WO2024017101A1

WO2024017101A1 - Closing driving mechanism and medical stapler

Info

Publication number: WO2024017101A1
Application number: PCT/CN2023/106885
Authority: WO
Inventors: 史晓杰
Original assignee: 天臣国际医疗科技股份有限公司
Priority date: 2022-07-18
Filing date: 2023-07-12
Publication date: 2024-01-25

Abstract

A closing driving mechanism and a medical stapler. The closing driving mechanism comprises: a closing pull tab assembly and a connecting rod assembly (4), wherein the connecting rod assembly (4) is connected to the closing pull tab assembly, and the connecting rod assembly (4) comprises a first state and a second state; an actuation rod, wherein a stop groove (22) is formed in the side of the actuation rod facing the connection rod assembly (4); and a firing handle (3), wherein the firing handle (3) is provided with a stop member (7); when the connecting rod assembly (4) is in the first state and the firing handle (3) rotates in a first direction (D1) by a first angle, the firing handle (3) drives the connecting rod assembly (4) to enter the second state, the connecting rod assembly (4) drives the closing pull tab assembly to move toward a proximal end side by a first distance, the stop member (7) rotates along with the firing handle (3) and at least partially enters the stop groove (22), and the stop groove (22) prevents the firing handle (3) from rotating in a second direction (D2) by means of the stop member (7), the second direction (D2) being opposite the first direction (D1). The closing driving mechanism can keep the closing pull tab assembly at a desired position, so as to maintain a partially closed state of a stapling head (9).

Description

Closing drive mechanism and medical stapler

Technical field

This application relates to the technical field of medical devices, and specifically to a closing drive 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 that cooperates with the body. The nail head includes a nail cartridge assembly and a nail anvil arranged oppositely. During surgery, first hold the firing handle and pull the closing pull tab toward the proximal side of the stapler through the closing drive mechanism, thereby closing the staple cartridge assembly and the staple anvil. Then hold the firing handle again to push the staples toward the tissue. Through the movement, the staples in the staple cartridge assembly are formed at the staple anvil to staple the tissue. At the same time, the cutter moves toward the distal side of the stapler to cut the tissue.

In actual surgical operations, sometimes it is necessary to partially close the nail head, appropriately reduce the diameter of the nail head, so that it can enter the surgical channel smoothly, and then open the nail head to continue the subsequent complete closure and Firing operation. However, the closing driving mechanism in the prior art can only switch the staple head of the stapler between fully open and fully closed states, but cannot maintain the staple head in a partially closed state between open and closed.

Contents of the invention

In view of the problems in the prior art, the purpose of this application is to provide a closing drive mechanism and a medical stapler that can maintain the closing pull tab assembly at the required position to maintain the partially closed state of the nail head.

An embodiment of the present application provides a closing driving mechanism for use in a medical stapler. The closing driving mechanism includes:

a closing pull tab assembly and a connecting rod assembly, the connecting rod assembly is connected to the closing pulling tab assembly, and the connecting rod assembly includes a first state and a second state;

an actuating rod, with a stop groove provided on one side of the actuating rod toward the connecting rod assembly;

A firing handle, the firing handle is provided with a stopper;

When the connecting rod assembly is in the first state and the firing handle rotates a first angle in a first direction, the firing handle drives the connecting rod assembly into the second state, and the connecting rod assembly drives the connecting rod assembly. The closing pull tab assembly moves a first distance in the proximal direction, and the stopper at least partially enters the firing handle as the firing handle rotates. The stop groove blocks the rotation of the firing handle in a second direction by blocking the stop piece, and the second direction is opposite to the first direction.

In some embodiments, the link assembly includes a biasing member configured to cause the link assembly to have a tendency to move distally, the link assembly being in the second state. When the stopper is pressed, the stopper resists the proximal end surface of the stopper groove.

In some embodiments, the stopper includes a stop portion, and the stop portion protrudes from an end of the firing handle toward the actuating rod, and the firing handle rotates along the first direction for a first step. When the angle is set, the stop portion at least partially enters the stop groove.

In some embodiments, the firing handle is provided with a first receiving groove extending along the third direction, the stopper at least partially enters the first receiving groove, and the stopper is at least partially exposed. outside the first containing groove.

In some embodiments, a first elastic member is provided in the first receiving groove, the stopper further includes a first elastic member fitting portion, and one end of the first elastic member resists the first elastic member. The fitting portion is configured to apply a first biasing force to the stopper toward the actuating rod.

In some embodiments, the actuation rod is provided with a first bottom wall located on the proximal side of the stop groove, and when the link assembly is in the first state, the stop member resists The first bottom wall, and the first elastic member fitting portion drives the first elastic member to elastically deform.

