CN218684551U

CN218684551U - Closing driving mechanism and medical anastomat

Info

Publication number: CN218684551U
Application number: CN202221850230.3U
Authority: CN
Inventors: 史晓杰
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: 2023-03-24
Anticipated expiration: 2032-07-18

Abstract

The utility model provides a closed actuating mechanism and medical anastomat, closed actuating mechanism includes: the closure tab assembly comprises a closure tab assembly and a linkage assembly, the linkage assembly is connected to the closure tab assembly, and the linkage assembly comprises a first state and a second state; the actuating rod, one side towards link assembly of actuating rod offers the backstop slot; the trigger handle is provided with a stop piece; when the connecting rod assembly is in a first state and the firing handle rotates for a first angle along a first direction, the firing handle drives the connecting rod assembly to enter a second state, the connecting rod assembly drives the closing pull-tab assembly to move for a first distance towards the direction of the near end side, the stop piece at least partially enters the stop groove along with the rotation of the firing handle, the stop groove stops the rotation of the firing handle along a second direction through the stop piece, and the second direction is opposite to the first direction. The utility model discloses can keep closed pulling-on piece subassembly in the position that needs to keep the partly closed state of pin fin portion.

Description

Closing driving mechanism and medical anastomat

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to closed actuating 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 by the closing driving mechanism to move towards the near-end side of the anastomat, so that after the nail bin assembly and the nail anvil are closed, the trigger handle is held again, the anastomotic nails can be pushed to move towards tissues, the tissues are anastomosed through the formation 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. The utility model discloses in, distal end side and near-end side are for the operator, and the one end that is nearer apart from the operator is near-end side, and the one end far away apart from the operator, the one end that is more close to the operation position promptly is the distal end side.

In practice, it is sometimes necessary to partially close the head of the nail, to reduce the diameter of the head of the nail appropriately so that it can enter the surgical channel smoothly, and then to open the head of the nail to continue the subsequent complete closing and firing operation. The closing driving mechanism in the prior art can only switch the nail head of the anastomat between a fully opened state and a fully closed state, and cannot keep the nail head in a partially closed state between the opened state and the closed state.

SUMMERY OF THE UTILITY MODEL

To solve the problems in the prior art, an object of the present invention is to provide a closure driving mechanism and a medical stapler, which can keep a closure pull-tab assembly at a desired position to keep a partially closed state of a nail head.

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

a closure tab assembly and a linkage assembly connected to the closure tab assembly, the linkage assembly including a first state and a second state;

the actuating rod is provided with a stop groove on one side facing the connecting rod assembly;

a firing handle having a stop disposed thereon;

when the connecting rod assembly is in the first state and the firing handle rotates for a first angle along a first direction, the firing handle drives the connecting rod assembly to enter the second state, the connecting rod assembly drives the closing pull-tab assembly to move for a first distance towards a proximal side direction, the stop piece at least partially enters the stop groove along with the rotation of the firing handle, the stop groove stops the rotation of the firing handle along a second direction by stopping the stop piece, and the second direction is opposite to the first direction.

In some embodiments, the linkage assembly includes a biasing member configured to cause the linkage assembly to have a tendency to move distally, and the stop abuts against a proximal face of the stop slot when the linkage assembly is in the second state.

In some embodiments, the stopper comprises a stopper, and the stopper protrudes from an end of the firing handle facing the actuating rod, and the stopper at least partially enters the stopper groove when the firing handle rotates in the first direction by a first angle.

In some embodiments, a first receiving groove extending in the third direction is provided in the firing handle, the stopper at least partially enters the first receiving groove, and the stopper at least partially exposes out of the first receiving groove.

In some embodiments, a first elastic element is disposed in the first receiving groove, and the stopper further includes a first elastic element engaging portion, and one end of the first elastic element abuts against the first elastic element engaging portion and provides the stopper with a first biasing force moving toward the actuating rod.

In some embodiments, the actuating rod is provided with a first bottom wall located at a proximal end side of the stop groove, when the connecting rod assembly is in the first state, the stop member abuts against the first bottom wall, and the first elastic member matching portion drives the first elastic member to elastically deform.

