WO2023109787A1

WO2023109787A1 - Drive mechanism and medical stapler

Info

Publication number: WO2023109787A1
Application number: PCT/CN2022/138532
Authority: WO
Inventors: 丁水澄
Original assignee: 天臣国际医疗科技股份有限公司
Priority date: 2021-12-14
Filing date: 2022-12-13
Publication date: 2023-06-22

Abstract

Provided in the present invention are a drive mechanism and a medical stapler. The drive mechanism comprises: a firing handle comprising a drive member, the firing handle being rotatable in a first direction; an actuating lever provided with a rack on the side of the actuating lever facing the firing handle; and a stop member comprising a stop portion, the stop portion being at least partially movably arranged on the side of the actuating lever where the rack is arranged, and the stop portion being movable between a first location area and a second location area, wherein the stop portion is located in the first location area, and when the firing handle is rotated in the first direction, the drive member abuts against the stop portion, such that the drive member does not drive a motion of the rack. According to the present invention, by means of the arrangement of the stop member, when the firing handle is held to close a staple head portion, due to the stopping effect of the stop portion, the drive member of the firing handle does not engage with the rack, so that the rack is not driven to move to a distal side, and the stapler thus cannot be fired.

Description

Driving mechanism and medical stapler

technical field

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

Background technique

The medical stapler includes a medical stapler body, a firing handle movably connected to the medical stapler body, and a nail head matched with the body. The nail head includes a nail cartridge assembly and a nail anvil which are oppositely arranged. During the operation, the operator first holds the firing handle, and pulls the closing tab to move toward the proximal side of the stapler through the closing switching mechanism, thereby closing the staple cartridge assembly and the staple anvil, that is, completing the closure of the staple head. Then, the operator holds the firing handle again, and can push the staples in the staple cartridge assembly to move toward the tissue, and through the forming of the staples at the anvil, the tissues are anastomosed, while the cutter moves to the distal side to cut the tissue, Realize the triggering of the stapler.

However, in the existing staplers, both the control of nail head closure and the firing of the stapler are realized by the operator holding the firing handle. During the process of controlling the closure of the staple head by the firing handle, it is expected that the firing drive mechanism of the stapler can be stably maintained at the initial position and initial state, so as to avoid false firing of the stapler when the staple head is closed.

Contents of the invention

In view of the problems in the prior art, the object of the present invention is to provide a driving mechanism and a medical stapler. When the firing handle is held to close the nail head, the firing handle cannot fire the stapler due to the stopper.

An embodiment of the present invention provides a driving mechanism for a medical stapler, the driving mechanism includes:

a firing handle, including a drive member, the firing handle is rotatable in a first direction;

an actuating rod, the actuating rod is provided with a rack on one side facing the firing handle;

The stopper includes a stopper part, the stopper part is at least partly movably provided on the side of the actuating rod provided with the rack, and the stopper part can be between the first position area and the second position area move;

Wherein, the stop part is located in the first position area, and when the firing handle rotates along the first direction, the driving part is opposed to the stop part, so that the driving part does not drive The rack moves.

In some embodiments, the stopper at least partially protrudes from the outer side of the rack, and can move axially relative to the rack, or, the rack is provided with a The avoidance part, the stopper at least partially enters the avoidance part, and can move axially relative to the avoidance part.

In some embodiments, the escape portion is a groove disposed at the lateral middle of the rack and recessed in a direction away from the firing handle.

In some embodiments, the side surface of the stopper facing the firing handle is flush with the side surface of the rack facing the firing handle, or, the stopper is facing the firing handle One side surface of the rack protrudes from the side surface of the rack facing the firing handle.

In some embodiments, the stopper is located in the second position area, and when the firing handle rotates in the first direction, the driving part of the firing handle cooperates with the rack to drive The actuating rod moves toward the distal side of the stapler.

In some embodiments, the first position area is located at the distal side of the second position area, and when the stopper is located at the first position area, the stopper is located at the far side of the driving member. The end faces one side of the rack, and when the stop part is located in the second position area, the stop part is located on the proximal side of the distal end of the driving member.

In some embodiments, the stopper further includes a stopper body and a connection arm, the stopper body is connected to the stopper through the connection arm, and the stopper body can be relatively The housing of the stapler moves axially.

In some embodiments, one of the stopper body and the housing of the stapler is provided with a chute extending axially, and the other is provided with a guide block;

The guide block at least partially enters the chute and can move along the extending direction of the chute.

