WO2023109820A1

WO2023109820A1 - Closure switching mechanism and medical stapler

Info

Publication number: WO2023109820A1
Application number: PCT/CN2022/138722
Authority: WO
Inventors: 丁水澄; 史晓杰
Original assignee: 天臣国际医疗科技股份有限公司
Priority date: 2021-12-14
Filing date: 2022-12-13
Publication date: 2023-06-22

Abstract

A closure switching mechanism and a medical stapler. The closure switching mechanism comprises: a linkage assembly (4), the linkage assembly (4) comprising a first pivot portion (412) and a second pivot portion (422), the first pivot portion (412) being pivotally connected to a stapler body (1), and the linkage assembly (4) has a first state and a second state; a switching drive member (7), the switching drive member (7) being movable in a first direction and a second direction, and the first direction being opposite to the second direction; and a closure pull rod assembly (5), the closure pull rod assembly (5) being pivotally connected to the second pivot portion (422), wherein when the switching drive member (7) moves in the first direction, the closure pull rod assembly (5) is driven to move in the first direction, such that the linkage assembly (4) enters the second state from the first state; and the switching drive member (7) is configured to be operable to drive the linkage assembly (4) to enter the first state from the second state, and the second pivot portion (422) drives the closure pull rod assembly (5) to move in the second direction. The closure switching mechanism and the medical stapler can achieve the manual closure and opening of a staple head (9).

Description

Closed switching mechanism and medical stapler

technical field

The invention relates to the technical field of medical instruments, in particular to a closed switching mechanism and a medical stapler.

Background technique

The medical stapler includes a medical stapler body, a firing handle movably connected to the medical stapler body, and a nail head matched with the body. The nail head includes a nail cartridge assembly and a nail anvil which are oppositely arranged. During the operation, the operator first holds the firing handle, and pulls the closing tab to move toward the proximal side of the stapler through the closing switching mechanism, thereby closing the staple cartridge assembly and the staple anvil, that is, closing the staple head. Then, the operator holds the firing handle again, and can push the staples to move toward the tissue. Through the forming of the staples in the staple cartridge assembly at the anvil, the tissues are anastomosed. At the same time, the cutter moves to the distal side to cut the tissue. Realize the triggering of the stapler. In the existing closing switching mechanism, the structure is relatively complicated, and after the stapler is fired, it may be difficult to open the nail head, which brings inconvenience to the operator.

Contents of the invention

In view of the problems in the prior art, the object of the present invention is to provide a closing switching mechanism and a medical stapler, by operating the switching driving member to move in different directions, the manual closing and manual opening of the nail head can be realized.

An embodiment of the present invention provides a closed switching mechanism for a medical stapler, the stapler includes a stapler body, and the closed switching mechanism includes:

The linkage assembly includes a first pivot portion and a second pivot portion, the first pivot portion is pivotally connected to the stapler body, and the linkage assembly includes a first state and a second state;

a switching drive member movable in a first direction and a second direction, the first direction being opposite to the second direction;

a closing pull rod assembly, the closing pull rod assembly is pivotally connected to the second pivot joint;

Wherein, when the switching driving member moves toward the first direction, it drives the closing rod assembly to move toward the first direction, so that the connecting rod assembly enters the second state from the first state;

And the switching driving member is configured to be operable to drive the linkage assembly from the second state into the first state, and the second pivot portion drives the closing pull rod assembly to the second direction sports.

In some embodiments, the linkage assembly includes a first rod and a second rod, the second rod is located on the proximal side of the first rod, the first rod includes the first pivot portion and a third pivotal portion, the second rod includes the second pivotal portion and a fourth pivotal portion, the third pivotal portion is pivotally connected to the fourth pivotal portion;

When the connecting rod assembly enters the second state from the first state, the third pivot portion and the fourth pivot portion move toward a third direction; the switching driving member moves toward the second When moving in one direction, the switching driving member drives the third pivotal part and the fourth pivotal part to move in a fourth direction, and the third direction is opposite to the fourth direction.

In some embodiments, a connecting rod is further included, the third direction is a direction toward the connecting rod, and the fourth direction is a direction away from the connecting rod;

The switching driving member includes a first driving part and a first sheath part, the first sheathing part is sheathed on the outside of the connecting rod or the outside of the closing rod assembly, and the first driving part is located on the first An outer sleeve portion faces one side of the connecting rod assembly, and when the first outer sleeve portion moves toward the first direction, it drives the closing rod assembly to move toward the first direction, so that the connecting rod assembly is moved by the The first state enters the second state.

In some embodiments, the first direction is toward the proximal side of the stapler, the second direction is toward the distal side of the stapler, and the first direction and the second The directions are all along the axial direction of the stapler.

In some embodiments, when the link assembly is in the second state, and the switching driving member moves toward the second direction, the link assembly is driven to enter the first state, and the second The two pivot joints drive the closing rod assembly to move in the second direction.

In some embodiments, the first rod or the second rod is provided with a second driving part, and when the linkage assembly is in the second state, the second driving part is relatively the rod or the second rod protrudes towards the direction of the connecting rod;

When the connecting rod assembly is in the second state and the switching driving member moves toward the second direction, the switching driving member presses the second driving part in a direction away from the connecting rod, so that the The connecting rod assembly enters the first state.

In some embodiments, the switching driving member moves toward the first direction, so that after the linkage assembly enters the second state from the first state, the first driving part is located in the second state. Proximal side of the drive unit.

In some embodiments, the distal side of the first driving part is provided with a first guiding surface, and/or the proximal side of the second driving part is provided with a second guiding surface.

In some embodiments, the second driving portion is disposed on the third pivot portion or the fourth pivot portion.

In some embodiments, the switching driving member includes two first driving parts, and the two first driving parts are arranged symmetrically with respect to the axial direction of the stapler; the connecting rod assembly is provided with two The second driving part, the switching driving part is configured to be operable to drive the connecting rod assembly from the second state to the first state, and each of the first driving parts respectively drives one of the first driving parts. 2. Drive unit.

In some embodiments, the first driving part is a driving arm extending from the first outer casing part to the second direction.

In some embodiments, a switching biasing member is provided between the switching driving member and the stapler body, and the switching biasing member gives the switching driving member a first bias toward the first direction force.

In some embodiments, the switch biasing member is a switch return spring, one side of the first jacket part is provided with a spring fitting groove, and one end of the switch return spring is arranged in the spring fitting groove.

In some embodiments, the closing pull rod assembly includes a second outer casing part and a third driving part, the second outer casing part is sleeved on the outside of the connecting rod, and the first outer casing part of the switching driving part is connected to the third driving part. The second outer casing part is matched, the first end of the third driving part is pivotally connected to the second pivotal part, and the second end of the third driving part is fixedly connected to the second outer casing part.

In some embodiments, a closing biasing member is disposed between the closing rod assembly and the stapler body, and the closing biasing member gives the closing rod assembly a second bias toward the second direction force.

In some embodiments, the closure rod assembly includes a first closure member and a second closure member, the first closure member is sleeved on the outside of the connecting rod, and the second closure member includes the second outer sleeve part and the driving part, the first closure part is axially fixed to the second outer casing part, and the part of the first closure part protruding from the distal end side of the second outer casing part passes through the switch The interior of the first housing portion of the driver.

In some embodiments, the closing biasing member is a closing return spring, a spring matching stepped surface is provided inside the first closing member, and one end of the closing returning spring is opposed to the spring matching stepped surface.

In some embodiments, the switching driving member includes an operating portion protruding from the outer surface of the housing of the stapler body, and the housing is provided with a receiving groove for accommodating the operating portion.

In some embodiments, it further includes a closure pull piece, the proximal side of the closure pull piece is connected to the closure pull rod assembly through a connecting pin.

In some embodiments, the switching drive member is pivotally connected to the closing rod assembly, the link assembly is in the second state, and the switching driving member is in a fifth direction relative to the closing rod assembly When rotating, the connecting rod assembly is driven to enter the first state, and the second pivot portion drives the closing pull rod assembly and the switching driving member to move in the second direction.

In some embodiments, the switching driving member includes a first driving part and a rotating fitting part, the rotating fitting part is pivotally connected to the closing pull rod assembly through a rotating shaft, and the link assembly includes a second driving part ;

When the connecting rod assembly is in the second state and the switching driving member rotates in the fifth direction, the first driving part drives the second driving part in a direction away from the connecting rod, so that the The linkage assembly enters the first state.

In some embodiments, when the connecting rod assembly is in the second state, the first driving part is located on the side of the second driving part facing the connecting rod, and the first driving part and the There is a certain height gap between the opposite surfaces of the second driving part.

In some embodiments, the switching driving member further includes a first outer casing part, the closing pull rod assembly includes a second outer casing part and a third driving part, and the first outer casing part is sleeved on the second outer casing part. Externally, the second outer sleeve part is sleeved on the outside of the connecting rod, the third driving part is pivotally connected with the second pivot part of the connecting rod assembly, and the second outer sleeve part faces the first When moving in one direction, the connecting rod assembly is driven to enter the second state from the first state.

In some embodiments, the first driving part is a driving arm extending from the rotating fitting part to the second direction, and the rotating fitting part is connected to the first outer casing part and the first driving arm. There is a bending part between the parts, and a fixed angle is set between the first driving part and the first jacket part.

In some embodiments, the rotating fitting part is pivotally connected to the third driving part of the closing rod assembly through the rotating shaft.

In some embodiments, a switching bias is provided between the switching driving member and the closing rod assembly, and when the switching driving member rotates in the fifth direction relative to the closing rod assembly, the switching bias The member is deformed to give the switching driving member a second biasing force to rotate in a sixth direction, the sixth direction being opposite to the fifth direction.

In some embodiments, the switching biasing member is a switching return spring, a first spring installation part is provided on the closing rod assembly, a second spring installation part is provided on the switching driving part, and the switching return spring The two ends of the two ends are respectively fixed on the first spring mounting part and the second spring mounting part, and when no external force is applied, the proximal end surface of the switching driving member is at least partially abutted against the closing rod assembly.

In some embodiments, the switching driving member is fixed in the axial direction of the stapler relative to the closing rod assembly, and the switching driving member can move in a seventh direction relative to the closing rod assembly, so A fixed angle is set between the seventh direction and the first direction or the second direction;

Wherein, when the switching driving member moves toward the first direction, it drives the closing pull rod assembly to move toward the first direction, so that the connecting rod assembly enters the second state from the first state; When the switching driving member moves in the seventh direction relative to the closing rod assembly, it drives the connecting rod assembly to enter the first state, and the second pivot part drives the closing rod assembly and the The switching driving member moves in the second direction.

In some embodiments, the included angle is a right angle, and the switching driving member can move in an up and down direction relative to the closing rod assembly.

In some embodiments, the switching driving member includes a first driving part and a connecting fitting part, and the connecting fitting part is fixed in the axial direction relative to the closing rod assembly, and can be relative to the closing rod assembly for movement in the seventh direction, the linkage assembly includes a second drive portion;

When the connecting rod assembly is in the second state, and the switching driving assembly moves in the seventh direction relative to the closing pull rod assembly, the first driving part drives the first driving part along the seventh direction. and a second driving part, so that the connecting rod assembly enters the first state.

In some embodiments, the seventh direction is a direction toward the connecting rod or a direction away from the connecting rod.

In some embodiments, the switching driving member further includes a first connecting part, the closing rod assembly includes a second outer casing part and a third driving part, the first connecting part is movably connected to the second outer casing part, The second outer sleeve part is sheathed on the outside of the connecting rod, and the third driving part is pivotally connected to the second pivot part of the connecting rod assembly.

In some embodiments, the first connection part is a first outer casing part, and the first connection part is sleeved on the second outer casing part.

In some embodiments, the connecting fitting part is provided with a sliding slot extending along the seventh direction, and the closing rod assembly is provided with a boss, or, the closing rod assembly is provided with a sliding groove extending along the seventh direction. The chute, the connecting part is provided with a boss;

The protrusion at least partially enters the interior of the chute, and can move along the extending direction of the chute.

In some embodiments, a switching biasing member is provided between the switching driving member and the closing rod assembly, and the switching biasing member gives a second biasing force to the switching driving member, and the second The direction of the biasing force is opposite to the seventh direction.

In some embodiments, the switching driving member is provided with a slide slot extending along the seventh direction, the closing pull rod assembly is provided with a boss, and the switching driving member is provided with a spring matching portion, or, the closing The pull rod assembly is provided with a chute extending along the seventh direction, and the switching drive member is provided with a boss;

The protruding post at least partly enters the interior of the chute, and can move along the extending direction of the chute, and the two ends of the switching biasing member are respectively arranged on the protruding post and the spring fitting part.