In some embodiments, a pressing button is further disposed on one side of the firing handle, and when the pressing button moves towards the firing handle along a fourth direction, the pressing button drives the stopping piece to move towards a direction away from the actuating rod, so that the stopping piece is disengaged from the stopping groove.

In some embodiments, the stop includes a first engagement portion, the press button includes a second engagement portion, the first engagement portion includes a first ramp, the second engagement portion includes a second ramp, and the second ramp urges the first ramp such that the stop moves in a direction away from the actuation rod when the press button is moved in a fourth direction toward the firing handle.

In some embodiments, the pressing portion includes a pressing portion, a second receiving groove is disposed in the firing handle, the pressing portion at least partially protrudes into the second receiving groove, and the pressing portion at least partially exposes out of the second receiving groove.

In some embodiments, a second elastic member is disposed in the second receiving groove, and the second elastic member provides a second biasing force to the pressing button in a direction away from the firing handle.

In some embodiments, the pressing button is further provided with a first guide portion, the inside of the firing handle is provided with a second guide portion, the first guide portion enters the inside of the firing handle and is engaged with the second guide portion, and the second guide portion guides the movement of the first guide portion in a fourth direction.

In some embodiments, the proximal end surface of the stopping groove is a vertical surface, and after the stopping part at least partially enters the stopping groove, the stopping part abuts against the proximal end surface of the stopping groove.

In some embodiments, an axial length of the stop groove is greater than an axial length of the stop, and the firing handle may rotate the stop in a first direction when the linkage assembly is in the second state, such that the stop moves in a distal direction of the stop groove.

In some embodiments, the linkage assembly further comprises a third state;

when the connecting rod assembly is in the first state and the firing handle rotates in a first direction by a second angle, the connecting rod assembly is driven to enter a third state, the connecting rod assembly drives the closing pull-tab assembly to move in a proximal side direction by a second distance, the second angle is larger than the first angle, and the second distance is larger than the first distance;

or when the connecting rod assembly is in the second state and the firing handle rotates for a third angle along the first direction, the connecting rod assembly is driven to enter the third state, the connecting rod assembly drives the closing pull-tab assembly to move for a third distance towards the proximal side direction, the second angle is equal to the sum of the first angle and the third angle, and the second distance is equal to the sum of the first distance and the third distance.

In some embodiments, the linkage assembly includes a first rod and a second rod pivotally connected, the second rod being pivotally connected to the closure tab assembly, the firing handle driving the first rod to rotate to bring the linkage assembly into the second state when the linkage assembly is in the first state and the firing handle is rotated in a first direction by a first angle.

In some embodiments, when the linkage assembly enters the second state from the first state, the pivot positions of the first and second levers move toward the actuating lever.

In some embodiments, the first lever includes a first pivot and a second pivot, the second lever includes a third pivot and a fourth pivot, the first pivot of the first lever is pivotally connected to the housing of the medical stapler, the second pivot and the third pivot are pivotally connected, and the fourth pivot of the second lever is pivotally connected to the closure pull rod.

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

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

through adopting the utility model discloses, the effect of stopping of the stop groove through actuating lever setting to the stop part can with the percussion handle keeps in current position, just also keeps link assembly in the second state, keeps closed pulling-on piece subassembly in the position that needs. Thus, the second state of the linkage assembly need not correspond to a fully closed state of the stud, but may be a partially closed state between open and closed of the stud and may be maintained in this stable second state, thereby meeting the needs of different scenarios.

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 stapler body with one side of the housing removed according to an embodiment of the present invention;

fig. 3 is a partial schematic view of a closure actuator according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a rack according to an embodiment of the present invention;

fig. 5 is a bottom view of a rack according to an embodiment of the present invention;

FIG. 6 is a schematic view of the rack and stop cooperating when the stud is open according to an embodiment of the invention;

fig. 7 is a partial schematic view of a closure actuator according to an embodiment of the present invention;

fig. 8 is a top view of a closure drive mechanism according to an embodiment of the present invention;

FIG. 9 isbase:Sub>A cross-sectional view taken in the direction A-A of FIG. 8;

fig. 10 is a schematic view of the locking bar and push button combination of an embodiment of the present invention;

fig. 11 is a schematic view of the locking bar and push button combination according to an embodiment of the present invention;

