WO2024017108A1 - Closure switching mechanism and medical stapler - Google Patents

Abstract

A closure switching mechanism and a medical stapler. The closure switching mechanism comprises an actuating rod capable of moving in the axial direction of a medical stapler, a first switching structure being arranged on one side of the actuating rod; and a linking rod assembly (4), comprising a first rod (41) and a second rod (42) which are pivotally connected at a pivot connection part, the first rod (41) or the second rod (42) being provided with a second switching structure. When the linking rod assembly (4) is in a first state and the pivot connection part is driven towards the actuating rod, the linking rod assembly (4) enters a second state, and the second switching structure at least partially enters the first switching structure; and when the linking rod assembly (4) is in the second state and the actuating rod is driven towards a proximal side, the first switching structure drives the second switching structure in a direction away from the actuating rod, so as to move the pivot connection part in a direction away from the actuating rod, and enable the linking rod assembly (4) to enter the first state. The first switching structure of the actuating rod drives the second switching structure of the linking rod assembly (4) to move, so that a reload part can be opened.

Description

Closed switching mechanism and medical stapler Technical field

This application relates to the technical field of medical devices, and specifically to a closing switching mechanism and a medical stapler.

Background technique

The medical stapler includes a medical stapler body, a firing handle movably connected to the medical stapler body, and a nail head that cooperates with the body. The nail head includes a nail cartridge assembly and a nail anvil arranged oppositely. During the operation, first hold the firing handle, and pull 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. Then, hold the firing handle again to push the staples toward the tissue. Through the movement, the anastomotic staples in the staple cartridge assembly are formed at the staple anvil to anastomose the tissue, and at the same time, the cutter moves toward the distal side to cut the tissue.

The existing closed switching mechanism has a relatively complex structure and is very inconvenient to operate.

Contents of the invention

In view of the problems in the prior art, the purpose of this application is to provide a closed switching mechanism and a medical stapler. After firing, the first switching structure of the actuating rod drives the movement of the second switching structure of the connecting rod assembly to open the Nail the head.

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

An actuating rod can move along the axial direction of the stapler, and a first switching structure is provided on one side of the actuating rod;

A connecting rod assembly includes a first rod and a second rod pivotally connected at a pivot connection portion, the first rod is located on the distal side of the second rod, and the first rod or the second rod faces toward A second switching structure is provided on one side of the actuating rod, and the link assembly includes a first state and a second state;

When the link assembly is in the first state and the pivot connection is driven toward the actuating rod, the link assembly enters the second state and the second switching structure at least partially enters the the first switching structure, and the first switching structure can be driven to move in the distal direction relative to the second switching structure;

When the connecting rod assembly is in the second state and the actuating rod is driven in the proximal direction, the first switching structure drives the second switching structure in a direction away from the actuating rod, so that The pivot connection moves in a direction away from the actuating rod, and the link assembly enters the first state.

In this embodiment, the first switching structure is a relief groove extending in the axial direction, and the second switching structure is a protruding portion provided on the first rod or the second rod. The raised portion protrudes from a side surface of the first rod or the second rod facing the actuating rod; or,

The first switching structure is a convex portion protruding toward the connecting rod assembly, and the second switching structure is a relief groove provided on the connecting rod assembly. When the connecting rod assembly is in the second In this state, the relief groove extends along the axial direction.

In some embodiments, when the link assembly is in the second state and the actuating rod is driven in the proximal direction, the distal side wall of the first switching structure moves away from the actuating rod. The direction drives the second switching structure.

In some embodiments, the lateral width of the second switching structure is less than or equal to the lateral width of the first switching structure.

In some embodiments, the second switching structure is provided on the first rod. When the connecting rod assembly is in the first state, the second switching structure resists the second rod or is in contact with the second rod. There is a certain distance between the second rods; or,

The second switching structure is provided on the second rod. When the connecting rod assembly is in the first state, the second switching structure resists the first rod or is in contact with the first rod. There is a certain distance between them.

In some embodiments, the axial length of the first switching structure is greater than the axial length of the second switching structure, the link assembly is in the second state and the actuating rod is directed distally. When driven, the second switching structure does not block the first switching structure.