In some embodiments, a switching button is also included, the switching button includes a first matching portion and a second matching portion, and the switching button is axially fixed to the shell of the stapler;

When the first fitting part of the switching button is matched with the stopper body, the stopper part is located in the first position area, and when the second matching part of the switching button is matched with the stopper body , the stopper is located in the second position area.

In some embodiments, the width of the first matching portion in the axial direction is smaller than the width of the second matching portion in the axial direction, and the first matching portion and the second matching portion are arranged in a transverse direction.

In some embodiments, the stopper body includes an accommodating cavity, the accommodating cavity includes a first inner wall and a second inner wall oppositely arranged, and the switch button includes a first side and a second side;

The switching button at least partially enters the accommodating cavity, and the first side of the switching button fits with the first inner wall of the accommodating cavity.

In some embodiments, an elastic member is disposed between the second side of the switch button and the second inner wall of the accommodating cavity, and the elastic member is configured to apply a force to the switch button toward the accommodating cavity. The biasing force of the first side wall.

In some embodiments, the entire second side of the switching button is a plane extending in the transverse direction, and the first side of the second matching portion of the switching button faces toward the near side relative to the first side of the first matching portion. Protruding sideways.

In some embodiments, the first side of the switch button is provided with a guide surface, and the guide surface is connected between the first side of the first matching portion and the first side of the second matching portion.

In some embodiments, the switch button is provided with a first matching portion and two second matching portions, and the two second matching portions are arranged on both sides of the first matching portion along the lateral direction.

In some embodiments, the second matching portion is disposed outside the first matching portion, and the switch button further includes a button portion located outside the second matching portion, and the button portion is at least partially exposed on the Outside the shell of the stapler.

In some embodiments, the housing of the stapler is provided with a support that protrudes inwardly, the stopper body is disposed at the support, and the stopper body can move along the support. axial movement.

In some embodiments, the stopper body is located on the distal side of the driver, the connecting arm includes a first arm and a second arm connected, and the stopper body passes through the second arm in turn. The arm and the first arm are connected to the stop portion, the stop portion being arranged on the proximal side of the first arm.

In some embodiments, the second arm extends longitudinally, the first arm extends axially, and the stopper protrudes from the proximal side of the first arm toward the firing handle. bump.

In some embodiments, the proximal side of the first arm at least partially enters the escape portion, and the surface of the proximal side of the first arm facing the firing handle does not protrude from the rack One side surface facing the firing handle.

In some embodiments, the side surface of the stop portion facing the firing handle is a plane parallel to the axial direction.

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

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

The invention provides a driving mechanism for a medical stapler. By setting a stopper, in the process of holding the firing handle to close the nail head, due to the stopper function of the stopper, the driving part of the firing handle will not come into contact with the nail head. When the racks cooperate, the racks will not be driven to move to the distal side, and the stapler cannot be fired, which improves the safety and effectiveness of the stapler.

Description of drawings

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

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

Fig. 2 is a schematic diagram of the stapler body in an embodiment of the present invention after one side of the shell is removed;

Fig. 3 is a structural schematic diagram of the cooperation between the housing and the switching assembly in the initial state of an embodiment of the present invention;

Fig. 4 is a structural schematic diagram of a driving mechanism according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of the cooperation between the switching assembly and the actuating lever according to an embodiment of the present invention, and the stopper is located in the first position area;

Fig. 6 is a schematic structural diagram of a switch assembly according to an embodiment of the present invention;

Fig. 7 is a structural schematic diagram of cooperation between a stopper and an actuating rod according to an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a switch assembly according to an embodiment of the present invention, the stopper is located in the first position area;

Fig. 9 is a schematic structural diagram of a switching button according to an embodiment of the present invention;

Fig. 10 is a schematic structural view of the driving assembly when holding the firing handle according to an embodiment of the present invention;

Fig. 11 is a schematic structural view of the driving assembly after the nail head is closed according to an embodiment of the present invention;

Fig. 12 is a schematic structural diagram of a switch assembly according to an embodiment of the present invention, the stopper is located in the second position area;

Fig. 13 is a structural schematic diagram of the cooperation between the switch assembly and the housing according to an embodiment of the present invention;

Fig. 14 is a schematic diagram of the cooperation between the claw and the stopper of the firing handle according to an embodiment of the present invention, and the stopper is located in the second position area;

Fig. 15 is a schematic structural view of the driving assembly according to an embodiment of the present invention, the stopper is located in the second position area.

