CN116262058A - Driving mechanism and medical anastomat - Google Patents

Abstract

The invention provides a driving mechanism and a medical anastomat, wherein the driving mechanism comprises: a firing handle comprising a drive member, the firing handle rotatable in a first direction; an actuating rod, wherein a rack is arranged on one side of the actuating rod facing the firing handle; the stop piece comprises a stop part, wherein the stop part is at least partially movably arranged on one side of the actuating rod, on which the rack is arranged, and can move between a first position area and a second position area; the stop part is positioned in the first position area, and when the firing handle rotates along the first direction, the driving piece abuts against the stop part, so that the driving piece does not drive the rack to move. According to the invention, the stop piece is arranged, when the firing handle is held to be closed, the driving piece of the firing handle is not matched with the rack due to the stop effect of the stop piece, and the rack is not driven to move to the far end side, so that the anastomat cannot be fired.

Description

Driving mechanism and medical anastomat

Technical Field

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

Background

The medical anastomat comprises a medical anastomat body, a firing handle movably connected with the medical anastomat body and a nail head matched with the medical anastomat body. The nail head comprises a nail bin assembly and a nail anvil which are oppositely arranged. During operation, an operator firstly holds the firing handle, and pulls the closing pulling piece to move towards the proximal side of the anastomat through the closing switching mechanism, so that the nail bin assembly and the nail anvil are closed, namely the nail head is closed. Then, the operator holds the firing handle again, the anastomat can be pushed to move towards the tissue, the tissue is anastomosed through the forming of the anastomat in the nail bin assembly at the nail anvil, and meanwhile, the cutter moves towards the distal end side to cut the tissue, so that the firing of the anastomat is realized.

However, in prior art staplers, both controlling the closing of the head and firing the stapler is accomplished by the operator grasping the firing handle. In the process of controlling the closing of the head part of the nail through the firing handle, the firing driving mechanism of the anastomat is expected to be stably kept at the initial position and the initial state so as to avoid the false firing of the anastomat when the head part is closed.

In the present invention, the distal end side and the proximal end side are the proximal end side with respect to the operator, and the end closer to the operator, that is, the end closer to the surgical site is the distal end side.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a driving mechanism and a medical anastomat, when the head of a nail is closed by holding a firing handle, the firing handle can not fire the anastomat due to the action of a stopping part.

The embodiment of the invention provides a driving mechanism for a medical anastomat, which comprises:

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

an actuating rod, wherein a rack is arranged on one side of the actuating rod facing the firing handle;

the stop piece comprises a stop part, wherein the stop part is at least partially movably arranged on one side of the actuating rod, on which the rack is arranged, and can move between a first position area and a second position area;

the stop part is positioned in the first position area, and when the firing handle rotates along the first direction, the driving piece abuts against the stop part, so that the driving piece does not drive the rack to move.

In some embodiments, the stop portion protrudes at least partially outside the rack and is axially movable relative to the rack, or a side of the rack facing the firing handle is provided with a relief portion, and the stop portion at least partially enters the relief portion and is axially movable relative to the relief portion.

In some embodiments, the relief is a recess disposed in a middle of the rack that is recessed in a direction away from the firing handle.

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

In some embodiments, the first location area is located on a distal side of the second location area, the stop is located on a side of the distal end of the driver facing the rack when the stop is located in the first location area, and the stop is located on a proximal side of the distal end of the driver when the stop is located in the second location area;

the stop part is positioned in the second position area, and when the firing handle rotates along the first direction, the driving piece of the firing handle is matched with the rack so as to drive the actuating rod to move towards the distal end side of the anastomat.

In some embodiments, the stop further comprises a stop body and a connecting arm, the stop body being connected to the stop by the connecting arm, the stop body being axially movable relative to the housing of the stapler body.

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

the guide block at least partially enters the sliding groove and can move along the extending direction of the sliding groove.

In some embodiments, the stapler further comprises a switch button comprising a first mating portion and a second mating portion, the switch button being axially fixed with the housing of the stapler body;

when the first matching part of the switching button is matched with the stop piece body, the stop part is positioned in the first position area, and when the second matching part of the switching button is matched with the stop piece body, the stop part is positioned in the second position area.

In some embodiments, the first mating portion has a smaller width in the axial direction than the second mating portion, and the first mating portion and the second mating portion are arranged in the lateral direction;

the first matching part of the switching button is matched with the stop piece body, and when the switching button moves transversely until the second matching part of the switching button is matched with the stop piece body, the switching button drives the stop piece to move towards the proximal side direction, so that the stop part of the stop piece enters the second position area.