In some embodiments, when the link assembly enters the second state and the actuating rod is in the initial position, the distal surface of the second switching structure is in contact with the distal side wall of the first switching structure. fit together or have an axial gap between them.

In some embodiments, the distal side wall of the first switching structure and the distal surface of the second switching structure are respectively inclined surfaces, and the inclination directions of the two are the same.

In some embodiments, the first switching structure is provided on the proximal end side of the actuation rod.

In some embodiments, the proximal end of the first switching structure is connected to the proximal end surface of the actuation rod.

In some embodiments, the actuating rod includes a rack, and two rows of axially arranged driving teeth are provided on one side of the rack toward the connecting rod assembly, and the first switching structure is located on the two rows of driving teeth. One first switching structure is provided between the teeth or outside the rack. In some embodiments, the first lever includes a first pivot portion and a second pivot portion, the second lever includes a third pivot portion and a fourth pivot portion, and the first pivot portion can rotate is connected to the housing of the stapler, the second pivot part and the third pivot part are rotatably connected to form the pivot connection part, and the fourth pivot part is connected to a closing lever Rotatably connected.

In some embodiments, the second switching structure is disposed between the middle part of the first rod and the second pivot part, or the second switching structure is disposed between the middle part of the second rod and the second pivot part. between the third pivot joints.

In some embodiments, the second switching structure is provided on the second pivot part or the third pivot part.

In some embodiments, a firing handle is further included, the firing handle includes a first driving part, the first rod includes a second driving part, the connecting rod assembly is in the first state, and the firing handle is along the When rotating in the first rotation direction, the pivot connection moves toward the actuating rod, and the link assembly enters the second state.

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

The closed switching mechanism and medical stapler provided by this application have the following advantages:

In this application, a first switching structure is provided on one side of the actuating rod to give way to the second switching structure when the nail head is closed. The connecting rod assembly enters the second state from the first state and is driven by the closing pull tab assembly. The nail head is closed, and the second switching structure can enter the first switching structure without affecting the closure of the nail head, and does not affect the movement of the actuating rod to the distal direction, and will not affect the normal firing of the stapler. , and after the stapler is fired, when the actuating rod is driven to move in the proximal direction, the side wall of the first switching structure can drive the second switching structure, so that the connecting rod assembly returns to the second state, so that the stapler can be reopened. The head has a simple structure, does not need to add new mechanical parts, and is easy to operate.

Description of drawings

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

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

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

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

Figure 4 is a structural schematic diagram of the cooperation between the connecting rod assembly and the rack in the first state according to an embodiment of the present application;

Figure 5 is a schematic structural diagram of a rack according to an embodiment of the present application;

Figure 6 is a bottom view of the rack according to an embodiment of the present application;

Figure 7 is a cross-sectional view along the A1-A1 direction in Figure 6;

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

Figure 9 is a cross-sectional view along the A2-A2 direction in Figure 8;

Figure 10 is a schematic structural diagram of the closing switching mechanism after the nail head is closed according to an embodiment of the present application;

Figure 11 is a schematic structural diagram of the firing handle being reset after the nail head is closed according to an embodiment of the present application;

Figure 12 is a schematic structural diagram of the connecting rod assembly and the rack in the second state according to an embodiment of the present application;

Figure 13 is a schematic structural diagram of the coupling between the connecting rod assembly and the rack when the stapler is fired according to an embodiment of the present application;

Figure 14 is a schematic structural diagram of the rack drive link assembly when it is reset according to an embodiment of the present application;

Figure 15 is a schematic structural diagram of the connecting rod assembly and the rack in the first state according to another embodiment of the present application;

Figure 16 is a schematic structural diagram of the connecting rod assembly and the rack in the second state according to another embodiment of the present application.

