CN116262057A - Closed switching mechanism and medical anastomat - Google Patents

Abstract

The invention provides a closing switching mechanism and a medical anastomat, wherein the closing switching mechanism comprises: the connecting rod assembly comprises a first pivoting part and a second pivoting part, and the first pivoting part is pivotally connected to the anastomat body; the closed pull rod assembly is pivotally connected to the second pivot part; the switching driving piece is pivotally connected to the closing pull rod assembly; when the switching driving piece moves towards the first moving direction, the closing pull rod assembly is driven to move towards the first moving direction, so that the connecting rod assembly enters the second state from the first state; when the switching driving piece rotates along a first rotation direction relative to the closing pull rod assembly, the connecting rod assembly is driven to enter the first state, and the second pivoting part drives the closing pull rod assembly and the switching driving piece to move towards the second movement direction. The invention can realize manual closing and manual opening of the nail head.

Description

Closed switching mechanism and medical anastomat

Technical Field

The invention relates to the technical field of medical instruments, in particular to a closing switching 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. In the existing closing switching mechanism, the structure is complex, and after the percussion of the anastomat is completed, the problem that the nail head is difficult to open possibly occurs, so that inconvenience is brought to the operation of an operator.

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 closing switching mechanism and a medical anastomat, and the manual closing and the manual opening of the nail head can be realized by operating a switching driving piece to move in different directions.

The embodiment of the invention provides a closing switching mechanism for a medical anastomat, which comprises the following components:

the connecting rod assembly comprises a first pivoting part and a second pivoting part, the first pivoting part is pivotally connected to the anastomat body, and the connecting rod assembly comprises a first state and a second state;

the closed pull rod assembly is pivotally connected to the second pivot part;

the switching driving piece is pivotally connected to the closing pull rod assembly and can move along a first moving direction and a second moving direction, and the first moving direction is opposite to the second moving direction;

when the switching driving piece moves towards the first moving direction, the closing pull rod assembly is driven to move towards the first moving direction, so that the connecting rod assembly enters the second state from the first state; when the switching driving piece rotates along a first rotation direction relative to the closing pull rod assembly, the connecting rod assembly is driven to enter the first state, and the second pivoting part drives the closing pull rod assembly and the switching driving piece to move towards the second movement direction.

In some embodiments, the switch drive includes a first drive portion and a rotating mating portion pivotally connected to the closure tie bar assembly by a rotational axis, the link assembly including a second drive portion;

when the connecting rod assembly is in the second state and the switching driving piece rotates along the first rotation direction, the first driving part drives the second driving part, so that the connecting rod assembly enters the first state.

In some embodiments, the first drive portion drives the second drive portion in a direction away from the connecting rod when the connecting rod assembly is in the second state and the switching drive rotates in the first rotational direction.

In some embodiments, the link assembly includes a first rod and a second rod, the second rod being located on a proximal side of the first rod, the first rod including the first pivot and a third pivot, the second rod including the second pivot and a fourth pivot, the third pivot being pivotally connected to the fourth pivot;

when the connecting rod assembly enters the second state from the first state, the third pivoting part and the fourth pivoting part move towards the connecting rod; when the switching driving piece rotates along the first rotation direction, the switching driving piece drives the third pivoting part and the fourth pivoting part to move towards a direction far away from the connecting rod.

In some embodiments, the second driving portion is disposed at the third pivot portion or the fourth pivot portion.

In some embodiments, when the connecting rod assembly is in the second state, the first driving portion is located on a side of the second driving portion facing the connecting rod, and a certain height gap is formed between surfaces of the first driving portion and the second driving portion opposite to each other.

In some embodiments, the switching driving piece further includes a first outer sleeve portion, the closing pull rod assembly includes a second outer sleeve portion and a third driving portion, the first outer sleeve portion is sleeved outside the second outer sleeve portion, the second outer sleeve portion is sleeved outside the connecting rod, the third driving portion is pivotally connected with the second pivoting portion of the connecting rod assembly, and when the second outer sleeve portion moves towards the first moving direction, the connecting rod assembly is driven to enter the second state from the first state.

In some embodiments, the first driving portion is a driving arm extending from the rotation matching portion to the second moving direction, the rotation matching portion is a bending portion connected between the first outer sleeve portion and the first driving portion, and a fixed angle is arranged between the first driving portion and the first outer sleeve portion.

In some embodiments, the rotary engagement portion is pivotally connected to a third drive portion of the closure tie assembly via the rotary shaft.