In some embodiments, the stopper body includes a receiving cavity including oppositely disposed first and second inner walls, the switch knob including first and second sides;

the switching button at least partially enters the accommodating cavity, and the first side of the switching button is matched 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 makes the stop portion stay in the first position area or the second position area.

In some embodiments, the second side of the switch knob is generally a plane extending in a lateral direction, and the first side of the second mating portion of the switch knob protrudes in a proximal direction relative to the first side of the first mating portion.

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

In some embodiments, the switch button is provided with a first mating portion and two second mating portions, and the two second mating portions are disposed on two sides of the first mating portion in the transverse direction.

In some embodiments, the second mating portion is disposed outside the first mating portion, and the switch button further includes a button portion located outside the second mating portion, the button portion being at least partially exposed outside the housing of the stapler.

In some embodiments, the housing of the stapler body is provided with an inwardly protruding support, the stop body is provided at the support, and the stop body is axially movable along the support.

In some embodiments, the stopper body is located at a distal end side of the driver, the connection arm includes a first arm and a second arm connected, the stopper body is connected with the stopper portion sequentially through the second arm and the first arm, and the stopper portion is disposed at a proximal end side of the second arm.

In some embodiments, the second arm extends longitudinally and the first arm extends axially, and the stop is a tab protruding from a proximal side of the first arm in a direction toward the firing handle.

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

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

The embodiment of the invention also provides a medical anastomat, which comprises the driving mechanism.

The driving mechanism and the medical anastomat provided by the invention have the following advantages:

the invention provides a driving mechanism for a medical anastomat, which is provided with a stop piece, when a firing handle is held to be closed, the driving piece of the firing handle is not matched with a rack due to the stop effect of the stop piece, and the rack is not driven to move to the far end side, so that the anastomat cannot be fired, and the safety and the effectiveness of the anastomat in use are improved.

Drawings

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

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

FIG. 2 is a schematic view of a stapler body according to an embodiment of the invention with one side housing removed;

FIG. 3 is a schematic view illustrating the configuration of the housing and the switching assembly in an initial state according to an embodiment of the present invention;

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

FIG. 5 is a schematic view of the switching assembly cooperating with the actuating lever, with the stop in a first position area, according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a switching assembly according to an embodiment of the present invention;

FIG. 7 is a schematic view of a stop cooperating with an actuator lever in accordance with an embodiment of the present invention;

FIG. 8 is a schematic structural view of a switching assembly according to an embodiment of the present invention, wherein a stop portion is located in a first position area;

FIG. 9 is a schematic diagram showing the structure of a switch button according to an embodiment of the present invention;

FIG. 10 is a schematic view of the drive assembly when holding the firing handle according to one embodiment of the present invention;

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

FIG. 12 is a schematic view of a switch assembly according to an embodiment of the present invention, wherein the stopper is located in the second position area;

FIG. 13 is a schematic view showing a switch assembly and a housing in cooperation with each other according to an embodiment of the present invention;

FIG. 14 is a schematic view of the pawl of the firing handle engaged with a stop in a second position area according to an embodiment of the present invention;

fig. 15 is a schematic structural view of a driving assembly according to an embodiment of the invention, where the stop portion is located in the second position area.

Reference numerals:

1. third pin shaft of anastomat body 45

11. Fixed handle 5 closing pull rod assembly

13. Casing 51 jacket part

14. Second driving part of supporting piece 52

15. Handle reset spring 7 switch button

16. First mating portion of button hole 71

17. Second mating portion of guide block 72

18. Connecting rod 73 connecting part

2. Actuating rod 731 guide surface

21. Rack 74 button part

211. Avoidance 8 stop

212. Tooth 81 stopper body

3. Trigger handle 811 chute

31. Driving piece 812 accommodating cavity

32. First drive portion 82 connecting arm

4. First arm of connecting rod assembly 821

41. First lever 822 second arm

412. First pivot portion 83 stop portion

413. Third pivot 84 compression spring

42. Head of second rod 9

422. Second pin joint 91 nail anvil

423. First matching groove of fourth pivot part 911

43. First pin 92 cartridge assembly

44. Second pin 921 second mating groove

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can 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 the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.