Detailed ways

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

The invention provides a driving mechanism for a medical stapler and a medical stapler comprising the same. The stapler also includes a nail head and a stapler body, and the nail head is disposed on the distal side of the stapler body. The driving mechanism includes: a firing handle, including a driving member, and the firing handle is rotatable in a first direction; an actuating rod, a rack is provided on a side of the actuating rod facing the firing handle; and a stopper , including a stop part, the stop part is at least partly movably provided on one side of the actuating rod provided with the rack, and the stop part can move between the first position area and the second position area. Wherein, when the nail head needs to be closed, the stopper part is located in the first position area. At this time, when the firing handle is operated so that the firing handle rotates in the first direction to drive the nail head to close, the driving member is opposed to the stopper, so that the driving member and the tooth If the rack is separated, the driving member cannot drive the rack to move toward the distal side, and thus the stapler cannot be fired.

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

As shown in FIGS. 1-15 , an embodiment of the present invention provides a driving mechanism for a medical stapler and a medical stapler including the driving mechanism. As shown in FIG. 1 , the stapler also includes a nail head 9 and a stapler body 1 . The nail head 9 is disposed on the distal side of the stapler body 1 . The stapler body 1 includes a housing 13 , and one side of the housing 13 is provided with a fixed handle 11 . The inside of the housing 13 is provided with a connecting rod 18, the inside of the connecting rod 18 is provided with a closing tab 94 for closing the nail head 9, and the distal side of the closing tab 94 is connected to the Nail head 9.

In the present invention, the distal side and the proximal side are relative to the operator, the end closer to the operator is the proximal side, and the end farther away from the operator, that is, the end closer to the surgical site is the far side. End side, the direction along the axis of the stapler is the axial direction, that is, the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. For example, in the viewing angle of FIG. 1 , for the stapler, its distal end side is the left side, and its proximal end side is the right side. The S1 direction in FIG. 1 is the direction from the proximal side to the distal side of the stapler. Define the S1 direction and/or the direction opposite to the S1 direction as the axial direction of the stapler. The S2 direction in FIG. 3 is defined as the longitudinal direction, that is, the height direction. The direction S3 in FIG. 3 is defined as the lateral direction, that is, the width direction.

As shown in FIG. 1 , the nail head 9 includes an anvil 91 and a nail cartridge assembly 92 oppositely arranged, the proximal side of the nail anvil 91 is rotatably connected to the proximal side of the nail cartridge assembly 92, The anvil 91 has an open state and a closed state relative to the staple cartridge assembly 92 . Specifically, the proximal side of the nail anvil 91 is provided with a first matching groove 911, and the proximal side of the nail cartridge assembly 92 is provided with a second matching groove 921 extending axially, and a closing pin 93 is simultaneously installed in the The first fitting groove 911 , the second fitting groove 921 and the distal side of the closing tab 94 ( FIG. 2 ). When the closing tab 94 moves toward the proximal side, the closing pin 93 also moves toward the proximal side, driving the nail anvil 91 to move toward the nail cartridge assembly 92 to close the nail head 9 . When the closing tab 94 moves toward the distal side, the closing pin 93 also moves toward the distal side, driving the nail anvil 91 to move away from the nail cartridge assembly 92 to open the nail head Part 9.

As shown in FIG. 2 , in this embodiment, the driving mechanism includes a firing handle 3 , an actuating rod 2 and a stopper 9 . The firing handle 3 includes a driving member 31, the firing handle 3 is pivotally connected to the housing of the stapler body 1, and can move in a first direction (the direction R1 in FIG. 4 ) relative to the stapler body 1. rotate. A rack 21 is provided on one side of the actuating rod 2 facing the firing handle 3 . The stopper 8 includes a stopper 83, the stopper 83 is at least partly movably disposed on the side of the actuating rod 2 where the rack 21 is disposed, and the stopper 83 can be in the first position area and the second location area. Wherein, when the nail head 9 needs to be closed, the stopper portion 83 is located in the first position area. At this time, the firing handle 3 is operated so that the firing handle 3 rotates along the first direction, and the firing handle 3 drives the closing tab 94 to move toward the proximal side to close the nail head, and at the same time, the driving member 31 abut against the stopper portion 83 so that the driving member 31 is separated from the rack 21, so the driving member 31 cannot drive the rack 21 to move in the direction of the distal end, and the anastomosis cannot be fired. device.