FIG. 12 is a cross-sectional view of a firing handle of an embodiment of the present invention;

FIG. 13 is a schematic view of the closure drive mechanism with the head partially closed according to an embodiment of the present invention;

figure 14 is a schematic view of the rack and stop cooperating when the head of the nail is partially closed according to an embodiment of the invention;

FIG. 15 is a schematic view showing the engagement of the rack with the stopper after the rack is moved to the proximal side on the basis of FIG. 14;

FIG. 16 is a view illustrating the engagement of the rack and the stopper after the pressing button is pressed based on FIG. 14;

FIG. 17 is a schematic view of the closure drive mechanism with the head fully closed according to an embodiment of the present invention;

fig. 18 is a schematic structural view of the closure driving mechanism after the nail head is completely closed and the firing handle is reset according to an embodiment of the present invention.

Reference numerals:

1. third pin shaft of anastomat body 45

11. Fixed handle 51 closing pull rod

13. Housing 52 closing return spring

15. Handle return spring 53 closure tab

18. First elastic member of connecting rod 61

19. Second elastic member of retraction pull rod 62

2. Rack 7 stop

21. Drive teeth 71 stop

22. Stop groove 72 second end

221. Proximal end surface 73 first mating portion of the stopper groove

3. First inclined plane of trigger handle 731

31. Jaw 732 third incline

32. First drive section 75 first elastic member engaging section

33. First holding groove 8 press button

34. Second accommodating groove 81 second matching part

35. Guide groove 811 second inclined plane

4. Link assembly 812 fourth ramp

41. First lever 82 presses portion

411. Second drive portion 83 second elastic member engaging portion

412. First pivot portion 84 guide portion

413. The second pivot part 9 nails head

42. Second rod 91 nail anvil

421. Third pivot joint 911 first engaging groove

422. Fourth pivot portion 92 nail bin assembly

43. First pin 921 second matching groove

44. Second pin 93 closing pin

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 closed driving mechanism for a medical anastomat and the medical anastomat comprising the same. The closing drive mechanism includes: a closure tab assembly and a linkage assembly connected to the closure tab assembly, the linkage assembly including a first state and a second state; the actuating rod is provided with a stop groove on one side facing the connecting rod assembly; a firing handle having a stop disposed thereon. When the connecting rod assembly is in the first state and the firing handle rotates for a first angle along the first direction, the firing handle drives the connecting rod assembly to enter the second state, and the connecting rod assembly drives the closing pull-tab assembly to move towards the proximal side for a first distance, so that the nail head part of the anastomat can be closed. At the same time, the stop member at least partially enters the stop slot as the firing handle rotates, and the stop slot blocks rotation of the firing handle in a second direction opposite the first direction by blocking the stop member. The trigger handle can be kept at the current position by blocking the trigger handle from returning to the initial position along the second direction through the blocking effect of the stop groove arranged on the actuating rod on the stop, and the connecting rod assembly is also kept at the second state, so that the closing pull-tab assembly is kept at the required position. Therefore, the second state of the connecting rod assembly does not need to correspond to a fully closed state of the stud, but can be a partially closed state between open and closed of the stud, thereby meeting the requirements of different scenarios.

The structure of the closing driving mechanism according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it should be understood that the embodiments are not intended to limit the scope of the present invention.

As shown in fig. 1, the medical stapler includes a nail head 9, a stapler body 1, and the closing driving mechanism. The stapler body 1 includes 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. As shown in fig. 1 to 3, the nail head 9 includes an anvil 91 and a cartridge assembly 92, which are oppositely disposed, and the anvil 91 has an open state opened relative to the cartridge assembly 92 and a closed state closed relative to the 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 assembly 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 drive mechanism comprises a closing pull-tab 53 for closing the stud 9, the closing pull-tab 53 being arranged through the inside of the connecting rod 18. 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.