Reference signs:

1 stapler body 42 second rod

11 fixed handle 421 third pivot joint

13 Housing 422 Fourth Pivot Joint

15 Handle return spring 43 First pin

18 Connecting Rod 44 Second Pin

19 Retraction lever 45 Third pin

2 Rack 46 Switching Section

21 Driving teeth 461 The distal surface of the switching part

22 Giving slot 51 Closing tie rod

221 Distal side wall of the relief slot 52 Close return spring

3 Firing handle 53 Closing pull tab

31 Claw 9 Nail Head

32 First driving part 91 Nail anvil

4 Connecting Rod Assembly 911 First Fitting Groove

41 The first rod 92 Nail bin assembly

411 Second driving part 921 Second matching groove

412 First pivot joint 93 Closing pin

413 Second pivot joint

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can take many forms embodiments and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the drawings represent the same or similar structures, and thus their repeated description will be omitted. The words “or” and “or” in the description may mean “and” or “or”. Although the terms "upper,""lower,""between," etc. may be used in this specification to describe various illustrative features and elements of the present application, these terms are used herein for convenience only, such as in the drawings. direction of the example described. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of a structure to fall within the scope of this application. Although "first" or "second" are used in this specification to refer to certain features, they are only used for expression purposes and serve as limitations on the number and importance of specific features.

The present application provides a closing switching mechanism for a medical stapler and a medical stapler including the same. The closing switching mechanism includes: an actuating rod, which can move along the axial direction of the stapler; a first switching structure is provided on one side of the actuating rod; a connecting rod assembly, including a pivoting connection at a pivot connection portion; A first rod and a second rod, the first rod is located on the distal side of the second rod, and a second switch is provided on one side of the first rod or the second rod toward the actuating rod. Structure, the connecting rod assembly includes a first state and a second state. In the initial state, the connecting rod assembly is in the first state and the nail head is in an open state. The link assembly enters the second state when the pivot connection is driven toward the actuating rod. When the connecting rod assembly is in the second state, the second switching structure at least partially enters the first switching structure, and the connecting rod assembly drives the closing pull tab assembly of the stapler to move toward the proximal direction to close. Nail the head. Therefore, during the closing process of the nail head, the first switching structure gives way to the second switching structure, and the second switching structure can enter the first switching structure without affecting the closing of the nail head. . Moreover, at this time, the first switching structure can be driven to move in the distal direction relative to the second switching structure, so that the actuating rod can be driven to move in the distal direction to normally fire the stapler. After the stapler is fired, when the connecting rod assembly is in the second state and the actuating rod is driven to move in the proximal direction, the first switching structure presses the actuating rod in a direction away from the actuating rod. The second switching structure causes the pivot connection portion to move in a direction away from the actuation rod, the link assembly enters the first state, and the link assembly drives the closing pull tab assembly of the stapler toward The distal lateral movement reopens the nail head. The closed switching mechanism can switch between the open and closed states of the nail head without adding too many parts, has a simple structure and is easy to operate.

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

As shown in Figures 1 to 14, they are schematic structural diagrams of a closing switching mechanism and a stapler according to an embodiment of the present application. like As shown in Figures 1 and 2, the stapler includes a nail head 9, a stapler body 1 and the closure switching mechanism. The closure switching mechanism includes a firing handle 3 rotatably connected to the stapler body 1 and a closure pull tab 53 for closing the nail head 9 . The stapler body 1 includes a housing 13 , a connecting rod 18 and a fixed handle 11 . The nail head 9 is provided on the distal end side of the connecting rod 18 of the stapler body 1 . The stapler body 1 is also provided with a handle return spring 15 connected to the firing handle 3 . When the firing handle 3 is not held, it is located at an initial position away from the fixed handle 11 . The firing handle 3 can be held by the operator and rotated along the first rotation direction D1 to be close to the fixed handle 11, driving the handle return spring 15 to deform. After releasing the firing handle 3, under the action of the handle return spring 15, it will move along the first The second rotation direction D2 (shown in FIG. 11 ) rotates away from the fixed handle 11 and returns to the initial position.