Further, in this embodiment, the stopper portion 83 further includes a second position area, and the second position area is located on the proximal side of the first position area. For example, the stop portion 83 shown in FIG. 4 and FIG. 5 is in the first position area. At this time, the stop portion 83 is located on the side of the distal end of the driving member 31 facing the rack 21, so The side surface of the stop portion 83 facing the firing handle 3 is flush with the side surface of the rack 21 facing the firing handle 3 , or, the stop portion 83 faces the firing handle 3 One side surface of the rack 21 protrudes from the side surface of the firing handle 3 to ensure that the driving member 31 cannot enter between the teeth 212 of the rack 21 due to the stopper effect of the stopper 83 . Can. At this time, the firing handle 3 is operated so that the firing handle 3 rotates in the first direction, and the driving member 31 is opposed to the stopper 83. Due to the stopper effect of the stopper 83, The driving member 31 is separated from the rack 21 and cannot cooperate with the teeth 212 of the rack 21, so the stapler cannot be fired. The stop portion 83 shown in FIG. 14 and FIG. 15 is located in the second position region, and at this time, the stop portion 83 is located at the proximal side of the distal end of the driving member 31 . At this time, when the firing handle 3 is operated so that the firing handle 3 rotates in the first direction, the driving member 31 of the firing handle 3 is no longer stopped by the stopper 83, but can enter into the rack Between the teeth 212 of 21, cooperate with the rack 21, and drive the actuating rod 2 to move toward the distal side of the stapler, so as to realize the firing of the stapler.

As shown in Figures 1 to 3, in this embodiment, the drive mechanism also includes a switch button 7, through which the stopper 83 can be controlled to move in the axial direction, so that the stopper 83 can move in the axial direction. A location transition between the first location area and the second location area. The switching button 7 and the stopper 8 form a switching assembly. The switch button 7 includes a button portion 74 , a first matching portion 71 and a second matching portion 72 . The housing 13 is provided with a button hole 16 , and the button portion 74 of the switch button 7 passes through the button hole 16 and at least partially protrudes outside the housing 13 of the stapler body 1 . Therefore, the switch button 7 is axially fixed to the casing 13 of the stapler body 1 , that is, the switch button 7 will not move axially relative to the stapler body 1 . The stopper 8 also includes a stopper body 81 . When the first matching portion 71 of the switch button 7 is matched with the stopper body 81, the stopper portion 83 is located in the first position area, and the second matching portion 72 of the switch button 7 is matched with the stopper body 81. When the stopper body 81 is mated, the stopper portion 83 is located in the second position area. The specific structure and working mode of the switching component will be introduced in detail below.

The drive mechanism of the present invention can be used in conjunction with various closure mechanisms. In this embodiment, it is described by taking the closing mechanism including the connecting rod assembly 4 and the closing pull rod assembly 5 as an example. It can be understood that the present invention is not limited thereto, and other structures that can realize the closing of the nail head 9 by driving the firing handle 3 can also be used in combination with the driving mechanism of the present invention. As shown in FIG. 4 , in this embodiment, the closing mechanism includes a connecting rod assembly 4 and a closing pull rod assembly 5 , and the connecting rod assembly 4 includes a first rod 41 and a second rod 42 , and the second rod 42 Located on the proximal side of the first rod 41, the first rod 41 includes a first pivot portion 412 and a third pivot portion 413, and the second rod 42 includes a second pivot portion 422 and a fourth pivot portion. Connecting part 423. The first pivotal part 412 is pivotally connected to the housing 13 of the stapler body 1 through the first pin shaft 43, so that the first pivotal part 412 is connected to the housing 13 of the stapler body 1 Relatively fixed in the axial direction. The third pivotal part 413 is pivotally connected to the fourth pivotal part 423 through the second pin shaft 44 , and the second pivotal part 422 is pivotally connected to the closing rod assembly through the third pin shaft 45 5, so that the second pivot portion 422 is relatively fixed in the axial direction with the closing pull rod assembly 5, and the closing pull rod assembly 5 is fixedly connected with the proximal end side of the closing pull piece 94 (FIG. 2), so that The axial movement of the closing pull rod assembly 5 can drive the axial movement of the closing pull piece 94 . The closing rod assembly 5 includes an outer sleeve portion 51 sleeved on the outside of the connecting rod 18 and a second driving portion 52 pivotally connected to the second pivot portion 422 .