The utility model discloses in, distal end side and near-end side are for the operator, and the one end that is nearer apart from the operator is near-end side, and the one end far away apart from the operator, the one end that is more close to the operation position promptly is the distal end side, follows the direction in the axle center of anastomat is the axial, and the direction from the distal end side of anastomat to near-end side promptly, or from the near-end side of anastomat to the direction of distal end side. For example, in the perspective of fig. 1, for a stapler, the distal side is the right side and the proximal side is the left side. The direction S1 in fig. 1 is the direction from the proximal side to the distal 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. 5 is defined as a lateral direction, i.e., a width direction. The direction D1 in fig. 2 is defined as the first direction, i.e. clockwise in the view of fig. 2. The direction D2 in fig. 17 is defined as the second direction, i.e., counterclockwise in the view of fig. 17. The D3 direction in fig. 10 and 11 is defined as the third direction, and the D4 direction is defined as the fourth direction.

As shown in fig. 2-6, the closure drive mechanism further includes an actuation lever, a closure tab assembly, a linkage assembly 4, and a firing handle 3. In this embodiment, the actuating lever comprises a rack 2, a side of the rack 2 facing the connecting rod assembly 4 is provided with a plurality of driving teeth 21, the rack 2 is fixedly connected with a retraction rod 19, and the rack 2 can be driven to move along the axial direction by the retraction rod 19. The side of the rack 2 facing the connecting rod assembly 4 is also provided with a stop groove 22. The closure tab assembly includes a closure pull rod 51, the closure pull tab 53, and a biasing member configured to impart a tendency to move the linkage assembly 4 distally. In this embodiment, the biasing member is a closure return spring 52 located on the proximal side of the closure pull rod 51. The closing pull rod 51 is at least partially located at the proximal end side of the rack 2 and sleeved outside the connecting rod 18. The closing return spring 52 may be a compression spring, but the present invention is not limited thereto. In other embodiments, the closing return spring 52 may also be a tension spring, a spring plate, or other elastic structures. The linkage assembly 4 is rotatably connected to the closure link 51. The linkage assembly 4 comprises a first state shown in fig. 3 and a second state shown in fig. 13, and when the state of the linkage assembly 4 is switched, the closing pull tab 53 can be driven to move along the axial direction by the closing pull rod 51, namely, the state of the nail head is changed. The first state of the link assembly 4 corresponds to a fully open state of the head and the second state of the link assembly 4 corresponds to a partially closed state of the head.

As shown in fig. 3 to 6, the trigger handle 3 is provided with a pawl 31, a stop member 7 and a first driving portion 32, and a handle return spring 15, which may be a tension spring, is further provided between the trigger handle 3 and the housing 13. When the claw 31 is engaged with the driving teeth 21 of the rack 2 and the claw 31 moves in the distal direction, the rack 2 is driven to move in the distal direction to fire the stapler. The stop member 7 includes a stop portion 71, and the stop portion 71 protrudes from one end of the firing handle 3 facing the rack 2, in this embodiment, the stop portion 71 is disposed at a first end of the stop member 7. In the initial state, the link assembly 4 is in the first state, the stud is fully opened, the trigger handle 3 is in its initial position, and the stop portion 71 abuts against the first bottom wall of the rack 2 on the proximal side of the stop groove 22. In this state, the firing handle 3 is held, so that when the firing handle 3 rotates by a first angle in the first direction, the first driving portion 32 of the firing handle 3 drives the link assembly 4 into the second state, and the link assembly 4 drives the closure pull rod 51 and the closure pull tab 53 to move in the proximal direction by a first distance, so that the nail head portion of the stapler can be closed.

Meanwhile, after the firing handle 3 is rotated by an external force from its initial position by a first angle in a first direction, as shown in fig. 14, the stop member 7 is rotated away from the first bottom wall and at least partially enters the stop groove 22 as the firing handle 3 rotates, and after the external force is removed, the firing handle 3 is rotated in the second direction by the handle return spring 15 to perform a return movement, at which time the link assembly 4 enters the second state, and the proximal end surface 221 of the stop groove 22 blocks the stop member 7 from rotating in a second direction, which is opposite to the first direction, and also blocks the firing handle 3 from rotating in the second direction and returning to the initial position. The firing handle 3 can be kept at the current position by blocking the firing handle 3 from returning to the initial position in the second direction through the blocking effect of the stop slot 22 arranged on the rack 2 on the stop 7, namely, the connecting rod assembly 4 is kept at the second state, and the closing pull piece assembly is kept at the required position. Thus, the second condition of the linkage assembly 4 need not correspond to a fully closed condition of the head, but may be a partially closed condition between fully open and fully closed.

