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 can move relative to the anastomat body along a first direction and a second direction, the first direction and the second direction are opposite and are the axial direction of the anastomat, the switching driving piece is fixed relative to the closing pull rod assembly in the axial direction, the switching driving piece can move relative to the closing pull rod assembly in a third direction, and a fixed included angle is formed between the third direction and the first direction or the second direction;
When the switching driving piece moves towards the first direction, the closing pull rod assembly is driven to move towards the first direction, so that the connecting rod assembly enters the second state from the first state; when the switching driving piece moves along the third 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 direction.
In some embodiments, the included angle is a right angle and the switch drive moves in an up and down direction relative to the closure tie assembly.
In some embodiments, the first direction is toward a proximal side of the stapler and the second direction is toward a distal side of the stapler.
In some embodiments, the switch drive includes a first drive portion and a connection mating portion that is fixed in the axial direction relative to the closure bar assembly and movable in the third direction relative to the closure bar assembly, the link assembly including a second drive portion;
The connecting rod assembly is in the second state, and when the switching driving piece moves relative to the closing pull rod assembly in the third direction, the first driving part drives the second driving part in the third direction, so that the connecting rod assembly enters the first state.
In some embodiments, the third direction is a direction toward or away from the connecting rod;
The connecting rod assembly comprises a first rod and a second rod, the second rod is positioned at the proximal end side of the first rod, the first rod comprises a first pivoting part and a third pivoting part, the second rod comprises a second pivoting part and a fourth pivoting part, and the third pivoting part is pivotally connected to the fourth pivoting part;
The connecting rod assembly is in the second state, and 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 when moving relative to the closing pull rod assembly in the third direction.
In some embodiments, the switching driving piece further includes a first connecting portion, the closing rod assembly includes a second outer sleeve portion and a third driving portion, the first connecting portion is movably connected to the second outer sleeve portion, the second outer sleeve portion is sleeved outside the connecting rod, and the third driving portion is pivotally connected to the second pivoting portion of the connecting rod assembly.
In some embodiments, the first connection portion is a first outer sleeve portion, and the first connection portion is sleeved on the second outer sleeve portion.
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.
In some embodiments, the third drive portion includes a first cavity into which the second rod at least partially enters.
In some embodiments, the connection mating portion is provided with a chute extending in the third direction, the closure pull rod assembly is provided with a post, or the closure pull rod assembly is provided with a chute extending in the third direction, the connection mating portion is provided with a post;
The convex column at least partially enters the inside of the chute and can move along the extending direction of the chute.
In some embodiments, the switching driving piece further comprises an operation part, the operation part is arranged on the first connecting part 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 operation part.
In some embodiments, a switching bias is disposed between the switching drive and the closure tie assembly, the switching bias imparting a second biasing force to the switching drive in a fourth direction, the fourth direction being opposite the third direction.
In some embodiments, the switch driver is provided with a runner extending in the third direction, the closure tie bar assembly is provided with a post, the switch driver is provided with a spring fit, or the closure tie bar assembly is provided with a runner extending in the third direction, the switch driver is provided with a post;
The convex column at least partially enters the sliding groove, and can move along the extending direction of the sliding groove, and two ends of the switching biasing piece are respectively arranged at the convex column and the spring matching part.
In some embodiments, the third direction is a direction away from the connecting rod, 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 switch drive member moves relative to the closure tie rod assembly in the third direction, such that the third pivot portion and the fourth pivot portion move in a direction away from the connecting rod.
In some embodiments, the second driving portion is disposed at the third pivot portion and/or the fourth pivot portion.
In some embodiments, the third pivot portion and the fourth pivot portion are pivotally connected by a second pin shaft, the second driving portion is integrally disposed with the second pin shaft, and the second driving portion protrudes from surfaces of the third pivot portion and the fourth pivot portion.
In some embodiments, the switching drive further comprises a first outer sleeve portion, the closing tie bar assembly comprises a second outer sleeve portion sleeved outside the connecting bar, the first outer sleeve portion is sleeved outside the second outer sleeve portion, and the first drive portion is located on the distal end side of the connecting mating 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 surface of the side of the first driving portion facing the second driving portion is a plane parallel to the axial direction.
