CN217960198U

CN217960198U - Closing switching mechanism and medical anastomat

Info

Publication number: CN217960198U
Application number: CN202221849376.6U
Authority: CN
Inventors: 丁水澄
Original assignee: Suzhou Tianchen International Medical Technology Co Ltd
Current assignee: Suzhou Tianchen International Medical Technology Co Ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-12-06
Anticipated expiration: 2032-07-18

Abstract

The utility model provides a closed switching mechanism and medical anastomat, closed switching mechanism includes: an actuating lever including a switching drive; the connecting rod assembly comprises a first rod and a second rod which are connected through a pivot, a mounting groove is formed in the pivot connecting part of the connecting rod assembly, and the connecting rod assembly comprises a first state and a second state; a closure tab assembly pivotally connected to the second rod; the reset piece at least partially enters the mounting groove, and the reset piece pivot is arranged on the pivot connecting part; when the linkage assembly is in the second state and the actuating lever moves towards the proximal side, the switching drive member presses the reset member towards the direction away from the actuating lever, so that the pivot part moves towards the direction away from the actuating lever, the linkage assembly enters the first state, and the second lever drives the closing pull tab assembly to move towards the distal side. The utility model discloses a switching driving piece and the cooperation that resets can open pin fin portion automatically.

Description

Closing switching mechanism and medical anastomat

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to closed switching mechanism and medical anastomat.

Background

The medical anastomat comprises a medical anastomat body, a firing handle movably connected with the medical anastomat body and a nail head matched with the medical anastomat body. The nail head comprises a nail bin assembly and a nail anvil which are oppositely arranged. During operation, the trigger handle is firstly held, the closing pull piece is pulled to move towards the near end side of the anastomat through the closing switching mechanism, so that after the nail bin assembly and the nail anvil are closed, the trigger handle is held again, anastomotic nails can be pushed to move towards tissues, the tissues are anastomosed through forming of the anastomotic nails in the nail bin assembly at the nail anvil, and meanwhile, the cutter moves towards the far end side to cut the tissues. In the present invention, the distal side and the proximal side are relative to the operator, and the end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical site is the distal side.

In the existing closed switching mechanism, the structure is complex. And after the anastomat is fired, the nail head cannot be automatically opened, an operator needs to manually open the nail head, and the operation is very inconvenient.

SUMMERY OF THE UTILITY MODEL

To the problem among the prior art, the utility model aims to provide a closed switching mechanism and medical anastomat, closed pulling-on piece subassembly can close the pin fin portion of anastomat when moving to near-end side direction to the pin fin portion of anastomat is closed the back, when to near-end side pulling actuating lever, opens the pin fin portion automatically.

The embodiment of the utility model provides a closed switching mechanism for medical anastomat, closed switching mechanism includes:

an actuating lever including a switching drive;

the connecting rod assembly comprises a first rod and a second rod which are connected in a pivot mode, the connecting rod assembly comprises a first state and a second state, and a mounting groove is formed in the pivot connection portion of the first rod and the second rod;

a closure tab assembly pivotally connected to the second rod;

the reset piece at least partially enters the mounting groove, and the reset piece pivot is arranged on the pivot connecting part;

when the connecting rod assembly is in the second state, and the actuating rod moves towards the direction of the proximal end side, the switching driving piece presses the resetting piece towards the direction far away from the actuating rod, so that the pivot connecting part moves towards the direction far away from the actuating rod, the connecting rod assembly enters the first state, and the second rod drives the closing pull-tab assembly to move towards the direction of the distal end side of the anastomat.

In some embodiments, the reset element includes an abutting portion and a pivot portion, the pivot portion is at least partially located in the mounting groove, the reset element includes a third state and a fourth state, and when the reset element is in the third state, the abutting portion at least partially protrudes from a side surface of the first rod and/or the second rod facing the actuating rod;

the switching driving piece is at least one groove part arranged on one side of the actuating rod facing the connecting rod assembly;

the link assembly is in the second state, the reset member is in the third state, and when the actuating lever moves towards the direction of the proximal end side, the switching driving member presses the abutting portion towards the direction away from the actuating lever.