As shown in fig. 7, in this embodiment, the link assembly 4 includes a first rod 41 and a second rod 42, the first rod 41 includes a second driving portion 411, a first pivot portion 412 and a second pivot portion 413, and the second rod 42 includes a third pivot portion 421 and a fourth pivot portion 422. The first pivoting part 412 of the first rod 41 is pivotally connected to the housing 13 of the medical stapler by a first pin 43, so that the first pivoting part 412 only moves rotationally and not axially relative to the housing 13. The second pivot portion 413 and the third pivot portion 421 are pivotally connected by a second pin 44, and the fourth pivot portion 422 of the second rod 42 is pivotally connected to the closing rod 51 by a third pin 45. The link assembly 4 also includes a third condition shown in fig. 17, which corresponds to a fully closed condition of the head of the pin, of the link assembly 4. Wherein the first and third states of the linkage assembly 4 are stable states, while the second state of the linkage assembly 4 needs to be held stable by the firing handle 3.

As shown in fig. 8 to 12, in this embodiment, a first receiving groove 33 extending along the third direction is provided in the firing handle 3, the second end 72 of the stopper 7 enters the first receiving groove 33, and the stopping portion 71 is at least partially exposed out of the first receiving groove 33. The first receiving groove 33 is a straight groove extending in the third direction, and the stopper 7 is a rod-shaped member extending in the third direction. The stopper 7 is movable in a third direction. The first receiving groove 33 is provided with a first elastic member 61, the stopper 7 further includes a first elastic member matching portion 75, the first elastic member matching portion 75 may be a step portion, one end of the first elastic member 61 abuts against the first elastic member matching portion 75, the other end abuts against the inner wall of the first receiving groove 33, and the first elastic member 61 provides a first biasing force for the stopper 7 to move towards the rack 2. In this embodiment, the first elastic member 61 may be a compression spring, and in other embodiments, the first elastic member 61 may also be another structure such as a tension spring or a spring plate. A portion of the stopper 7 entering the first receiving groove 33 is provided with a first fitting portion 73.

As shown in fig. 8 to 12, in this embodiment, a second receiving groove 34 is further disposed on one side of the firing handle 3, a pressing button 8 is further disposed on one side of the firing handle 3, the pressing button 8 includes a pressing portion 82, a first guiding portion 84 and a second matching portion 81, and the pressing portion 82 is at least partially located outside the second receiving groove 34 for being pressed by the hand of the operator. The first guide portion 84 enters the inside of the firing handle 3 and is engaged with a second guide portion provided on an inner wall of the second receiving groove 34, and the second guide portion guides the movement of the first guide portion 84 in the fourth direction. In this embodiment, the first guide portion 84 is a protrusion, the second guide portion is the guide groove 35, and a step portion may be provided at the outermost side of the guide groove 35 to block the first guide portion 84 and prevent the pressing button 8 from moving outward too much and being removed from the firing handle 3. A second elastic member 62 is further disposed in the second receiving groove 34. The pressing button 8 further includes a second elastic member engaging portion 83, and the second elastic member 62 is sleeved on the second elastic member engaging portion 83 and located between the inner wall of the second receiving groove 34 and the step portion at the outer end of the second elastic member engaging portion 83. The second resilient member 62 provides a second biasing force to the press button 8 in a direction away from the firing handle 3. The second elastic member 62 may be a compression spring, and in other embodiments, the second elastic member 62 may also be another structure such as a tension spring, a spring plate, or the like.