In some embodiments, the second driving portion is disposed on the third pivotal portion and/or the fourth pivotal portion.

In some embodiments, the third pivotal part and the fourth pivotal part are pivotally connected by a second pin shaft, the second driving part is integrated with the second pin shaft, and the first The two driving parts protrude from the surfaces of the third pivot part and the fourth pivot part.

In some embodiments, the switching driving member further includes a first sheath part, and the closing pull rod assembly includes a second sheath part, and the second sheath part is sheathed on the outside of the connecting rod, and the first sheath The part is sheathed on the outside of the second sheath part; the first driving part is located at the distal end side of the connection matching part.

In some embodiments, when the connecting rod assembly is in the second state, the first driving part is located on the side of the second driving part facing the connecting rod, and the first driving part faces the One side surface of the second driving part is a plane parallel to the axial direction.

In some embodiments, the second pivotal part is rotatably connected to the closing rod assembly through a third pin shaft, the second driving part is arranged on the second pivotal part, and the second The driving part and the fourth pivot part are respectively located on two sides of the third pin.

In some embodiments, the switching driving part includes two side walls, and the two side walls are respectively located on both sides of the third driving part, and the first driving part is connected to the switching driving part. Fourth pin between the two side walls.

In some embodiments, when the connecting rod assembly is in the first state, the second driving part is located on the side of the first driving part facing the connecting rod, and the second driving part is connected to the connecting rod. There is a height gap between the opposite surfaces of the first driving part;

A fitting groove is provided on a side of the second driving part away from the connecting rod, and when the connecting rod assembly is in the second state, the first driving part at least partially enters into the fitting groove.

An embodiment of the present invention also provides a medical stapler, including the above-mentioned closing switching mechanism.

The closed switching mechanism and medical stapler provided by the present invention have the following advantages:

The invention provides a closure switching mechanism for a medical stapler. By operating the switching drive member, the connecting rod assembly can be switched between different states without passing through the handle of the stapler, and the closing rod assembly can be controlled to move axially along the stapler. , when the closing rod assembly moves to the first direction, the nail head can be closed, and when the closing rod assembly moves to the second direction, the nail head can be opened, so that manual closing and manual opening of the nail head can be realized, and the structure is simple , easy to operate.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings.

Fig. 1 is a schematic structural view of a stapler according to a first embodiment of the present invention;

Fig. 2 is the structural representation of the nail head of the first embodiment of the present invention;

3 is a schematic structural view of the stapler body in the first embodiment of the present invention after one side of the housing is removed, wherein the connecting rod assembly is in the first state, and the switching drive member is in the first position range;

Fig. 4 is a structural schematic diagram of the cooperation between the connecting rod assembly and the closing rod assembly according to the first embodiment of the present invention;

Fig. 5 is a schematic diagram of the structure of the cooperation of the connecting rod assembly, the closing pull rod assembly and the switching drive member according to the first embodiment of the present invention;

Fig. 6 is a schematic structural view of the closed switching mechanism according to the first embodiment of the present invention, wherein the connecting rod assembly is in the second state, and the switching driving member is in the second position range;

Fig. 7 is a schematic diagram of cooperation between the connecting rod assembly and the second closing member according to the first embodiment of the present invention;

Fig. 8 is a schematic structural view of the closing rod assembly according to the first embodiment of the present invention;

Fig. 9 is an exploded view of the closing rod assembly of the first embodiment of the present invention;

Fig. 10 is a schematic structural view of the first closing member of the first embodiment of the present invention;

Fig. 11 is a schematic diagram of the cooperation between the closing rod assembly and the switching drive member according to the first embodiment of the present invention;

Fig. 12 is a schematic structural diagram of a switching drive member according to the first embodiment of the present invention;

Fig. 13 is a schematic structural view of the closed switching mechanism according to the first embodiment of the present invention, wherein the connecting rod assembly is in the second state, and the switching driving member moves to the first position range;

Fig. 14 is a schematic structural view of the closed switching mechanism according to the first embodiment of the present invention, wherein the connecting rod assembly is in the first state, and the switching driving member is in the first position range;

Fig. 15 is a schematic structural view of the stapler body with part of the casing removed according to the second embodiment of the present invention;

Fig. 16 is a schematic structural view of the closing switching mechanism of the second embodiment of the present invention;

Fig. 17 and Fig. 18 are schematic diagrams of the cooperation between the closing rod assembly and the switching driving member according to the second embodiment of the present invention;

Fig. 19 is a schematic structural view of the closing switching mechanism when the connecting rod assembly is in the first state according to the second embodiment of the present invention;

Fig. 20 is an exploded view of the closing switching mechanism of the second embodiment of the present invention;

Fig. 21 is a schematic structural view of the closing switching mechanism when the connecting rod assembly is in the second state according to the second embodiment of the present invention;

Fig. 22 is a schematic diagram of the cooperation between the switching drive member and the connecting rod assembly according to the second embodiment of the present invention;

Fig. 23 is a schematic structural view of the closed switching mechanism when the switching driving member rotates according to the second embodiment of the present invention;

Fig. 24 is a schematic structural view of the closed switching mechanism when the switching driving member rotates according to the third embodiment of the present invention;

Fig. 25 is a schematic structural view of the stapler body after one side of the shell is removed according to the first embodiment of the present invention;

Fig. 26 is a schematic structural view of the closing switching mechanism of the first embodiment of the present invention;

Fig. 27 is a perspective view of the closing switching mechanism of the first embodiment of the present invention;

Fig. 28 is a schematic structural view of the connecting rod assembly in the first state according to the first embodiment of the present invention;

Fig. 29 is a schematic structural view of the closing switching mechanism when the connecting rod assembly is in the first state according to the first embodiment of the present invention;

Fig. 30 is an exploded view of the closing switching mechanism of the first embodiment of the present invention;

Fig. 31 is a schematic structural view of the connecting rod assembly in the second state according to the first embodiment of the present invention;

Fig. 32 is a schematic structural view of the closing switching mechanism when the connecting rod assembly is in the second state according to the first embodiment of the present invention;

Fig. 33 is a schematic structural view of the closing switching mechanism when the nail head is opened according to the first embodiment of the present invention;

Fig. 34 is a schematic structural view of the closing switching mechanism when the connecting rod assembly is in the first state according to the second embodiment of the present invention;

Fig. 35 is a schematic structural view of the closing rod assembly when the connecting rod assembly is in the second state according to the second embodiment of the present invention;

Fig. 36 is a perspective view of the closing rod assembly of the second embodiment of the present invention;

Fig. 37 is an exploded view of the closing rod assembly of the second embodiment of the present invention;

Fig. 38 is a schematic structural view of the closing switching mechanism when the nail head is opened according to the second embodiment of the present invention.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus their repeated descriptions will be omitted.

The invention provides a closing switching mechanism for a medical stapler and a medical stapler comprising the closing switching mechanism. The stapler also includes a nail head and a stapler body, the nail head is arranged on the distal side of the stapler body, and the stapler body is provided with a closing tab for closing the nail head , the distal side of the closure tab is connected to the nail head. The closing switching mechanism includes: 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 link assembly includes a first state and a second state; a switching drive member movable in a first direction and a second direction, the first direction being opposite to the second direction; a closing tie rod assembly pivotally connected on the second pivot joint.

When it is necessary to close the nail head of the stapler, when the switching driving member is operated to move toward the first direction, the closing pull rod assembly is driven to move toward the first direction, and the closing pull tab can be pulled toward the second direction. moving in one direction, so as to close the nail head and make the connecting rod assembly enter the second state from the first state. After the staple heads are closed, the firing of the stapler can proceed. After the firing of the stapler is completed, when the nail head needs to be opened, the switching driving member is manually operated, and the switching driving member is configured to be operable to drive the linkage assembly from the second state to the first state. In the state, the second pivotal part drives the closing rod assembly to move in the second direction, thereby opening the nail head. Therefore, the closing switching mechanism of the present invention can realize manual closing and manual opening of the nail head, and has a simple structure and convenient operation.

The structure of the closing switching mechanism of each specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that each specific embodiment is not intended to limit the scope of protection of the present invention.

Further, in the first embodiment of the present invention, when the connecting rod assembly is in the second state and the switching driving member is operated to move toward the second direction, the switching driving member drives the The connecting rod assembly enters the first state, and the second pivot portion drives the closing pull rod assembly to move in the second direction, so as to open the nail head.

As shown in FIGS. 1 to 14 , the first embodiment of the present invention provides a closing switching mechanism for a medical stapler and a medical stapler including the closing switching mechanism. As shown in FIG. 1 , the stapler further includes a nail head 9 and a stapler body 1 , and the nail head 9 is disposed on the distal side of the stapler body 1 . The stapler body 1 includes a housing 13 , and one side of the housing 13 is provided with a fixed handle 11 . The inside of the stapler body 1 is provided with a closing tab 12 for closing the nail head 9 , and the distal side of the closing tab 12 is connected to the nail head 9 .

In the present invention, the distal side and the proximal side are relative to the operator, the end closer to the operator is the proximal side, and the end farther away from the operator, that is, the end closer to the surgical site is the far side. End side, the direction along the axis of the stapler is the axial direction, that is, the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. For example, in the viewing angle of FIG. 1 , for the stapler, its distal end side is the left side, and its proximal end side is the right side. The S1 direction in FIG. 1 is the direction from the distal side to the proximal side of the stapler. Define the S1 direction or the direction opposite to the S1 direction as the axial direction of the stapler. The S2 direction in FIG. 3 is defined as the longitudinal direction, that is, the height direction.

As shown in Fig. 1 and Fig. 2, the nail head 9 includes an anvil 91 and a nail cartridge assembly 92 oppositely arranged, and the proximal end side of the nail anvil 91 and the proximal end side of the nail cartridge assembly 92 are rotatable. ground connection, so that the anvil 91 has an open state and a closed state relative to the staple cartridge assembly 92. Specifically, the proximal side of the nail anvil 91 is provided with a first matching groove 911, and the proximal side of the nail cartridge assembly 92 is provided with a second matching groove 921 extending axially, and a closing pin 93 is simultaneously installed in the The first fitting groove 911 , the second fitting groove 921 and the distal side of the closing pull tab 12 . When the closing pull tab 12 moves toward the proximal side, the closing pin 93 also moves toward the proximal side, driving the nail anvil 91 to move toward the nail cartridge assembly 92 to close the nail head 9 . When the closing tab 12 moves toward the distal side, the closing pin 93 also moves toward the distal side, driving the nail anvil 91 to move away from the nail cartridge assembly 92 to open the nail head Part 9.

As shown in FIGS. 3-5 , the closing switching mechanism includes a link assembly 4 , a switching driving member 7 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 side of the first rod 41, and the first rod 41 includes a first pivot portion 412 and a second rod 41. Three pivotal joints 413 , the second rod 42 includes a second pivotal joint 422 and a fourth pivotal joint 423 . The first pivotal part 412 is pivotally connected to the housing 13 of the stapler body 1 through the first pin shaft 43, so that the first pivotal part 412 is connected to the housing 13 of the stapler body 1 Relatively fixed in the axial direction. The third pivotal part 413 is pivotally connected to the fourth pivotal part 423 through the second pin shaft 44 , and the second pivotal part 422 is pivotally connected to the closing rod assembly through the third pin shaft 45 5, so that the second pivot portion 422 is relatively fixed in the axial direction with the closing rod assembly 5, and the closing rod assembly 5 is fixedly connected with the proximal end side of the closing pull piece 12, so that the closing rod The axial movement of the component 5 can drive the axial movement of the closing tab 12 .

In this embodiment, the link assembly 4 includes a first state and a second state, both of which are relatively balanced states. The switching drive 7 comprises a first position area and a second position area. In the initial state, the link assembly 4 is in the first state, and the link assembly 4 is in a relatively compact state, that is, the shaft between the first pivot portion 412 and the second pivot portion 422 If the direction distance is small, the switching drive member 7 is in the first position area. When it is necessary to drive the nail head to close, by driving the switching driving member 7 to move toward the first direction, the closing rod assembly 5 is driven to move toward the proximal side of the stapler, and the second pivot part 422 moves toward the proximal side of the stapler, the third pivot part 413 and the fourth pivot part 423 move toward the third direction, the link assembly 4 enters the second state, the The connecting rod assembly 4 enters a relatively stretched state, the axial distance between the first pivotal part 412 and the second pivotal part 422 increases, and at the same time, the closing pull rod assembly 5 drives the closing pull piece 12 moves proximally to close the nail head. When the switching driving member 7 moves to the second position area, the nail head is closed.