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

In this application, the distal side and the proximal side are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical site is the distal side. The end side refers to the direction along the axis of the stapler as the axial direction, that is, the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. For example, in the perspective of FIG. 1 , the distal side of the stapler is the left side and the proximal side is the right side. The S1 direction in Figure 1 is the direction from the proximal side to the distal side of the stapler. The S2 direction in Figure 2 is the direction from the distal side to the proximal side of the stapler. The S1 direction is defined as the first axial direction, the S2 direction is the second axial direction, and the S1 direction and S2 direction are collectively referred to as the axial direction. Define the S3 direction in Figure 1 as the longitudinal direction, that is, the height direction. The S4 direction in Figure 6 is defined as the transverse direction, that is, the width direction. The D1 direction in Figure 2 is the first rotation direction, that is, the clockwise direction in Figure 2, and the D2 direction in Figure 11 is the second rotation direction, that is, the counterclockwise direction in Figure 11 needle direction.

As shown in FIGS. 2 to 3 , the closing switching mechanism also includes an actuating rod, a connecting rod assembly 4 and a closing pull rod 51 . In this embodiment, the actuating rod is a rack 2 , and a plurality of driving teeth 21 are provided on one side of the rack 2 toward the link assembly 4 . The firing handle 3 is provided with a claw 31 on one side facing the rack 2. The claw 31 engages with the driving tooth 21 and the firing handle 3 rotates along the first rotation direction D1. The pawl 31 can drive the rack 2 to move distally along the second axial direction S2 through the driving teeth 21 . The rack 2 is fixedly connected to a retracting pull rod 19 that can be operated outside the housing 13. By operating the retracting pull rod 19, the rack 2 can be driven to move in the axial direction.

As shown in Figures 2 to 4, the link assembly 4 includes a first rod 41 and a second rod 42 that are pivotally connected at a pivot connection. The first rod 41 is located far away from the second rod 42. end side. The first rod 41 includes a first pivot part 412 and a second pivot part 413 , and the second rod 42 includes a third pivot part 421 and a fourth pivot part 422 . The first pivot portion 412 is rotatably connected to the housing 13 of the stapler through a first pin 43, so that the first pivot portion 412 can only rotate relative to the housing 13, It cannot move axially relative to the housing 13 . The second pivot portion 413 and the third pivot portion 421 are rotatably connected through a second pin 44 to form the pivot connection portion. The fourth pivot portion 422 is rotatably connected to the closing lever 51 through a third pin 45 . The closing pull rod 51 and the proximal end of the closing pull tab 53 are fixedly connected through a fixed pin (not shown in the figure). The closing pull rod 51 and the closing pull tab 53 form a closing pull tab assembly. A closed return spring 52 is provided on the proximal side of the pull rod 51, which may be a compression spring, for example, but the application is not limited thereto. The closed return spring 52 may also be replaced by a tension spring, a spring, or other elastic structures.

The connecting rod assembly 4 includes a relatively stable first state and a second state. Figures 3 to 4 and 9 show the first state of the connecting rod assembly 4. Figures 10 to 13 show the second state of the connecting rod assembly 4. When the link assembly 4 is in the first state, the second pivot portion 413 and the third pivot portion 421 are in a position away from the rack 2 . The axial distance between the first pivot part 412 and the fourth pivot part 422 is small, and the nail head is in an open state. When the second pivot portion 413 and the third pivot portion 421 move toward the rack 2 to a position close to the rack 2, the first pivot portion 412 and the fourth pivot portion 413 move toward the rack 2 to a position close to the rack 2. The axial distance between the joints 422 increases, driving the closing pull rod 51 to move in the proximal direction, and then driving the closing pull tab 53 to move in the proximal direction to close the nail head, and at this time a stable position is reached. Second state. In this embodiment, the firing handle 3 further includes a first driving part 32 , and the first rod 41 further includes a second driving part 411 . When the connecting rod assembly 4 is in the first state and the firing handle 3 rotates along the first rotation direction D1, the first rod 41 is driven to also rotate along the first rotation direction D1, driving the second pivot portion 413 and the third pivot portion 421 moves upward. When moving, the second rod 42 rotates along the second rotation direction D2, and then switches to the second state of the link assembly 4. Therefore, in this embodiment, the closing of the nail head is also driven by the firing handle 3.