As shown in fig. 11, the stopper 7 includes a first fitting portion 73, the pressing button 8 includes a second fitting portion 81, the first fitting portion 73 includes a first inclined surface 731, the second fitting portion 81 includes a second inclined surface 811, and the first inclined surface 731 and the second inclined surface 811 are inclined in the same direction, preferably at the same angle. When the pressing button 8 moves toward the firing handle 3 in the fourth direction, the second inclined surface 811 presses the first inclined surface 731, so that the stopper 7 moves away from the rack 2. In this embodiment, the first matching portion 73 further includes a third inclined surface 732 disposed opposite to the first inclined surface 731, the second matching portion 81 further includes a fourth inclined surface 812 disposed opposite to the second inclined surface 811, the third inclined surface 732 and the fourth inclined surface 812 are attached to each other or have a certain gap therebetween, and the third inclined surface 732 and the fourth inclined surface 812 incline in the same direction, and preferably have the same inclination angle.

The operation of the closure drive mechanism in this embodiment is described in more detail below with reference to fig. 3-18.

As shown in FIGS. 3-9, in the initial state, the firing handle 3 is in its initial position away from the fixed handle. The stopping portion 71 protrudes from the upper end of the firing handle 3, the rack 2 is provided with a first bottom wall located at the proximal end side of the stopping groove 22, the stopping portion 71 abuts against the first bottom wall of the rack 2 at the proximal end side of the stopping groove 22, and the first bottom wall of the rack 2 applies downward pressure to the stopping portion 71, so that the first elastic member 61 is elastically deformed. The linkage assembly 4 is in a first state, and the first driving portion 32 of the firing handle 3 abuts against the second driving portion 411 of the first lever 41. The second pivot part 413 and the third pivot part 421 are at a position far from the rack 2, there is a small axial distance between the first pivot part 412 and the fourth pivot part 422, the closing pull rod 51 is at its initial position, and the head of the stapler is in an open state.

In the state shown in fig. 3 to 12, the trigger handle 3 is held such that the trigger handle 3 is rotated by a first angle in the first direction, and the handle return spring 15 is elastically deformed. The first driving portion 32 drives the second driving portion 411, so that the first rod 41 also rotates in the first direction, and the second pivoting portion 413 and the third pivoting portion 421 move toward the rack 2 to reach a position close to the rack 2. The axial distance between the first pivot part 412 and the fourth pivot part 422 increases, so that the closing pull rod 51 moves a first distance in the proximal direction, the closing return spring 52 is driven to generate a first elastic deformation, and the closing pull rod 51 pulls the closing pull tab 53 to move a first distance in the proximal direction, so that the nail head is partially closed. At the same time, the stopper 7 rotates along with the firing handle 3 in the first direction until the stopper 71 moves to a position opposite to the stopper groove 22, and under the deformation restoring force of the first elastic member 61, the stopper 7 moves toward the rack 2 so that the stopper 71 at least partially enters the stopper groove 22. When the firing handle 3 is released, the firing handle 3 will not rotate in the first direction under the action of the handle return spring 15, and at the same time, as shown in fig. 14, the stopping portion 71 abuts against the proximal end surface 221 of the stopping groove 22 to block the rotation of the stopping member 7 in the second direction, and thus block the rotation of the firing handle 3 in the second direction, so as to keep the firing handle 3 in the state of fig. 13. In this embodiment, the proximal end surface 221 of the stopper groove 22 is a flat surface, and when the connecting rod assembly 4 is in the second state, the stopper 7 abuts against the proximal end surface 221 to increase the stability of the connecting rod assembly 4 in the second state.

Meanwhile, in the second state, as shown in fig. 13, the link assembly 4 has a tendency to move in the distal direction under the biasing force of the closing return spring 52. However, because the firing handle 3 remains in the current position, the first driving portion 32 may continue to abut against the second driving portion 411. Although the link assembly 4 does not reach the stable third state, it can still be stabilized in the second state by the abutting action of the first driving portion 32, i.e. the nail head is kept in the partially closed state. The head of the stapler can then be passed through a relatively small diameter surgical channel to the surgical field.