In some embodiments, the third driving part of the closing pull rod assembly is provided with at least one guiding part, the inner surface of the shell of the anastomat body is provided with at least one guiding groove extending along the axial direction, or the third driving part is provided with at least one guiding groove extending along the axial direction, and the inner surface of the shell of the anastomat body is provided with at least one guiding part;

the guide portion enters the guide groove, and the guide portion is movable in an extending direction of the guide groove.

In some embodiments, a closure biasing member is disposed between the second housing portion of the closure pull rod assembly and the stapler body, the closure biasing member imparting a first biasing force to the closure pull rod assembly in the second direction of movement.

In some embodiments, a switching bias is disposed between the switching drive and the closure bar assembly, the switching bias deforming when the switching drive rotates in a first rotational direction relative to the closure bar assembly to apply a second biasing force to the switching drive that rotates in a second rotational direction opposite the first rotational direction.

In some embodiments, the switching bias member is a switching return spring, a first spring mounting portion is disposed on the closing pull rod assembly, a second spring mounting portion is disposed on the switching drive member, two ends of the switching return spring are respectively fixed on the first spring mounting portion and the second spring mounting portion, and a proximal end face of the switching drive member is at least partially abutted to the closing pull rod assembly when no external force is applied.

In some embodiments, the switching drive piece comprises an operating portion, the operating portion is arranged on the first outer sleeve portion and protrudes out of the outer surface of the shell of the anastomat body, and the shell is provided with a containing groove for containing the operating portion.

In some embodiments, a closure tab is also included, the proximal side of the closure tab being connected to the closure tab assembly by a connecting pin.

In some embodiments, the first direction of movement and the second direction of movement are along an axial direction of the stapler.

In some embodiments, the first direction of movement is toward a proximal side of the stapler and the second direction of movement is toward a distal side of the stapler.

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

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

the invention provides a closing switching mechanism for a medical anastomat, which can drive a connecting rod assembly to switch between different states through operating a switching driving piece, control a closing pull rod assembly to move along the axial direction of the anastomat, can drive the closing pull rod assembly to move along a first moving direction to close a nail head when the switching driving piece moves along the first moving direction, and can drive the closing pull rod assembly to move along a second moving direction to open the nail head when the switching driving piece rotates along the first rotating direction.

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 medical stapler according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of a nail head according to an embodiment of the present invention;

FIG. 3 is a schematic view of the stapler body with a portion of the housing removed, according to an embodiment of the invention;

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

FIGS. 5 and 6 are schematic illustrations of the engagement of a closure tie assembly and a switch actuator in accordance with an embodiment of the present invention;

FIG. 7 is a schematic view of a closed switching mechanism when the connecting rod assembly is in a first state according to an embodiment of the present invention;

FIG. 8 is an exploded view of a closure switching mechanism according to an embodiment of the present invention;

FIG. 9 is a schematic view of a closed switching mechanism when the linkage assembly is in the second state according to an embodiment of the present invention;

FIG. 10 is a schematic illustration of a switching drive engaged with a linkage assembly according to an embodiment of the present invention;

FIG. 11 is a schematic view of a switching mechanism of an embodiment of the present invention when the switching driving member rotates;

fig. 12 is a schematic structural view of a switching mechanism when a switching driving member rotates according to another embodiment of the present invention.

Reference numerals:

1. spring-fitting stepped surface of stapler body 512

11. The fixed handle 513 switches mating surfaces

12. First spring mounting portion of closure tab 514

13. Third driving part of the housing 52

14. Stop 521 guide

18. First mating hole of connecting rod 522

19. Connecting pin 523 rotation shaft

3. Firing handle 61 closes the return spring

4. Connecting rod assembly 62 switches return springs

41. First lever 7 switching drive

411. Second drive portion 71 first outer sleeve portion

412. First pivot portion 72 first driving portion

413. Operating part of the third pivot part 73

414. The boss 74 second spring mounting portion

42. Second lever 75 rotation engagement portion

422. Second pin joint 751 second mating hole

423. Fourth pin joint 9 pin head

43. First pin 91 nail anvil

44. First matching groove of second pin shaft 911

45. Third pin 92 nail bin assembly

5. Second mating groove of closing pull rod assembly 921

51. Second jacket portion 93 closing pin

511. Through hole

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 closing switching mechanism for a medical anastomat and the medical anastomat comprising the same. The anastomat further comprises a nail head and an anastomat body, wherein the nail head is arranged on the far end side of the anastomat body, a closing pull piece for closing the nail head is arranged in the anastomat body, and the far end side of the closing pull piece is connected to the nail head. The closure switching mechanism includes: the connecting rod assembly comprises a first pivoting part and a second pivoting part, the first pivoting part is pivotally connected to the anastomat body, and the connecting rod assembly comprises a first state and a second state; the closed pull rod assembly is pivotally connected to the second pivot part; the switching driving piece is pivotally connected to the closing pull rod assembly and can move along a first moving direction and a second moving direction, and the first moving direction is opposite to the second moving direction.