As shown in Figures 5 to 9, a first switching structure is provided on the side of the rack 2 facing the connecting rod assembly 4, and a second switching structure is provided on the side of the first rod 41 facing the rack 2. structure. In this embodiment, the first switching structure is a relief groove 22 that is recessed upward relative to the bottom surface of the rack 2 , and the relief groove 22 extends in the axial direction. The second switching structure is a switching part 46 provided on the first rod 41 , and the switching part 46 is a protruding part. In this embodiment, the rack 2 includes two rows of driving teeth 21 , and each row of driving teeth 21 extends along the axial direction. The relief groove 22 is located on the proximal end side of the rack 2 and between the two rows of driving teeth 21 . As shown in FIG. 9 , a switching portion 46 is provided on the side of the first rod 41 facing the rack 2 . The switching part 46 is a protruding part provided on the first rod 41 , and the switching part 46 protrudes from a side surface of the first rod 41 facing the rack 2 . The switching part 46 may be integrally formed with the first rod 41 , or the switching part 46 and the first rod 41 may be formed separately and fixed together by welding, riveting, screwing, etc. Optionally, the switching part 46 is provided between the middle part of the first rod 41 and the first pivot part 412, or is provided on the first pivot part 412 of the first rod 41, so as to The position closer to the pivot connection portion can better drive the pivot connection portion to move downward when receiving downward force, so that the link assembly 4 can switch back to the first state from the second state more smoothly.

The working process of the closed switching mechanism will be introduced in detail below with reference to Figures 2 to 14.

As shown in Figures 2 to 9, in the initial state, the connecting rod assembly 4 is in the first state, the firing handle 3, the rack 2 and the closing pull rod 51 are in their initial positions respectively, and the nail head is in the open state. At this time, the second pivot portion 413 and the third pivot portion 421 are in a position away from the rack 2 . The switching part 46 is also at a position away from the rack 2 . The switching part 46 can optionally be provided at the second pivot part 413 or at a position close to the second pivot part 413 to better separate from the rack 2 in the first state. The proximal end surface of the switching part 46 is in contact with the side surface of the second rod 42 facing the rack 2, or there is a certain distance between the two surfaces, so that there is a gap between the switching part 46 and the second rod 42. There will be no interference.

As shown in Figure 10, when the connecting rod assembly 4 is in the first state and the firing handle 3 is held, the firing handle 3 rotates along the first rotation direction D1, and the driving handle return spring 15 elastically deforms, and the first driving part 32 drives the first rod 41 to rotate along the first rotation direction D1, and drives the second rod 42 to rotate along the second rotation direction D2 through the second pin 44. The second pivot portion 413 and the third pivot portion The connecting portion 421 moves upward to a position close to the rack 2 . The axial distance between the fourth pivot portion 422 and the first pivot portion 412 increases. Since the first pivot portion 412 is axially fixed relative to the housing 13, the fourth pivot portion 422 is axially fixed relative to the housing 13. The connecting portion 422 moves toward the proximal direction along the first axis S1, and the link assembly 4 enters the second state. At the same time, the mentioned The four pivot portions 422 drive the closing lever 51 to move in the proximal direction to compress the closing return spring 52. The closing lever 51 drives the closing pull tab 53 to move in the proximal direction along the first axis S1 to close the nail head. . At this time, because the connecting rod assembly 4 has entered a stable second state, even if the firing handle 3 is released, the firing handle 3 will rotate and reset along the second rotation direction D2 under the action of the handle return spring 15, and the first drive The part 32 no longer resists the second driving part 411, and the link assembly 4 can still remain in the second state, that is, the closing switching mechanism enters the state shown in Figure 11, and the nail head can be kept stable. in closed state.

When the link assembly 4 switches from the first state to the second state, the switching part 46 at least partially enters the relief groove 22 and reaches the state shown in FIG. 12 . Therefore, through the relief effect of the relief groove 22, the rack 2 will not block the normal closing of the nail head. As shown in FIG. 12 , at this time, the rack 2 is still in its initial position, and the distal surface 461 of the switching part 46 is aligned with the distal side wall 221 of the relief groove 22 in the axial direction. The distal end surface 461 of 46 is in contact with the distal side wall 221 of the relief groove 22 or there is an axial gap therebetween. The lateral width of the switching part 46 is less than or equal to the lateral width of the relief groove 22 , and optionally the lateral width of the switching part 46 is smaller than the lateral width of the relief groove 22 , so that the switching part 46 is more It is easy to enter the relief groove 22.