The invention provides a driving mechanism for a medical anastomat and the medical anastomat comprising the driving mechanism. The anastomat further comprises a nail head part and an anastomat body, wherein the nail head part is arranged on the far end side of the anastomat body. The driving mechanism includes: a firing handle comprising a drive member, the firing handle rotatable in a first direction; an actuating rod, wherein a rack is arranged on one side of the actuating rod facing the firing handle; and the stop piece comprises a stop part, wherein the stop part is at least partially movably arranged on one side of the actuating rod, on which the rack is arranged, and can move between a first position area and a second position area. Wherein the stop is located in the first location area when the head needs to be closed. At this time, the firing handle is operated to rotate along the first direction, the driving piece abuts against the stop portion, so that the driving piece is separated from the rack, and the driving piece does not drive the rack to move, so that the driving piece cannot drive the rack to move towards the distal direction, and the anastomat cannot be fired.

The following describes the structure of the driving mechanism of each embodiment of the present invention in detail with reference to the accompanying drawings, and it is to be understood that each embodiment is not a limitation of the protection scope of the present invention.

As shown in fig. 1 to 15, an embodiment of the present invention provides a closure switching mechanism for a medical stapler and a medical stapler including the closure switching mechanism. As shown in fig. 1, the anastomat further comprises a nail head 9, an anastomat body 1 and a firing handle 3, wherein the firing handle 3 is movably connected with the anastomat body 1, and the nail head 9 is arranged at the far end side of the anastomat body 1. The anastomat body 1 comprises a shell 13, and a fixed handle 11 is arranged on one side of the shell 13. 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 (not shown in the figure) for closing the nail head 9, and the distal end side of the closing tab is connected to the nail head 9.

In the present invention, the distal end side and the proximal end side are the proximal end side with respect to the operator, the end closer to the operator, the end farther from the operator, i.e., the end closer to the operation position, are the distal end sides, and the direction along the axis of the stapler is the axial direction, i.e., the direction from the distal end side to the proximal end side of the stapler, or the direction from the proximal end side to the distal end side of the stapler. For example, in the view of fig. 1, the distal side is the left side and the proximal side is the right side for the stapler. The direction S1 in fig. 1 is the direction from the proximal side to the distal side of the stapler. The direction S1 and/or the direction opposite to the direction S1 are defined as the axial direction of the anastomat. The S2 direction in fig. 3 is defined as the longitudinal direction, i.e., the height direction. The S3 direction in fig. 3 is defined as the lateral direction, i.e., the width direction.

As shown in fig. 1, the nail head 9 includes a nail anvil 91 and a cartridge assembly 92 disposed opposite to each other, and a proximal end side of the nail anvil 91 is rotatably connected with a proximal end side of the cartridge assembly 92 such that the nail anvil 91 has an open state and a closed state with respect to the cartridge assembly 92. Specifically, the proximal side of the anvil 91 is provided with a first mating groove 911, the proximal side of the cartridge assembly 92 is provided with an axially extending second mating groove 921, and a closure pin is simultaneously threaded through the first mating groove 911, the second mating groove 921 and the distal side of the closure tab. When the closing tab moves in the proximal direction, the closing pin also moves in the proximal direction, driving the anvil 91 to move toward the cartridge assembly 92 to close the nail head 9. When the closing tab moves in the distal direction, the closing pin also moves in the distal direction, driving the anvil 91 to move away from the cartridge assembly 92 to open the nail head 9.

In this embodiment, as shown in fig. 2, the drive mechanism includes a firing handle 3, a brake 2, and a stop 9. The firing handle 3 includes a drive member 31, the firing handle 3 being pivotally connected to the housing of the stapling body 1, rotatable in a first direction relative to the stapling body 1. The side of the actuating rod 2 facing the firing handle 3 is provided with a rack 21. The stop member 8 comprises a stop portion 83, the stop portion 83 is at least partially movably arranged on the side of the actuating rod 2 where the rack 21 is arranged, and the stop portion 83 is movable between a first position area and a second position area. Wherein the stop 83 is located in the first position area when it is desired to close the head 9. At this time, the firing handle 3 is operated to rotate the firing handle 3 in the first direction, and the driving member 31 abuts against the stop portion 83, so that the driving member 31 is separated from the rack 21, and therefore, the driving member 31 cannot drive the rack 21 to move in the distal direction, and the stapler cannot be fired.

