to the open state, but there may be a situation where the closed pull tab does not return to the designated position, causing the staple head portion to not open normally or the opening angle of the staple head portion to be restricted and unable to open completely. At this time, manual release of the staple head portion can be achieved by operating the reset button 8. Specifically, as shown in FIGS. 56 and 58, when the link assembly 4 is in the second state, there is a certain distance between the distal end of the operating portion 81 of the reset button 8 and the proximal end of the fixing member 14. At the same time, the operating portion 81 of the reset button 8 protrudes from the surface of the housing 13, making it easy to operate. The operator can press the reset button 8 in the distal end side direction (i.e., along the S7 direction in FIG. 58), whereby the reset button 8 moves in the distal end side direction and moves to the position shown in FIG. 59. In this process, under the driving action of the operating portion 81, the reset engaging portion 82 drives the second connecting pin 53 in the distal end side direction, moves the closed pull tab 12 in the distal end side direction to open the staple head portion. At the same time, the second connecting pin 53 drives the sleeve portion 51 of the closed pull rod assembly 5 to move in the distal end side direction, and the driving portion 52 of the closed pull rod assembly 5 drives the second pivoting portion 422 to move in the distal end side direction. As a result, the third pivoting portion 413 and the fourth pivoting portion 423 move to the position shown in FIG. 59 in the direction away from the connecting rod 18, that is, the link assembly 4 returns to the first state again, and the first return spring 62 and the second return spring 61 also return to the initial state. Therefore, when the staple head portion of the stapler is in the closed state, by operating the reset button 8, the closed pull tab 12 is driven to retreat to the distal end side, and the staple head portion is manually opened, thereby avoiding the situation where the staple head portion cannot be opened normally because the closed pull tab 12 does not retreat to the predetermined position.

[0128] As shown in Fig. 60, it is a schematic structural view of a closing drive mechanism according to the seventh embodiment of the present invention. The difference between the seventh embodiment and the sixth embodiment shown in Figs. 47 to 59 is as follows. The closing drive mechanism includes a structure for manual closing and manual opening of the staple head portion. Specifically, the closing drive mechanism further includes a switching drive member 16, and one end of the switching drive member 16 protrudes outside the housing of the stapler body, which is easy for an operator to manually operate. A drive button 48 is installed at the third pivot portion 413 of the first rod 41, and the drive button 48 cannot rotate with respect to the first rod 41. The switching drive member 16 is sleeved outside the connecting rod 18, and a third return spring 63 is installed between the switching drive member 16 and the housing of the stapler body 1. The third return spring 63 may be, for example, a compression spring. The switching drive member 16 includes a fifth position region and a sixth position region, and the fifth position region is located on the distal end side of the sixth position region. In the initial state, the switching drive member 16 is located in the fifth position region. By operating the switching drive member 16, it is moved from the fifth position region to the sixth position region in the proximal end side direction of the stapler, driving the closing pull rod assembly 5 to move in the proximal end side direction to close the staple head portion. At the same time, the closing pull rod assembly 5 drives the second pivot portion 422 by the drive portion 52 to move in the proximal end side direction, and the third pivot portion 413 and the fourth pivot portion 423 of the link assembly 4 move in a direction approaching the connecting rod 18, whereby the link assembly 4 enters from the first state to the second state. During the firing process of the stapler, the switching drive member 16 is located on the proximal end side of the drive button 48 and does not act on the link assembly 4, and the link assembly 4 is held in the second state.After the firing of the stapler is completed, when the switching drive member 16 is operated to move from the sixth position region toward the distal end side of the stapler to the fifth position region, the third return spring 63 is compressed, and the switching drive member 16 presses the drive button 48 of the link assembly 4 in a direction away from the connecting rod 18. The third pivot portion 413 and the fourth pivot portion 423 move in a direction away from the connecting rod 18, the link assembly 4 returns to the first state, the closing pull rod assembly 5 moves in the distal end side direction, and the closing pull tab 12 is driven to move in the distal end side direction to open the staple head portion.

[0129] In the seventh embodiment, when the switching drive member 16 fails or the switching drive member 16 cannot completely open the staple head portion, similarly, by pressing the operation portion 81 of the reset button 8 along the S7 direction in FIG. 60, the operation portion 81 drives the reset engagement portion 82 to move in the distal end side direction, the closing pull tab 12 is moved in the distal end side direction to open the staple head portion, and at the same time, the second connecting pin 53 drives the sleeve portion 51 of the closing pull rod assembly 5 to move in the distal end side direction. The drive portion 52 of the closing pull rod assembly 5 drives the second pivot portion 422 to move in the distal end side direction, the third pivot portion 413 and the fourth pivot portion 423 are moved in a direction away from the connecting rod 18, and the link assembly 4 returns to the first state.