When the nail head of the anastomat needs to be closed, the switching driving piece is operated to move towards the first moving direction, the closing pull rod assembly is driven to move towards the first moving direction, the connecting rod assembly enters the second state from the first state, and the closing pull rod assembly can drive the closing pull piece to close the nail head. When the switching driving piece rotates along a first rotation direction relative to the closing pull rod assembly, the connecting rod assembly is driven to enter the first state, the second pivoting part drives the closing pull rod assembly and the switching driving piece to move towards a second movement direction, and the closing pull rod assembly can drive the closing pull piece to open the nail head. Therefore, the connecting rod assembly can be driven to be switched between different states through operating the switching driving piece, and the closing pull rod assembly is controlled to move along the axial direction of the anastomat, so that the closing and opening of the nail head are controlled, and the stapler is simple in structure and convenient to use.

The following describes the structure of the closing switching mechanism of various embodiments of the present invention in detail with reference to the accompanying drawings, and it is to be understood that the various embodiments are not limiting of the scope of the present invention.

As shown in fig. 1 to 11, 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 stapler body 1 is provided with a closing tab 12 for closing the nail head 9, the distal side of the closing tab 12 being 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 distal end side to the proximal end 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.

As shown in fig. 2, 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 93 is simultaneously threaded through the first mating groove 911, the second mating groove 921 and the distal side of the closure tab 12. When the closing tab 12 moves in the proximal direction, the closing pin 93 also moves in the proximal direction, and drives the anvil 91 to move toward the cartridge assembly 92 to close the nail head 9. When the closing tab 12 moves in the distal direction, the closing pin 93 also moves in the distal direction, and drives the anvil 91 to move away from the cartridge assembly 92, thereby opening the nail head 9.

As shown in fig. 3 to 7, the closing switching mechanism includes a link assembly 4, a switching drive 7, and a closing lever assembly 5. The link assembly 4 includes a first lever 41 and a second lever 42, the second lever 42 being located at a proximal end side of the first lever 41, the first lever 41 including a first pivot portion 412 and a third pivot portion 413, the second lever 42 including 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 12, so that axial movement of the closing pull rod assembly 5 can drive axial movement of the closing pull piece 12. The switching drive member 7 is pivotally connected to the closing lever assembly 5, and the pivotal connection position of the switching drive member 7 and the closing lever assembly 5 is fixed in the axial direction of the stapler relative to the closing lever assembly 5. Here, the fixing in the axial direction of the stapler means: the position of the pivotal connection of the switching drive 7 and the closure bar assembly 5 is not displaced in the axial direction relative to the closure bar assembly 5. The switching drive 7 is movable in a first direction of movement and in a second direction of movement, which are two opposite directions.

In this embodiment, the linkage assembly 4 includes a first state and a second state, both of which are relatively balanced. The switching drive 7 comprises a first position area and a second position area. In the initial state, the link assembly 4 is in the first state, 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, and the switching drive 7 is in the first position area. When the driving nail head 9 needs to be closed, the switching driving piece 7 is driven to move towards the first moving direction, the closing pull rod assembly 5 is driven to move towards the first moving direction, the second pivoting portion 422 is driven to move towards the first moving direction, the third pivoting portion 413 and the fourth pivoting portion 423 move towards the third moving direction, the connecting rod assembly 4 enters the second state, at the moment, the connecting rod assembly 4 enters a relatively stretched state, the axial distance between the first pivoting portion 412 and the second pivoting portion 422 is increased, and meanwhile, the closing pull rod assembly 5 drives the closing pull piece 12 to move towards the first moving direction to close the nail head 9. When the switching drive 7 moves to the second position area, the closing of the nail head 9 is completed.