In some embodiments, a pressing button is further provided on one side of the firing handle. When the pressing button moves toward the firing handle in the fourth direction, the pressing button drives the stopper away from the firing handle. The directional movement of the moving rod causes the stop portion to disengage from the stop groove.

In some embodiments, the stopper includes a first fitting part, the push button includes a second fitting part, the first fitting part includes a first inclined surface, the second fitting part includes a second inclined surface, so When the pressing button moves toward the firing handle in the fourth direction, the second inclined surface presses the first inclined surface, causing the stopper to move in a direction away from the actuating rod.

In some embodiments, the pressing button includes a pressing portion, the firing handle is provided with a second receiving groove, the pressing button at least partially enters the second receiving groove, and the pressing portion is at least partially exposed. outside the second containing groove.

In some embodiments, a second elastic member is further provided in the second receiving groove, and the second elastic member is configured to apply a second biasing force to the push button in a direction away from the firing handle.

In some embodiments, the push button is further provided with a first guide portion, and the interior of the firing handle is provided with a first guide portion. a second guide part, the first guide part enters the interior of the firing handle and is fitted with the second guide part; the second guide part is configured to guide the first guide part along the fourth direction exercise.

In some embodiments, the proximal end surface of the stop groove is a flat surface, and after the stop portion at least partially enters the stop groove, the stop portion resists the proximal end surface of the stop groove. .

In some embodiments, the axial length of the stop groove is greater than the axial length of the stop portion, and when the connecting rod assembly is in the second state, the firing handle is configured to drive the stop The member rotates along the first direction, so that the stopper moves toward the distal side of the stopper groove.

In some embodiments, the link assembly further includes a third state;

When the connecting rod assembly is in the first state and the firing handle rotates a second angle along the first direction, the connecting rod assembly is driven to enter the third state, and the connecting rod assembly drives the closing The pull tab assembly moves a second distance toward the proximal side, the second angle is greater than the first angle, and the second distance is greater than the first distance;

Alternatively, when the connecting rod assembly is in the second state and the firing handle rotates a third angle along the first direction, the connecting rod assembly is driven to enter the third state, and the connecting rod assembly drives the The closing pull tab assembly moves a third distance in the proximal 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 first distance and the third angle. The sum of three distances.

In some embodiments, the link assembly includes a first lever and a second lever that are pivotally connected to the closure pull tab assembly, and the link assembly is in the first position. state and the firing handle rotates a first angle along the first direction, the firing handle drives the first rod to rotate so that the connecting rod assembly enters the second state.

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

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

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

The closing drive mechanism and medical stapler provided by this application have the following advantages:

By using this application, through the blocking effect of the stop groove provided on the actuating rod on the stopper, the firing handle can be kept in the current position, that is, the connecting rod assembly is kept in the second state, and the pull tab assembly is closed. keep in need desired location. Therefore, the second state of the connecting rod assembly does not need to correspond to the fully closed state of the nail head, but can be a partially closed state between the opening and closing of the nail head and can be maintained in this stable second state, thereby satisfying different scenarios. needs.

Description of drawings

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

Figure 1 is a schematic structural diagram of a medical stapler according to an embodiment of the present application;

Figure 2 is a schematic structural diagram of the stapler body after removing one side of the shell according to an embodiment of the present application;

Figure 3 is a partial structural schematic diagram of a closing drive mechanism according to an embodiment of the present application;

Figure 4 is a schematic structural diagram of a rack according to an embodiment of the present application;

Figure 5 is a bottom view of the rack according to an embodiment of the present application;

Figure 6 is a schematic diagram of the cooperation between the rack and the stopper when the nail head is opened according to an embodiment of the present application;

Figure 7 is a partial structural schematic diagram of a closing drive mechanism according to an embodiment of the present application;

Figure 8 is a top view of the closing drive mechanism according to an embodiment of the present application;

Figure 9 is a cross-sectional view along the A-A direction in Figure 8;

Figure 10 is a schematic diagram of the cooperation between the locking lever and the push button according to an embodiment of the present application;

Figure 11 is a schematic diagram of the cooperation between the locking lever and the push button according to an embodiment of the present application;

Figure 12 is a cross-sectional view of the firing handle according to an embodiment of the present application;

Figure 13 is a schematic structural diagram of the closing driving mechanism when the nail head is partially closed according to an embodiment of the present application;

Figure 14 is a structural schematic diagram of the cooperation between the rack and the stopper when the nail head is partially closed according to an embodiment of the present application;

Figure 15 is a structural schematic diagram of the cooperation between the rack and the stopper after the rack moves to the proximal side based on Figure 14;

Figure 16 is a structural schematic diagram of the cooperation between the rack and the stopper after pressing the push button on the basis of Figure 14;

Figure 17 is a schematic structural diagram of the closing driving mechanism when the nail head is completely closed according to an embodiment of the present application;

Figure 18 is a schematic structural diagram of the closing driving mechanism after the nail head is completely closed and the firing handle is reset according to an embodiment of the present application.