After the nail head is closed, the link assembly 4 is in the relatively stable second state, and the switching drive member 7 is located in the second position area, at this time, the stability of the nail head closure can be maintained , and the firing of the stapler can be carried out, and the accidental movement of the closure tab 12 will not occur when the stapler is firing, which will affect the stability of the closure of the nail head. After the firing of the stapler is completed, when the nail head needs to be opened, the switching driving member 7 is operated to move from the second position area toward the second direction, and the switching driving member 7 presses the connecting rod in the fourth direction The assembly 4 can drive the link assembly 4 to enter the first state from the second state, and the second pivot portion 422 of the link assembly 4 drives the closing rod assembly 5 to move toward the distal side, and the closing rod assembly 5 can The closing pull piece 12 is driven to move in the direction of the distal end to open the nail head, so that the nail head can be opened manually, the structure is simple, and the operation is convenient.

The structure and working principle of the closing switching mechanism of the present invention will be described in detail below in conjunction with FIGS. 3-14 . In this embodiment, the second position area of the switching driver 7 is located on the proximal side of the first position area, therefore, the first direction is toward the proximal side of the stapler (S1 in FIG. 3 direction), the second direction is a direction toward the distal side of the stapler (a direction opposite to the S1 direction). And the first direction and the second direction are both along the axial direction of the stapler. When the switching driving member 7 moves from the first position area to the proximal side, it can drive the nail head to close, and when the switching driving member 7 moves from the second position area to the distal side, it can drive the nail head to open. department. The first position area refers to the position area where the switching drive member 7 is located in the initial state as shown in Figures 3-5, and the second position area refers to the nail head as shown in Figure 6 After the closing is completed, the position area where the driving member 7 is located is switched.

As shown in Figures 3-5, they are schematic structural diagrams of the closing switching mechanism in the initial state of this embodiment. The closing switching mechanism also includes a connecting rod 18 . The closing pull piece 12 passes through the inside of the connecting rod 18 . The connecting rod 18 is sleeved with the actuating rod 2 , the switching driving member 7 and the closing pull rod assembly 5 . The stapler also includes a firing handle 3 pivotally connected to the housing 13 of the stapler body 1 , and the firing handle 3 is connected to a handle return spring 15 . The initial position of the firing handle 3 is located away from the fixed handle 11. When the firing handle 3 is held, the handle return spring 15 is elastically deformed. When the firing handle 3 is released, the elastic deformation of the handle return spring 15 Under the action of restoring force, the firing handle 3 can return to the initial position. One end of the firing handle 3 is provided with a claw 31 , and the claw 31 cooperates with the rack 21 on one side of the actuating rod 2 . During the firing process of the stapler, by holding the firing handle 3 , the claw 31 of the firing handle 3 can drive the rack 21 to move toward the distal side, thereby firing the stapler. In this embodiment, the third direction is the direction from bottom to top in the viewing angle of FIG. direction. The fourth direction is a direction from top to bottom in the perspective of FIG. 3 , that is, for the third pivotal portion 413 and the fourth pivotal portion 423 , the direction away from the connecting rod 18 . In the state shown in Figures 3-5, the third pivotal portion 413 and the fourth pivotal portion 423 are in a position relatively far away from the connecting rod 18, and the connecting rod assembly 4 is in a relatively stable first position. In a state, the axial distance between the first pivotal portion 412 and the second pivotal portion 422 is relatively small. The switching drive 7 is in the first position range.

As shown in FIGS. 3 to 5 , the switching drive member 7 includes an operating portion 73 , a first driving portion 72 and a first sheathing portion 71 , the operating portion 73 is connected to the first sheathing portion 71 and protrudes from the first sheathing portion 71 . The outer surface of the casing 13 of the above-mentioned stapler body 1 is convenient for the operator to use. The housing 13 is correspondingly provided with a receiving groove for accommodating the operating portion 73 , the operating portion 73 is partly located in the receiving groove, and partly extends out of the housing 13 . The first sheath portion 71 is sleeved on the outside of the connecting rod 18 or the outside of the closing rod assembly 5 , and can move axially relative to the connecting rod 18 . The first driving part 72 is located on a side of the first outer casing part 71 facing the connecting rod assembly 4 . The third pivot portion 413 of the first rod 41 is provided with a second driving portion 46 , and the second driving portion 46 protrudes from a side surface of the first rod 41 facing the connecting rod 18 . When the connecting rod assembly 4 is in the second state (the state shown in FIG. 6 ), the second driving part 46 faces toward the connecting rod relative to the first rod 41 or the second rod 42 The direction of 18 protrudes. In the initial state, the second driving part 46 is located at a position relatively away from the connecting rod 18 along with the third pivot part 413, and will not contact the first driving part 72, and the first driving part 72 The portion 72 will not apply force to the second driving portion 46 .

As shown in Figures 3 to 5, the closing rod assembly 5 includes a first closing member 51 and a second closing member 52, the first closing member 51 is sleeved on the outside of the connecting rod 18, and the second closing member The member 52 includes a second outer casing part 521 and a third driving part 522, the proximal side of the first closure part 51 at least partly enters the second outer casing part 521, the first closure part 51 and the second closure part 51 The sheath part 521 is axially fixed, and the part of the first closure part 51 protruding from the distal side of the second sheath part 521 passes through the inside of the first sheath part 71 of the switching drive part 7 . The distal side of the first closing member 51 is provided with a through hole 511, and the connecting pin 53 (shown in FIG. 8 ) passing through the through hole 511 of the first closing member 51 can close the first closing member 51. The distal side of the member 51 is fixedly connected to the proximal side of the closure pull piece 12 . A first end of the third driving part 522 is pivotally connected to the second pivot part 422 of the second lever 42 , and a second end of the third driving part 522 is connected to the second outer sleeve part 521 . One or two guiding parts 5221 are provided on the side of the third driving part 522 . The inner surface of the housing 13 of the stapler body 1 is provided with one or two guide grooves 131, the guide grooves 131 extend in the axial direction, the guide portion 5221 at least partially enters the guide grooves 131, and can Move along the extending direction of the guide groove 131 . The cooperation of the guide portion 5221 and the guide groove 131 restricts the movement of the second closing member 52 only in the axial direction. In other alternative embodiments, a guide part may also be provided on the inner surface of the housing 13 of the stapler body 1, and a guide groove may be provided on the side of the third driving part 522, which also belongs to the scope of protection of the present invention. Inside.

As shown in FIGS. 3 to 5 , the first sheath portion 71 of the switch driving member 7 is located at the distal side of the second sheath portion 521 of the second closing member 52 . The distal end surface of the second sheath portion 521 is a switching mating surface 5211 , and the switching mating surface 5211 abuts against the proximal end surface of the first sheathing portion 71 of the switching driving member 7 . A switching biasing member is provided between the switching driving member 7 and the stapler body 1 , and the switching biasing member gives the switching driving member 7 a first biasing force toward the proximal side. In this embodiment, the switching biasing member is a switching return spring 62 , and can optionally be a compression spring disposed on the distal side of the switching driving member 7 . In other alternative implementation manners, the switching biasing member may also be a spring, a tension spring disposed on the proximal side of the switching driving member 7 or other types of elastic members.

As shown in FIGS. 3-5 , a stop portion 14 is provided inside the housing 13 of the stapler body 1 . A closing biasing member is disposed between the closing rod assembly 5 and the stopper portion 14 , and the closing biasing member gives the closing rod assembly 5 a second biasing force toward the distal end side. In this embodiment, the closing biasing member is a closing return spring 61 , and can optionally be a compression spring disposed on the proximal side of the closing pull rod assembly 5 . In other alternative embodiments, the closing biasing member may also be an elastic piece, a tension spring provided on the distal side of the closing rod assembly 5 or other types of elastic members.

In the state shown in FIGS. 3-5 , when the connecting rod assembly 4 is in the first state, the closing return spring 61 basically does not deform or only slightly deforms. Under the action of the second biasing force of the closing return spring 61 , the closing pull rod assembly 5 abuts against the switching driving member 7 and keeps the switching driving member 7 in the first position area. However, the first biasing force of the switching return spring 62 is not enough to overcome the second biasing force of the closing return spring 61 , therefore, the switching return spring 62 is compressed and deformed. Through the effect of the closing return spring 61, it is possible to further prevent the switching drive member 7 from moving in the direction of the proximal end under the action of the switching return spring 62, and further keep the closing switching mechanism when it is not subjected to external force. state stability. As shown in FIG. 5 , in the initial state, the axial length of the closing return spring 61 is L11 , and the axial length of the switching return spring 62 is L21 .

In the state shown in FIGS. 3 to 5 , the operating part 73 of the switching driving member 7 is operated, so that the switching driving member 7 moves from the first position area to the first direction, and the first outer sleeve part 71 acts on the second outer sleeve portion 521 to make the closing rod assembly 5 move toward the proximal side of the stapler as a whole. The closing rod assembly 5 drives the second pivoting part 422 to move in the first direction through the third driving part 522 . The third pivot portion 413 and the fourth pivot portion 423 move toward the third direction, that is, move upward and approach the connecting rod 18 , and the first rod 41 rotates counterclockwise around the first pivot 43 Rotate, the second lever 42 rotates clockwise around the third pivot 45, and the link assembly 4 enters the second state. At this time, the state of the closed switching mechanism is shown in FIG. 6 . Comparing FIG. 6 and FIG. 5 , it can be seen that the switching driving member moves proximally to the second position area, and the axial length of the switching return spring 62 is extended to L22, and L22 is greater than L21. The third driving part 522 of the second closing member 52 moves toward the proximal side, and the first closing member 51 drives the closing pull tab 12 to move toward the proximal side to close the nail head. The closing return spring 61 is compressed and deformed, and the axial length of the closing return spring 61 is shortened to L12, and L12 is smaller than L11. The first driving part 72 is located at the proximal side of the second driving part 46 and does not act on the second driving part 46 . At this time, the connecting rod assembly 4 is in a relatively stable second state, and under the action of the connecting rod assembly 4 , the closing return spring 61 and the switching return spring 62 , the closing pull rod assembly 5 And the switching driving member 7 is also in a relatively stable state, so as to maintain the stability of the nail head after it is closed. Hold the firing handle 3 at this moment, and the stapler can be fired by driving the rack 21 .

As shown in FIGS. 7 to 11 , the first driving part 72 is a driving arm extending from the first sheath part 71 toward the distal side of the stapler. The third pivot portion 413 of the first rod 41 is provided with two second driving parts 46, and the switching driving part 7 includes two first driving parts 72, and the two first driving parts 72 are opposite to the The axial symmetry of the stapler is set. As shown in FIGS. 7-10 , the first closing member 51 and the second closing member 52 are two separate parts, and the proximal side of the first closing member 51 enters the second closing member at least partially. The second sheath portion 521 of the closure member 52 cooperates with the stepped surface inside the second sheath portion 521 to form an axially fixed and relatively rotatable fit. The guiding portion 5221 is a protruding bar disposed on the side of the third driving portion 522 . A matching hole 5222 is provided at a distal side of the third driving part 522 for installing the third pin shaft 45 . The inside of the first closing member 51 is provided with a spring matching step surface 512 , and one end of the closing return spring 61 is opposed to the spring matching step surface 512 . As shown in FIG. 12 , a spring fitting groove 711 is disposed on the distal surface of the first outer casing portion 71 , and one end of the switching return spring 62 is disposed in the spring fitting groove 711 .

In other alternative embodiments, the first closing member 51 and the second closing member 52 may also be integrally provided. In other alternative embodiments, the second driving part 46 can also be in other shapes, and the number of the second driving part 46 and the first driving part 72 is not limited to two, for example, only one first driving part 72 is provided. Two driving parts 46 and a first driving part 72 . The installation position and manner of the closing return spring 61 and the switching return spring 62 may also be different from this embodiment. In other alternative embodiments, the second driving portion 46 may also be disposed on the fourth pivot portion 423 , or disposed on other positions of the first rod 41 or the second rod 42 . In other alternative embodiments, the guide portion 5221 may also be set as a boss or other structures.