After the nail head 9 is closed, the connecting rod assembly 4 is in the second relatively stable state, the switching driving piece 7 is located in the second position area, at this time, under the action of the connecting rod assembly 4, the closing stability of the nail head 9 can be kept, the firing of the anastomat can be carried out, and the closing stability of the nail head 9 is not affected due to the unexpected movement of the closing pull tab 12 during the firing of the anastomat. When the nail head 9 needs to be opened after the percussion of the anastomat is finished, the switching driving piece 7 is operated to rotate relative to the closing pull rod assembly 5, the switching driving piece 7 drives the connecting rod assembly 4 in the fourth moving direction, the connecting rod assembly 4 can be driven to enter the first state from the second state, the second pivoting part 422 of the connecting rod assembly 4 drives the closing pull rod assembly 5 to move in the second moving direction, the closing pull rod assembly 5 can drive the switching driving piece 7 to move in the second moving direction and return to the first position area, and meanwhile, the closing pull rod assembly 5 drives the closing pull piece 12 to move in the far-end side direction so as to open the nail head 9, so that the manual opening of the nail head 9 can be realized, and the stapler is simple in structure and convenient to operate.

The structure and operation of the closing switching mechanism of this embodiment will be described in detail with reference to fig. 3 to 11. In this embodiment, the second location area is located on the proximal side of the first location area. The first moving direction and the second moving direction are directions along the axial direction of the anastomat. Specifically, the first movement direction is a proximal side direction (direction S1 in fig. 3) toward the stapler, and the second movement direction is a distal side direction (direction opposite to S1) toward the stapler. The switching drive member 7 is capable of driving the closed head portion when moving in the proximal direction from the first position region, and the switching drive member 7 is capable of driving the open head portion when moving in the distal direction from the second position region. The first position area refers to the position area where the switching driver 7 is located in the initial state as shown in fig. 7, and the second position area refers to the position area where the switching driver 7 is located after the closing of the nail head as shown in fig. 9 is completed.

As shown in fig. 3-7, the closure switching mechanism further includes a connecting rod 18. The closing tab 12 is inserted inside the connecting rod 18. In this embodiment, the third moving direction is a direction from bottom to top in the view of fig. 3, i.e., a direction toward the connecting rod 18 for the third pivot 413 and the fourth pivot 423. The fourth moving direction is a direction from top to bottom in the view of fig. 3, i.e. a direction away from the connecting rod 18 for the third pivot 413 and the fourth pivot 423. As shown in fig. 7, the structure of the closing switching mechanism in the initial state of this embodiment is schematically shown. In the state of fig. 7, the third pivot portion 413 and the fourth pivot portion 423 are located at a position relatively far from the connecting rod 18, the connecting rod assembly 4 is located at a relatively stable first state, and the axial distance between the first pivot portion 412 and the second pivot portion 422 is small. The switching drive 7 is in the first position region.

As shown in fig. 8, the switching driver 7 includes an operation portion 73, a first driving portion 72, a first outer sleeve portion 71, and a rotation engagement portion 75, and the operation portion 73 is connected to the first outer sleeve portion 71. The operation portion 73 is connected to the first outer jacket portion 71. The housing 13 is correspondingly provided with a containing groove for containing the operation part 73, and the operation part 13 partially enters the containing groove, can move relative to the containing groove and protrudes out of the outer surface of the housing 13 of the anastomat body 1 so as to be convenient for an operator to use. The first outer sleeve portion 71 is sleeved outside the closed pull rod assembly 5 and can move axially relative to the connecting rod 18. The first driving part 72 is located at a side of the first outer sleeve part 71 facing the connecting rod assembly 4, the rotary matching part 75 is disposed between the first driving part 72 and the first outer sleeve part 71, the rotary matching part 75 is pivotally connected to the closing rod assembly 5 through a rotary shaft 523, and the rotary matching part 75 is provided with a second matching hole 751 passing through the rotary shaft 523. The first driving portion 72 is a driving arm extending from the rotation engagement portion 75 toward the distal end side of the stapler, and the rotation engagement portion 75 is a bent portion connected between the first driving portion 72 and the first sheath portion 71. A fixed angle is provided between the first driving portion 72 and the first outer sleeve portion 71, that is, the rotation matching portion 75 is a bending portion that does not deform, preferably has a certain rigidity, so that an included angle (for example, a right angle, or an angle smaller than or larger than a right angle) between the first driving portion 72 and the first outer sleeve portion 71 is kept unchanged. A second driving part 411 is provided at the third pivot 413 of the first lever 41, the second driving part 411 including a mating surface facing the connecting lever 18. In the initial state, the second driving portion 411 is located at a position relatively far from the connecting rod 18 along with the third pivot portion 413, and does not contact the first driving portion 72, and the first driving portion 72 does not apply a force to the second driving portion 411.