After the stapler's head reaches the operating area, there are two modes of operation if it is desired to open the head. The first way of operation is to drive the rack 2 a distance in the proximal direction by means of the retraction lever 19. As shown in fig. 15, the axial length of the stop groove 22 is greater than the axial length of the stop portion 71, where the axial length of the stop groove 22 refers to the groove length along the axial direction of the stapler, and corresponds to the distance between the distal end surface and the proximal end surface of the stop groove 22 in the axial direction, i.e., the available movement space of the stop portion 71 in the axial direction. In the state of fig. 14, when the rack 2 is driven to move a distance in the proximal direction by the retraction rod 19, the stopping portion 71 no longer abuts against the proximal end surface 221 of the stopping groove 22, but has a certain axial distance from the proximal end surface 221 of the stopping groove 22, and under the action of the deformation restoring force of the handle restoring spring 15, the stopping member 7 and the firing handle 3 can be rotationally restored in the second direction until the stopping portion 71 again abuts against the proximal end surface 221 of the stopping groove 22.

The second operation is by operating the push button 8. In the state of fig. 14, when the pressing knob 8 is driven in the fourth direction, the second engaging portion 81 of the pressing knob 8 drives the first engaging portion 73 of the stopper 7, so that the stopper 7 moves in a direction away from the rack 2 and further enters the first receiving groove 33, the stopper portion 71 is separated from the stopper groove 22 of the rack 2, and at this time, the stopper 7 and the firing handle 3 can be rotationally reset in the second direction by the deformation restoring force of the handle restoring spring 15. When the firing handle 3 is rotated and reset along the second direction, the connecting rod assembly 4 loses the abutting effect of the first driving portion 32 and then returns to the first state from the second state, the second pivot portion 413 and the third pivot portion 421 move in the direction away from the rack 2, and the fourth pivot portion 422 drives the closing pull rod 51 to move in the direction of the far end side, so as to drive the closing pull piece 53 to move in the direction of the far end side, and then reopen the head portion.

After opening the head, the head may be moved to the surgical site. When the nail head is moved to the operation position and the nail head needs to be closed to clamp the tissue, the firing handle 3 can be held again, so that the firing handle 3 rotates along the first direction by a second angle, the second angle is larger than the first angle, the handle return spring 15 elastically deforms, and the closing driving mechanism enters the state shown in fig. 17. The first driving portion 32 drives the first rod 41 to rotate along a first direction, the second pivot portion 413 and the third pivot portion 421 move towards the direction of the rack 2, the fourth pivot portion 422 drives the closing pull rod 51 to move towards the proximal side for a second distance, and drives the closing return spring 52 to generate a second elastic deformation, wherein the second distance is greater than the first distance, and the second elastic deformation is greater than the first elastic deformation, so that the complete closing of the nail head is realized. At this time, the link assembly 4 enters a stable third state. Even if the firing handle 3 is released and the firing handle 3 is rotationally reset in the second direction, the linkage assembly 4 can be kept in the third state shown in fig. 17 under the self-stabilization effect, i.e., the closed state of the nail head is kept unchanged. When the firing handle 3 is released, the firing handle 3 is rotationally reset in the second direction by the handle reset spring 15, and then the state shown in fig. 18 is achieved. At this time, the claw 31 on the firing handle 3 is engaged with the driving tooth 21 of the rack 2, and when the firing handle 3 is gripped again, the claw 31 can drive the rack 2 to move towards the distal end side, thereby firing the stapler.

The closing drive mechanism of this embodiment is also not limited to the above-described operation. When the closing drive mechanism is in the state shown in fig. 13 and 14, the nail head may be directly and completely closed without opening the nail head. Specifically, as shown in fig. 14, since the axial length of the stop groove 22 is greater than the axial length of the stopping portion 71, when the stopping portion 71 at least partially enters the stop groove 22 and the stopping portion 71 abuts against the proximal end surface 221 of the stop groove 22, the stopping portion 71 has a certain axial distance from the distal end surface of the stop groove 22, so that the firing handle 3 can drive the stopping portion 7 to continue rotating in the first direction. When the connecting rod assembly 4 is in the second state and the firing handle 3 rotates in the first direction by a third angle, the connecting rod assembly 4 drives the connecting rod assembly 4 to enter the third state, the connecting rod assembly 4 drives the closing pull rod 51 and the closing pull piece 53 to move in the proximal end side direction by a third distance, the second angle is equal to the sum of the first angle and the third angle, and the second distance is equal to the sum of the first distance and the third distance. Thus, in the partially closed condition of the stud, the firing handle 3 may be further grasped, such that the firing handle 3 drives the handle return spring 15 further to deform, and the firing handle 3 drives the closure pull rod 51 further in the proximal direction through the linkage assembly 4 a third distance, thereby achieving full closure of the stud, which closure drive reaches the condition shown in fig. 17.