Further, in this embodiment, the stop 83 further includes a second location area located on the proximal side of the first location area. For example, the stop 83 shown in fig. 4 and 5 is in the first position area, when the stop 83 is located in the first position area, the stop 83 is located on a side of the distal end of the driving member 31 facing the rack 21, a side surface of the stop 83 facing the firing handle 3 is flush with a side surface of the rack 21 facing the firing handle 3, or a side surface of the stop 83 facing the firing handle 3 protrudes from a side surface of the rack 21 facing the firing handle 3, so that the driving member 31 cannot enter between the teeth 212 of the rack 21 due to the stopping action of the stop 83. At this time, the firing handle 3 is operated to rotate the firing handle 3 in the first direction, the driving member 31 abuts against the stop portion 83, and the driving member 31 is separated from the rack 21 due to the stop action of the stop portion 83, and cannot cooperate with the teeth 212 of the rack 21, so that the stapler cannot be fired. The stop 83 shown in fig. 14 and 15 is located in the second position area, where the stop 83 is located on the proximal side of the distal end of the driver 31. When the firing handle 3 is operated at this time to rotate the firing handle 3 in the first direction, the driving member 31 of the firing handle 3 is not stopped by the stopping portion 83, but can enter between the teeth 212 of the rack 21, cooperate with the rack 21, and drive the actuating rod 2 to move towards the distal end side of the stapler, so as to realize firing of the stapler.

As shown in fig. 1 to 3, in this embodiment, the driving mechanism further includes a switch button 7, and the switch button 7 can control the stopper 83 to move in the axial direction, so as to switch the position of the stopper 83 between the first position area and the second position area. The switch button 7 and the stop 8 constitute a switch assembly. The switch button 7 includes a button portion 74, a first engagement portion 71, and a second engagement portion 72. The housing 13 is provided with a button hole 16, and the button portion 74 of the switch button 7 is arranged in the button hole 16 and at least partially protrudes out of the housing 13 of the stapler body 1, so that the switch button 7 is axially fixed with the housing 13 of the stapler body 1, i.e. the switch button 7 does not move axially relative to the stapler body 1. When the first engaging portion 71 of the switch button 7 is engaged with the stopper body 81, the stopper 83 is located in the first position area, and when the second engaging portion 72 of the switch button 7 is engaged with the stopper body 81, the stopper 83 is located in the second position area. The specific structure and operation of the switching assembly will be described in detail below.

The drive mechanism of the present invention may be used in conjunction with a variety of closure mechanisms. In this embodiment, the closing mechanism is described by taking as an example that the closing mechanism includes a link assembly 4 and a closing lever assembly 5. It will be appreciated that the present invention is not limited in this regard and that other arrangements for effecting closure of the staple head 9 using actuation of the firing handle 3 may be used in conjunction with the drive mechanism of the present invention. As shown in fig. 4, in this embodiment, the closing mechanism includes a link assembly 4 and a closing link assembly 5, the link assembly 4 includes a first lever 41 and a second lever 42, the second lever 42 is located at a proximal end side of the first lever 41, the first lever 41 includes a first pivot portion 412 and a third pivot portion 413, and the second lever 42 includes a second pivot portion 422 and a fourth pivot portion 423. The first pivot portion 412 is pivotally connected to the housing 13 of the stapler body 1 through the first pin 43, so that the first pivot portion 412 and the housing 13 of the stapler body 1 are relatively fixed in the axial direction. The third pivot portion 413 is pivotally connected to the fourth pivot portion 423 through the second pin shaft 44, and the second pivot portion 422 is pivotally connected to the closing pull rod assembly 5 through the third pin shaft 45, so that the second pivot portion 422 and the closing pull rod assembly 5 are relatively fixed in an axial direction, and the closing pull rod assembly 5 is fixedly connected to a proximal end side of the closing pull piece, so that axial movement of the closing pull rod assembly 5 can drive axial movement of the closing pull piece. The closing rod assembly 5 includes an outer sleeve portion 51 sleeved outside the connecting rod 18 and a second driving portion 52 pivotally connected to the second pivot portion 422.

In this embodiment, the linkage assembly 4 includes a first state and a second state, both of which are relatively balanced. As shown in fig. 4, in the initial state, the link assembly 4 is in the first state, and the link assembly 4 is in a relatively compact state, i.e., the axial distance between the first pivot portion 412 and the second pivot portion 422 is small. By grasping the firing handle 3, the linkage assembly 4 can be driven from the first state to the second state. As shown in fig. 8 and 9, when the link assembly 4 is in the second state, the link assembly 4 is in a relatively stretched state, the axial distance between the first pivot portion 412 and the second pivot portion 422 increases, the second pivot portion 422 drives the closing pull rod assembly 5 to move in the proximal direction, and the closing pull rod assembly 5 drives the closing pull sheet to move in the proximal direction to close the pin head 9.