As shown in fig. 3, 5 and 8, the closure tie bar assembly 5 includes a second outer sleeve portion 51 and a third driving portion 52. The second outer sleeve 51 is sleeved on the outer part of the connecting rod 18, the second outer sleeve 51 comprises a distal end part and a proximal end part, the outer diameter of the distal end part is smaller than that of the proximal end part, and a switching matching surface 513 is arranged between the distal end part and the proximal end part of the second outer sleeve 51. The distal end portion of the second outer sleeve portion 51 is at least partially penetrating the inside of the first outer sleeve portion 71 of the switching fitting 7, and the switching fitting surface 513 of the second outer sleeve portion 51 is fitted with the proximal end surface of the first outer sleeve portion 71. The distal end side of the second housing part 51 is provided with a through hole 511, and the distal end side of the second housing part 51 can be fixedly connected to the proximal end side of the closing tab 12 by a connecting pin 19 passing through the through hole 511 of the second housing part 51. The first end of the third driving part 52 is pivotally connected to the second pivot part 422 of the second lever 42, and the second end of the third driving part 52 is connected to the second housing part 51. The rotation shaft 523 is inserted into the third driving portion 52, and is pivotally connected to the rotation engagement portion 75 of the switching driver 7 via the rotation shaft 532. The side surface of the third driving part 52 is provided with one or two guide parts 521. The inner surface of the housing 13 of the stapler body 1 is provided with one or two guiding grooves extending in the axial direction, into which the guiding parts 521 at least partly enter and are movable in the direction of extension of the guiding grooves. The cooperation of the guide 521 and the guide groove limits the movement of the closing lever assembly 5 only in the axial direction. In other alternative embodiments, a guiding portion may be provided on the inner surface of the housing 13 of the anastomat body 1, and a guiding groove may be provided on the side of the third driving portion 52, which is also within the scope of the present invention.

As shown in fig. 4, 6 and 8, a stopper 14 is provided inside the housing 13 of the stapler body 1. A closing biasing member is provided between the closing lever assembly 5 and the stopper 14, and the closing biasing member provides a first biasing force to the closing lever assembly 5 in a distal direction. In this embodiment, the closing biasing means is a closing return spring 61 and may optionally be a compression spring arranged on the proximal side of the closing lever assembly 5. The second outer sleeve portion 51 of the closing rod assembly 5 is internally provided with a spring engagement step surface 512, and the closing return spring 61 is arranged between the spring engagement step surface 512 and the stop portion 14. In other alternative embodiments, the closing bias may also be a spring, a tension spring or other type of resilient member disposed on the distal side of the closing lever assembly 5.

In the state shown in fig. 7, the closing return spring 61 is substantially not deformed or only slightly deformed when the link assembly 4 is in the first state. The closing lever assembly 5 is held in the initial position by the first biasing force of the closing return spring 61 and holds the switching drive 7 in the first position region. The closing return spring 61 can further maintain the state stability of the closing switching mechanism when no external force acts.

In the state shown in fig. 7, the operation portion 73 of the switching driver 7 is operated so that the switching driver 7 moves from the first position region to the first moving direction, and the rotation engagement portion 75 of the switching driver 7 is axially fixed to the third driving portion 52 at the position of the rotation shaft 523, and therefore, the switching driver 75 can drive the third driving portion 52 to move in the first moving direction. And because the switching engagement surface 513 of the second outer sleeve part 51 is engaged with the proximal end surface of the first outer sleeve part 71, the first outer sleeve part 71 can also act on the switching engagement surface 513, thereby realizing that the switching driving member 7 applies a more uniform acting force to the closing rod assembly 5 in the proximal direction, and drives the closing rod assembly 5 to move in the first moving direction, namely, in the proximal direction of the anastomat. The closing rod assembly 5 drives the second pivot portion 422 to move in the first moving direction through the third driving portion 52. The third pivot portion 413 and the fourth pivot portion 423 move in a third moving direction, i.e., move upward to be close to the connecting rod 18, the first rod 41 rotates counterclockwise about the first pivot 43, the second rod 42 rotates clockwise about the third pivot 45, the link assembly 4 enters the second state, and the axial distance between the first pivot portion 412 and the second pivot portion 422 increases. At this time, the state of the closing switching mechanism is as shown in fig. 9. As can be seen from comparing fig. 9 and 7, the switch driving member 7 moves in the proximal direction to the second position area, and the closing lever assembly 5 compresses the closing return spring 61 to be elastically deformed. At the same time, the second sleeve part 51 drives the closing tab 12 to move in the proximal direction, closing the nail head 9, due to the movement of the third driving part 52 in the proximal direction. In the state of fig. 9, the first driving part 72 is located at a side of the second driving part 411 facing the connection rod 18, and there is a certain height gap between the surfaces of the first driving part 72 opposite to the second driving part 411 in the longitudinal direction (i.e., S2 direction), so that the first driving part 72 does not act on the second driving part 411. Here, a space between the surfaces of the first driving part 72 and the second driving part 411, that is, a space between the lower surface of the first driving part 72 and the upper surface of the second driving part 411. At this time, the link assembly 4 is in a second relatively stable state, and the closing link assembly 5 and the switching driver 7 are also in a relatively stable state under the action of the link assembly 4, so that the stability of the closed stud 9 is maintained. Holding the firing handle 3 at this point, the stapler can be fired by driving a rack (not shown) within the stapler body.