In this embodiment, the connecting rod assembly 4 includes a first state and a second state, both of which are relatively balanced states. As shown in Figure 4, in the initial state, the linkage assembly 4 is in the first state, and the linkage assembly 4 is in a relatively compact state, that is, the first pivot joint 412 and the second pivot joint 412 are in a relatively compact state. The axial distance between portions 422 is relatively small. By holding the firing handle 3, the link assembly 4 can be driven from the first state to the second state. As shown in Figures 8 and 9, when the link assembly 4 enters the second state, the link assembly 4 enters a relatively stretched state, and the first pivot portion 412 and the second pivot The axial distance between the connecting parts 422 increases, the second pivoting part 422 drives the closing rod assembly 5 to move toward the proximal side, and the closing rod assembly 5 drives the closing pull piece 94 to the proximal side direction movement to close the nail head 9.

As shown in FIGS. 2 to 9 , the rack 21 is provided with an escape portion 211 on the side facing the firing handle 3 , the stopper portion 83 at least partially enters the avoidance portion 211 , and can be moved relative to the avoidance portion 211 . Part 211 moves in the axial direction. In this embodiment, the escape portion 211 is a groove disposed at the lateral middle of the rack 21 and recessed in a direction away from the firing handle 3 . In another alternative embodiment, the avoidance portion 211 may not be provided, but the stopper portion 83 is arranged on the outer side of the rack 21, so that the stopper portion 83 can be positioned relative to the The rack 21 moves axially.

As shown in Figures 2 to 4, in this embodiment, the stopper body 81 is provided with a chute 811 extending in the axial direction, and the housing 13 of the stapler body 1 is provided with a guide block 17, the The guide block 17 at least partially enters the chute 811 and can move along the extending direction of the chute 811 , so that the stopper body 81 can move axially relative to the housing 13 of the stapler body 1 . movement, and restrict the stopper body 81 from longitudinal movement relative to the housing 13 of the stapler body 1 . The chute 811 includes a first section and a second section, the first section is located at the proximal side of the second section. In the initial state, the guide block 17 is located at the first section of the slide groove 811, and when the stopper 8 moves toward the proximal side, the slide groove 811 moves toward the proximal end relative to the guide block 17. sideways movement, so that the guide block 17 enters the second section of the chute 811 . In another alternative embodiment, the casing 13 of the stapler body 1 may also be provided with a chute extending in the axial direction, and the stopper body 81 may be provided with a guide block, and the guide block is at least partially enters the chute and can move along the extending direction of the chute. The firing handle 3 also includes a first driving part 32 , the driving member 31 is a claw rotatably connected to the firing handle 3 , and the first driving part 32 is connected to the first connecting rod assembly 4 . The rods 41 are oppositely arranged. A handle return spring 15 is disposed between the firing handle 3 and the shell 13 of the stapler body 1. The handle return spring 15 may be, for example, a tension spring, torsion spring, compression spring, etc., but the present invention is not limited thereto. The housing 13 of the stapler body 1 is provided with a support 14 protruding inwardly, the stopper body 81 is arranged at the support 14, and the stopper body 81 can move along the support. 14 moves along the axial direction.

As shown in Figures 4-7, the stopper 8 further includes a connecting arm 82, the stopper body 81 is connected to the stopper part 83 through the connecting arm 82, and the stopper body 81 It can move axially relative to the housing 13 of the stapler body 1 . The stopper body 81 is located on the distal side of the driver 31 . The connecting arm 82 includes a connected first arm 821 and a second arm 822, and the stopper body 81 is connected to the stopper portion 83 through the second arm 822 and the first arm 821 in turn. , the stop portion 83 is a protrusion protruding from the proximal side of the first arm 821 toward the direction of the firing handle 3 . In this embodiment, the second arm 822 extends longitudinally, and the first arm 821 extends axially, but the present invention is not limited thereto, and the connecting arm 82 may also adopt other structures, such as a An arc-shaped connecting arm, or a connecting arm with a slope, etc., as long as the axial movement of the stopper body 81 can drive the axial movement of the stopper part 83 . The stop portion 83 can be integrally provided with the connecting arm 82 , or can be two separately formed parts fixedly connected to each other.

The specific structure and working process of the driving mechanism and the closing mechanism of this embodiment will be described in detail below in conjunction with FIGS. 4-15 . 4-9 show the structure of the driving mechanism and the closing mechanism in the initial state. As shown in FIG. 4 and FIG. 5 , in the initial state, the stopper 83 is in the first position area, and the stopper 83 is located at the far end of the driving member 31 toward a side of the rack 21 . side, the side surface of the stopper 83 facing the firing handle 3 (that is, the lower surface of the stopper 83 in the perspective of FIG. 4 ) and the side of the rack 21 facing the firing handle 3 The side surface (that is, the lower surface of the rack 21 in the perspective of FIG. Describe the side surface of firing handle 3. The distal end of the driving member 31 abuts against the side surface of the stopper 83 facing the firing handle 3 , and under the action of the stopper 83 , the distal end of the driving member 31 cannot into the middle of the teeth 212 of the rack 21 . In this embodiment, the side surface of the stop portion 83 facing the firing handle 3 is a plane parallel to the axial direction.