The specific construction and operation of the drive mechanism and closure mechanism of this embodiment will be described in detail with reference to fig. 2-15. Fig. 2 to 9 show the structures of the driving mechanism and the closing mechanism in the initial state. In this embodiment, a relief portion 211 is disposed on a side of the rack 21 facing the firing handle 3, and the stop portion 83 at least partially enters the relief portion 211 and is axially movable relative to the relief portion 211. In this embodiment, the avoidance portion 211 is a recess provided in the middle of the rack 21 and recessed in a direction away from the firing handle 3. In a further alternative embodiment, the stop 83 may also be arranged outside the toothed rack 21, such that the stop 83 is axially movable relative to the toothed rack 21.

As shown in fig. 2 to 4, in this embodiment, the stopper body 81 is provided with a slide groove 811 extending in the axial direction, the housing 13 of the stapler body 1 is provided with a guide block 17, and the guide block 17 at least partially enters the slide groove 811 and is movable in the extending direction of the slide groove 811, thereby realizing that the stopper body 81 is movable in the axial direction with respect to the housing 13 of the stapler body 1 and restricting the stopper body 81 from moving longitudinally with respect to the housing 13 of the stapler body 1. The runner 811 includes a first segment and a second segment, the first segment being located on a proximal side of the second segment. In the initial state, the guide block 17 is positioned at a first section of the slide groove 811, and when the stopper 8 moves in the proximal direction, the slide groove 811 moves in the proximal direction with respect to the guide block 17, so that the guide block 17 enters a second section of the slide groove 811. In a further alternative embodiment, it is also possible that the housing 13 of the stapler body 1 is provided with an axially extending slide groove, and the stop body 81 is provided with a guide block which at least partially enters the slide groove and is movable in the direction of extension of the slide groove. The firing handle 3 includes a driving member 31 and a first driving portion 32, the driving member 31 is a jaw rotatably connected to the firing handle 3, and the first driving portion 32 is disposed opposite to the first rod 41 of the link assembly 4. A handle return spring 15 is arranged between the firing handle 3 and the housing 13 of the stapler body 1, and the handle return spring 15 may be, for example, a tension spring, but the invention is not limited thereto. The housing 13 of the stapler body 1 is provided with a support 14 protruding to the inside, the stopper body 81 is provided at the support 14, and the stopper body 81 is movable in the axial direction along the support 14.

As shown in fig. 4 to 7, the stopper 8 further includes a stopper body 81 and a connecting arm 82, the stopper body 81 is connected to the stopper 83 by the connecting arm 82, and the stopper body 81 is movable in an axial direction with respect to the housing 13 of the stapler body 1. The stopper body 81 is located at the distal end side of the driver 31. The connecting arm 82 includes a first arm 821 and a second arm 822 that are connected, and the stopper body 81 is connected to the stopper 83 sequentially through the second arm 822 and the first arm 821, and the stopper 83 is a projection protruding from the proximal end side of the first arm 821 toward the direction of the firing handle 3. In this embodiment, the second arm 822 extends in the longitudinal direction and the first arm 821 extends in the axial direction, but the present invention is not limited thereto, and the connecting arm 82 may have other structures, as long as the axial movement of the stopper body 81 is achieved so as to drive the stopper 83 to move in the axial direction. The stop 83 may be integrally provided with the connecting arm 82, or may be two pieces that are separately molded and then fixedly connected to each other.

As shown in fig. 4 and 5, in the initial state, the stop 83 is located in the first position area, the stop 83 is located on a side of the distal end of the driving member 31 facing the rack 21, a side surface of the stop 83 facing the firing handle 3 (i.e., a lower surface of the stop 83 in the view of fig. 4) is flush with a side surface of the rack 21 facing the firing handle 3 (i.e., a lower surface of the rack 21 in the view of fig. 4), or a side surface of the stop 83 facing the firing handle 3 protrudes from a side surface of the rack 21 facing the firing handle 3. The distal end of the driving member 31 abuts against a side surface of the stop portion 83 facing the firing handle 3, and the distal end of the driving member 31 cannot enter into the middle of the teeth 212 of the rack 21 under the stop action of the stop portion 83. In this embodiment, the side surface of the stop 83 facing the firing handle 3 is a plane parallel to the axial direction.