As shown in fig. 8 and 10, the third pivot portion 413 of the first lever 41 is provided with the second driving portion 411, the switching driving member 7 includes two first driving portions 72, and the second driving portion 411 includes two mating surfaces opposite to the two first driving portions 72, the two mating surfaces being located on the left and right sides of the fourth pivot portion 423, respectively. The two first driving portions 72 are symmetrically arranged relative to the axial direction of the anastomat, and are arranged corresponding to the two matching surfaces of the second driving portion 411. The guide portion 521 is a protruding strip provided on a side surface of the third driving portion 52, and one guide portion 521 may be provided on both left and right sides of the third driving portion 52. The distal end side of the third driving part 52 is provided with a first fitting hole 522 for mounting the third pin 45.

In other alternative embodiments, the number of first driving portions 72 is not limited to two, and for example, only one first driving portion 72 is provided. The mounting positions and the manner of the closing return spring 61 and the switching return spring 62 may also be different from this embodiment. In other alternative embodiments, the second driving portion 411 may be disposed at the fourth pivot portion 423 or at another position of the first lever 41 or the second lever 42. In other alternative embodiments, the guide 521 may be provided as a boss or other structure.

As shown in fig. 8 and 9, a switching bias member is disposed between the switching driving member 7 and the closing rod assembly 5, and when the switching driving member 7 rotates in a first rotation direction, the switching bias member elastically deforms to apply a second bias force to the switching driving member 7 rotating in a second rotation direction. When the switch driving member 7 is not subjected to external force, the proximal end surface of the switch driving member 7 at least partially abuts against the closing lever assembly 5, specifically, the proximal end surface of the first outer sleeve portion 71 of the switch driving member 7 at least partially abuts against the switch mating surface 513 of the second outer sleeve portion 51 of the closing lever assembly 5. Specifically, the surface of the first outer sleeve portion 71 of the switch driving member 7 is provided with a second spring mounting portion 74, the proximal end portion of the first outer sleeve portion 51 of the closing lever assembly 5 is provided with a first spring mounting portion 514, and the switch biasing member is one switch return spring 62, and may be a tension spring. Both ends of the switching return spring 62 are respectively attached to the first spring attaching portion 514 and the second spring attaching portion 74. In this embodiment, the first spring mounting portion 514 and the second spring mounting portion 74 are a boss protruding from a surface of the second outer sleeve portion 51 and a boss protruding from the first outer sleeve portion 71, respectively. But the present invention is not limited thereto. In other alternative embodiments, the switching bias member may be a torsion spring sleeved on the rotating shaft 523, or the switching bias member may be a tension spring or a compression spring, and both ends of the switching bias member are fixed at other positions of the switching drive member 7 and the closing pull rod assembly 5. In this embodiment, two of said switching biases are provided, symmetrically arranged with respect to the axial direction of the stapler, to act more uniformly on the switching drive 7. However, the present invention is not limited thereto, and in other alternative embodiments, for example, only one switching bias member or more switching bias members may be provided.