In some embodiments, the switching driving piece includes two first driving parts, the connecting rod assembly includes two second driving parts, and the two first driving parts are respectively located at two sides of the connecting rod assembly and are respectively opposite to the positions of the two second driving parts.
In some embodiments, the third direction is a direction toward the connecting rod, the connecting rod assembly is in the second state, and the first driving portion drives the second driving portion in a direction toward the connecting rod when the switching driving member moves in the third direction relative to the closing tie rod assembly, such that the third pivoting portion and the fourth pivoting portion move in a direction away from the connecting rod.
In some embodiments, the second pivoting portion is rotatably connected with the closing pull rod assembly through a third pin shaft, the second driving portion is disposed at the second pivoting portion, and the second driving portion and the fourth pivoting portion are respectively located at two sides of the third pin shaft;
When the connecting rod assembly is in the second state, the second driving part is located on one side, facing the connecting rod, of the first driving part, and when the switching driving piece moves along the third direction, the first driving part drives the second driving part along the third direction, so that the second rod rotates around the third pin shaft, and the fourth pivoting part and the third pivoting part move along a direction away from the connecting rod.
In some embodiments, the switching drive includes two sidewalls, the two sidewalls being located on opposite sides of the third drive portion, respectively, and the first drive portion is a fourth pin connected between the two sidewalls of the switching drive.
In some embodiments, when the connecting rod assembly is in the first state, the second driving part is positioned at one side of the first driving part facing the connecting rod, a height gap is formed between the surface of the second driving part opposite to the first driving part, a matching groove is formed in one side of the second driving part away from the connecting rod, and when the connecting rod assembly is in the second state, the first driving part at least partially enters the matching groove.
In some embodiments, the switch driver further comprises a first outer sleeve portion, the closure tie rod assembly comprises a second outer sleeve portion, the first outer sleeve portion and the second outer sleeve portion are respectively sleeved outside the connecting rod, and the first outer sleeve portion is located on the proximal side of the second outer sleeve 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.
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 by 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 the first direction to close a nail head when the switching driving piece moves along the first direction along the axial direction, and can drive the closing pull rod assembly to move along the second direction to open the nail head when the switching driving piece moves along the third direction relative to the closing pull rod assembly.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.
FIG. 1 is a schematic view of a stapler according to a first embodiment of the invention;
FIG. 2 is a schematic view of the structure of the nail head of the first embodiment of the present invention;
FIG. 3 is a schematic view of the stapler body with one side housing removed, according to a first embodiment of the present invention;
FIG. 4 is a schematic view of the structure of a closing switching mechanism according to the first embodiment of the present invention;
Fig. 5 is a perspective view of a closure switching mechanism of a first embodiment of the present invention;
FIG. 6 is a schematic structural view of the connecting rod assembly in a first state according to the first embodiment of the present invention;
FIG. 7 is a schematic view of the structure of the closing switching mechanism when the link assembly of the first embodiment of the present invention is in the first state;
FIG. 8 is an exploded view of the closure switching mechanism of the first embodiment of the present invention;
FIG. 9 is a schematic structural view of the connecting rod assembly in the second state according to the first embodiment of the present invention;
FIG. 10 is a schematic view of the closed switching mechanism when the linkage assembly of the first embodiment of the present invention is in the second state;
FIG. 11 is a schematic view showing the structure of the switching mechanism when the nail head is opened in the first embodiment of the present invention;
FIG. 12 is a schematic view of a closed switching mechanism when the linkage assembly of the second embodiment of the present invention is in the first state;
FIG. 13 is a schematic view of a closure tie bar assembly in a second state of the link assembly of the second embodiment of the present invention;
FIG. 14 is a perspective view of a closure tie assembly of a second embodiment of the present invention;
FIG. 15 is an exploded view of a closure tie assembly of a second embodiment of the present invention;
Fig. 16 is a schematic structural view of a closing switching mechanism when the nail head of the second embodiment of the present invention is opened.