As shown in fig. 5 to 9, the switch button 7 includes a first engaging portion 71 and a second engaging portion 72, and the switch button 7 is axially fixed to the housing 13 of the stapler body 1. The width of the first mating portion 71 in the axial direction is smaller than the width of the second mating portion 72 in the axial direction, and the first mating portion 71 and the second mating portion 72 are arranged in the lateral direction. The stopper body 81 includes a receiving cavity 812, the receiving cavity 812 includes a first inner wall and a second inner wall disposed opposite to each other, and in the view of fig. 6, the first inner wall of the receiving cavity 812 is a right inner wall, and the second inner wall is a left inner wall.

As shown in fig. 5 to 9, the switch button 7 includes a first side and a second side, and the first side of the switch button 7 is a right side and the second side is a left side in the view of fig. 6. The second side of the switch button 7 is a plane extending in a transverse direction, and the first side of the second mating portion 72 of the switch button 7 protrudes in a proximal direction with respect to the first side of the first mating portion 71, so that the width of the first mating portion 71 in the axial direction is smaller than the width of the second mating portion 72 in the axial direction. The switch button 7 at least partially enters the accommodating cavity 812, a first side of the switch button 7 is matched with a first inner wall of the accommodating cavity 812, and an elastic member is arranged between a second side of the switch button 7 and a second inner wall of the accommodating cavity 812, and the elastic member can keep the state of the switch button 7 to enable the stop part 83 to stay in the first position area or the second position area. When the first engaging portion 71 of the switch button 7 engages with the first inner wall of the accommodating cavity 812, the elastic member may apply a biasing force to the second side of the switch button 7, so that the stop portion 83 stays in the first position area when no external force is applied. In this embodiment, the elastic member is taken as an example of the pressure spring 84, but the present invention is not limited thereto, and in other alternative embodiments, the elastic member may be another type of elastic member such as a spring plate or an elastic block, or a tension spring provided at another position. The second engaging portion 72 and the first engaging portion 71 of the switch knob 7 are arranged in the lateral direction, so that by driving the switch knob 7 in the lateral direction, it is possible to achieve engagement of the different engaging portions of the switch knob 7 with the stopper body 81. In this embodiment, the second engaging portion 72 is disposed outside the first engaging portion 71, and the button portion 74 is located outside the second engaging portion 72, and by pressing the button portion 74, it is possible to control the movement of the switch button 7 in the lateral direction. Specifically, when the first engaging portion 71 of the switch button 7 engages with the first inner wall of the accommodating cavity 812, the guide block 17 is located at the first section of the sliding groove 811. By pressing the push button 74, the switch button 7 is moved in the lateral direction until the second engaging portion 72 of the switch button 7 engages with the first inner wall of the accommodating chamber 812, and the switch button 7 drives the stopper 8 to move in the proximal direction, so that the stopper 83 of the stopper 8 enters the second position area.

As shown in fig. 8 and 9, in this embodiment, the first side of the switch button 7 is provided with a guide surface 731, the guide surface 731 is connected between the first side of the first mating portion 71 and the first side of the second mating portion 72, the guide surface 731 is a slope for transition between the first mating portion 71 and the second mating portion 72, and a portion between the first mating portion 71 and the second mating portion 72 where the guide surface 731 is provided is defined as the connecting portion 73. So that the stopper body 81 moves more smoothly in the proximal-side direction. In this embodiment, the switch button 7 is provided with one first engaging portion 71, two second engaging portions 72, and two push button portions 74, the two second engaging portions 72 are disposed on both sides of the first engaging portion 71 in the lateral direction, the two push button portions 74 are disposed on the outer sides of the two second engaging portions 72, respectively, and the switch button 7 is symmetrical with respect to the center line of the first engaging portion 71. In a further alternative embodiment, only one second mating portion 72 may be provided.