In the state shown in fig. 9, firing of the stapler can be performed by holding the firing handle 3. During the firing process of the anastomat, under the action of the stable state of the connecting rod assembly 4, the state of the closing pull rod assembly 5 and the state of the switching driving piece 7 are not changed, namely the connecting rod assembly 4 is kept in the second state, the switching driving piece 7 is kept in the second position area, and the closing pull piece 12 cannot accidentally and axially move, so that the head 9 of the nail is kept closed stably. When the stapling machine needs to open the staple head 9 after the completion of the firing, the operator operates the operation portion 73 protruding outside the housing 13 to drive the distal end side direction movement thereof, so that the switching drive member 7 rotates around the rotation shaft 523 with respect to the closing lever assembly 5, and the rotation direction is the first rotation direction. In this embodiment, the first rotation direction is the S3 direction shown in fig. 9, i.e., the counterclockwise direction in the view of fig. 9.

As shown in fig. 11, when the switching driver 7 rotates in the first rotation direction, the first driving portion 72 presses the second driving portion 411 in a direction away from the connecting rod 18, so that the second driving portion 411 drives the third pivot portion 413 and the fourth pivot portion 423 to move in the fourth movement direction, that is, in a direction away from the connecting rod 18, and the connecting rod assembly 4 enters the first state. During the return of the link assembly 4 from the second state to the first state, in the view of fig. 11, the first lever 41 rotates clockwise about the first pivot 43, the second lever 42 rotates counterclockwise about the second pivot 44, the second pivot 422 moves in the second moving direction, that is, in the distal direction of the stapler, and the second pivot 422 drives the third driving part 52 to move in the distal direction, thereby driving the switching driving part 7 to move in the distal direction to the first position region. At the same time, the second sheath portion 51 drives the closing tab 71 to move in the distal direction, and the nail head can be opened. The closing return spring 61 is also restored to the initial state, and the first biasing force of the closing return spring 61 further ensures that the closing lever assembly 5 can be returned to the initial position.

Therefore, after the anastomat is completely fired, the operating part 73 of the switching driving piece 7 is operated to move towards the distal end side, namely the connecting rod assembly 4 can be driven to enter the first state from the second state, and the closing pull rod assembly 5 is driven to move towards the distal end side so as to open the nail head 9, so that the manual opening of the nail head 9 can be realized, and the stapler is simple in structure and convenient to operate.

In the state of fig. 11, the switching return spring 62 (not shown) is elongated to be elastically deformed. At this time, the operator releases the operation portion 73, and the operation portion 73 loses the external force. Under the second biasing force of the switching return spring 62, the switching drive 7 is rotated again in the second rotational direction back to the initial position (i.e., the position and state of the switching drive 7 shown in fig. 7). In this embodiment, the second rotation direction is the S4 direction shown in fig. 11, i.e., the clockwise direction in the view of fig. 11.

As shown in fig. 12, in another embodiment of the present invention, the second driving portion of the link assembly 4 may be a protrusion 414 provided at the third pivot 413, and the protrusion 414 protrudes toward the connecting rod 18 with respect to the first rod 41. When the link assembly 4 is in the second state and the switching driver 7 is not rotated by an external force, a certain height gap exists between the lower surface of the first driving portion 72 and the top end of the protruding portion 414, and the switching driver 7 does not act on the protruding portion 414. When the link assembly 4 is in the second state and the switching driving member 7 rotates in the first rotation direction, the first driving portion 72 of the switching driving member 7 directly acts on the protruding portion 414, and applies a force to the protruding portion 414 away from the connecting rod 18, so that the link assembly 4 returns to the first state. In another alternative embodiment, the protruding portion 414 may be provided at the fourth pivot portion or other positions of the link assembly 4, and the shape of the protruding portion 414 is not limited to the shape shown in fig. 12. The other components of this embodiment are the same as those of the respective components of the embodiment shown in fig. 1 to 11, and will not be described again here.

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 (18)

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

the connecting rod assembly comprises a first pivoting part and a second pivoting part, the first pivoting part is pivotally connected to the anastomat body, and the connecting rod assembly comprises a first state and a second state;

the closed pull rod assembly is pivotally connected to the second pivot part;

the switching driving piece is pivotally connected to the closing pull rod assembly and can move along a first moving direction and a second moving direction, and the first moving direction is opposite to the second moving direction;

when the switching driving piece moves towards the first moving direction, the closing pull rod assembly is driven to move towards the first moving direction, so that the connecting rod assembly enters the second state from the first state; when the switching driving piece rotates along a first rotation direction relative to the closing pull rod assembly, the connecting rod assembly is driven to enter the first state, and the second pivoting part drives the closing pull rod assembly and the switching driving piece to move towards the second movement direction.