In some embodiments, the first rod and/or the second rod is provided with a stop portion, the stop portion is at least partially located on a proximal end side of the abutting portion, and the stop portion is blocked from rotating in a proximal end side direction in the third state.

In some embodiments, the link assembly is in the second state and the reset member is in the third state, the reset member is at least partially disposed within one of the recessed portions; when the side wall of the groove part moves towards the direction of the far end side, the actuating rod presses the abutting part to rotate towards the direction of the far end side so as to further enter the mounting groove, and the resetting piece enters the fourth state.

In some embodiments, the recessed portion is provided with a first face at the proximal end and a second face at the distal end; the reset piece is provided with a driving surface positioned at the far end of the abutting part; when the connecting rod assembly is in the second state and the reset piece is in the third state, an included angle between the near end face of the abutting portion and the first face is an acute angle.

In some embodiments, the mounting groove forms a relief space at a distal side of the holding portion.

In some embodiments, the device further comprises an elastic member, wherein the elastic member biases the abutting part to a proximal side direction.

In some embodiments, the elastic member is a spring piece integrally formed with the reset member, a first end of the spring piece is connected to the pivot portion of the reset member, and a second end of the spring piece is fixed inside the mounting groove.

In some embodiments, the elastic member includes at least one of a torsion spring, a tension spring, and a compression spring.

In some embodiments, one of the first and second bars is provided with the mounting slot at the pivot connection, and the other is provided with a boss at the pivot connection, the boss at least partially entering the mounting slot and being rotatable relative to the mounting slot.

In some embodiments, the hinge assembly further comprises a pin shaft, wherein the pin shaft simultaneously penetrates through the side wall of the mounting groove, the protruding portion and the pivot portion.

In some embodiments, the protrusion and the pivot portion of the reset member are arranged on the pin in a transverse direction, and the pivot portion is clamped between the protrusion and the inner wall of the mounting groove in the transverse direction.

In some embodiments, the pivot portion is simultaneously inserted through the side wall of the mounting groove and the protrusion portion.

In some embodiments, the lateral width of the retaining portion is greater than the lateral width of the pivot portion.

In some embodiments, the surface of the protrusion forms a yielding portion for yielding to the rotation movement of the holding portion in the direction of the far end side.

In some embodiments, the mechanism includes two reset pieces, and the two reset pieces are respectively disposed on two sides of the protruding portion and are arranged in an axisymmetric manner; or the like, or, alternatively,

the mechanism comprises two protruding parts, the reset piece is located between the two protruding parts, and the two protruding parts are arranged in an axial symmetry mode.

In some embodiments, the actuating lever comprises a rack and the switching drive comprises a drive tooth provided on a side of the rack facing the linkage assembly.

The embodiment of the utility model provides a still provide a medical anastomat, including foretell closed switching mechanism.

The utility model provides a closed switching mechanism and medical anastomat have following advantage:

through adopting the utility model discloses, when the closed pulling-on piece subassembly of link assembly drive moved to near-end side direction, the pin fin portion of closed anastomat, link assembly can maintain a relatively stable second state, keeps closed stability. After the anastomat is fired, when the drive actuating lever moved to the side direction of near-end, the switching driving piece oppressed the piece that resets to the direction of keeping away from the actuating lever for the mounting groove of link assembly and bellying move to the direction of keeping away from the actuating lever, and enter into first state, and link assembly drive closure pulling-on piece subassembly moved to the side direction of distal end this moment, thereby opened nail head, simple structure, convenient to use automatically.

Drawings

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

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

fig. 2 is a schematic structural view of the closed switching mechanism when the nail head of the embodiment of the present invention is opened;

fig. 3 is a schematic view of the linkage assembly engaging the rack when the stud is open according to an embodiment of the present invention;

FIG. 4 is a perspective view of a connecting rod assembly in accordance with an embodiment of the present invention;

fig. 5 is a top view of a link assembly and a reset member in accordance with an embodiment of the present invention;

FIG. 6 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 5;

fig. 7 is a schematic structural diagram of a restoring member according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of the closed switching mechanism when the nail head of the embodiment of the present invention is closed;

fig. 9 is a schematic view of the linkage assembly engaging the rack with the head closed according to an embodiment of the present invention;

fig. 10 is a cross-sectional view of the linkage assembly in a second state and the reset member in a third state in accordance with an embodiment of the present invention;

fig. 11 is a schematic structural view of a connecting rod assembly in a second state according to an embodiment of the present invention;

fig. 12 is a cross-sectional view of the linkage assembly in a second state and the reset member in a fourth state in accordance with an embodiment of the present invention;

fig. 13 is a top view of a link assembly and a reset member in accordance with another embodiment of the present invention.