Reference signs:
1 stapler body 45 third pin
11 Fixed handle 51 Closing lever
13 Housing 52 Close return spring
15 Handle return spring 53 Closure tab
18 Connecting rod 61 First elastic member
19 Retraction lever 62 Second elastic member
2 Rack 7 Stop
21 drive tooth 71 stop
22 Stop groove 72 Second end
221 Proximal end surface of the stop groove 73 First fitting part
3 Firing handle 731 first bevel
31 Claw 732 Third bevel
32 First driving part 75 First elastic member fitting part
33 First receiving slot 8 push button
34 Second receiving groove 81 Second fitting part
35 Guide groove 811 Second slope
4 Connecting Rod Assembly 812 Fourth Incline
41 First rod 82 Pressing part
411 Second driving part 83 Second elastic member fitting part
412 First pivot part 84 Guide part
413 Second pivot joint 9 nail head
42 Second Rod 91 Anvil
421 The third pivot part 911 The first matching groove
422 Fourth pivot part 92 Nail cartridge assembly
43 first pin 921 second matching groove
44 Second pin 93 Closing pin

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in various 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 concepts of the example embodiments. To those skilled in the art. The same reference numerals in the drawings represent the same or similar structures, and thus their repeated description will be omitted. In the manual The words "or" and "or" may mean "and" or "or". Although the terms "upper,""lower,""between," etc. may be used in this specification to describe various illustrative features and elements of the present application, these terms are used herein for convenience only, such as in the drawings. direction of the example described. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of a structure to fall within the scope of this application. Although "first" or "second" are used in this specification to refer to certain features, they are only used for expression purposes and serve as limitations on the number and importance of specific features.

The present application provides a closing driving mechanism for a medical stapler and a medical stapler including the closing driving mechanism. The closing drive mechanism includes: a closing pull tab assembly and a connecting rod assembly, the connecting rod assembly is connected to the closing pulling tab assembly, the connecting rod assembly includes a first state and a second state; an actuating rod, the A stop groove is provided on one side of the actuating rod toward the connecting rod assembly; a firing handle is provided with a stopper. When the connecting rod assembly is in the first state and the firing handle rotates a first angle in a first direction, the firing handle drives the connecting rod assembly into the second state, and the connecting rod assembly drives the connecting rod assembly. The closing pull tab assembly moves a first distance in the proximal direction, so that the nail head part of the stapler can be partially closed. At the same time, the stopper at least partially enters the stop groove as the firing handle rotates, and the stop groove blocks the stopper to block the rotation of the firing handle in the second direction, so The second direction is opposite to the first direction. Through the blocking effect of the stop groove provided on the actuating rod on the stopper, the firing handle is blocked from returning to the initial position along the second direction, and the firing handle can be kept at the current position, that is, the connecting rod assembly is kept at the second position. status, holding the closure tab assembly in the desired position. Therefore, the second state of the connecting rod assembly does not need to correspond to the fully closed state of the nail head, but may be a partially closed state between the open and closed state of the nail head, thereby meeting the needs of different scenarios.

The structure of the closing driving mechanism of each specific embodiment of the present application will be described in detail below with reference to the accompanying drawings. It can be understood that each specific embodiment does not limit the scope of protection of the present application.

As shown in Figure 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 fixed 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 FIGS. 1 to 3 , the nail head 9 includes a nail anvil 91 and a nail cartridge assembly 92 arranged oppositely. The nail anvil 91 has an open state relative to the nail cartridge assembly 92 and a nail cartridge assembly 92 . The staple cartridge assembly 92 is in a closed state. The proximal side of the nail anvil 91 is provided with an inclined first fitting groove 911, the proximal side of the nail cartridge assembly 92 is provided with an axially extending second fitting groove 921, and a closing pin 93 is simultaneously provided in all the fitting grooves 911. in the first fitting groove 911 and the second fitting groove 921 . The closing driving mechanism includes a closing pull tab 53 (shown in FIG. 3 ) for closing the nail head 9 , and the closing pull tab 53 is passed through the interior of the connecting rod 18 . The distal end side of the closing tab 53 is connected to the closing pin 93 . In the initial state, The closing pin 93 is located on the distal side of the second fitting groove 921, and the nail 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 fitting groove 921, the nail anvil 91 enters the closed state. At this time, the nail anvil 91 and The staple cartridge assembly 92 clamps tissue. The process in which the nail anvil 91 enters the closed state from the open state is called the closing process of the nail head 9, that is, the closing process of the stapler. During the firing process of the stapler, it is necessary to keep the nail head 9 closed. After the stapler is fired, when the closing pin 93 and the closing pull tab 53 move toward the distal direction, the nail head 9 can be opened.