In the state of fig. 4, the stop 83 is located in the first position area, and when the operator holds the firing handle 3, such that the firing handle 3 rotates in the first direction (R1 direction in fig. 4), the handle return spring 15 is elastically deformed, and the distal end of the driver 31 abuts against the stop 83 and moves along the lower surface of the stop 83, without driving the rack 21 to move. In 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 pivoting part 412, and the second rod 42 rotates clockwise, so that the state of fig. 10 is reached, that is, the link assembly 4 is brought into the second state. The second pivot portion 422 moves in the proximal direction, so as to drive the second driving portion 52 of the closing rod assembly 5 to move in the proximal direction, and the outer sleeve portion 51 of the closing rod assembly 5 drives the closing tab to move in the proximal direction, so as to close the nail head 9. At this time, the link assembly 4 is in the relatively stable second state, and even if the operator releases the firing handle 3, the firing handle 3 is rotated in the direction R2 in fig. 10 by the force of the handle return spring 15 to return to the initial position, the link assembly 4 can be maintained in the second state, and the closing lever assembly 5 is maintained at the position where the nail head 9 is closed, i.e., the stapler is brought into the state shown in fig. 11. At this time, as shown in fig. 11, the distal end of the driving member 31 still abuts against the stop portion 83, and cannot enter between the teeth 212 of the rack 21. Even if the firing handle 3 is held again at this time, the stapler cannot be fired.

As shown in fig. 12 and 13, after the closing of the nail head 9 of the stapler, the operator presses the button 74, which causes the switch button 7 to move laterally, under the guiding action of the guiding surface 731, the switch button 7 moves laterally with respect to the stopper body 81, so that the first side of the second engaging portion 72 of the switch button 7 engages with the first inner wall of the housing cavity 812 of the stopper body 81. Under the drive of the switch button 7, the stopper body 81 moves in the proximal direction, the slide groove 811 moves in the proximal direction with respect to the guide block 17 of the housing 13, and the guide block 17 enters the second section of the slide groove 811. The stopper body 81 drives the stopper 83 to move in the proximal direction by the connecting arm 82, so that the stopper 83 moves to the second position area, that is, the position area where the stopper 83 is located as shown in fig. 14 and 15. Meanwhile, as shown in fig. 12 to 14, when the stopper 83 is located at the second position area, the stopper body 81 and the switch button 7 compress the compression spring 84, so that the compression spring 84 elastically deforms, and the compression spring 84 applies a biasing force to the switch button 7 in the proximal direction, and under the biasing force, the second fitting portion 72 of the switch button 7 and the first inner wall of the accommodating cavity 812 can be tightly fitted, so that the stopper 83 is maintained at the second position area. As shown in fig. 14 and 15, when the stopper 83 is located in the second position area, the stopper 83 is located at the proximal end side of the driving member 31 and no longer blocks the distal end of the driving member 31, and 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 enters the escape portion 211 at least partially, and a side surface of the proximal side of the first arm 821 facing the firing handle 3 does not protrude from a side surface of the rack 21 facing the firing handle 3, nor does it block the distal end of the driver 31 from entering between the teeth 212 of the rack 21. Therefore, in the state of fig. 15, when the trigger handle 3 is held again to rotate in the direction R1 in fig. 15, the driving member 31 of the trigger handle 3 cooperates with the rack 21 to drive the rack 21 to move toward the distal end of the stapler, and the rack 21 drives the entire actuating rod 2 to move toward the distal end, thereby triggering the stapler.

After the firing of the anastomat is completed, when the switching assembly is in the state shown in fig. 12 and the switching button 7 is pressed on the button part 74 (the button part 74 on the right side in fig. 12) on the other side, the switching assembly returns to the state shown in fig. 9 again when the switching button 7 is transversely moved to the first fitting part 71 to be fitted with the first inner wall of the accommodating cavity 812 under the guiding action of the guiding surface 731, that is, the stopper body 81 moves in the distal direction, the stopper body 81 drives the stopper 83 to move in the distal direction through the connecting arm 82 until the stopper 83 is again positioned on the side of the driving piece 31 toward the rack 21, and the driving piece 31 abuts against the lower surface of the stopper 83.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims (21)

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

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

an actuating rod, wherein a rack is arranged on one side of the actuating rod facing the firing handle;

the stop piece comprises a stop part, wherein the stop part is at least partially movably arranged on one side of the actuating rod, on which the rack is arranged, and can move between a first position area and a second position area;

the stop part is positioned in the first position area, and when the firing handle rotates along the first direction, the driving piece abuts against the stop part, so that the driving piece does not drive the rack to move.

2. The drive mechanism of claim 1, wherein the stop portion protrudes at least partially outside of the rack and is axially movable relative to the rack, or wherein a relief portion is provided on a side of the rack facing the firing handle, and wherein the stop portion at least partially enters the relief portion and is axially movable relative to the relief portion.