Reference numerals:

1. anastomat body 423 stopping part

11. Fixed handle 424 abdication part

13. First pin of housing 43

15. Second pin of handle return spring 44

18. Third pin shaft of connecting rod 45

2. Rack 46 reset piece

21. Drive tooth 461 abutment

22. Groove 462 pivot portion

3. Firing handle 47 spring

31. Jack catch 471 spring terminal

32. First fitting part 51 closing pull rod

41. First lever 52 closes the return spring

411. Second mating portion 53 closure tab

412. First pin joint part 6 backspacing pull rod

413. The second pivot part 9 nails head

414. Mounting groove 91 nail anvil

4141. Spring plate fixing part 911 first matching groove

4142. Yield space 92 nail bin assembly

42. Second rod 921 second mating groove

421. Third pivot portion 93 closing pin

422. The fourth pivot joint part

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different 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 in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. In the specification, "or" may mean "and" or ". Although the terms "upper", "lower", "between", and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples described in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures to fall within the scope of the invention. Although the description may refer to certain features as "first" or "second," etc., this is done for convenience only and is not intended to limit the number or importance of particular features.

The utility model provides a medical anastomat that is used for medical anastomat's closed switching mechanism and includes it. The closure switching mechanism includes: an actuating lever including a switching drive; the connecting rod assembly comprises a first rod and a second rod which are connected through a pivot, the connecting rod assembly comprises a first state and a second state, and a mounting groove is formed in the pivot connecting part of the first rod and the second rod; a closure tab assembly pivotally connected to the second rod; the reset piece at least partially enters the mounting groove, and the reset piece pivot is arranged on the pivot connecting part; when the connecting rod assembly is in the second state, and the actuating rod moves towards the direction of the proximal end side, the switching driving piece presses the resetting piece towards the direction far away from the actuating rod, so that the pivot connecting part moves towards the direction far away from the actuating rod, the connecting rod assembly enters the first state, and the second rod drives the closing pull-tab assembly to move towards the direction of the distal end side of the anastomat.

In an initial state, the linkage assembly is in a first state, the pivot connection is located at a first position away from the actuation lever, and when the linkage assembly is driven from the first state to a second state, the pivot connection moves in a direction towards the actuation lever, such that the second lever drives the closure tab assembly in a proximal direction to close the head of the stapler. The linkage assembly may be maintained in a relatively stable second state, maintaining closure stability.

After the stapler is fired, the linkage assembly is in the second state. At this moment, when the actuating rod is driven to move towards the direction of the proximal end side, the switching driving piece presses the resetting piece towards the direction far away from the actuating rod, so that the pivot connecting part moves towards the direction far away from the actuating rod, the connecting rod assembly enters the first state, and the second rod drives the closing pull-tab assembly to move towards the direction of the distal end side of the anastomat, so that the nail head is automatically opened, the structure is simple, and the use is convenient.

The structure of the closed switching mechanism according to various embodiments of the present invention is described in detail below with reference to the accompanying drawings, and it should be understood that the scope of the present invention is not limited by the embodiments.