In this application, the distal side and the proximal side are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical site is the distal side. The end side refers to the direction along the axis of the stapler as 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 perspective of FIG. 1 , the distal side of the stapler is the right side and the proximal side is the left side. The S1 direction in Figure 1 is the direction from the proximal side to the distal side of the stapler. Define the S1 direction or the direction opposite to the S1 direction as the axial direction of the stapler. Define the S2 direction in Figure 2 as the longitudinal direction, that is, the height direction. The S3 direction in Figure 5 is defined as the transverse direction, that is, the width direction. Define the D1 direction in Figure 2 as the first direction, that is, the clockwise direction in the perspective of Figure 2. Define the D2 direction in Figure 17 as the second direction, that is, the counterclockwise direction in the perspective of Figure 17. Define the D3 direction in Figures 10 and 11 as the third direction, and the D4 direction as the fourth direction.

As shown in Figures 2 to 6, the closing driving mechanism also includes an actuating rod, a closing pull tab assembly, a connecting rod assembly 4 and a firing handle 3. In this embodiment, the actuating rod includes a rack 2. A plurality of driving teeth 21 are provided on one side of the rack 2 facing the link assembly 4. The rack 2 is fixed to the retracting pull rod 19. The rack 2 can be driven to move in the axial direction by operating the retracting pull rod 19. A stop groove 22 is also provided on the side of the rack 2 facing the connecting rod assembly 4 . The closing pull tab assembly includes a closing pull rod 51 , the closing pull tab 53 and a biasing member. The biasing member is configured to make the link assembly 4 tend to move toward the distal side. In this embodiment, the biasing member is a closing return spring 52 located on the proximal side of the closing lever 51 . The closing pull rod 51 is at least partially located on the proximal end side of the rack 2 and is sleeved on the outside of the connecting rod 18 . The closing return spring 52 may be a compression spring, but the application is not limited thereto. In other embodiments, the closing return spring 52 may also be a tension spring, a spring piece, or other elastic structures. The link assembly 4 is rotatably connected to the closing pull rod 51 . The link assembly 4 includes a first state shown in Figure 3 and a second state shown in Figure 13. When the state of the link assembly 4 is switched, the closing pull tab 53 can be driven to move in the axial direction through the closing pull rod 51, that is, Change the state of the nail head. The first state of the connecting rod assembly 4 corresponds to the fully open state of the nail head, and the third state of the connecting rod assembly 4 The second state corresponds to the partially closed state of the nail head.

As shown in Figures 3 to 6, the firing handle 3 is provided with a claw 31, a stopper 7 and a first driving part 32. A handle return spring is also provided between the firing handle 3 and the housing 13. 15, optionally a tension spring. 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 stopper 7 includes a stopper 71 , and the stopper 71 protrudes from one end of the firing handle 3 toward the rack 2 . In this embodiment, the stopper 71 is disposed on the stopper 71 . The first end of the stopper 7. In the initial state, the connecting rod assembly 4 is in the first state, the nail head is fully opened, the firing handle 3 is in its initial position, and the stopper 71 resists the rack 2. The first bottom wall on the proximal side of the stop groove 22 . In this state, when the firing handle 3 is held and the firing handle 3 is rotated at a first angle in the first direction, the first driving part 32 of the firing handle 3 drives the connecting rod assembly 4 into the first direction. In the second state, the connecting rod assembly 4 drives the closing pull rod 51 and the closing pull tab 53 to move a first distance in the proximal direction, so that the nail head part of the stapler can be partially closed.

At the same time, after the firing handle 3 is rotated by a first angle in the first direction from its initial position by an external force, as shown in Figure 14, the stopper 7 rotates away from the first bottom as the firing handle 3 rotates. The wall at least partially enters the stop groove 22. After the external force is removed, under the action of the handle return spring 15, the firing handle 3 rotates along the second direction to cause a reset movement. At this time, the The connecting rod assembly 4 enters the second state, and the proximal end surface 221 of the stop groove 22 blocks the rotation of the stop member 7 in the second direction, thereby blocking the rotation of the firing handle 3 in the second direction. Rotate back to the initial position, and the second direction is opposite to the first direction. Through the blocking effect of the stopper groove 22 provided on the rack 2 on the stopper 7, the firing handle 3 is blocked from returning to the initial position along the second direction, and the firing handle 3 can be kept at the current position, that is, the connecting rod can be maintained. Assembly 4 is in the second state, holding the closure pull tab assembly in the desired position. Therefore, the second state of the link assembly 4 does not need to correspond to a state in which the nail head is fully closed, but may be a partially closed state between the fully open and fully closed state of the nail head.