In the state shown in FIG. 6 , the stapler can be fired by holding the firing handle 3 . During the firing process of the stapler, under the action of the stable state of the connecting rod assembly 4 itself and under the holding action of the closing return spring 61 and the switching return spring 62, the connecting rod assembly 4 and the closing pull rod assembly 5 and the state of the switching driving member 7 will not change, that is, the connecting rod assembly 4 remains in the second state, the switching driving member 7 remains in the second position area, and the closing pull tab 12 will not accidentally move axially Play to keep the nail head firmly closed. After the firing of the stapler is completed, when the nail head needs to be opened, the operator operates the operating part 73 protruding from the outside of the housing 13 to drive it to move in the direction of the distal end, so that the switching driving member 7 moves from the second position area to the stapler. The distal side of the switch moves to the first position area, compressing the switching return spring 62, so that the axial length of the switching return spring 62 is shortened to the initial length L21, and enters the state of FIG. 13 . The first driving part 72 moves to the top of the second driving part 46 in the direction of the distal end, and gives the second driving part 46 a motion along the fourth direction (the downward direction in FIG. 13 , that is, the direction away from the connecting rod 18). Under the action force, the third pivot portion 413 and the fourth pivot portion 423 move downward under the force, and enter the state shown in FIG. 14 , that is, the connecting rod assembly 4 returns to the original first state. As shown in Figure 7 and Figure 11, in this embodiment, the distal end side of the first driving part 72 is provided with a first guide surface 721, the upper side of the first guide surface 721 is compared to the lower side The edge is inclined toward the distal end side, and the proximal end side of the second driving part 46 is provided with a second guide surface 461 , and the inclination direction of the second guide surface 461 is the same as that of the first guide surface 721 . By setting the first guide surface 721 and the second guide surface 461, when the first drive part 72 moves from the second position area to the first position area, the first drive part 72 can move more smoothly. Contacts the second driving part 46 and presses the second driving part 46 downward.

Comparing Fig. 13 and Fig. 14, it can be seen that, in the process of returning the link assembly 4 from the second state to the first state, the first lever 41 rotates clockwise around the first pivot 43, and the first lever 41 The two levers 42 rotate counterclockwise around the second pivot 44 . The second pivoting part 422 moves in the direction of the distal end, and drives the third driving part 522 of the second closing member 52 to move in the direction of the distal end. The driving action of the second pivoting part 422 and the Under the elastic reset action of the closing return spring 61 , the second sheath portion 521 moves in the direction of the distal end to abut against the switching driving member 7 again, and the closing return spring 61 re-extends to the original length L11 . The second closing member 52 drives the closing pull piece 12 to move toward the distal side through the first closing member 51 , so that the nail head can be opened. Therefore, after the firing of the stapler is completed, by operating the operating portion 73 of the switching drive member 7 to move in the direction of the distal end, the link assembly 4 can be driven from the second state to the first state, and the closing rod assembly 5 can be driven to the distal end. Move sideways to open the nail head, so that manual opening of the nail head can be realized, the structure is simple, and the operation is convenient.

Further, in the second embodiment and the third embodiment of the present invention, the structure of the switching driving member is different from that of the first embodiment. Specifically, the switching driving member can be rotatably arranged relative to the closing rod assembly, and when the connecting rod assembly is in the second state and the switching driving member is operated to rotate in the fifth direction, it can drive the The connecting rod assembly enters the first state from the second state, and drives the closing pull rod assembly to move toward the distal end side to open the nail head. Similarly, the connecting rod assembly can be driven to switch between different states by operating the switching drive member, and the closing pull rod assembly can be controlled to move axially along the stapler, thereby controlling the closing and opening of the nail head. The structure is simple and easy to use.

As shown in FIGS. 15-23 , the second embodiment of the present invention provides a closing switching mechanism for a medical stapler and a medical stapler including the closing switching mechanism. The main components of the stapler and the switching of the open and closed states of the nail head can be referred to the description in the first embodiment with reference to FIG. 1 and FIG. 2 , and will not be repeated here.

As shown in FIGS. 15-19 , the closing switching mechanism includes a link assembly 4 , a switching driving member 7 and a closing pull rod assembly 50 . The link assembly 4 includes a first rod 41 and a second rod 42, the second rod 42 is located on the proximal side of the first rod 41, and the first rod 41 includes a first pivot portion 412 and a second rod 41. Three pivotal joints 413 , the second rod 42 includes a second pivotal joint 422 and a fourth pivotal joint 423 . The connection relationship between the connecting rod assembly 4 and the closing rod assembly 50 is the same as that of the first embodiment, and will not be repeated here. The closing rod assembly 50 is fixedly connected to the proximal side of the closing pull piece 12 , so that the axial movement of the closing pull rod assembly 50 can drive the axial movement of the closing pull piece 12 . The switch driving member 7 is pivotally connected to the closing rod assembly 50, and the pivot connection position between the switching driving member 7 and the closing rod assembly 50 is in the axial direction of the stapler relative to the closing rod assembly 50. fixed. Here, being fixed in the axial direction of the stapler means that the pivotal connection position of the switching drive member 7 and the closing rod assembly 50 will not be displaced in the axial direction relative to the closing rod assembly 50 . The switching driving member 7 can move in a first direction and a second direction, and the first direction and the second direction are two opposite directions.

In this embodiment, the link assembly 4 includes a first state and a second state, both of which are relatively balanced states. The switching drive 7 comprises a first position area and a second position area. In the initial state, the link assembly 4 is in the first state, and the link assembly 4 is in a relatively compact state, that is, the shaft between the first pivot portion 412 and the second pivot portion 422 If the direction distance is small, the switching drive member 7 is in the first position area. When it is necessary to drive the nail head to close, by driving the switching drive member 7 to move toward the first direction, the closing rod assembly 50 is driven to move toward the first direction, and the second pivot joint 422 is driven toward the first direction. movement, the third pivotal part 413 and the fourth pivotal part 423 move towards the third direction, and the link assembly 4 enters the second state, at this time, the link assembly 4 enters a relatively stretched state , the axial distance between the first pivotal portion 412 and the second pivotal portion 422 increases, and at the same time, the closing pull rod assembly 50 drives the closing pull piece 12 to move in the first direction to close nail head. When the switching driving member 7 moves to the second position area, the nail head is closed.

After the nail head is closed, the connecting rod assembly 4 is in the relatively stable second state, and the switching drive member 7 is located in the second position area. At this time, the holding of the connecting rod assembly 4 Under the action, the stability of the closure of the nail head can be maintained, and the firing of the stapler can be performed. When the stapler is fired, the closure tab 12 will not accidentally move and affect the stability of the nail head closure. After the firing of the stapler is completed, when the nail head needs to be opened, the switching driving member 7 is operated to rotate in the fifth direction relative to the closing rod assembly 50, and the switching driving member 7 drives the connecting rod assembly 50 to the fourth direction. The rod assembly 4 can drive the link assembly 4 to enter the first state from the second state, and the second pivot portion 422 of the link assembly 4 drives the closing rod assembly 50 to move in the second direction, and the closing rod assembly 50 can Drive the switching drive member 7 to move in the second direction and return to the first position area, and at the same time, the closing pull rod assembly 50 drives the closing pull piece 12 to move in the direction of the distal end to open the nail head, so that The manual opening of the nail head has simple structure and convenient operation.

The structure and working principle of the closing switching mechanism of the second embodiment will be described in detail below with reference to FIGS. 15-23 . In this embodiment, the second location area is located proximally of the first location area. Both the first direction and the second direction are along the axial direction of the stapler. Specifically, the first direction is toward the proximal side of the stapler (direction S1 in FIG. 15 ), and the second direction is toward the distal side of the stapler (direction opposite to S1). When the switching driving member 7 moves from the first position area to the proximal side, it can drive the nail head to close, and when the switching driving member 7 moves from the second position area to the distal side, it can drive the nail head to open. department. The first position area refers to the position area where the switching drive member 7 is located in the initial state as shown in Figure 19, and the second position area refers to the completion of the nail head closure as shown in Figure 21 Afterwards, the position area where the driving member 7 is located is switched.

As shown in FIGS. 15-19 , the closing switching mechanism further includes a connecting rod 18 . The closing pull piece 12 passes through the inside of the connecting rod 18 . In this embodiment, the third direction is the direction from bottom to top in the viewing angle of FIG. direction. The fourth direction is a direction from top to bottom in the perspective of FIG. 15 , that is, for the third pivotal portion 413 and the fourth pivotal portion 423 , the direction away from the connecting rod 18 . As shown in FIG. 19 , it is a schematic structural diagram of the closing switching mechanism in the initial state of this embodiment. In the state of FIG. 19 , the third pivotal portion 413 and the fourth pivotal portion 423 are in a position relatively far away from the connecting rod 18, and the connecting rod assembly 4 is in a relatively stable first state. , the axial distance between the first pivotal portion 412 and the second pivotal portion 422 is small. The switching drive 7 is in the first position range.

As shown in FIG. 20 , the switching driving member 7 includes an operating part 73 , a first driving part 72 , a first outer casing part 71 and a rotating matching part 75 , and the operating part 73 is connected to the first outer casing part 71 . The operation part 73 is connected to the first outer casing part 71 . The housing 13 is correspondingly provided with an accommodating groove for accommodating the operating portion 73 , the operating portion 13 partially enters the interior of the accommodating groove, is movable relative to the accommodating groove, and protrudes beyond the end of the stapler body 1 . The outer surface of the housing 13 is convenient for the operator to use. The first sleeve portion 71 is sheathed on the outside of the closing rod assembly 50 and can move axially relative to the connecting rod 18 . The first driving part 72 is located on the side of the first outer casing part 71 facing the connecting rod assembly 4 , and the rotation matching part is arranged between the first driving part 72 and the first outer casing part 71 75 , the rotating fitting part 75 is pivotally connected to the closing rod assembly 5 through a rotating shaft 5023 , and the rotating fitting part 75 is provided with a second fitting hole 751 passing through the rotating shaft 5023 . The first driving part 72 is a driving arm extending from the rotating matching part 75 to the distal end of the stapler, and the rotating matching part 75 is connected to the first driving part 72 and the second driving part 72. A bent portion between the jacket portions 71 . A fixed angle is set between the first driving part 72 and the first outer sleeve part 71, that is, the rotating matching part 75 is a bent part that will not deform, and preferably has a certain rigidity, so that the first The included angle (for example, a right angle, or an angle smaller than a right angle or greater than a right angle) between a driving part 72 and the first sheath part 71 remains unchanged. A second driving portion 411 is disposed at the third pivot portion 413 of the first rod 41 , and the second driving portion 411 includes a mating surface facing the connecting rod 18 . In the initial state, the second driving part 411 is located at a position relatively far away from the connecting rod 18 along with the third pivot part 413, and will not contact the first driving part 72. The first driving part 72 The part 72 will not apply force to the second driving part 411.

As shown in FIG. 15 , FIG. 17 and FIG. 20 , the closing rod assembly 50 includes a second outer casing part 501 and a third driving part 502 . The second sheath portion 501 is sheathed on the outside of the connecting rod 18, the second sheath portion 501 includes a distal portion and a proximal portion, the outer diameter of the distal portion is smaller than the outer diameter of the proximal portion, so A switching mating surface 5013 is provided between the distal portion and the proximal portion of the second sheath portion 501 . The distal end portion of the second sheath portion 501 is at least partially passed through the inside of the first sheath portion 71 of the switching fitting 7 , and the switching mating surface 5013 of the second sheathing portion 501 is in contact with the first sheathing portion. 71 of the proximal surface to match. The distal side of the second sheath part 501 is provided with a through hole 5011, and the connecting pin 19 passed through the through hole 5011 of the second sheath part 501 can connect the distal side of the second sheath part 501 with the The proximal side of the closure pull tab 12 is fixedly connected. A first end of the third driving part 502 is pivotally connected to the second pivot part 422 of the second rod 42 , and a second end of the third driving part 502 is connected to the second outer sleeve part 501 . The rotation shaft 5023 passes through the third driving part 052 , and is pivotally connected with the rotation matching part 75 of the switching driving part 7 through the rotation shaft 5032 . One or two guiding parts 5021 are provided on the side of the third driving part 502 . The inner surface of the shell 13 of the stapler body 1 is provided with one or two guide grooves (refer to the guide groove 131 in Fig. 3 of the first embodiment), the guide grooves extend in the axial direction, and the guide grooves The part 521 at least partially enters the guide groove, and can move along the extending direction of the guide groove. The cooperation of the guide portion 5021 and the guide groove limits the movement of the closing rod assembly 50 only in the axial direction. In other alternative embodiments, a guide part may also be provided on the inner surface of the casing 13 of the stapler body 1, and a guide groove may be provided on the side of the third driving part 502, which also belongs to the protection scope of the present invention. Inside.