[0130] In FIGS. 47 to 59, the closing drive mechanism includes a structure that drives to close the staple head portion by a firing handle, a structure that automatically opens the staple head portion, and a structure that resets by manually operating a reset button 8 when the structure that automatically opens the staple head portion fails. In the embodiment of FIG. 60, the closing drive mechanism includes a mechanism that manually closes the staple head portion and opens the staple head portion, and a structure that resets by manually operating the reset button 8 when the switching drive member 16 fails. In other alternative embodiments, the reset structure of the reset button in the closing drive mechanism can engage with the opening structure of other staple head portions, and is not limited to the structure of the rack and drive button shown in FIGS. 47 to 59 and the structure of the switching drive member shown in FIG. 60. In still other alternative embodiments, it is not necessary to provide a structure for automatically / manually opening the staple head portion, and only a structure that drives to close the staple head portion by a firing handle and a reset structure of the reset button may be provided. That is, after driving to close the staple head portion by a firing handle, driving to fire the stapler by the firing handle, and then directly opening the staple head portion by operating the reset button belong to the protection scope of the present invention. In still other alternative embodiments, other structures that drive to close the staple head portion may be provided and can be combined with the structure of the reset button.

[0131] The above content further describes the present invention in more detail with reference to specific preferred embodiments, and the specific implementation of the present invention is not limited to these descriptions. For those skilled in the technical field to which the present invention pertains, without departing from the concept of the present invention, a plurality of simple inferences or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

Claim 1 A closing drive mechanism, which is used in a medical stapler, the stapler including a stapler body, the closing drive mechanism including a first pivoting portion and a second pivoting portion, the first pivoting portion being pivotally connected to the stapler body, the second pivoting portion being located on the proximal end side of the first pivoting portion, a link assembly having a first state and a second state, a firing handle including a first engaging portion, and a closing pull rod assembly pivotally connected to the second pivoting portion of the link assembly, wherein when the link assembly is in the first state and the firing handle rotates along a first direction, the first engaging portion drives the link assembly to enter the second state, the second pivoting portion of the link assembly moves in the proximal end side direction of the stapler, and the closing pull rod assembly is driven to move in the proximal end side direction of the stapler characterized by the above. Claim 2 The link assembly includes a first rod and a second rod, the second rod being located on the proximal end side of the first rod, the first rod including the first pivoting portion and a third pivoting portion, the second rod including the second pivoting portion and a fourth pivoting portion, the third pivoting portion being pivotally connected to the fourth pivoting portion characterized by the closing drive mechanism according to claim 1, wherein when the link assembly is in the first state and the firing handle rotates along a first direction, the first engaging portion drives the first rod to rotate along the first direction, and the second rod rotates along a second direction with respect to the first rod, the second direction being opposite to the first direction, and the included angle between the first rod and the second rod increases characterized by the closing drive mechanism according to claim 1. Claim 3 The closing drive mechanism further includes a connecting rod, the closing pull rod assembly being sleeved outside the connecting rod, and when the link assembly changes from the first state to the second state, the third pivoting portion and the fourth pivoting portion move in a direction approaching the connecting rod, and the closing pull rod assembly is driven to move in the proximal end side direction of the connecting rod characterized by the closing drive mechanism according to claim 2. Claim 4 The closing drive mechanism further includes a closing pull tab located inside the connecting rod. The closing pull rod assembly includes a connected sleeve portion and a drive portion. The sleeve portion is sleeved outside the connecting rod and connected to the proximal end side of the closing pull tab. The drive portion is pivotally connected to the second pivoting portion. The closing drive mechanism according to claim 3, characterized in that.

5. The third pivoting portion includes a concave groove. The fourth pivoting portion at least partially enters into the concave groove of the third pivoting portion. A protrusion is installed on the fourth pivoting portion. When the link assembly is in the second state, the protrusion abuts against the outer wall of the concave groove, preventing the second rod from continuously rotating along the second direction with respect to the first rod, or The fourth pivoting portion includes a concave groove. The third pivoting portion at least partially enters into the concave groove of the fourth pivoting portion. A protrusion is installed on the third pivoting portion. When the link assembly is in the second state, the protrusion abuts against the outer wall of the concave groove, preventing the second rod from continuously rotating along the second direction with respect to the first rod. The closing drive mechanism according to claim 2, characterized in that.

6. The closing drive mechanism is a connecting rod extending along the axial direction of the stapler, and a closing pull tab extending in the axial direction of the stapler and at least partially located inside the connecting rod. The closing pull rod assembly includes a first closing portion and a second closing portion. The first closing portion surrounds the outside of the connecting rod and is respectively connected to the proximal end side of the connecting rod and the proximal end side of the closing pull tab. When the connecting rod rotates around the central axis of the connecting rod, the closing pull tab and the first closing portion are driven to rotate around the central axis of the connecting rod. The second closing portion is pivotally connected to the second pivoting portion of the link assembly and is rotatably sleeved at least partially outside the first closing portion. When the second closing portion moves in the proximal end side direction of the stapler, the first closing portion drives the closing pull tab to move in the proximal end side direction. The closing drive mechanism according to claim 1, characterized in that.