2. The closure switching mechanism of claim 1, wherein the switching drive comprises a first drive portion and a rotating mating portion pivotally connected to the closure tie bar assembly by a rotational axis, the linkage assembly comprising a second drive portion;

when the connecting rod assembly is in the second state and the switching driving piece rotates along the first rotation direction, the first driving part drives the second driving part, so that the connecting rod assembly enters the first state.

3. The closure switching mechanism of claim 2, further comprising a connecting rod, wherein the connecting rod assembly is in the second state and the first drive portion drives the second drive portion in a direction away from the connecting rod when the switching drive is rotated in a first rotational direction.

4. The closure switching mechanism of claim 3, wherein the linkage assembly comprises a first lever and a second lever, the second lever being located on a proximal side of the first lever, the first lever comprising the first pivot and a third pivot, the second lever comprising the second pivot and a fourth pivot, the third pivot being pivotally connected to the fourth pivot;

When the connecting rod assembly enters the second state from the first state, the third pivoting part and the fourth pivoting part move towards the connecting rod; when the switching driving piece rotates along the first rotation direction, the switching driving piece drives the third pivoting part and the fourth pivoting part to move towards a direction far away from the connecting rod.

5. The closure switching mechanism according to claim 4, wherein the second driving portion is disposed at the third pivot portion or the fourth pivot portion.

6. The closure switching mechanism of claim 3, wherein the first drive portion is located on a side of the second drive portion facing the connecting rod when the linkage assembly is in the second state, and wherein a height gap is provided between opposing surfaces of the first drive portion and the second drive portion.

7. The closure switching mechanism of claim 3, wherein the switching actuator further comprises a first outer sleeve portion, the closure tie assembly comprises a second outer sleeve portion and a third actuator portion, the first outer sleeve portion is disposed outside the second outer sleeve portion, the second outer sleeve portion is disposed outside the connecting rod, the third actuator portion is pivotally connected to the second pivot portion of the link assembly, and the second outer sleeve portion drives the link assembly from the first state to the second state when moving in the first direction of movement.

8. The closure switching mechanism of claim 7, wherein the first drive portion is a drive arm extending from the rotational engagement portion in the second direction of movement, the rotational engagement portion is a bent portion connected between the first outer sleeve portion and the first drive portion, and a fixed angle is provided between the first drive portion and the first outer sleeve portion.

9. The closure switching mechanism of claim 7, wherein the rotary engagement portion is pivotally connected to a third drive portion of the closure tie assembly via the rotary shaft.

10. The closure switching mechanism of claim 7, wherein the third drive portion of the closure pull rod assembly is provided with at least one guide portion, the inner surface of the housing of the stapler body is provided with at least one axially extending guide slot, or the third drive portion is provided with at least one axially extending guide slot, the inner surface of the housing of the stapler body is provided with at least one guide portion;

the guide portion enters the guide groove, and the guide portion is movable in an extending direction of the guide groove.

11. The closure switching mechanism of claim 7, wherein a closure biasing member is disposed between the second housing portion of the closure pull rod assembly and the stapler body, the closure biasing member imparting a first biasing force to the closure pull rod assembly in the second direction of movement.

12. The closure switching mechanism of claim 1, wherein a switching bias is disposed between the switching drive and the closure tie assembly, the switching bias deforming upon rotation of the switching drive relative to the closure tie assembly in a first rotational direction to impart a second biasing force to the switching drive to rotate in a second rotational direction, the second rotational direction being opposite the first rotational direction.

13. The closure switching mechanism of claim 12, wherein the switching bias member is a switching return spring, a first spring mounting portion is provided on the closure pull rod assembly, a second spring mounting portion is provided on the switching drive member, two ends of the switching return spring are respectively fixed on the first spring mounting portion and the second spring mounting portion, and a proximal end surface of the switching drive member is at least partially abutted against the closure pull rod assembly when no external force is applied.

14. The closure switching mechanism according to claim 7, wherein the switching drive member includes an operating portion provided to the first outer sheath portion and protruding from an outer surface of a housing of the stapler body, the housing being provided with a receiving groove for receiving the operating portion.

15. The closure switching mechanism of claim 1, further comprising a closure tab, a proximal side of the closure tab being connected to the closure tab assembly by a connecting pin.

16. The closure switching mechanism of claim 1, wherein the first and second directions of movement are along an axial direction of the stapler.

17. The closure switching mechanism of claim 16, wherein the first direction of movement is toward a proximal side of the stapler and the second direction of movement is toward a distal side of the stapler.

18. A medical stapler comprising a closure switching mechanism according to any one of claims 1 to 17.

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