Fig. 1 to 12 are schematic structural views of a closing and switching mechanism and a stapler according to a first embodiment of the present invention. The stapler includes a staple head 9, a stapler body 1, a firing handle 3 rotatably connected to the stapler body 1, and the closure switching mechanism. The stapler body 1 comprises a housing 13, a connecting rod 18 and a fixing handle 11. The nail head 9 is provided on the distal end side of the connecting rod 18 of the stapler body 1. The anastomat body 1 is also provided with a handle return spring 15 connected to the firing handle 3, the firing handle 3 can be held by an operator to rotate anticlockwise in the drawing of figure 1 to be close to the fixed handle 11, the handle return spring 15 is driven to deform, and after the firing handle 3 is loosened, the firing handle returns to the initial position by rotating towards the direction far away from the fixed handle 11 under the action of the handle return spring 15. As shown in FIG. 1, said nail head 9 comprises an anvil 91 and a nail cartridge assembly 92 which are oppositely arranged, said anvil 91 has an open state which is opened relative to said nail cartridge assembly 92 and a closed state which is closed relative to said nail cartridge assembly 92. The proximal end side of the nail anvil 91 is provided with an inclined first matching groove 911, the proximal end side of the nail cartridge component 92 is provided with an axially extending second matching groove 921, and a closing pin 93 simultaneously penetrates through the first matching groove 911 and the second matching groove 921. The closing and switching mechanism comprises a closing pull tab 53 for closing the nail head 9, and the closing pull tab 53 is arranged inside the connecting rod 18 in a penetrating way. The distal side of the closure tab 53 is connected to the closure pin 93. In the initial state, the closing pin 93 is located at the distal end side of the second engagement groove 921, and the anvil 91 is in the open state. When the closing pull tab 53 pulls the closing pin 93 to move from the distal side to the proximal side of the second matching slot 921, the anvil 91 enters the closed state, and the anvil 91 and the cartridge assembly 92 clamp the tissue. The process of bringing the anvil 91 from the open condition into the closed condition is referred to as the closing process of the head 9, i.e. the closing process of the stapler. During the firing of the stapler, it is necessary to keep the staple head 9 closed. After the stapler firing is completed, the staple head 9 may be opened when the closure pin 93 and the closure tab 53 are moved in the distal direction.

In the present invention, the distal end side and the proximal end side are, with respect to the operator, the end closer to the operator is the proximal end side, the end farther from the operator, that is, the end closer to the surgical site is the distal end side, and the direction along the axial center of the stapler is the axial direction, that is, the direction from the distal end side to the proximal end side of the stapler, or the direction from the proximal end side to the distal end side of the stapler. For example, in the perspective of fig. 1, the distal side is the left side and the proximal side is the right side for the stapler. The direction S1 in fig. 1 is the direction from the distal side to the proximal side of the stapler. The direction S1 or the direction opposite to the direction S1 is defined as the axial direction of the anastomat. The S2 direction in fig. 2 is defined as a longitudinal direction, i.e., a height direction. The S3 direction in fig. 13 is defined as a lateral direction, i.e., a width direction.

As shown in fig. 2-4, the closure switching mechanism further includes an actuating lever, a linkage assembly, a closure pull rod 51, and a reset member 46. The actuating lever includes a switch drive. In this embodiment, the actuating lever is a toothed rack 2 and the switching drive is a grooved portion 22 arranged between drive teeth 21 of the toothed rack 2 on the side facing the connecting-rod assembly. The closure pull tab 51 and the closure pull tab 53 form in combination a closure pull tab assembly, the closure pull tab 51 being fixedly connected to a proximal side of the closure pull tab 53, the proximal side of the closure pull tab 51 being provided with a closure return spring 52, for example a compression spring, although the invention is not limited thereto. The linkage assembly includes a first rod 41, a second rod 42, a first pin 43, a second pin 44, and a third pin 45. The first rod 41 comprises a first pivot part 412 and a second pivot part 413, the second rod 42 comprises a third pivot part 421 and a fourth pivot part 422, and the second rod 42 is located at the proximal end side of the first rod 41. The first pivot portion 412 of the first rod 41 is rotatably mounted on the housing 13 of the stapler by a first pin 43, so that the first pivot portion 412 of the first rod 41 does not move axially relative to the housing 13 of the stapler. The second pivot portion 413 of the first lever 41 and the third pivot portion 421 of the second lever 42 are rotatably connected by a second pin 44. The fourth pivot portion 422 of the second rod 42 is rotatably connected to the closing pull rod 51 through a third pin 45, such that the fourth pivot portion 422 of the second rod 42 and the closing pull rod 51 are fixed in the axial direction, and when the fourth pivot portion 422 of the second rod 42 moves along the axial direction of the stapler, the closing pull rod 51 is driven to drive the closing pull piece 53 to move along the axial direction.