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 drive mechanism for a medical stapler, the closure drive mechanism comprising:

a firing handle having a stop disposed thereon;

2. The closure drive mechanism of claim 1, wherein the linkage assembly includes a biasing member configured to cause the linkage assembly to have a tendency to move distally, the stop abutting against a proximal face of the stop slot when the linkage assembly is in the second state.

3. The closure drive of claim 1, wherein the stop comprises a stop protruding from an end of the firing handle facing the actuation rod, the stop at least partially entering the stop slot when the firing handle is rotated in the first direction through the first angle.

4. The closure drive of claim 3, wherein the firing handle defines a first receiving slot extending in the third direction, the stop member extends at least partially into the first receiving slot, and the stop member extends at least partially out of the first receiving slot.

5. The closure drive mechanism of claim 4, wherein the first receiving groove has a first resilient element disposed therein, and the stop element further comprises a first resilient element engaging portion, one end of the first resilient element abutting against the first resilient element engaging portion and providing the stop element with a first biasing force moving toward the actuating lever.

6. The closure drive mechanism of claim 5, wherein the actuation lever has a first bottom wall located at a proximal side of the stop slot, and when the linkage assembly is in the first state, the stop member abuts against the first bottom wall, and the first elastic member engaging portion drives the first elastic member to elastically deform.

7. The closure drive mechanism of claim 3, wherein a push button is further disposed on one side of the firing handle, wherein when the push button is moved in a fourth direction toward the firing handle, the push button drives the stop in a direction away from the actuation rod such that the stop disengages from the stop slot.

8. The closure drive mechanism of claim 7, wherein the stop includes a first engagement portion and the press button includes a second engagement portion, the first engagement portion including a first ramped surface and the second engagement portion including a second ramped surface, the second ramped surface urging the first ramped surface as the press button is moved in a fourth direction toward the firing handle such that the stop is moved in a direction away from the actuation rod.

9. The closure drive of claim 7, wherein the push button includes a push portion, wherein the firing handle defines a second receiving slot therein, wherein the push button is at least partially received within the second receiving slot, and wherein the push portion is at least partially exposed from the second receiving slot.

10. The closure drive mechanism of claim 9, wherein the second receiving channel further includes a second resilient member disposed therein, the second resilient member providing a second biasing force to the depressible button in a direction away from the firing handle.

11. The closure drive mechanism of claim 9, wherein the push button is further provided with a first guide, the interior of the firing handle is provided with a second guide, the first guide enters the interior of the firing handle and mates with the second guide, and the second guide guides movement of the first guide in a fourth direction.

12. The closure drive mechanism of claim 1, wherein a proximal surface of the stop slot is planar, and wherein the stop abuts the proximal planar surface of the stop slot when the linkage assembly is in the second state.

13. The closure drive mechanism of claim 1, wherein an axial length of the stop slot is greater than an axial length of the stop, and wherein the firing handle rotates the stop in a first direction when the linkage assembly is in the second state such that the stop moves in a distal direction of the stop slot.

14. The closure drive mechanism of claim 13, wherein the linkage assembly further comprises a third state;

15. The closure drive mechanism of claim 1, wherein the linkage assembly includes first and second pivotally connected rods, the second rod being pivotally connected to the closure tab assembly, the linkage assembly being in the first state and the firing handle rotating a first angle in a first direction, the firing handle driving the first rod to rotate to bring the linkage assembly into the second state.

16. The closure drive mechanism of claim 15, wherein the pivot location of the first and second levers moves in a direction toward the actuation lever when the linkage assembly enters the second state from the first state.

17. The closure drive mechanism of claim 16, wherein the first lever comprises a first pivot and a second pivot, the second lever comprises a third pivot and a fourth pivot, the first pivot of the first lever is pivotally connected to the housing of the medical stapler, the second pivot and the third pivot are pivotally connected, and the fourth pivot of the second lever is pivotally connected to the closure pull tab assembly.

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