As shown in Figure 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 part 411, a first pivot part 412 and a third Two pivot parts 413. The second rod 42 includes a third pivot part 421 and a fourth pivot part 422. The first pivot portion 412 of the first rod 41 is pivotally connected to the housing 13 of the medical stapler through the first pin 43, so that the first pivot portion 412 only has rotational movement relative to the housing 13. , without axial movement. The second pivot portion 413 and the third pivot portion 421 are pivotally connected through a second pin 44 , and the fourth pivot portion 422 of the second rod 42 is pivotally connected through a third pin 45 to the closing lever 51. The connecting rod assembly 4 also includes a third state shown in Figure 17. The connecting rod assembly The third state of the piece 4 corresponds to the fully closed state of the nail head. Among them, the first state and the third state of the connecting rod assembly 4 are two stable states respectively, that is, the connecting rod assembly 4 can maintain stability by relying on its own structural characteristics in the first state and the third state. The second state of the connecting rod assembly 4 needs to be maintained stable by the firing handle 3 .

As shown in Figures 8 to 12, in this embodiment, the firing handle 3 is provided with a first receiving groove 33 extending in the third direction, and the second end 72 of the stopper 7 enters the first receiving groove 33. In the receiving groove 33 , the stop portion 71 is at least partially exposed outside the first receiving groove 33 . The first receiving groove 33 is a straight groove extending along the third direction, and the stopper 7 is a rod-shaped component extending along the third direction. The stopper 7 can move in the third direction. A first elastic member 61 is provided in the first receiving groove 33. The stopper 7 also includes a first elastic member fitting portion 75. The first elastic member fitting portion 75 may be a step portion. One end of an elastic member 61 resists the first elastic member fitting portion 75 , and the other end resists the inner wall of the first receiving groove 33 . The first elastic member 61 is configured to provide support to the stopper 7 A first biasing force is applied toward the rack 2 . In this embodiment, the first elastic member 61 may be a compression spring. In other embodiments, the first elastic member 61 may also be a tension spring, an elastic piece, or other structures. The portion of the stopper 7 that enters the first receiving groove 33 is provided with a first fitting portion 73 .

As shown in Figures 8 to 12, in this embodiment, a second receiving groove 34 is also provided on one side of the firing handle 3, and a pressing button 8 is also provided on one side of the firing handle 3. The pressing button 8 includes a pressing part 82, a first guide part 84 and a second fitting part 81. The pressing part 82 is at least partially located outside the second receiving groove 34 for pressing by the operator's hand. The first guide portion 84 enters the interior of the firing handle 3 and is fitted with a second guide portion provided on the inner wall of the second receiving groove 34 . The second guide portion is configured to guide the first guide portion 84 Movement along said fourth direction. In this embodiment, the first guide part 84 is a convex part, the second guide part is a guide groove 35, and a step part may be provided on the outermost side of the guide groove 35, so as to adjust the first guide part 84 to a protruding part. A guide portion 84 blocks and prevents the pressing button 8 from moving too much outward and falling out of the firing handle 3 . A second elastic member 62 is also provided in the second receiving groove 34 . The push button 8 also includes a second elastic member fitting portion 83. The second elastic member 62 is sleeved on the second elastic member fitting portion 83 and is located between the inner wall of the second receiving groove 34 and the second elastic member. between the stepped portions at the outer end of the fitting portion 83. The second elastic member 62 is configured to exert a second biasing force on the pressing button 8 in a direction away from the firing handle 3 . The second elastic member 62 may be a compression spring. In other embodiments, the second elastic member 62 may also be a tension spring, a spring, or other structures.

As shown in Figure 11, the stopper 7 includes a first fitting portion 73, and the pressing button 8 includes a second fitting portion. 81. The first fitting part 73 includes a first inclined surface 731, and the second fitting part 81 includes a second inclined surface 811. The inclination direction of the first inclined surface 731 and the second inclined surface 811 is consistent, and the preferred inclination angle is consistent. 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 , causing the stopper 7 to move away from the rack 2 . In this embodiment, the first fitting part 73 further includes a third inclined surface 732 arranged opposite to the first inclined surface 731 , and the second fitting part 81 further includes a third inclined surface 732 arranged opposite to the second inclined surface 811 . The four inclined surfaces 812, the third inclined surface 732 and the fourth inclined surface 812 are either close to each other or have a certain gap, and the inclination directions of the third inclined surface 732 and the fourth inclined surface 812 are consistent, and preferably have the same inclination angle.