3. The drive mechanism of claim 2, wherein the relief is a recess provided in a middle portion of the rack that is recessed in a direction away from the firing handle.

4. The drive mechanism of claim 2, wherein a side surface of the stop facing the firing handle is flush with a side surface of the rack facing the firing handle or the side surface of the stop facing the firing handle protrudes from the side surface of the rack facing the firing handle.

5. The drive mechanism of claim 4, wherein the first location area is on a distal side of the second location area, the stop is on a side of the distal end of the drive member facing the rack when the stop is on the first location area, and the stop is on a proximal side of the distal end of the drive member when the stop is on the second location area;

the stop part is positioned in the second position area, and when the firing handle rotates along the first direction, the driving piece of the firing handle is matched with the rack so as to drive the actuating rod to move towards the distal end side of the anastomat.

6. The drive mechanism of claim 5, wherein the stop further comprises a stop body and a connecting arm, the stop body being connected to the stop by the connecting arm, the stop body being axially movable relative to the housing of the stapler body.

7. The drive mechanism according to claim 6, wherein the stopper body is provided with an axially extending chute, the housing of the stapler body is provided with a guide block, or the housing of the stapler body is provided with an axially extending chute, the stopper body is provided with a guide block;

the guide block at least partially enters the sliding groove and can move along the extending direction of the sliding groove.

8. The drive mechanism of claim 6, further comprising a switch knob, the switch knob comprising a first mating portion and a second mating portion, the switch knob being axially fixed with the housing of the stapler body;

when the first matching part of the switching button is matched with the stop piece body, the stop part is positioned in the first position area, and when the second matching part of the switching button is matched with the stop piece body, the stop part is positioned in the second position area.

9. The drive mechanism of claim 8, wherein the first mating portion has a smaller width in the axial direction than the second mating portion, and the first mating portion and the second mating portion are arranged in the lateral direction;

the first matching part of the switching button is matched with the stop piece body, and when the switching button moves transversely until the second matching part of the switching button is matched with the stop piece body, the switching button drives the stop piece to move towards the proximal side direction, so that the stop part of the stop piece enters the second position area.

10. The drive mechanism of claim 9, wherein the stopper body comprises a receiving cavity comprising oppositely disposed first and second inner walls, the switch knob comprising first and second sides;

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

11. The drive mechanism of claim 10, wherein an elastic member is disposed between the second side of the switch knob and the second inner wall of the receiving cavity, the elastic member causing the stopper to stay in the first position area or the second position area.

12. The drive mechanism of claim 10, wherein the second side of the switch knob is generally a laterally extending plane, and wherein the first side of the second mating portion of the switch knob protrudes proximally relative to the first side of the first mating portion.

13. The drive mechanism according to claim 12, wherein the first side of the switch knob is provided with a guiding surface connected between the first side of the first mating portion and the first side of the second mating portion.

14. The drive mechanism according to claim 9, wherein the switch knob is provided with one first engaging portion and two second engaging portions, the two second engaging portions being provided on both sides of the first engaging portion in the lateral direction.

15. The drive mechanism of claim 9, wherein the second mating portion is disposed outside of the first mating portion, and the switch knob further comprises a button portion located outside of the second mating portion, the button portion being at least partially exposed outside of the housing of the stapler.

16. The drive mechanism according to claim 9, wherein the housing of the stapler body is provided with a support protruding inward, the stopper body is provided at the support, and the stopper body is movable in an axial direction along the support.

17. The drive mechanism of claim 6, wherein the stopper body is located at a distal end side of the driver, the connection arm includes a first arm and a second arm connected, the stopper body is connected to the stopper portion sequentially through the second arm and the first arm, and the stopper portion is disposed at a proximal end side of the second arm.

18. The drive mechanism of claim 17, wherein the second arm extends longitudinally and the first arm extends axially, and the stop is a tab protruding from a proximal side of the first arm in a direction toward the firing handle.

19. The drive mechanism of claim 18, wherein a proximal side of the first arm at least partially enters the relief and a side surface of the proximal side of the first arm facing the firing handle does not protrude from a side surface of the rack facing the firing handle.

20. The drive mechanism of claim 1, wherein a side surface of the stop facing the firing handle is a plane parallel to an axial direction.

21. A medical stapler comprising the drive mechanism of any one of claims 1 to 20.

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