As shown in FIG. 16 , FIG. 18 and FIG. 20 , a stopper portion 14 is provided inside the casing 13 of the stapler body 1 . A closing biasing member is disposed between the closing rod assembly 50 and the stopper portion 14 , and the closing biasing member gives the closing rod assembly 50 a first biasing force toward the distal side. In this embodiment, the closing biasing member is a closing return spring 61 , and can optionally be a compression spring disposed on the proximal side of the closing rod assembly 50 . A spring matching stepped surface 5012 is disposed inside the second outer casing portion 501 of the closing rod assembly 50 , and the closing return spring 61 is disposed between the spring fitting stepped surface 5012 and the stopper portion 14 . In other alternative implementations, the closing biasing member may also be an elastic piece, a tension spring disposed on the distal side of the closing rod assembly 50 or other types of elastic members.

In the state shown in FIG. 19 , when the connecting rod assembly 4 is in the first state, the closing return spring 61 basically does not deform or only slightly deforms. Under the action of the first biasing force of the closing return spring 61 , the closing pull rod assembly 50 is kept at the initial position, and the switching driving member 7 is kept in the first position area. By means of the closing return spring 61 , the state stability of the closing switch mechanism can be further maintained when no external force is applied.

In the state shown in FIG. 19 , operating the operating portion 73 of the switching driving member 7 makes the switching driving member 7 move from the first position area to the first direction, and the rotation matching portion 75 of the switching driving member 7 The rotating shaft 5023 is axially fixed with the third driving part 502 , therefore, the switching driving part 7 can drive the third driving part 502 to move in the first direction. And because the switching mating surface 5013 of the second sheathing part 501 cooperates with the proximal end surface of the first sheathing part 71, the first sheathing part 71 can also act on the switching mating surface 5013, thus The switching driving member 7 applies a more uniform force toward the proximal side to the closing rod assembly 50, and drives the closing rod assembly 50 to move in the first direction, that is, to move toward the proximal side of the stapler. The closing rod assembly 50 drives the second pivoting part 422 to move in the first direction through the third driving part 502 . The third pivot portion 413 and the fourth pivot portion 423 move toward the third direction, that is, move upward and approach the connecting rod 18 , and the first rod 41 rotates counterclockwise around the first pivot 43 Rotate, the second lever 42 rotates clockwise around the third pivot 45, the linkage assembly 4 enters the second state, the first pivot 412 and the second pivot 422 The axial distance increases. At this time, the state of the closed switching mechanism is shown in FIG. 21 . Comparing FIG. 21 and FIG. 19 , it can be seen that the switching driving member 7 moves to the proximal direction to the second position area, and the closing rod assembly 50 compresses the closing return spring 61 to generate elastic deformation. At the same time, because the third driving part 502 moves toward the proximal side, the second outer sleeve part 501 drives the closing pull tab 12 to move toward the proximal side, closing the nail head. In the state of FIG. 21 , the first driving part 72 is located on the side of the second driving part 411 facing the connecting rod 18, and the first driving part 72 is opposite to the second driving part 411. There is a certain height gap between the surfaces in the longitudinal direction (ie, S2 direction), so the first driving part 72 will not act on the second driving part 411 . Here, between the opposite surfaces of the first driving part 72 and the second driving part 411 refers to between the lower surface of the first driving part 72 and the upper surface of the second driving part 411 . At this time, the connecting rod assembly 4 is in a relatively stable second state, and under the action of the connecting rod assembly 4, the closing pull rod assembly 50 and the switching driving member 7 are also in a relatively stable state , so as to maintain the stability of the nail head after it is closed. At this time, hold the firing handle 3, and the stapler can be fired by driving the rack in the stapler body (refer to the rack 21 in FIG. 3 of the first embodiment).

As shown in Figure 20 and Figure 22, the third pivotal part 413 of the first lever 41 is provided with the second drive part 411, the switching drive member 7 includes two first drive parts 72, the first The second driving portion 411 includes two mating surfaces opposite to the two first driving portions 72 , and the two mating surfaces are respectively located on the left and right sides of the fourth pivot portion 423 . The two first driving parts 72 are arranged symmetrically with respect to the axial direction of the stapler, and are arranged corresponding to the two mating surfaces of the second driving part 411 . The guide part 5021 is a convex line provided on the side of the third drive part 502 , and one guide part 5021 can be provided on the left and right sides of the third drive part 502 . The distal side of the third driving part 502 is provided with a first matching hole 5022 for installing the third pin shaft 45 .

In other alternative implementations, the number of the first driving part 72 is not limited to two, for example, only one first driving part 72 is provided. The installation position and manner of the closing return spring 61 and the switching return spring 62 may also be different from this embodiment. In other alternative implementations, the second driving part 411 can also be arranged on the fourth pivot part 423 , or be arranged on other positions of the first rod 41 or the second rod 42 . In other alternative implementation manners, the guide part 5021 may also be set as a boss or other structures.

As shown in Fig. 20 and Fig. 21, a switching biasing member is provided between the switching driving member 7 and the closing rod assembly 50, and when the switching driving member 7 rotates in the fifth direction, the switching biasing member Elastic deformation occurs, and a second biasing force to rotate in the sixth direction is given to the switching driving member 7 . When the switching driving member 7 is not subjected to external force, the proximal end surface of the switching driving member 7 at least partially bears against the closing rod assembly 50, specifically, the first outer sleeve portion 71 of the switching driving member 7 The proximal surface is at least partially abutted against the switching matching surface 5013 of the second outer sleeve portion 501 of the closing rod assembly 50 . Specifically, a second spring installation portion 74 is provided on the surface of the first outer sleeve portion 71 of the switching driving member 7, and a first spring installation portion 5014 is provided on the proximal end portion of the first outer sleeve portion 501 of the closing rod assembly 50. , the switch biasing member is a switch return spring 62, and can optionally be a tension spring. Two ends of the switching return spring 62 are installed on the first spring installation part 5014 and the second spring installation part 74 respectively. In this embodiment, the first spring installation part 5014 and the second spring installation part 74 are respectively a boss protruding from the surface of the second outer casing part 501 and a post protruding from the surface of the first outer casing part 71. Boss. But the present invention is not limited thereto. In other alternative implementations, the switching biasing member can also be a torsion spring sleeved on the rotating shaft 5023, or the switching biasing member is a tension spring or a compression spring, and both ends are fixed on Other positions of the switching drive member 7 and the closing rod assembly 50 . In this embodiment, two switching biasing members are provided, and the two switching biasing members are arranged symmetrically with respect to the axial direction of the stapler so as to act on the switching driving member 7 more uniformly. However, the present invention is not limited thereto. In other alternative implementation manners, for example, only one switching bias member or more switching bias members may be provided.

In the state shown in FIG. 21 , the stapler can be fired by holding the firing handle 3 . During the firing process of the stapler, under the action of the stable state of the link assembly 4 itself, the states of the link assembly 4, the closing rod assembly 50 and the switching drive member 7 will not change, that is, the link assembly 4 remains In the second state, the switching driving member 7 remains in the second position area, and the closing pull piece 12 will not move accidentally in the axial direction, so as to keep the nail head closed stably. After the firing of the stapler is completed, when the nail head needs to be opened, the operator operates the operating part 73 protruding from the outside of the housing 13 to drive it to move in the direction of the distal end, so that the switching drive member 7 is relatively close to the closing rod assembly 50. Rotate around the rotation axis 5023, and the rotation direction is the fifth direction. In this embodiment, the fifth direction is the S3 direction shown in FIG. 21 , that is, the counterclockwise direction in the viewing angle of FIG. 21 .

As shown in FIG. 23 , when the switching driving member 7 rotates in the fifth direction, the first driving part 72 presses the second driving part 411 in a direction away from the connecting rod 18, so that the second driving part 411 The driving part 411 drives the third pivotal part 413 and the fourth pivotal part 423 to move in a fourth direction, that is, to move away from the connecting rod 18, so that the connecting rod assembly 4 enters the first state . In the process of the connecting rod assembly 4 returning from the second state to the first state, in the perspective of FIG. Rotate counterclockwise around the second pivot 44, the second pivot part 422 moves in the second direction, that is, moves toward the distal side of the stapler, and the second pivot part 422 drives the third The driving part 502 moves in the direction of the distal end, and then drives the switching driving member 7 to also move in the direction of the distal end to the first position area. At the same time, the second jacket part 501 drives the closing pull tab 12 to move toward the distal side, so as to open the nail head. The closing return spring 61 also returns to the initial state, and the first biasing force of the closing return spring 61 further ensures that the closing pull rod assembly 50 can return to the initial position.

Therefore, after the firing of the stapler is completed, by operating the operating portion 73 of the switching drive member 7 to move toward the distal side, the link assembly 4 can be driven from the second state to the first state, and the closing rod assembly 50 can be driven to the distal end. Move sideways to open the nail head, so that manual opening of the nail head can be realized, the structure is simple, and the operation is convenient.

In the state of FIG. 23 , the switching return spring 62 (not shown in the figure) is elongated and elastically deformed. At this time, the operator releases the operation part 73, and the operation part 73 loses the effect of external force. Under the action of the second biasing force of the switching return spring 62, the switching driving member 7 rotates along the sixth direction and returns to the initial position (that is, the position and state of the switching driving member 7 shown in FIG. 19 ) . In this embodiment, the sixth direction is the S4 direction shown in FIG. 23 , that is, the clockwise direction in the viewing angle of FIG. 23 .

As shown in FIG. 24, in the third embodiment of the present invention, the second driving part of the linkage assembly 4 may be a raised part 414 provided at the third pivot part 413, and the raised part 414 protrudes in the direction of the connecting rod 18 relative to the first rod 41 . When the connecting rod assembly 4 is in the second state and the switching driving member 7 is not rotated by external force, there is a certain distance between the lower surface of the first driving part 72 and the top end of the protruding part 414 . The height gap, the switching drive member 7 will not act on the raised portion 414 . When the connecting rod assembly 4 is in the second state and the switching driving member 7 rotates in the fifth direction, the first driving portion 72 of the switching driving member 7 directly acts on the protrusion 414 , give the protruding portion 414 a force away from the connecting rod 18, so that the connecting rod assembly 4 returns to the first state. In another alternative embodiment, the protruding portion 414 may also be arranged at the fourth pivot joint or other positions of the link assembly 4, and the shape of the protruding portion 414 is not limited to that shown in FIG. The shape shown in 24. The structures of other components in this embodiment are the same as those of the components in the second embodiment shown in FIGS. 15-21 , and will not be repeated here.

Further, in the fourth and fifth embodiments of the present invention, the structure of the switching driving member is different from that of the first embodiment. Specifically, the switching driving member is fixed in the axial direction relative to the closing rod assembly, and the switching driving member can move in a third direction relative to the closing rod assembly, and the third direction is the same as the closing rod assembly. A fixed angle is set between the first direction or the second direction. When the connecting rod assembly is in the second state, and the switching driving member moves in the third direction relative to the closing rod assembly, the switching driving member drives the connecting rod assembly into the first state, and the second pivotal part drives the closing pull rod assembly and the switching driving member to move in the second direction, and the closing pull rod assembly can drive the closing pull piece to open the nail head. Therefore, by operating the switch drive member, the link assembly can be driven to switch between different states, and the closing rod assembly can be controlled to move axially along the stapler, thereby controlling the closing and opening of the nail head. The structure is simple and easy to use.

As shown in FIGS. 25-33 , the fourth embodiment of the present invention provides a closing switching mechanism for a medical stapler and a medical stapler including the closing switching mechanism. The main components of the stapler and the switching of the open and closed states of the nail head can be referred to the description in the first embodiment with reference to FIG. 1 and FIG. 2 , and will not be repeated here.

As shown in FIGS. 25-29 , the closing switching mechanism includes a link assembly 4 , a switching driving member 7 and a closing pull rod assembly 50 . The link assembly 4 includes a first rod 41 and a second rod 42, the second rod 42 is located on the proximal side of the first rod 41, and the first rod 41 includes a first pivot portion 412 and a second rod 41. Three pivotal joints 413 , the second rod 42 includes a second pivotal joint 422 and a fourth pivotal joint 423 . The matching structure of the first rod 41 and the second rod 42 and the closing rod assembly 50 is the same as that of the first embodiment, and will not be repeated here. The closing rod assembly 50 is fixedly connected to the proximal side of the closing pull piece 12 , so that the axial movement of the closing pull rod assembly 50 can drive the axial movement of the closing pull piece 12 . The switching driving member 7 is fixed in the axial direction of the stapler relative to the closing rod assembly 50, and the switching driving member 7 can move in a seventh direction relative to the closing rod assembly 50, and the seventh direction A fixed angle is set between the first direction or the second direction. Here, being fixed in the axial direction of the stapler means that the switching driving member 7 will not be displaced in the axial direction relative to the closing rod assembly 50 . The switching driving member 7 can move in a first direction and a second direction, and the first direction and the second direction are two opposite directions. And when the switching driving member 7 moves in the axial direction, the closing rod assembly 50 also moves in the axial direction together with the switching driving member 7 .