As shown in FIG. 2, the firing handle 3 includes a pawl 31 and a first mating portion 32, and the first lever 41 includes a second mating portion 411. The link assembly includes a first state in which the second pivot portion 413 and the third pivot portion 421 of the link assembly are at a first position away from the rack 2 (as shown in fig. 3), and a second state in which the second pivot portion 413 and the third pivot portion 421 of the link assembly are at a second position close to the rack 2 (as shown in fig. 9). When the linkage assembly is in the first state and the firing handle 3 is held, the firing handle 3 rotates counterclockwise in fig. 2, and the first engaging portion 32 drives the second engaging portion 411 to move toward the rack 2, so that the linkage assembly enters the second state.

As shown in fig. 3 to 6, in this embodiment, the second pivot portion 413 is provided with a mounting groove 414, the third pivot portion 421 is formed as a protruding portion, the third pivot portion 421 at least partially enters the mounting groove 414, the second pin 44 simultaneously penetrates through the third pivot portion 421 and the side wall of the mounting groove 414, so that the first rod 41 and the second rod 42 can rotate around the second pin 44, and the second pivot portion 413 and the third pivot portion 421 together form a pivot connection portion of the first rod 41 and the second rod 42. The reset element 46 includes a holding portion 461 and a pivot portion 462, the pivot portion 462 at least partially enters the mounting groove 414, the pivot portion 462 is sleeved on the second pin 44 and can rotate around the second pin 44, and therefore, the reset element 46 is coaxially disposed with the second pivot portion 413 and the third pivot portion 421. As shown in fig. 5, in this embodiment, the third pivoting portion 421 and the pivoting portion 462 of the resetting member 46 are transversely arranged on the pin shaft, and the pivoting portion 462 is transversely clamped between the third pivoting portion 421 and the inner wall of the mounting groove 414, so as to prevent the resetting member 46 from moving transversely.

The reset element 46 includes a third state and a fourth state, when the reset element 46 is in the third state, the abutting portion 461 at least partially protrudes from a side surface of the second pivot portion 413 facing the rack 2 (as shown in fig. 10), when the abutting portion 461 moves to a distal side direction and further enters into the inside of the mounting groove 414, the reset element 46 enters the fourth state, the abutting portion 461 completely enters into the mounting groove 414, or although the abutting portion 461 does not completely enter into the mounting groove 414, a height of a portion of the abutting portion 461 protruding from the second pivot portion 413 is smaller than a height of a portion of the abutting portion 461 protruding from the second pivot portion 413 in the third state (as shown in fig. 6 and 12).

The operation of the closed switching mechanism will be described in detail with reference to fig. 2 to 12.

As shown in fig. 2 to 6, in the initial state, the firing handle 3 is not held and is located at the initial position, and the handle return spring 15 is not deformed. The first rod 41 and the second rod 42 are in a first state of relative stability, and the second pivot portion 413 and the third pivot portion 421 are in a first position away from the actuating rod. The head is now open. The closing and switching mechanism further includes an elastic member, which biases the supporting portion 461 in a proximal direction. Specifically, as shown in fig. 6 and 7, the elastic member is a spring piece 47 integrally formed with the reset member 46, a first end of the spring piece 47 is connected to the pivot part 462 of the reset member 46, and a second end 471 of the spring piece 47 is fixed in the spring piece fixing part 4141 in the mounting groove 414. The third pivot 421 further has a stop portion 423, and the stop portion 423 is at least partially located on the proximal side of the abutting portion 461. In an initial state, under the stopping action of the stopping portion 423, the abutting portion 461 rotates towards the distal direction and at least partially enters the mounting groove 414, and the restoring member 46 is in a fourth state and presses the elastic sheet 47 to elastically deform. In other alternative embodiments, the elastic element may also be a torsion spring sleeved on the second pin 44, or a tension spring, a compression spring, or the like disposed between the restoring element 46 and the inner wall of the mounting groove 414.