As shown in FIGS. 5-9 , the switching button 7 includes a first matching portion 71 and a second matching portion 72 , and the switching button 7 is axially fixed to the housing 13 of the stapler body 1 . The axial width of the first matching portion 71 is smaller than the axial width of the second matching portion 72 , and the first matching portion 71 and the second matching portion 72 are arranged laterally. The stopper body 81 includes an accommodating cavity 812, and the accommodating cavity 812 includes a first inner wall and a second inner wall opposite to each other. In the perspective of FIG. 6, the first inner wall of the accommodating cavity 812 is right side inner wall, and the second inner wall is the left inner wall.

As shown in FIGS. 5-9 , the switch button 7 includes a first side and a second side. In the perspective of FIG. 6 , the first side of the switch button 7 is the right side, and the second side is the left side. The second side of the switching button 7 is generally a plane extending in the transverse direction, and the first side of the second matching portion 72 of the switching button 7 faces the proximal side relative to the first side of the first matching portion 71 direction, so that the axial width of the first matching portion 71 is smaller than the axial width of the second matching portion 72 . The switch button 7 at least partly enters the accommodating cavity 812, the first side of the switch button 7 fits with the first inner wall of the accommodating cavity 812, and the second side of the switch button 7 matches with the first inner wall of the accommodating cavity 812. An elastic member is provided between the second inner walls of the accommodating cavity 812, and the elastic member can maintain the state of the switching button 7 so that the stopper 83 stays in the first position area or the second location area. When the first matching portion 71 of the switching button 7 is matched with the first inner wall of the accommodating cavity 812, the elastic member can give the second side of the switching button 7 a biasing force toward the proximal side, so that When no external force is applied, the stop portion 83 stays in the first position area. In this embodiment, the elastic member is a compression spring 84 as an example for illustration, but the present invention is not limited thereto. type of elastic member, or a tension spring set at other positions. The second matching portion 72 and the first matching portion 71 of the switching button 7 are arranged in the transverse direction, so by driving the switching button 7 to move in the transverse direction, different matching portions of the switching button 7 and the stopper can be realized. Body 81 cooperates. In this embodiment, the second matching portion 72 is arranged outside the first matching portion 71, and the button portion 74 is located outside the second matching portion 72. By pressing the button portion 74, you can Controlling the movement of the switching button 7 along the lateral direction is realized. Specifically, when the first mating portion 71 of the switch button 7 is mated with the first inner wall of the accommodating cavity 812 , the guide block 17 is located at the first section of the slide groove 811 . By pressing the button part 74, the switch button 7 moves laterally until the second matching part 72 of the switch button 7 is engaged with the first inner wall of the accommodating cavity 812, and the switch button 7 drives the The stopper 8 moves in the proximal direction, so that the stopper 83 of the stopper 8 enters the second position area.

As shown in FIG. 8 and FIG. 9 , in this embodiment, the first side of the switch button 7 is provided with a guide surface 731, and the guide surface 731 is connected to the first side of the first matching portion 71 and the first side of the first matching portion 71. Between the first side of the second matching portion 72, the guide surface 731 is an inclined surface for transition between the first matching portion 71 and the second matching portion 72, so that the stopper body 81 faces the It is smoother when moving in the proximal direction. A portion provided with a guiding surface 731 between the first matching portion 71 and the second matching portion 72 is defined as a connecting portion 73 . In this embodiment, the switch button 7 is provided with a first fitting portion 71, two second fitting portions 72 and two button portions 74, and the two second fitting portions 72 are arranged on the first fitting portion. Two button parts 74 are respectively arranged on the outer sides of the two second matching parts 72 on both sides of the part 71 in the transverse direction, and the switching button 7 is symmetrical to the center line of the first matching part 71 . In another alternative embodiment, only one second matching portion 72 may be provided.