In this embodiment, the link assembly 4 includes a first state and a second state, both of which are relatively balanced states. The switching drive 7 comprises a first position area and a second position area. As shown in FIG. 28 and FIG. 29 , in the initial state, the linkage assembly 4 is in the first state, and the linkage assembly 4 is in a relatively compact state, that is, the first pivot portion 412 and the second The axial distance between the two pivotal parts 422 is relatively small, and the switching driving member 7 is in the first position area. When it is necessary to drive the nail head to close, by driving the switching drive member 7 to move toward the first direction, the closing rod assembly 50 is driven to move toward the first direction, and the second pivot joint 422 is driven toward the first direction. movement, the third pivot portion 413 and the fourth pivot portion 423 rotate relatively, and the link assembly 4 enters the second state. As shown in FIG. 31 and FIG. 32 , at this time, the connecting rod assembly 4 enters a relatively stretched state, the axial distance between the first pivotal portion 412 and the second pivotal portion 422 increases, and The first pivot portion 412 has no axial displacement relative to the stapler body 1 . At the same time, the closing pull rod assembly 50 drives the closing pull piece 12 to move in the first direction to close the nail head. When the switching driving member 7 moves to the second position area, the nail head is closed.

After the nail head is closed, the connecting rod assembly 4 is in the relatively stable second state, and the switching drive member 7 is located in the second position area. In this way, the stability of the closure of the nail head can be maintained, and the firing of the stapler can be performed. When the stapler is fired, the closure tab 12 will not accidentally move and affect the stability of the nail head closure. After the firing of the stapler is completed, when the nail head needs to be opened, the switching drive member 7 is operated to move in the seventh direction relative to the closing pull rod assembly 50 to drive the connecting rod assembly 4 from the second state to the first state. state, the second pivot portion 422 of the link assembly 4 drives the closing rod assembly 50 to move in the second direction, and the closing rod assembly 50 can drive the switching driving member 7 to move in the second direction and return to the first At the same time, the closing pull rod assembly 50 drives the closing pull piece 12 to move toward the distal side to open the nail head, so that the nail head can be opened manually, with simple structure and convenient operation.

The structure and working principle of the closing switching mechanism of the fourth embodiment will be described in detail below with reference to FIGS. 25-33 . In this embodiment, the second location area is located proximally of the first location area. Both the first direction and the second direction are along the axial direction of the stapler. Specifically, the first direction is toward the proximal side of the stapler (direction S1 in FIG. 25 ), and the second direction is toward the distal side of the stapler (direction opposite to S1). When the switching driving member 7 moves from the first position area to the proximal side, it can drive the nail head to close, and when the switching driving member 7 moves from the second position area to the distal side, it can drive the nail head to open. department. The first position area refers to the position area where the switching drive member 7 is located in the initial state as shown in Figure 29, and the second position area refers to the completion of the nail head closure as shown in Figure 32 Afterwards, the position area where the driving member 7 is located is switched.

As shown in FIGS. 25-29 , the closing switching mechanism further includes a connecting rod 18 . The closing pull piece 12 passes through the inside of the connecting rod 18 . In this embodiment, the seventh direction is the direction from top to bottom in the viewing angle of FIG. direction. The included angle between the seventh direction and the first direction is a right angle or an angle close to a right angle, and the switching driving member 7 moves in an up and down direction relative to the closing rod assembly 50 . A third direction is defined here, and the third direction is the direction from bottom to top in the viewing angle of FIG. 18 directions. Both the third direction and the fifth direction are perpendicular to the axial direction of the stapler, defined here as the longitudinal direction, and the two directions are opposite. As shown in FIG. 29 , it is a schematic structural diagram of the closing switching mechanism in the initial state of this embodiment. In the state of FIG. 29 , the third pivotal portion 413 and the fourth pivotal portion 423 are in a position relatively far away from the connecting rod 18, and the connecting rod assembly 4 is in a relatively stable first state. , the axial distance between the first pivotal portion 412 and the second pivotal portion 422 is small. The switching drive 7 is in the first position range.

As shown in FIG. 29 and FIG. 30 , the switching driving member 7 includes an operating part 73 , a first driving part 72 , a first connecting part and a connecting matching part 76 . The operation part 73 is connected to the first connection part. In this embodiment, the first connecting portion is the first outer casing portion 71 . The housing 13 is correspondingly provided with an accommodating groove for accommodating the operating portion 73 , the operating portion 13 partially enters the interior of the accommodating groove, is movable relative to the accommodating groove, and protrudes beyond the end of the stapler body 1 . The outer surface of the housing 13 is convenient for the operator to use. The first sleeve portion 71 is sheathed on the outside of the closing rod assembly 50 and can move axially relative to the connecting rod 18 . The first driving part 72 and the connecting fitting part 76 are located on the side of the first outer sleeve part 71 facing the link assembly 4 , and the connecting fitting part 76 is located at the proximal end of the first driving part 72 side. A second driving portion 46 is disposed at the third pivot portion 413 of the first rod 41 . In the initial state, the second driving part 46 is located at a position relatively away from the connecting rod 18 along with the third pivot part 413, and will not contact the first driving part 72, and the first driving part 72 The portion 72 will not apply force to the second driving portion 46 . In this embodiment, the second driving part 46 is integrated with the second pin, that is, the second driving part 46 is partly passed through the third pivot part 413 and the fourth pivot part 423 , so that the third pivotal part 413 and the fourth pivotal part 423 are pivotally connected, and the part of the second driving part 46 protrudes from the outside of the third pivotal part 413 and the fourth pivotal part 423 The surface is opposite to the first driving part 72 .

As shown in FIG. 25 , FIG. 27 and FIG. 30 , the closing rod assembly 50 includes a second outer casing part 501 and a third driving part 502 . The second sheath portion 501 is sheathed on the outside of the connecting rod 18, the second sheath portion 501 includes a distal portion and a proximal portion, the outer diameter of the distal portion is smaller than the outer diameter of the proximal portion, so A switching mating surface 5013 is provided between the distal portion and the proximal portion of the second sheath portion 501 . The distal end portion of the second sheath portion 501 is at least partially passed through the inside of the first sheath portion 71 of the switching fitting 7 , and the switching mating surface 5013 of the second sheathing portion 501 is in contact with the first sheathing portion. 71 of the proximal surface to match. Preferably, the proximal surface of the first sheath part 71 and the switching mating surface 5013 of the second sheath part 501 abut against each other. The distal side of the second sheath part 501 is provided with a through hole 5011, and the connecting pin 19 passed through the through hole 5011 of the second sheath part 501 can connect the distal side of the second sheath part 501 with the The proximal side of the closure pull tab 12 is fixedly connected. A first end of the third driving part 502 is pivotally connected to the second pivot part 422 of the second rod 42 , and a second end of the third driving part 502 is connected to the second outer sleeve part 501 . One or two guiding parts 5021 are provided on the side of the third driving part 502 . The inner surface of the shell 13 of the stapler body 1 is provided with one or two guide grooves 131, the guide grooves 131 extend in the axial direction, the guide part 5021 at least partially enters the guide grooves 131, and can Move along the extending direction of the guide groove 131 . The cooperation of the guide portion 5021 and the guide groove 131 limits the movement of the closing pull rod assembly 5 only in the axial direction. In other alternative embodiments, a guide part may also be provided on the inner surface of the casing 13 of the stapler body 1, and a guide groove may be provided on the side of the third driving part 502, which also belongs to the protection scope of the present invention. Inside.

As shown in FIG. 29 and FIG. 30 , the switch driving member 7 and the closing rod assembly 50 are connected through the cooperation of the boss and the sliding groove. Specifically, the connecting and matching part 76 is provided with a sliding slot 761, and the sliding slot 761 extends along the seventh direction, and the third driving part 502 is provided with a protruding post 503, and the protruding post 503 at least partially enters the The inside of the chute 761 and can move along the extending direction of the chute 761 , that is, the protrusion 503 can move relative to the chute 761 along the longitudinal direction of the stapler. The chute 761 includes a first section 7611 and a second section 7612 , the first section 7611 is located below the second section 7612 . In the initial state shown in FIG. 29 , the protrusion 503 is located at the first section 7611 of the slide groove 761 . When the switching driving member 7 is operated to move downward by the operating portion 73 , the protrusion 503 enters the second section 7612 of the slide groove 761 . In another alternative embodiment, the boss 503 can also be arranged on the second outer casing part 501, and in yet another embodiment, the boss 503 can also be arranged on the connection matching part 76, so The third driving part 502 or the second outer casing part 501 is provided with a chute extending along the seventh direction, and the protrusion at least partially enters the chute.

As shown in FIG. 25 and FIG. 29 , the housing 13 of the stapler body 1 is provided with a stopper 14 inside, and the stopper 14 is located on the proximal side of the second outer sleeve 501 . A closing biasing member is disposed between the closing rod assembly 50 and the stopper portion 14 , and the closing biasing member gives the closing rod assembly 50 a first biasing force toward the distal side. In this embodiment, the closing biasing member is a closing return spring 61 , and can optionally be a compression spring disposed between the second outer sleeve portion 501 of the closing rod assembly 50 and the stopper portion 14 . In other alternative implementations, the closing biasing member may also be an elastic piece, a tension spring disposed on the distal side of the closing rod assembly 50 or other types of elastic members.

In the state shown in FIG. 29 , when the connecting rod assembly 4 is in the first state, the closing return spring 61 basically does not deform or only slightly deforms. Under the action of the first biasing force of the closing return spring 61 , the closing pull rod assembly 50 is kept at the initial position, and the switching driving member 7 is kept in the first position area. By means of the closing return spring 61 , the state stability of the closing switch mechanism can be further maintained when no external force is applied.

In the state shown in FIG. 29 , the operating portion 73 of the switching drive member 7 is operated, so that the switch drive member 7 moves from the first position area to the proximal side, and the connection matching portion of the switch drive member 7 The sliding groove 761 of 76 cooperates with the boss 503 to drive the third driving part 502 to move toward the proximal side. And because the switching mating surface 5013 of the second sheathing part 501 cooperates with the proximal end surface of the first sheathing part 71, the first sheathing part 71 can also act on the switching mating surface 5013, thus The switching driving member 7 applies a more uniform force toward the proximal side to the closing rod assembly 50, and drives the closing rod assembly 50 to move in the first direction, that is, to move toward the proximal side of the stapler. The closing rod assembly 50 drives the second pivoting part 422 to move along the first direction through the third driving part 502 . The third pivotal part 413 and the fourth pivotal part 423 move along the third direction, that is, move upwards and approach the connecting rod 18 , and the first rod 41 goes counterclockwise around the first pivot 43 Rotate, the second lever 42 rotates clockwise around the third pivot 45, the linkage assembly 4 enters the second state, the first pivot 412 and the second pivot 422 The axial distance increases. At this time, the state of the link assembly 4 is shown in FIG. 31 , and the state of the closing switching mechanism is shown in FIG. 32 . Comparing FIG. 32 and FIG. 29 , it can be seen that the switching driving member 7 moves to the proximal direction to the second position area, and the closing rod assembly 50 compresses the closing return spring 61 to generate elastic deformation. At the same time, because the third driving part 502 moves toward the proximal side, the second outer sleeve part 501 drives the closing pull tab 12 to move toward the proximal side, closing the nail head. In the state of FIG. 32 , the first driving part 72 is located on the side of the second driving part 46 facing the connecting rod 18 , and the first driving part 72 is opposite to the second driving part 46 There is preferably a certain height gap between the surfaces in the longitudinal direction (ie, S2 direction), so that the first driving part 72 will not act on the second driving part 46 . Here, between the surfaces of the first driving part 72 and the second driving part 46 means between the lower surface of the first driving part 72 and the upper surface of the second driving part 46 . At this time, the connecting rod assembly 4 is in a relatively stable second state, and under the action of the connecting rod assembly 4, the closing pull rod assembly 50 and the switching driving member 7 are also in a relatively stable state , so as to maintain the stability of the nail head after it is closed. At this time, the firing handle 3 is held, and the stapler can be fired by driving the rack in the stapler body (for example, referring to the rack 21 in FIG. 3 of the first embodiment).