When the nail head needs to be closed, the operator grips the firing handle 3, rotates the firing handle 3 counterclockwise, drives the compression return spring 15 to deform, and drives the second engagement portion 411 in a direction in which the first engagement portion 32 approaches the rack 2, as shown in fig. 8. In the view shown in fig. 8, the first engaging portion 32 drives the second engaging portion 411 upward, so that the second engaging portion 411 moves upward, and further drives the second pivoting portion 413 and the third pivoting portion 421 to move upward to reach the second position close to the rack 2, and at this time, the link assembly enters a relatively stable second state. In the process that the connecting rod assembly enters the second state from the first state, the fourth pivot portion 422 of the second rod 42 drives the closing pull rod 51 to move towards the proximal side direction, and further drives the closing pull tab 53 to move towards the proximal side direction, so that the nail head is closed, and at the moment, the closing pull rod 51 compresses the closing return spring 52 to deform. At this time, since the link assembly can be maintained in a relatively stable second state, the stability of the closing of the nail head is maintained.

As shown in fig. 9 to 11, after the connecting rod assembly enters the second state, the stopping portion 423 no longer presses the abutting portion 461, and under the elastic restoring force of the elastic piece 47, the abutting portion 461 moves towards the proximal side and protrudes out of the surface of the second pivot portion 413, so that the resetting member 46 enters the third state, the abutting portion 461 is matched with the groove portion 22 of the rack 2, and the abutting portion 461 at least partially enters the groove portion 22.

As shown in fig. 10, in this embodiment, the mounting groove 414 forms a relief space 4142 on the distal end side of the abutting portion 461. In the state of fig. 8 to 11, if the firing handle 3 is held again, the claw 31 of the firing handle 3 is engaged with the driving tooth 21 to drive the rack 2 to move in the distal direction, and the rack 2 moves in the distal direction to drive the distal push-knife rod to fire the anastomat. When the link assembly is in the second state, the reset member 46 is in the third state, and the actuating rod moves towards the distal direction, the actuating rod presses the abutting portion 461 to rotate towards the distal direction and further enter the mounting groove 414, so that the reset member 46 enters the fourth state, thereby not blocking the movement of the rack 2 towards the distal direction, so that the stapler can be normally fired, at this time, the elastic piece 47 is pressed to generate elastic deformation, and at this time, the link assembly and the reset member 46 are in the state shown in fig. 12. At this time, since the reset piece 46 does not block the movement of the rack 2 towards the distal side direction, the rack 2 does not provide a downward driving force to the reset piece 46, and the first rod 41 and the second rod 42 do not rotate, so that the linkage assembly can be maintained in the stable second state, and the stability of closing the nail head during the stapler firing process can be ensured.

As shown in fig. 10, the recessed portion 22 includes a first surface at the proximal end and a second surface at the distal end, and the reset member 46 includes a driving surface at the distal end of the abutting portion 461. When the link assembly is in the second state and the reset member 46 is in the third state, the proximal end surface of the abutting portion 461 is an inclined guide surface, an included angle between the guide surface and the first surface of the groove portion 22 is an acute angle, and the second surface is attached to the driving surface. Since the proximal end surface of the abutting portion 461 is a guiding surface, during the percussion process of the stapler, the groove portion 22 can press down the abutting portion 461 in the distal direction to further enter the mounting groove 414, thereby making room for the movement of the driving tooth 21 in the distal direction.

After the stapler is fired, the reset element 46 is no longer acted by the groove portion 22, the abutting portion 461 rotates towards the proximal direction under the action of the elastic deformation restoring force of the elastic sheet 47, the reset element 46 enters the third state shown in fig. 9 and 10 from the fourth state shown in fig. 12, and the abutting portion 461 protrudes from the upper surface of the second pivot portion 413. At this time, the rack 2 can be driven to move in the proximal direction by pulling the retraction lever 6 in the proximal direction. During the movement of the rack 2 in the proximal direction, the groove portion 22 comes into contact with the driving surface of the abutting portion 461 and applies a force. The abutting portion 461 is blocked by the blocking portion 423 and cannot rotate continuously in the proximal direction, therefore, the force applied to the abutting portion 461 by the groove portion 22 is converted into an acting force in a direction away from the rack 2, the abutting portion 461 is pressed by the groove portion 22 to move in the direction away from the rack 2, that is, in the view angles of fig. 9 and 10, the abutting portion 461 is pressed by the groove portion 22 to move downward, the second pivoting portion 413 and the third pivoting portion 421 are driven to move downward to the farther first position, and the connecting rod assembly returns to the first state shown in fig. 3 again. In the process that the connecting rod assembly enters the first state from the second state, the fourth pivoting portion 422 of the second rod 42 moves towards the far-end side, so as to drive the closing pull rod 51 to move towards the far-end side, and further drive the closing pull tab 53 to move towards the far-end side, so that the nail head is automatically opened, and the elastic restoring force of the closing return spring 52 can further drive the nail head to be opened more smoothly.