7. The second closing part includes a connected outer cover part and a driving part. The outer cover part is sleeved outside the first closing part, and the first closing part is rotatable around the central axis of the connecting rod relative to the outer cover part. The driving part is pivotally connected to the second pivotal part of the link assembly. The first closing part includes a shaft part and a disc part. The disc part is located on the proximal end side of the shaft part. An annular first stepped surface is installed on the proximal end side of the outer cover part of the second closing part. The shaft part enters at least partially inside the outer cover part, and the disc part is located on the proximal end side of the first stepped surface. The outer diameter of the shaft part is smaller than the inner diameter of the first stepped surface, and the inner diameter of the first stepped surface is smaller than the outer diameter of the disc part. The closing drive mechanism according to claim 6, characterized in that.

8. The closing drive mechanism includes a switching drive member, includes a first position area and a second position area, an operating lever where the second position area is located on the distal end side of the first position area, and further includes a closing pull tab fixedly connected to the closing pull rod assembly at the proximal end side. When the link assembly is in the second state and the operating lever moves from the second position area to the first position area, the switching drive member presses the link assembly in a direction away from the operating lever. Thereby, the link assembly enters the first state, the third pivotal part and the fourth pivotal part move in a direction away from the operating lever, and the second pivotal part moves the closing pull tab in the direction of the distal end side of the stapler by the closing pull rod assembly. The closing drive mechanism according to claim 2, characterized in that.

9. The link assembly further includes a drive button. The drive button is attached to the first rod or the second rod, and the first end of the drive button protrudes from the surface of the first rod or the second rod on the side facing the operating lever. When the link assembly is in the second state and the operating lever moves from the second position area to the first position area, the switching drive member presses the first end of the drive button in a direction away from the operating lever. The closing drive mechanism according to claim 8, characterized in that.

10. When the link assembly is in the second state and the actuating lever moves from the first position region to the second position region, the first rod does not rotate relative to the second rod. When the link assembly is in the second state and the actuating lever moves from the second position region to the first position region, the first rod is pivotably rotatable relative to the second rod. The closing drive mechanism according to claim 9, characterized in that.

11. A mounting groove is provided on a surface of one side of the first rod or the second rod facing the actuating lever, and the drive button is mounted in the mounting groove. The mounting groove includes a first side wall, a second side wall, and a bottom wall. The first side wall of the mounting groove is located on the distal end side of the second side wall. There is a first gap between the drive button and the first side wall of the mounting groove. When the link assembly is in the first state, the drive button is in contact with the second side wall of the mounting groove. When the link assembly is in the second state and the actuating lever moves from the first position region to the second position region, the drive button moves toward the first side wall of the mounting groove. The closing drive mechanism according to claim 10, characterized in that.

12. The drive button is installed on at least one side of the first rod. The drive button is rotatably connected to the side wall of the first rod. The switching drive member is a drive tooth installed on at least one side of the actuating lever. A stopper portion is further installed on the first rod. The stopper portion is located on the proximal end side of the drive button and prevents the drive button from moving in the proximal end side direction of the second end of the drive button. The closing drive mechanism according to claim 10, characterized in that.

13. The closing drive mechanism is a connecting rod extending along the axial direction of the stapler, a closing pull tab at least partially located inside the connecting rod and axially movable relative to the connecting rod, with a first position restricting portion fixedly installed on the proximal end side. Located on the proximal end side of the connecting rod, at least partially entering the interior of the connecting rod, and axially movable relative to the connecting rod, when driven to move in the distal end side direction of the stapler, a reset button for driving the closing pull tab to move in the distal end side direction of the stapler, and further comprising The closing drive mechanism according to claim 2, characterized in that

14. The stapler includes a stapler body, the closing drive mechanism further includes a second position restricting portion, the second position restricting portion is located on the proximal end side of the first position restricting portion, and is axially fixed to the housing of the stapler body, When the reset button is driven to move in the distal end side direction of the stapler, it abuts against the first position restricting portion, and when the reset button is driven to move in the proximal end side direction of the stapler, it is positionally restricted by the second position restricting portion A second position restricting portion engaging portion is provided on the stapler body, and the second position restricting portion is rotatably provided on the second position restricting portion engaging portion The closing drive mechanism according to claim 13, characterized in that

15. A medical stapler, characterized by comprising the closing drive mechanism according to any one of claims 1 to 14

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