As shown in FIG. 30 , the third pivotal portion 413 of the first lever 41 is provided with the second drive portion 46 , the switching drive member 7 includes two first drive portions 72 , and the two first drive portions 72 The driving part 72 is arranged symmetrically with respect to the axial direction of the stapler. Both ends of the second driving part 46 protrude from the outer surfaces of the left and right sides of the pivot joint part 413 and are opposite to the two first driving parts 72 . The side of the first driving part 72 facing the second driving part 46 is preferably a plane parallel to the axial direction. The guide part 5021 is a convex line provided on the side of the third drive part 502 , and one guide part 5021 can be provided on the left and right sides of the third drive part 502 . The distal side of the third driving part 502 is provided with a first matching hole 5022 for installing the third pin shaft 45 . The third driving part 502 includes a first cavity 5024 , and the second rod 42 at least partially enters into the first cavity 5024 of the third driving part 502 . Further, the side of the second rod 42 facing the connecting rod 18 is provided with a relief groove 424, when the connecting rod assembly 4 is in the second state, the bottom 5015 of the second outer sleeve part 501 partially enters the connecting rod 18. In the step-off slot 424 mentioned above.

In other alternative implementations, the number of the first driving part 72 is not limited to two, for example, only one first driving part 72 is provided. The installation position and manner of the closing return spring 61 and the switching return spring 62 may also be different from this embodiment. In other alternative embodiments, the second driving part 46 can also be arranged on the fourth pivotal part 423, or on other positions of the first rod 41 or the second rod 42, as long as the first rod 41 or the second rod 42 is satisfied. When the second driving part 46 moves downward, it only needs to drive the third pivotal part 413 and the fourth pivotal part 423 to move downward, or the second driving part 46 may not be integrated with the second pin. , and a second pin shaft and one or more second driving parts 46 are provided separately. In other alternative implementation manners, the guide part 5021 may also be set as a boss or other structures.

As shown in Fig. 30 and Fig. 32, a switching biasing member is provided between the switching driving member 7 and the closing rod assembly 50, and when the switching driving member 7 moves in the seventh direction, the switching biasing member The elastic deformation gives the switching driving member 7 a second biasing force along the third direction. Specifically, a second spring mounting portion 74 is provided on the surface of the connecting fitting portion 76 of the switching driving member 7, a protrusion is provided on the closing rod assembly 50, and a switching return spring 62 is provided as the switching biasing member. , and can optionally be a tension spring. Two ends of the switching return spring 62 are installed on the second spring installation portion 74 and the boss respectively. In this embodiment, the protruding post provided on the closing rod assembly 50 is the protruding post 503 matched with the slide groove 761 , and the second spring installation part 74 is a post provided on the connecting fitting part 76 Body, the second spring mounting portion 74 is located below the boss 503 . Both ends of the switching return spring 62 are respectively hung on the boss 503 and the second spring matching portion 74 . In this embodiment, two switching biasing members are provided, and the two switching biasing members are arranged symmetrically with respect to the axial direction of the stapler so as to act on the switching driving member 7 more uniformly. However, the present invention is not limited thereto. In other alternative implementation manners, for example, only one switching bias member or more switching bias members may be provided. In other alternative embodiments, the spring mounting part and the protruding post 503 provided on the closing rod assembly 503 may also be two separate independent parts. In another alternative embodiment, the switching biasing member is a tension spring or a pressing spring, and both ends are fixed to other positions of the switching driving member 7 and the closing pull rod assembly 50 .

In the state shown in FIG. 32 , the stapler can be fired by holding the firing handle 3 . During the firing process of the stapler, under the action of the stable state of the link assembly 4 itself, the states of the link assembly 4, the closing rod assembly 50 and the switching drive member 7 will not change, that is, the link assembly 4 remains In the second state, the switching driving member 7 remains in the second position area, and the closing pull piece 12 will not move accidentally in the axial direction, so as to keep the nail head closed stably.

As shown in FIG. 33 , after the firing of the stapler is completed, when the nail head needs to be opened, the operator operates the operating part 73 protruding from the outside of the housing 13 to drive it to move in the seventh direction, that is, in the perspective of FIG. 32 , The driving switch driving member 7 moves downward (moves in the direction opposite to the S2 direction), and the first driving part 72 presses the second driving part 46 in a direction away from the connecting rod 18 (along the seventh direction), The second driving part 46 drives the third pivot part 413 and the fourth pivot part 423 to move away from the connecting rod 18 , so that the link assembly 4 enters the first state. In the process of the link assembly 4 returning from the second state to the first state, in the perspective of FIG. Rotate counterclockwise around the second pivot 44, the second pivot part 422 moves in the second direction, that is, moves toward the distal side of the stapler, and the second pivot part 422 drives the third The driving part 502 moves in the direction of the distal end. Since the closing rod assembly 50 and the switch driving member 7 are relatively fixed in the axial direction through the boss 503 and the sliding groove 761, and the switching mating surface 5013 of the closing rod assembly 50 is opposed to the proximal surface of the switching driving member 7, the closing The pull rod assembly 50 further drives the switching driving member 7 to also move in the direction of the distal end to the first position area. At the same time, the second jacket part 501 drives the closing pull tab 12 to move toward the distal side, so as to open the nail head. The closing return spring 61 also returns to the initial state, and the first biasing force of the closing return spring 61 further ensures that the closing pull rod assembly 50 can return to the initial position. At this time, the state of the closed switching mechanism is shown in FIG. 33 .

Therefore, after the firing of the stapler is completed, by operating the operating portion 73 of the switching drive member 7 to move in the seventh direction, the link assembly 4 can be driven from the second state to the first state, and the closing rod assembly 50 can be driven to the distal end side. direction movement to open the nail head, so that the manual opening of the nail head can be realized, the structure is simple, and the operation is convenient.

In the state of FIG. 33 , the sliding slot 761 moves downward relative to the protruding post 503 as a whole, and the protruding post 503 enters into the second section 7612 of the sliding slot 761 . As the distance between the boss 503 and the spring mounting portion 74 increases, the switching return spring 62 is elongated and elastically deformed. At this time, the operator releases the operation part 73, and the operation part 73 loses the effect of external force. Under the action of the second biasing force of the switching return spring 62, the switching driving member 7 moves along the third direction (that is, moves upward) and returns to the initial position (that is, the switching driving member 7 shown in FIG. 29 position and state), the boss 503 re-enters the first section 7611 of the slide groove 761 .

As shown in FIGS. 34 to 38 , they are structural schematic diagrams of the closing switching mechanism of the fifth embodiment of the present invention. The difference between the fifth embodiment and the fourth embodiment is that: in the fifth embodiment, the moving direction when the switching driving member 7 drives the nail head to open is different from that of the fourth embodiment. In the fifth embodiment, the definition of the seventh direction is opposite to that of the fourth embodiment. In the viewing angle of FIG. 34 , the direction S2 is the seventh direction, that is, the upward direction, and the direction opposite to the direction S2 is the fourth direction, that is, the downward direction. When the link assembly 4 is in the second state and the switching driving member 7 moves in the seventh direction, the switching driving member 7 lifts the second driving part 46 upward, so that the third pivotal part 413 and the fourth pivot portion 423 move downwards (moving along the fourth direction), and move away from the connecting rod 18 to enter the first state.

The structure and working distance of the closing switching mechanism of the fifth embodiment will be described in detail below with reference to FIGS. 34 to 38 . As shown in FIG. 34 , it is a schematic structural diagram of the closing switching mechanism when the link assembly 4 of this embodiment is in the first state. In this exemplary embodiment, the switching drive 7 is located in the first position area. The switching driving member 7 is located on the proximal side of the second outer sleeve portion 501 , and the relative positions of the switching driving member 7 and the closing rod assembly 50 in the axial direction will not change. The first outer sleeve portion 71 of the switching driving member 7 is sheathed on the outside of the connecting rod 18 , and the connecting matching portion 76 of the switching driving member 7 and the third driving member 50 pass through the sliding groove 761 and the protrusion 503 The connection realizes the relative fixation in the axial direction. The protrusion 503 is located at the second section 7612 of the slide groove 761 (marked in FIG. 37 ), and the spring mounting portion 74 is located above the protrusion 503 . In the state shown in FIG. 34 , the operating part 73 drives the switching driving member 7 to move to the second position in the direction of the proximal side, and drives the closing rod assembly 50 to move in the direction of the proximal side, and the third driving part 502 drives the second The pivoting part 422 moves toward the proximal side, drives the link assembly 4 to enter the first state, and the second outer sleeve part 501 compresses the closing return spring 61 to generate elastic deformation, and simultaneously drives the closing pull piece 12 to move toward the proximal side, Close the nail head. At this time, the closed switching mechanism is in the state shown in FIG. 35 .

As shown in Fig. 36 and Fig. 37, in the fifth embodiment, the second drive part 46 is arranged on the second pivot part 422, and the second drive part 46 and the fourth pivot part 423 are respectively located on both sides of the third pin shaft 45 . Therefore, in this embodiment, the second driving part 46 is no longer integrated with the second pin shaft 44 . As shown in FIG. 36 , the second driving part 46 is located on the proximal side of the third pin shaft 45, the fourth pivot joint 423 is located on the distal side of the third pin shaft 45, and the first The two rods 42 form a lever structure that can rotate relative to the third pin shaft 45 . Therefore, when the connecting rod assembly 4 enters the second state from the first state, the fourth pivotal portion 423 moves toward the direction close to the connecting rod 18 , and the second pivotal portion 422 moves relative to the first The three-pin shaft 45 rotates clockwise, so that the second driving part 46 moves away from the connecting rod 18 . When the second driving part 46 moves towards the direction close to the connecting rod 18, the second pivot part 422 rotates counterclockwise relative to the third pin shaft 45, so that the fourth pivot part 423 Move in a direction away from the connecting rod 18 .

As shown in FIG. 36 and FIG. 37 , in the fifth embodiment, the switching driving member 7 includes two side walls, and the two side walls are respectively located on both sides of the third driving part 502 , and the first A driving portion 72 is a fourth pin connected between two side walls of the switching driving member 7 . A matching groove 425 is disposed on a side of the second driving portion 46 away from the connecting rod. When the connecting rod assembly 4 is in the first state, the second driving part 46 is located on the side of the first driving part 72 facing the connecting rod 18 , and the lower surface of the second driving part 46 There is a certain height gap between the upper surface of the first driving part 72 , so that the first driving part 72 will not act on the second driving part 46 . When the connecting rod assembly 4 is in the second state, the first driving part 72 at least partially enters the matching groove 425 to form a relatively stable matching with the second driving part 46 .

In the state of FIG. 35 , when it is necessary to open the staple head of the stapler, the operator lifts the operating portion 73 upwards, and drives the operating portion 73 to move upward in the seventh direction, and the first driving portion 72 moves the The second driving part 46 is lifted upwards, so that the second driving part 46 moves toward the direction close to the connecting rod 18 along the third direction, and the second pivot part 422 rotates counterclockwise around the third pin shaft 45 , The fourth pivotal part 423 and the third pivotal part 413 move in the direction away from the connecting rod 18 along the fourth direction, and the connecting rod assembly 4 enters the first state again, and the second pivotal part 422 The third driving part 502 is driven to move in the direction of the distal end, and the closing rod assembly 50 further drives the switching driving member 7 to also move in the direction of the distal end to the first position area. At the same time, the second jacket part 501 drives the closing pull tab 12 to move toward the distal side, so as to open the nail head. The closing return spring 61 also returns to the initial state, and the first biasing force of the closing return spring 61 further ensures that the closing pull rod assembly 50 can return to the initial position. At this time, the state of the closed switching mechanism is shown in FIG. 38 .

In the state of FIG. 38 , the chute 761 moves upwards relative to the protruding post 503 as a whole, and the protruding post 503 enters into the first section 7611 of the chute 761 (shown in FIG. 37 ). As the distance between the boss 503 and the spring mounting portion 74 increases, the switching return spring 62 is elongated and elastically deformed. At this time, the operator releases the operation part 73, and the operation part 73 loses the effect of external force. Under the action of the second biasing force of the switching return spring 62, the switching driving member 7 moves downwards and returns to the initial position (that is, the position and state of the switching driving member 7 shown in FIG. 34 ), the The protrusion 503 re-enters the second section 7612 of the slide groove 761 .