The working process of the closing driving mechanism in this embodiment will be introduced in detail below with reference to Figures 3 to 18.

As shown in Figures 3 to 9, in the initial state, the firing handle 3 is in its initial position away from the fixed handle. The stop portion 71 protrudes from the upper end of the firing handle 3. The rack 2 is provided with a first bottom wall located on the proximal side of the stop groove 22. The stop portion 71 is connected to the tooth. The first bottom wall of the rack 2 on the proximal side of the stop groove 22 resists, and the first bottom wall of the rack 2 exerts downward pressure on the stop portion 71 , so that the first elastic Part 61 undergoes elastic deformation. The connecting rod assembly 4 is in the first state, and the first driving part 32 of the firing handle 3 resists the second driving part 411 of the first rod 41 . The second pivot part 413 and the third pivot part 421 are at a position away from the rack 2, and there is a smaller gap between the first pivot part 412 and the fourth pivot part 422. axial distance, the closing pull rod 51 is in its initial position, and the staple head of the stapler is in an open state.

In the state shown in Figures 3 to 12, the firing handle 3 is held so that the firing handle 3 rotates a first angle along the first direction, and the handle return spring 15 is elastically deformed. The first driving part 32 drives the second driving part 411, so that the first rod 41 also rotates in the first direction, so that the second pivot part 413 and the third pivot part 421 move toward the direction of the rack 2. Get to a position close to rack 2. The axial distance between the first pivot portion 412 and the fourth pivot portion 422 increases, causing the closing lever 51 to move a first distance in the proximal direction, driving the closing return spring 52 to undergo a first elastic deformation. , 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 part is closed. At the same time, the stopper 7 rotates in the first direction with the firing handle 3 until the stopper 71 moves to a position opposite to the stopper groove 22. After the deformation of the first elastic member 61 Under the action of the restoring force, the stopper 7 moves toward the rack 2 , so that the stopper 71 at least partially enters the stopper groove 22 . Release the firing handle 3. The firing handle 3 will not continue to rotate in the first direction under the action of the handle return spring 15. At the same time, as shown in Figure 14, the stopper 71 and the stopper will not continue to rotate in the first direction. The proximal end surface 221 of the blocking groove 22 resists and blocks the stopper 7 from moving in the second direction. Rotate, that is, the firing handle 3 is blocked from rotating in the second direction, and the firing handle 3 is kept in the state of FIG. 13 . In this embodiment, the proximal end surface 221 of the stopper groove 22 is a flat surface. When the link assembly 4 is in the second state, the stopper 7 is in contact with the proximal end surface 221 to increase the stability of the link assembly 4 in the second state.

At the same time, in the second state, as shown in FIG. 13 , under the biasing force of the closing return spring 52 , the link assembly 4 has a tendency to move toward the distal side. However, because the firing handle 3 remains in the current position, the first driving part 32 can continue to resist the second driving part 411 . Although the connecting rod assembly 4 has not reached the stable third state, it can still be stabilized in the second state under the resistance of the first driving part 32 to the second driving part 411, that is, the nail head is kept in the stable state. Partially closed state. At this time, the nail head of the stapler can be passed through a surgical channel with a relatively small diameter to reach the surgical area.

After the nail head of the stapler reaches the surgical area, if it is necessary to open the nail head, there are two methods of operation. The first operation mode is to drive the rack 2 to move a certain distance in the proximal direction by retracting the pull rod 19 . As shown in Figure 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. , corresponding to the distance in the axial direction between the distal end surface and the proximal end surface of the stop groove 22 , that is, 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 certain distance in the proximal direction by retracting the pull rod 19 , the stopper 71 no longer resists the proximal surface 221 of the stopper groove 22 , but There is a certain axial distance from the proximal end surface 221 of the stop groove 22. Under the action of the deformation restoring force of the handle return spring 15, the stop member 7 and the firing handle 3 can be rotated and reset along the second direction. Until the stop portion 71 resists the proximal end surface 221 of the stop groove 22 again.