In the state shown in Figures 11 and 12, the nail head is in a closed state, and the firing handle 3 can be held again at this time. The firing handle 3 rotates along the first rotation direction D1, the claws 31 of the firing handle 3 engage with the driving teeth 21 of the rack 2, and the driving rack 2 moves toward the distal side along the second axial direction S2. In this embodiment, the axial length of the relief groove 22 is greater than the axial length of the switching part 46 , the switching part 46 at least partially enters the relief groove 22 and the rack 2 moves along the second When the axial direction S2 moves toward the distal side, the switching portion 46 enters the proximal end portion of the relief groove 22 without blocking the movement of the relief groove 22 along the second axial direction S2. Therefore, the switching part 46 will not affect the normal firing of the stapler. In this embodiment, the proximal end of the relief groove 22 is connected to the proximal end surface of the rack 2 . In other alternative embodiments, the relief groove 22 may also be provided with a second side wall located on the proximal side, that is, a proximal side wall, and after the stapler is fired, the proximal end of the switching part 46 The surface fits the proximal side wall of the relief groove 22 or there is a certain axial distance between them without interference.

After the stapler is fired, the rack 2 is in its fired position. At this time, the rack 2 can be driven to move in the proximal direction along the first axis S1 by pulling the retraction rod 19 . At this time, the link assembly 4 is still in the second state, the switching part 46 at least partially enters the relief groove 22 , and the distal end surface 461 of the switching part 46 is in contact with the distal end of the relief groove 22 . The end side walls 221 are axially aligned. As shown in Figure 14, after the rack 2 moves until the distal side wall 221 of the relief groove 22 is in contact with the distal surface 461 of the switching part 46, if Continuing to drive the rack 2 to move proximally along the first axis S1, the distal side wall 221 of the relief groove 22 gives the distal surface 461 of the switching part 46 a downward and proximal direction. The lateral force is to press the switching part 46 in a direction away from the rack 2. The switching part 46 drives the pivot connection part to move in a direction away from the rack 2. The pivot After the connecting portion moves to the initial position away from the rack 2, the link assembly 4 enters the first state. In this embodiment, the distal side wall 221 of the relief groove 22 and the distal surface 461 of the switching part 46 are respectively inclined surfaces, and the two inclination directions are the same, so that the rack 2 moves proximally. When moving in the end-side direction and acting on the switching part 46, the force exerted by the relief groove 22 on the switching part 46 can decompose more of the downward pressure component. During the switching process of the connecting rod assembly 4 from the second state to the first state, the first rod 41 rotates around the second rotation direction D2, and the second rod 42 rotates around the first rotation direction D1. The axial distance between the four pivot portions 422 and the first pivot portion 412 is shortened, and the fourth pivot portion 422 drives the closing pull rod 51 to move toward the distal direction, thereby driving the closing pull tab 53 toward the distal side. Move distally to reopen the nail head. Therefore, by adopting the closed switching mechanism of the present application, there is no need to add too many parts, and the nail head can be switched from the closed state to the open state by driving the axial movement of the actuating rod. The structure is simple and the operation is convenient.