In the state of FIG. 4 , the stopper 83 is located in the first position area, and the operator holds the firing handle 3 so that when the firing handle 3 rotates in the first direction, the handle return spring 15 is elastically deformed. , the distal end of the driving member 31 abuts against the stop portion 83 and moves along the lower surface of the stop portion 83 without driving the rack 21 to move. During this process, the first driving part 32 of the firing handle 3 drives the first rod 41 of the link assembly 4 to rotate counterclockwise around the first pivot part 412, and the second rod 42 rotates clockwise to enter To the state of FIG. 10 , that is, the connecting rod assembly 4 enters into the second state. The second pivoting part 422 moves toward the proximal side, and then drives the second driving part 52 of the closing rod assembly 5 to move toward the proximal side, and the outer sleeve part 51 of the closing rod assembly 5 drives the closing tab 94 moves to the proximal direction, and the nail head 9 is closed. At this time, the connecting rod assembly 4 is in a relatively stable second state. Even if the operator releases the firing handle 3, the firing handle 3 will rotate in the direction of R2 in FIG. 10 under the force of the handle return spring 15 and return to the initial position. , the link assembly 4 can still remain in the second state, and the closing rod assembly 5 remains at the position where the nail head 9 is closed, that is, the stapler enters the state shown in FIG. 11 . As shown in FIG. 11 , at this moment, the distal end of the driving member 31 is still against the stop portion 83 and cannot enter between the teeth 212 of the rack 21 . Even hold the firing handle 3 again at this moment, the stapler cannot be fired.

As shown in Figures 12 and 13, after the nail head 9 of the stapler is closed, the operator presses the button part 74, so that the switch button 7 moves laterally, and under the guidance of the guide surface 731, the switch button 7 7 moves laterally relative to the stopper body 81 , so that the first side of the second matching portion 72 of the switch button 7 fits with the first inner wall of the accommodating cavity 812 of the stopper body 81 . Under the driving action of the switching button 7, the stopper body 81 moves toward the proximal side, and the slide groove 811 moves toward the proximal side relative to the guide block 17 of the housing 13, and the The guide block 17 enters the second section of the slide groove 811 . The stopper body 81 drives the stopper 83 to move proximally through the connecting arm 82, so that the stopper 83 moves to the second position area, that is, as shown in FIGS. 14 and 15 . The location area where the stop 83 is shown is shown. At the same time, as shown in Figures 12-14, when the stopper 83 is in the second position area, the stopper body 81 and the switch button 7 compress the compression spring 84, so that the compression spring 84 produces elastic deformation, The compression spring 84 gives the switching button 7 a biasing force toward the proximal side, under the action of the biasing force, the second matching portion 72 of the switching button 7 can be kept in contact with the accommodating cavity. The tight fit between the first inner walls of 812 keeps said stop 83 in the second position area. As shown in FIG. 14 and FIG. 15 , when the stopper 83 is located in the second position area, the stopper 83 is located at the proximal side of the driving member 31 and no longer blocks the movement of the driving member 31 . The distal end, the distal end of the driving member 31 at least partially enters between the teeth 212 of the rack 21 . The proximal side of the first arm 821 of the stopper 8 also at least partially enters the escape portion 211 , and the proximal side of the first arm 821 facing the side surface of the firing handle 3 does not protrude beyond the The side surface of the rack 21 facing the firing handle 3 will not block the distal end of the driving member 31 from entering between the teeth 212 of the rack 21 . Therefore, in the state of FIG. 15 , when the firing handle 3 is held again to rotate in the direction R1 in FIG. The stapler moves in the direction of the distal end, and the rack 21 drives the entire actuating rod 2 to move in the direction of the distal end, thereby firing the stapler.

After the firing of the stapler is completed, the switching assembly is in the state shown in FIG. Next, when the switching button 7 is pressed and moves laterally until the first matching portion 71 is matched with the first inner wall of the accommodating cavity 812, the switching assembly returns to the state shown in FIG. 9 again, that is, the stopper body 81 The stopper body 81 drives the stopper 83 to move in the distal direction through the connecting arm 82 until the stopper 83 is located on the side of the driving member 31 facing the rack 21 again. , and the driving member 31 abuts against the lower surface of the stop portion 83 .