The second mode of operation is by operating the push button 8 . In the state of FIG. 14 , when the push button 8 is driven in the fourth direction, the second fitting portion 81 of the push button 8 drives the first fitting portion 73 of the stopper 7 so that the stopper 7 faces away from the rack 2 moves further into the first receiving groove 33, and the stop portion 71 is separated from the stop groove 22 of the rack 2. At this time, under the action of the deformation restoring force of the handle return spring 15, the stop portion 71 is separated from the stop groove 22 of the rack 2. The component 7 and the firing handle 3 can be rotated and reset in the second direction. When the firing handle 3 is rotated and reset in the second direction, the link assembly 4 will return to the first state from the second state after losing the resistance of the first driving part 32, and the second pivot will return to the first state. The connecting portion 413 and the third pivot portion 421 move in a direction away from the rack 2, and the fourth pivot portion 422 drives the closing pull rod 51 to move in the distal direction, thereby driving the closing pull tab 53 to move distally. Move end-to-side to reopen the nail head.

After opening the nail head, the nail head can be moved to the surgical position. When the nail head moves to the surgical 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 in the first direction. When the second angle is rotated, and the second angle is greater than the first angle, the handle return spring 15 undergoes elastic deformation, and the closing driving mechanism enters the state shown in Figure 17 . The first driving part 32 drives the first rod 41 to rotate in the first direction, the second pivot part 413 and the third pivot part 421 move toward the direction of the rack 2 , and the fourth pivot part The connecting portion 422 drives the closing pull rod 51 to move a second distance in the proximal direction, driving the closing return spring 52 to undergo a second elastic deformation. The second distance is greater than the first distance, and the second elastic deformation is greater than the first distance. An elastic deformation realizes the complete closing of the nail head. At this time, the connecting rod assembly 4 enters a stable third state. Even if the firing handle 3 is released and the firing handle 3 is rotated and reset in the second direction, the connecting rod assembly 4 can remain in the third state shown in Figure 17 due to its own stabilization, that is, the nail head is maintained. The closed state of the part remains unchanged. Release the firing handle 3. After the firing handle 3 rotates and resets in the second direction under the action of the handle return spring 15, it reaches the state shown in Figure 18. At this time, the claws 31 on the firing handle 3 are engaged with the driving teeth 21 of the rack 2. When the firing handle 3 is held again, the claws 31 can drive the rack 2 to move toward the distal direction, thereby triggering the firing. stapler.

The closing driving mechanism of this embodiment is not limited to the above working process. When the closing driving mechanism is in the state shown in FIGS. 13 and 14 , the nail head may be completely closed directly 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 stop portion 71 , the stop portion 71 at least partially enters the stop groove 22 and the When the stop portion 71 resists the proximal end surface 221 of the stop groove 22, there is a certain axial distance between the stop portion 71 and the distal end surface of the stop groove 22, so that the firing handle 3 is configured In order to drive the stopper 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 a third angle in the first direction, the connecting rod assembly 4 drives the connecting rod assembly 4 to enter the third state. The assembly 4 drives the closing pull rod 51 and the closing pull tab 53 to move a third distance in the proximal 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 The sum of the first distance and the third distance. Therefore, when the nail head is partially closed, the firing handle 3 can be further held, so that the firing handle 3 drives the handle return spring 15 to further deform, and the firing handle 3 drives the closing pull rod 51 further to the proximal end through the link assembly 4 The third distance is moved in the lateral direction, thereby achieving complete closure of the nail head, and the closing driving mechanism reaches the state shown in Figure 17 .

The above content is a further detailed description of the present application in combination with specific preferred embodiments, and it cannot be concluded that the specific implementation of the present application is limited to these descriptions. For those of ordinary skill in the technical field to which this application belongs, several simple deductions or substitutions can be made without departing from the concept of this application, which should be regarded as falling within the protection scope of this application.

Claims

A closing driving mechanism, characterized in that it is used in a medical stapler, and the closing driving mechanism includes:

a closing pull tab assembly and a connecting rod assembly, the connecting rod assembly is connected to the closing pulling tab assembly, and the connecting rod assembly includes a first state and a second state;

an actuating rod, with a stop groove provided on one side of the actuating rod toward the connecting rod assembly;

A firing handle, the firing handle is provided with a stopper;