As shown in Figures 15 and 16, it is a schematic structural diagram of a closing switching mechanism according to another embodiment of the present application. The difference between this embodiment and the embodiment of FIGS. 1 to 14 is that the second switching structure is provided on the second rod 42 . In this embodiment, the second switching structure is a switching part 46 provided on the second rod 42 , and the switching part 46 protrudes from the second rod 42 toward the rack 2 A raised portion on one side of the surface. The switching part 46 may be integrally formed with the second rod 42 , or the switching part 46 and the second rod 42 may be formed separately and fixed together by welding, riveting, screwing, etc. Optionally, the switching part 46 is provided between the middle part of the second rod 42 and the third pivot part 421 , or is provided on the third pivot part 421 . By arranging the switching part 46 at or near the pivot connection part, when the relief groove 22 drives the switching part 46 to move downward, the force can be better transmitted to the pivot connection part. The connecting rod assembly 4 is driven to switch from the second state to the first state more smoothly. As shown in Figure 15, when the link assembly 4 is in the first state, the switching part 46 resists the first rod 41, or has a certain distance from the first rod 41, and There will be no interference with the first rod 41 . As shown in Figure 16, after the link assembly 4 enters the second state, the switching part 46 at least partially enters the inside of the relief groove 22, and the distal end surface 461 of the switching part 46 is in contact with the The distal side walls 221 of the relief groove 22 are aligned in the axial direction, and they fit together or there is a certain axial distance between them, so the rack 2 does not affect the normal closing of the stapler. During the firing process of the stapler, the rack 2 moves toward the distal side along the second axis S2. The switching part 46 will not block the movement of the relief groove 22, and the stapler can Fire normally. After the stapler is fired, the driving rack 2 moves proximally along the first axis S1 until the distal side wall 221 of the relief groove 22 is in contact with the distal surface 461 of the switching part 46, and then continues to drive the rack. 2 moves proximally along the first axis S1, and the distal side wall 221 of the relief groove 22 presses the distal surface 461 of the switching part 46, so that the switching part 46 drives the pivot connection part toward Moving away from the rack 2, the link assembly 4 returns to the first state, and drives the nail head to open again through the closing pull rod 51 and the closing pull tab 53. The distal side wall 221 of the relief groove 22 and the distal surface 461 of the switching part 46 are respectively inclined surfaces, and their inclination directions are the same, so that the rack 2 moves and acts in the proximal direction. When the switching part 46 is located, the force exerted by the relief groove 22 on the switching part 46 can decompose more of the downward pressure component.

In the embodiment shown in FIGS. 15 and 16 , other components not described or shown may adopt the structure of the corresponding components or the structure of modifications of the embodiment shown in FIGS. 1 to 14 , and will not be described again here.

In the above embodiments, the first switching structure is a relief groove provided on the bottom surface of the rack, and the second switching structure is a protruding portion provided on the connecting rod assembly. In another embodiment, the first switching structure may be a raised portion provided on the rack and protruding downward, and the second switching structure may be a relief groove extending along the axial direction. When the linkage assembly is in the first state and the pivot connection is driven toward the actuating rod, the linkage assembly enters the second state with the boss at least partially intruding into the The relief groove is provided, and the protruding portion can be driven to move in the distal direction relative to the relief groove. When the connecting rod assembly is in the second state and the actuating rod is driven in the proximal direction, the protruding portion drives the proximal side wall of the relief groove in a direction away from the rack, so that The relief groove drives the pivot connection part to move away from the rack, and the link assembly enters the first state. Since the rack is the actuating part during the firing process, its structural strength plays a large role in the stability of firing. The advantage of providing a protrusion on the rack and a relief groove on the connecting rod assembly is that there is no need to make a groove on the rack body, which avoids affecting the structural strength of the rack due to the relief groove and improves the firing efficiency of the stapler. stability.

In yet another embodiment, the first switching structure is a relief groove provided on the rack, and the second switching structure is a protrusion provided on the connecting rod assembly. The relief groove is not provided on the bottom surface of the rack, but on the outer side of the rack. For example, an axially extending relief groove is provided on one outer surface of the rack, or an axially extending relief groove is provided on two outer surfaces of the rack. The number of protrusions of the connecting rod assembly corresponds to the number of relief grooves. That is, when a relief groove is provided on one outer side of the rack, the connecting rod assembly is provided with a corresponding raised portion; when relief grooves are provided on both outer sides of the rack, the connecting rod assembly is provided with two corresponding relief grooves. a convex part. Therefore, the bottom surface of the rack does not need to be grooved, which avoids affecting the structural strength of the rack due to the opening of a relief groove at the bottom of the rack, and also improves the stability of the stapler's firing.