As shown in fig. 7 and 11, in this embodiment, the lateral width of the abutting portion 461 is larger than that of the pivot portion 462 so as to increase the fitting area of the abutting portion 461 and the groove portion 22. When the rack 2 drives the abutting portion 461 in the distal direction, the abutting portion 461 can more easily enter the mounting groove 414 to give way to the rack 2 through a larger matching area, and the connecting rod assembly is prevented from rotating in the process of firing the stapler. When the rack 2 moves toward the proximal side, the rack 2 can more easily drive the abutting portion 461 to move downward to drive the connecting rod assembly to return to the first state due to the larger matching area. As shown in fig. 11, in order to better yield the supporting portion 461, a yielding portion 424 for yielding the supporting portion 461 by rotating in a distal direction is formed on the surface of the third pivot portion 421, and the yielding portion 424 is located at the distal side of the stopping portion 423.

Fig. 13 is a schematic structural diagram of a closed switching mechanism according to another embodiment of the present invention. This embodiment differs from the embodiment shown in fig. 1 to 12 in that: in this embodiment, the two reset pieces 46 are included, and the two reset pieces 46 are respectively disposed on two sides of the third pivot portion 421 and are axisymmetrically disposed. The pivot portions 462 of the two restoring elements 46 are sleeved outside the second pin shaft 44. Correspondingly, the third pivot 421 may have a stopping portion 423, and is matched with the two restoring members 46 at the same time, or may have two stopping portions 423, which are respectively matched with the two restoring members 46.

In other alternative embodiments, the engagement between the return member and the linkage assembly may take other forms. For example, a reset member is provided, the third pivot portion is provided with two protruding portions, the two protruding portions are respectively located on two lateral sides of the reset member, that is, the reset member is located between the two protruding portions, and the two protruding portions are arranged in an axisymmetric manner. Alternatively, a groove may be provided in the reset member, the protrusion entering at least the groove of the reset member, or a groove may be provided in the protrusion, and the reset member entering at least partially the groove of the protrusion.

The above embodiments have been described by taking the mounting groove disposed on the second pivot portion of the first rod as an example. In another embodiment, the third pivoting portion of the second rod is provided with a mounting groove, the second pivoting portion of the first rod is formed as a protruding portion, the protruding portion at least partially enters the mounting groove, and the matching manner of the protruding portion and the restoring member may be any one of the aforementioned matching manners. The stopping portion may be disposed on the first rod or at another position of the second rod, as long as the stopping portion in the third state can be stopped from moving further to the proximal direction.

In the above embodiment, the pivot connection portion includes the second pivot portion and the third pivot portion, one of the second pivot portion and the third pivot portion is provided with a mounting groove, and the other forms the protrusion portion to enter the mounting groove, and the mounting groove and the pivot portion of the reset piece of the protrusion portion are coaxially connected by the second pin. In another embodiment, the second pin shaft may not be provided, one side of the protruding portion and the inner wall of one side of the mounting groove form a concave-convex fit, one side of the reset member and the inner wall of the other side of the mounting groove form a concave-convex fit, and a stable rotatable connection between the mounting groove, the protruding portion and the reset member may also be realized. In still another embodiment, the pivot portion of the reset member may be configured in a long shaft shape without providing the second pin, so that the pivot portion simultaneously passes through the side wall of the mounting groove and the protrusion portion to function as a pin. In still another embodiment, the second pin may not be provided, and the protrusion may be formed in a long shaft shape such that the protrusion simultaneously penetrates the side wall of the mounting groove and the pivot portion of the reset member to function as a pin.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A closure switching mechanism for a medical stapler, the closure switching mechanism comprising:

an actuating lever including a switching drive;

the connecting rod assembly comprises a first rod and a second rod which are connected through a pivot, the connecting rod assembly comprises a first state and a second state, and a mounting groove is formed in the pivot connecting part of the first rod and the second rod;

a closure tab assembly pivotally connected to the second rod;