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims

A closed switching mechanism is characterized in that it is used for a medical stapler, the stapler includes a stapler body, and the closed switching mechanism includes:

The linkage assembly includes a first pivot portion and a second pivot portion, the first pivot portion is pivotally connected to the stapler body, and the linkage assembly includes a first state and a second state;

a switching drive member movable in a first direction and a second direction, the first direction being opposite to the second direction;

a closing pull rod assembly, the closing pull rod assembly is pivotally connected to the second pivot joint;

Wherein, when the switching driving member moves toward the first direction, it drives the closing rod assembly to move toward the first direction, so that the connecting rod assembly enters the second state from the first state;

And the switching driving member is configured to be operable to drive the linkage assembly from the second state into the first state, and the second pivot portion drives the closing pull rod assembly to the second direction sports.
The closed switching mechanism according to claim 1, wherein the link assembly comprises a first rod and a second rod, the second rod is located on the proximal side of the first rod, and the first rod including the first pivot portion and the third pivot portion, the second rod includes the second pivot portion and the fourth pivot portion, the third pivot portion is pivotally connected to the fourth hinge;

When the connecting rod assembly enters the second state from the first state, the third pivot portion and the fourth pivot portion move toward a third direction; the switching driving member moves toward the second When moving in one direction, the switching driving member drives the third pivotal part and the fourth pivotal part to move in a fourth direction, and the third direction is opposite to the fourth direction.
The closed switching mechanism according to claim 2, further comprising a connecting rod, the third direction is a direction toward the connecting rod, and the fourth direction is a direction away from the connecting rod;

The switching driving member includes a first driving part and a first sheath part, the first sheathing part is sheathed on the outside of the connecting rod or the outside of the closing rod assembly, and the first driving part is located on the first An outer sleeve portion faces one side of the connecting rod assembly, and when the first outer sleeve portion moves toward the first direction, it drives the closing rod assembly to move toward the first direction, so that the connecting rod assembly is moved by the The first state enters the second state.
The closing switching mechanism according to claim 3, wherein the first direction is toward the proximal side of the stapler, and the second direction is toward the distal side of the stapler, so Both the first direction and the second direction are along the axial direction of the stapler.
The closed switching mechanism according to claim 3, wherein when the connecting rod assembly is in the second state, and the switching driving member moves toward the second direction, the connecting rod assembly is driven to enter the The first state, and the second pivot portion drives the closing rod assembly to move in the second direction.
The closed switching mechanism according to claim 5, wherein a second driving part is provided on the first rod or the second rod, and when the connecting rod assembly is in the second state, the first The second driving part protrudes toward the direction of the connecting rod relative to the first rod or the second rod;

When the connecting rod assembly is in the second state and the switching driving member moves toward the second direction, the switching driving member presses the second driving part in a direction away from the connecting rod, so that the The connecting rod assembly enters the first state.
The closed switching mechanism according to claim 6, wherein the switching driving member moves toward the first direction, so that after the connecting rod assembly enters the second state from the first state, the The first driving part is located on the proximal side of the second driving part.
The closing switching mechanism according to claim 6, characterized in that, the distal side of the first driving part is provided with a first guide surface, and/or the proximal side of the second driving part is provided with a second guiding surface. boot surface.
The close switch mechanism according to claim 6, wherein the second driving part is arranged on the third pivot part or the fourth pivot part.
The closing switching mechanism according to claim 3, wherein the switching driving member includes two first driving parts, and the two first driving parts are arranged symmetrically with respect to the axial direction of the stapler; The link assembly is provided with two second driving parts, and the switching drive member is configured to be operable to drive the link assembly from the second state to the first state, each of the second A driving part respectively drives one of the second driving parts.
The closing switching mechanism according to claim 5, wherein the first driving part is a driving arm extending from the first outer casing part to the second direction.
The closing switching mechanism according to claim 5, wherein a switching biasing member is provided between the switching driving member and the stapler body, and the switching biasing member gives the switching driving member a direction toward the The first biasing force in the first direction.
The closed switching mechanism according to claim 12, wherein the switching biasing member is a switching return spring, one side of the first outer sleeve part is provided with a spring matching groove, and one end of the switching return spring is arranged on The spring fits in the groove.
The closing switching mechanism according to claim 4, wherein the closing pull rod assembly comprises a second outer casing part and a third driving part, the second outer casing part is sleeved on the outside of the connecting rod, and the The first outer sheath part of the switching driver is matched with the second outer sheath part, the first end of the third driving part is pivotally connected to the second pivot joint, and the second end of the third driving part is fixedly connected to the second outer sheath part. on the second jacket part.
The closing switching mechanism according to claim 14, wherein a closing biasing member is provided between the closing rod assembly and the stapler body, and the closing biasing member gives the closing rod assembly a direction toward the The second biasing force in the second direction.
The closing switching mechanism according to claim 15, wherein the closing rod assembly comprises a first closing member and a second closing member, the first closing member is sleeved on the outside of the connecting rod, and the first closing member The second closure part includes the second outer casing part and the driving part, the first closure part is axially fixed to the second outer casing part, and the first closure part protrudes far from the second outer casing part. The end-side part passes through the interior of the first jacket part of the shifting drive.
The closing switching mechanism according to claim 16, characterized in that, the closing biasing member is a closing return spring, the inside of the first closing member is provided with a spring mating step surface, and one end of the closing returning spring is connected to the closing return spring. Said spring cooperates with the stepped surface to hold against each other.
The closing switching mechanism according to claim 1, wherein the switching drive member includes an operating part, the operating part protrudes from the outer surface of the housing of the stapler body, and the housing is provided with a The internal storage tank.
The closing switching mechanism according to claim 1, further comprising a closing pull piece, the proximal side of the closing pull piece is connected with the closing pull rod assembly through a connecting pin.
The closing switching mechanism according to claim 3, wherein the switching driving member is pivotally connected to the closing pull rod assembly, the connecting rod assembly is in the second state, and the switching driving member is relatively When the closing rod assembly rotates in the fifth direction, the connecting rod assembly is driven to enter the first state, and the second pivot portion drives the closing rod assembly and the switching driving member to the second direction movement.
The closing switching mechanism according to claim 20, wherein the switching driving member comprises a first driving part and a rotating fitting part, and the rotating fitting part is pivotally connected to the closing pull rod assembly through a rotating shaft, so The connecting rod assembly includes a second driving part;

When the connecting rod assembly is in the second state and the switching driving member rotates in the fifth direction, the first driving part drives the second driving part in a direction away from the connecting rod, so that the The linkage assembly enters the first state.
The close switching mechanism according to claim 21, wherein the second driving part is arranged on the third pivot part or the fourth pivot part.
The closed switching mechanism according to claim 21, wherein when the connecting rod assembly is in the second state, the first driving part is located on the side of the second driving part facing the connecting rod, And there is a certain height gap between the opposite surfaces of the first driving part and the second driving part.
The closing switching mechanism according to claim 21, wherein the switching driving member further includes a first outer casing part, the closing rod assembly includes a second outer casing part and a third driving part, and the first outer casing part covers It is arranged on the outside of the second outer casing, the second outer casing is sleeved on the outside of the connecting rod, the third driving part is pivotally connected to the second pivot part of the connecting rod assembly, and the When the second sleeve part moves toward the first direction, the connecting rod assembly is driven to enter the second state from the first state.
The closing switching mechanism according to claim 24, wherein the first driving part is a driving arm extending from the rotating fitting part to the second direction, and the rotating fitting part is connected to the second A bending portion between an outer casing part and the first driving part, a fixed angle is set between the first driving part and the first outer casing part.
The closing switch mechanism according to claim 24, characterized in that, the rotating fitting part is pivotally connected to the third driving part of the closing pull rod assembly through the rotating shaft.
The closing switching mechanism according to claim 20, characterized in that, a switching biasing member is provided between the switching driving member and the closing rod assembly, and the switching driving member is positioned along the fifth axis relative to the closing rod assembly. When the direction is rotated, the switching biasing member is deformed to give the switching driving member a second biasing force to rotate in a sixth direction, the sixth direction is opposite to the fifth direction.
The closing switching mechanism according to claim 27, wherein the switching biasing member is a switching return spring, the closing rod assembly is provided with a first spring mounting part, and the switching driving part is provided with a second A spring installation part, the two ends of the switching return spring are respectively fixed on the first spring installation part and the second spring installation part, and when no external force is applied, the proximal end surface of the switching driving part is at least partly against the The closing rod assembly.
The closure switching mechanism according to claim 3, wherein the switching driving member is fixed relative to the closing rod assembly in the axial direction of the stapler, and the switching driving member can be fixed relative to the closing rod assembly. The pull rod assembly moves in a seventh direction, and a fixed angle is set between the seventh direction and the first direction or the second direction;

Wherein, when the switching driving member moves toward the first direction, it drives the closing pull rod assembly to move toward the first direction, so that the connecting rod assembly enters the second state from the first state; When the switching driving member moves in the seventh direction relative to the closing rod assembly, it drives the connecting rod assembly to enter the first state, and the second pivot part drives the closing rod assembly and the The switching driving member moves in the second direction.
The closing switching mechanism according to claim 29, wherein the included angle is a right angle, and the switching driving member can move in an up and down direction relative to the closing pull rod assembly.
The closing switching mechanism according to claim 29, wherein the switching driving member comprises a first driving part and a connecting fitting part, and the connecting fitting part is fixed in the axial direction relative to the closing rod assembly, and can move in the seventh direction relative to the closing rod assembly, and the connecting rod assembly includes a second driving part;

When the connecting rod assembly is in the second state, and the switching driving assembly moves in the seventh direction relative to the closing pull rod assembly, the first driving part drives the first driving part along the seventh direction. and a second driving part, so that the connecting rod assembly enters the first state.
The closed switching mechanism according to claim 31, wherein the seventh direction is a direction toward the connecting rod or a direction away from the connecting rod.
The closing switching mechanism according to claim 32, wherein the switching driving member further includes a first connecting part, the closing rod assembly includes a second outer casing part and a third driving part, and the first connecting part is movable Connected to the second outer sleeve portion, the second outer sleeve portion is sleeved on the outside of the connecting rod, and the third driving portion is pivotally connected to the second pivot portion of the connecting rod assembly.
The closing switching mechanism according to claim 33, wherein the first connecting part is a first outer casing part, and the first connecting part is sleeved on the second outer casing part.
The closing switching mechanism according to claim 31, wherein the connecting fitting part is provided with a chute extending along the seventh direction, and the closing pull rod assembly is provided with a boss, or, the closing pull rod assembly A chute extending along the seventh direction is provided, and a boss is provided on the connection fitting part;

The protrusion at least partially enters the interior of the chute, and can move along the extending direction of the chute.
The closing switching mechanism according to claim 29, wherein a switching biasing member is provided between the switching driving member and the closing rod assembly, and the switching biasing member gives the switching driving member a first edge Two biasing forces, the direction of the second biasing force is opposite to the seventh direction.
The closing switching mechanism according to claim 36, wherein the switching driving part is provided with a chute extending along the seventh direction, the closing rod assembly is provided with a boss, and the switching driving part is provided with The spring matching part, or, the closing pull rod assembly is provided with a chute extending along the seventh direction, and the switching drive member is provided with a boss;

The protruding post at least partly enters the interior of the chute, and can move along the extending direction of the chute, and the two ends of the switching biasing member are respectively arranged on the protruding post and the spring fitting part.
The close switching mechanism according to claim 32, wherein the second driving part is arranged on the third pivotal part and/or the fourth pivotal part.
The closing switching mechanism according to claim 38, wherein the third pivoting part and the fourth pivoting part are pivotally connected by a second pin shaft, and the second driving part and the second The pin shaft is integrally arranged, and the second driving part protrudes from the surfaces of the third pivot part and the fourth pivot part.
The closing switching mechanism according to claim 32, wherein the switching driving member further includes a first sleeve portion, the closing rod assembly includes a second sleeve portion, and the second sleeve portion is sleeved on the connection The outside of the rod, the first sheath part is sleeved on the outside of the second sheath part; the first driving part is located at the distal side of the connection fitting part.
The closed switching mechanism according to claim 32, wherein when the connecting rod assembly is in the second state, the first driving part is located on the side of the second driving part facing the connecting rod, And the side surface of the first driving part facing the second driving part is a plane parallel to the axial direction.
The closing switching mechanism according to claim 33, wherein the second pivoting part is rotatably connected to the closing pull rod assembly through a third pin shaft, and the second driving part is arranged on the second A pivotal joint, and the second drive part and the fourth pivotal joint are respectively located on two sides of the third pin.
The closed switching mechanism according to claim 42, wherein the switching driving member includes two side walls, and the two side walls are respectively located on both sides of the third driving part, and the first driving part It is the fourth pin shaft connected between the two side walls of the switching drive member.
The closed switching mechanism according to claim 42, wherein when the connecting rod assembly is in the first state, the second driving part is located on the side of the first driving part facing the connecting rod, And there is a height gap between the opposite surface of the second driving part and the first driving part;

A fitting groove is provided on a side of the second driving part away from the connecting rod, and when the connecting rod assembly is in the second state, the first driving part at least partially enters into the fitting groove.
A medical stapler, characterized by comprising the closing switching mechanism according to any one of claims 1-44.