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

Claims (16)

A closing switching mechanism, characterized in that it is used in a medical stapler, and the closing switching mechanism includes: An actuating rod can move along the axial direction of the stapler, and a first switching structure is provided on one side of the actuating rod; A connecting rod assembly includes a first rod and a second rod pivotally connected at a pivot connection portion, the first rod is located on the distal side of the second rod, and the first rod or the second rod faces toward A second switching structure is provided on one side of the actuating rod, and the link assembly includes a first state and a second state; When the linkage assembly is in the first state and the pivot connection is driven toward the actuating lever, the linkage assembly enters the second state; When the link assembly is in the second state, the second switching structure at least partially enters the first switching structure, and the first switching structure can be driven far away from the second switching structure. Movement in the end-side direction; when the connecting rod assembly is in the second state and the actuating rod is driven in the proximal direction, the first switching structure drives the third switching structure in a direction away from the actuating rod. The second switching structure causes the pivot connection part to move in a direction away from the actuating rod, and the link assembly enters the first state. The closed switching mechanism according to claim 1, wherein the first switching structure is an axially extending relief groove, and the second switching structure is provided on the first rod or the second A raised portion of the rod, the raised portion protrudes from a side surface of the first rod or the second rod facing the actuating rod; or, The first switching structure is a convex portion protruding toward the connecting rod assembly, and the second switching structure is a relief groove provided on the connecting rod assembly. When the connecting rod assembly is in the second In this state, the relief groove extends along the axial direction. The closed switching mechanism according to claim 2, wherein when the link assembly is in the second state and the actuating rod is driven in the proximal direction, the distal end of the first switching structure The side wall drives the second switching structure in a direction away from the actuating rod. The closed switching mechanism according to claim 2, wherein the lateral width of the second switching structure is less than or equal to the lateral width of the first switching structure. The closed switching mechanism according to claim 2, characterized in that the second switching structure is provided on the first rod, and when the connecting rod assembly is in the first state, the second switching structure and the The second rod is against or has a certain distance from the second rod; or, The second switching structure is provided on the second rod. When the connecting rod assembly is in the first state, the second switching structure resists the first rod or is in contact with the first rod. There is a certain distance between them. The closed switching mechanism according to claim 3, wherein the axial length of the first switching structure is greater than the axial length of the second switching structure, the connecting rod assembly is in the second state and the When the actuation rod is driven in the distal direction, the second switching structure does not block the first switching structure. The closed switching mechanism according to claim 6, characterized in that when the link assembly enters the second state and the actuating rod is in the initial position, the distal end surface of the second switching structure is in contact with the The distal side walls of the first switching structure are in contact with each other or there is an axial gap therebetween. The closed switching mechanism according to claim 6, wherein the distal side wall of the first switching structure and the distal end surface of the second switching structure are respectively inclined surfaces, and the inclination directions of the two are the same. The closing switching mechanism according to claim 6, wherein the first switching structure is provided on the proximal end side of the actuating rod. The closing switching mechanism according to claim 6, wherein the proximal end of the first switching structure is connected to the proximal end surface of the actuating rod. The closed switching mechanism according to claim 1, wherein the actuating rod includes a rack, and two rows of driving teeth arranged in the axial direction are provided on one side of the rack toward the connecting rod assembly, so The first switching structure is located between two rows of driving teeth, or one first switching structure is provided outside the rack. The closing switching mechanism according to claim 1, wherein the first lever includes a first pivot portion and a second pivot portion, and the second lever includes a third pivot portion and a fourth pivot portion. , the first pivot part is rotatably connected to the housing of the stapler, the second pivot part and the third pivot part are rotatably connected to form the pivot connection part, so The fourth pivot portion is rotatably connected to a closing pull rod. The closed switching mechanism according to claim 12, characterized in that the second switching structure is provided between the middle part of the first rod and the second pivot part, or the second switching structure is provided Between the middle part of the second rod and the third pivot part. The closing switching mechanism according to claim 12, wherein the second switching structure is provided at the second pivot part or the third pivot part. The closing switching mechanism according to claim 1, further comprising a firing handle, the firing handle includes a first driving part, the first rod includes a second driving part, and the connecting rod assembly is in the third driving part. In one state, when the firing handle rotates in the first rotation direction, the pivot connection moves toward the actuating rod, and the link assembly enters the second state. A medical stapler, characterized by comprising the closing switching mechanism according to any one of claims 1 to 15.