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

Claims

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

a firing handle, including a drive member, the firing handle is rotatable in a first direction;

an actuating rod, the actuating rod is provided with a rack on one side facing the firing handle;

The stopper includes a stopper part, the stopper part is at least partly movably provided on the side of the actuating rod provided with the rack, and the stopper part can be between the first position area and the second position area move;

Wherein, the stop part is located in the first position area, and when the firing handle rotates along the first direction, the driving part is opposed to the stop part, so that the driving part does not drive The rack moves.
The driving mechanism according to claim 1, wherein the stopper protrudes at least partially from the outside of the rack and can move axially relative to the rack, or the rack moves toward the One side of the firing handle is provided with a avoidance part, and the stopper part at least partially enters the avoidance part, and can move axially relative to the avoidance part.
The driving mechanism according to claim 2, wherein the evacuation portion is a groove disposed at a lateral middle portion of the rack and recessed in a direction away from the firing handle.
The driving mechanism according to claim 2, characterized in that, the side surface of the stopper facing the firing handle is flush with the side surface of the rack facing the firing handle, or, the A side surface of the stopper facing the firing handle protrudes from a side surface of the rack facing the firing handle.
The driving mechanism according to claim 4, wherein the stopper is located in the second position area, and when the firing handle rotates in the first direction, the driving part of the firing handle and the firing handle Cooperate with the rack to drive the actuating rod to move toward the distal side of the stapler.
The driving mechanism according to claim 5, wherein the first position area is located on the distal side of the second position area, and when the stopper is located in the first position area, the stopper The stopper part is located on the side of the distal end of the drive member facing the rack, and when the stopper part is located in the second position area, the stopper part is located on the proximal side of the distal end of the drive member.
The driving mechanism according to claim 6, wherein the stopper further comprises a stopper body and a connecting arm, and the stopper body is connected to the stopper through the connecting arm, so that The stopper body can move axially relative to the housing of the stapler.
The driving mechanism according to claim 7, wherein one of the stopper body and the shell of the stapler is provided with a chute extending in the axial direction, and the other is provided with a guide block;

The guide block at least partially enters the chute and can move along the extending direction of the chute.
The driving mechanism according to claim 7, further comprising a switching button, the switching button includes a first matching portion and a second matching portion, and the switching button is axially fixed to the shell of the stapler;

When the first fitting part of the switching button is matched with the stopper body, the stopper part is located in the first position area, and when the second matching part of the switching button is matched with the stopper body , the stopper is located in the second position area.
The driving mechanism according to claim 9, wherein the axial width of the first matching portion is smaller than the axial width of the second matching portion, and the first matching portion and the second matching portion The matching parts are arranged in the transverse direction.
The driving mechanism according to claim 10, wherein the stopper body includes a housing chamber, the housing chamber includes a first inner wall and a second inner wall oppositely arranged, and the switch button includes a first side and the second side;

The switching button at least partially enters the accommodating cavity, and the first side of the switching button fits with the first inner wall of the accommodating cavity.
The driving mechanism according to claim 11, wherein an elastic member is provided between the second side of the switching button and the second inner wall of the accommodating cavity, and the elastic member is configured to give the switching button a A biasing force is applied toward the first side wall of the accommodating cavity.
The driving mechanism according to claim 11, wherein the second side of the switching button is a plane extending in the transverse direction as a whole, and the first side of the second fitting part of the switching button is opposite to the first The first side of the fitting portion protrudes toward the proximal direction.
The driving mechanism according to claim 13, wherein the first side of the switch button is provided with a guide surface, and the guide surface is connected to the first side of the first matching portion and the second matching portion between the first side of the .
The driving mechanism according to claim 10, wherein the switch button is provided with a first matching portion and two second matching portions, and the two second matching portions are arranged along the first matching portion. horizontal sides.
The driving mechanism according to claim 10, wherein the second matching portion is disposed outside the first matching portion, and the switch button further includes a button portion located outside the second matching portion, The button portion is at least partially exposed outside the shell of the stapler.
The driving mechanism according to claim 10, wherein the shell of the stapler is provided with a support protruding inwardly, the stopper body is arranged at the support, and the stopper The body can move axially along the support.
The driving mechanism according to claim 7, wherein the stopper body is located at the distal end side of the driver, the connecting arm includes a first arm and a second arm connected, and the stopper The component body is sequentially connected to the stop part through the second arm and the first arm, and the stop part is arranged on the proximal side of the first arm.
The driving mechanism according to claim 18, wherein the second arm extends longitudinally, the first arm extends axially, and the stopper is directed from the proximal side of the first arm toward A bump protruding in the direction of the firing handle.
The drive mechanism of claim 19, wherein the proximal side of the first arm at least partially enters the escape portion, and the proximal side of the first arm faces toward a side of the firing handle The surface does not protrude from the side surface of the rack facing the firing handle.
The driving mechanism according to claim 1, characterized in that, the side surface of the stop portion facing the firing handle is a plane parallel to the axial direction.
A medical stapler, characterized by comprising the driving mechanism described in any one of claims 1-21.