2. The closure switching mechanism of claim 1, wherein the reset member comprises an abutting portion and a pivot portion, the pivot portion is at least partially located in the mounting groove, the reset member comprises a third state and a fourth state, and when the reset member is in the third state, the abutting portion at least partially protrudes from a side surface of the first lever and/or the second lever facing the actuating lever;

the switching driving piece is at least one groove part which is arranged on one side of the actuating rod facing the connecting rod assembly;

3. The closure switching mechanism of claim 2, wherein the first rod and/or the second rod is provided with a stopper, and the stopper is at least partially located at a proximal end side of the abutting portion to block rotation of the stopper in a proximal end side direction in the third state.

4. The closure switching mechanism of claim 2, wherein said link assembly is in said second state and said reset member is in said third state, wherein said reset member is at least partially disposed within one of said recessed pockets; when the actuating lever moves towards the direction of the far end side, the groove part presses the abutting part to rotate towards the direction of the far end side so as to further enter the mounting groove, and the resetting piece enters the fourth state.

5. The closure switching mechanism of claim 4, wherein the recessed portion is provided with a first face at the proximal end and a second face at the distal end; the reset piece is provided with a driving surface positioned at the far end of the abutting part;

when the connecting rod assembly is in the second state and the reset piece is in the third state, an included angle between the near end face of the abutting portion and the first face is an acute angle.

6. The closure switching mechanism of claim 4, wherein the mounting slot forms a relief space on a distal side of the retaining portion.

7. The closure switching mechanism of claim 4, further comprising a resilient member that biases the retaining portion in a proximal direction.

8. The closure switching mechanism of claim 7, wherein the resilient member is a resilient tab integrally formed with the reset member, a first end of the resilient tab is connected to the pivot portion of the reset member, and a second end of the resilient tab is fixed within the mounting slot.

9. The closure switching mechanism of claim 7, wherein the resilient member comprises at least one of a torsion spring, a tension spring, and a compression spring.

10. The closure switching mechanism of claim 2, wherein one of the first and second bars is provided with the mounting slot at the pivot connection, and the other is provided with a boss at the pivot connection, the boss at least partially entering the mounting slot and being rotatable relative to the mounting slot.

11. The closure switching mechanism of claim 10, further comprising a pin shaft, wherein the pin shaft is simultaneously inserted through the side wall of the mounting groove, the protrusion and the pivot portion.

12. The closure switching mechanism of claim 11, wherein said protrusion and said pivot portion of said reset member are laterally aligned on said pin, and said pivot portion is laterally sandwiched between said protrusion and an inner wall of said mounting slot.

13. The closure switching mechanism of claim 10, wherein the pivot portion is simultaneously inserted through the side wall of the mounting groove and the protrusion portion, or wherein the protrusion portion is simultaneously inserted through the side wall of the mounting groove and the pivot portion of the reset member.

14. The closure switching mechanism of claim 10, wherein a lateral width of the retaining portion is greater than a lateral width of the pivot portion.

15. The closure switching mechanism of claim 14, wherein the surface of the protrusion forms a relief portion for relieving the holding portion from rotational movement in a distal direction.

16. The closure switching mechanism of claim 10, wherein the mechanism comprises two of the reset members, the two reset members are respectively disposed on two sides of the protruding portion and are arranged in an axisymmetric manner; or the like, or, alternatively,

17. The closure switching mechanism of claim 1, wherein the actuation lever comprises a rack and the switching drive comprises a drive tooth disposed on a side of the rack facing the linkage assembly.

18. A medical stapler, characterized in that it comprises a closure switching mechanism according to any one of claims 1 to 17.