When the connecting rod assembly is in the first state and the firing handle rotates a first angle in a first direction, the firing handle drives the connecting rod assembly into the second state, and the connecting rod assembly drives the connecting rod assembly. The closing pull tab assembly moves a first distance in the proximal direction, the stopper at least partially enters the stop groove as the firing handle rotates, and the stop groove blocks the stopper to Rotation of the firing handle in a second direction opposite to the first direction is blocked.
The closing drive mechanism according to claim 1, wherein the link assembly includes a biasing member configured to cause the link assembly to have a tendency to move in a distal direction, the When the connecting rod assembly is in the second state, the stopper resists the proximal end surface of the stopper groove.
The closing drive mechanism according to claim 1, wherein the stopper includes a stop portion protruding from an end of the firing handle toward the actuating rod, the firing handle When rotating along the first direction by the first angle, the stopper at least partially enters the stopper groove.
The closing drive mechanism according to claim 3, wherein the firing handle is provided with a first receiving groove extending in the third direction, and the stopper at least partially enters the first receiving groove, and The stopper is at least partially exposed outside the first receiving groove.
The closing driving mechanism according to claim 4, characterized in that a first elastic member is provided in the first receiving groove, the stopper further includes a first elastic member fitting portion, and the first elastic member has a One end resists the first elastic member fitting portion and is configured to apply a first biasing force to the stopper toward the actuating rod.
The closing drive mechanism according to claim 5, wherein the actuating rod is provided with a first bottom wall located on the proximal side of the stop groove, and when the connecting rod assembly is in the first state , the stopper resists the first bottom wall, and the first elastic member fitting portion drives the first elastic member to elastically deform.
The closing drive mechanism according to claim 3, wherein a pressing button is further provided on one side of the firing handle. When the pressing button moves toward the firing handle in the fourth direction, the pressing button drives the firing handle. The stopper moves in a direction away from the actuating rod, so that the stopper portion is disengaged from the stopper groove.
The closing drive mechanism according to claim 7, wherein the stopper includes a first fitting part, the pressing button includes a second fitting part, the first fitting part includes a first slope, and the third The two mating parts include a second inclined surface. When the pressing button moves toward the firing handle in the fourth direction, the second inclined surface presses the first inclined surface so that the stopper moves away from the actuating handle. directional movement of the rod.
The closing drive mechanism according to claim 7, wherein the pressing button includes a pressing portion, a second receiving groove is provided in the firing handle, and the pressing button at least partially enters the second receiving groove, And the pressing part is at least partially exposed outside the second receiving groove.
The closing driving mechanism according to claim 9, wherein a second elastic member is further provided in the second receiving groove, and the second elastic member is configured to exert a force on the pressing button in the direction of moving away from the firing button. The second bias force in the direction of the handle.
The closing drive mechanism according to claim 9, wherein the pressing button is further provided with a first guide part, the firing handle is provided with a second guide part inside, and the first guide part enters the firing handle. The inside of the handle is fitted with the second guide part, and the second guide part is configured to guide the movement of the first guide part along the fourth direction.
The closing driving mechanism according to claim 3, wherein the proximal end surface of the stop groove is a flat surface, and when the connecting rod assembly is in the second state, the stop portion and the stop The proximal faces of the grooves fit together.
The closing driving mechanism according to claim 3, wherein the axial length of the stop groove is greater than the axial length of the stop portion, and when the connecting rod assembly is in the second state, the The firing handle is configured to drive the stopper to rotate in the first direction, so that the stopper moves toward the distal side of the stopper groove.
The closing drive mechanism of claim 13, wherein the link assembly further includes a third state;

When the connecting rod assembly is in the first state and the firing handle rotates a second angle along the first direction, the connecting rod assembly is driven to enter the third state, and the connecting rod assembly drives the closing The pull tab assembly moves a second distance toward the proximal side, the second angle is greater than the first angle, and the second distance is greater than the first distance;

Alternatively, when the connecting rod assembly is in the second state and the firing handle rotates a third angle along the first direction, the connecting rod assembly is driven to enter the third state, and the connecting rod assembly drives the The closing pull tab assembly moves a third distance in the proximal direction, and the second angle is equal to the sum of the first angle and the third angle, The second distance is equal to the sum of the first distance and the third distance.
The closing drive mechanism according to claim 1, wherein the link assembly includes a first rod and a second rod that are pivotally connected, and the second rod is pivotally connected to the closing pull tab assembly, so When the connecting rod assembly is in the first state and the firing handle rotates a first angle in the first direction, the firing handle drives the first rod to rotate so that the connecting rod assembly enters the third Two states.
The closing drive mechanism according to claim 15, characterized in that when the link assembly enters the second state from the first state, the pivot positions of the first rod and the second rod face toward Directional movement of the actuating rod.
The closing drive mechanism of claim 16, wherein the first lever includes a first pivot portion and a second pivot portion, and the second lever includes a third pivot portion and a fourth pivot portion. , the first pivot portion of the first lever is pivotally connected to the housing of the medical stapler, the second pivot portion and the third pivot portion are pivotally connected, and the second lever The fourth pivot portion is pivotally connected to the closing pull tab assembly.
A medical stapler, characterized by comprising the closing driving mechanism according to any one of claims 1 to 17.