Reference numerals:
1. Stapler body 511 through hole
11. Bottom of second outer sleeve portion of fixed handle 515
12. Third driving part of closing pull-tab 52
13. Guide part of housing 521
131. Guide slot 522 mating hole
14. Stop 524 first cavity
18. Convex column of connecting rod 53
19. The connecting pin 61 closes the return spring
3. Firing handle 62 switches reset spring
4. Connecting rod assembly 7 switching driving piece
41. First rod 71 first outer sleeve portion
412. First pivot portion 72 first driving portion
413. Operating part of the third pivot part 73
42. Second rod 74 spring mounting portion
422. The second pivot 75 is connected to the mating part
423. Fourth pin joint part 751 chute
424. First section of abdication groove 7511
425. Second section of the mating groove 7512
43. First pin 9 head part
44. Second pin 91 nail anvil
45. First matching groove of third pin shaft 911
46. Second drive portion 92 cartridge assembly
5. Second mating groove of closing pull rod assembly 921
51. Second jacket portion 93 closing pin
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 different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary 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 closing switching mechanism comprises a connecting rod assembly, a closing pull rod assembly and a switching driving piece, wherein 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, the connecting rod assembly comprises a first state and a second state, the closing pull rod assembly is pivotally connected to the second pivoting part, the switching driving piece can move relative to the anastomat body along a first direction and a second direction, the first direction is opposite to the second direction and is the axial direction of the anastomat, the switching driving piece is fixed relative to the closing pull rod assembly in the axial direction, the switching driving piece can move relative to the closing pull rod assembly in a third direction, and a fixed included angle is formed between the third direction and the first direction or the second direction.
When the nail head of the anastomat needs to be closed, the switching driving piece is operated to move towards the first direction, the closing pull rod assembly is driven to move towards the first 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 moves along the third 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 the second 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, a first embodiment of the present invention provides a closing switching mechanism for a medical stapler and a medical stapler including the closing 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 driving member 7, and a closing pull rod 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 a second pin shaft, the second pivot portion 422 is pivotally connected to the closing pull rod assembly 5 through a 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 driving piece 7 is fixed relative to the closing pull rod assembly 5 in the axial direction of the anastomat, and the switching driving piece 7 can move relative to the closing pull rod assembly 5 along a third direction, and a fixed included angle is formed between the third direction and the first direction or the second direction. By axially fixed in the stapler is meant that the switching drive 7 is not axially displaced relative to the closing lever assembly 5. The switching drive 7 is movable in a first direction and a second direction, which are two opposite directions. And the closing lever assembly 5 moves axially together with the switch drive 7 when the switch drive 7 moves axially.
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. As shown in fig. 6 and 7, in the initial state, the link assembly 4 is in the first state, the link assembly 4 is in a relatively compact state, that is, 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 region. When the nail head 9 needs to be driven to be closed, the switching driving piece 7 is driven to move towards the first direction, the closing pull rod assembly 5 is driven to move towards the first direction, the second pivoting portion 422 is driven to move towards the first direction, the third pivoting portion 413 and the fourth pivoting portion 423 are rotated relatively, and the connecting rod assembly 4 enters the second state. As shown in fig. 9 and 10, the link assembly 4 is in a relatively stretched state, the axial distance between the first pivoting portion 412 and the second pivoting portion 422 increases, and the first pivoting portion 412 is not displaced in the axial direction relative to the stapler body 1. Simultaneously, the closing pull rod assembly 5 drives the closing pull piece 12 to move towards the first direction so as 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 anastomat is triggered, the switching driving piece 7 is operated to move along a third direction relative to the closing pull rod assembly 5 to drive the connecting rod assembly 4 to enter a first state from a second state, the second pivoting part 422 of the connecting rod assembly 4 drives the closing pull rod assembly 5 to move along a second direction, the closing pull rod assembly 5 can drive the switching driving piece 7 to move along the second direction and return to a first position area, and meanwhile, the closing pull rod assembly 5 drives the closing pull piece 12 to move along a far-end side direction 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 direction and the second direction are both directions along the axial direction of the anastomat. Specifically, the first direction is a proximal side direction (S1 direction in fig. 3) toward the stapler, and the second direction is a distal side 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. 10 is completed.
As shown in fig. 3 to 7, the closing switching mechanism further includes a connecting rod 18. The closing tab 12 is inserted inside the connecting rod 18. In this embodiment, the third 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 portion 413 and the fourth pivot portion 423. The included angle between the third direction and the first direction is a right angle, and the switching driving piece 7 moves up and down relative to the closing pull rod assembly 5. A fourth direction is defined herein, which 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 third direction and the fourth direction are both directions perpendicular to the axial direction of the stapler, defined herein as longitudinal, and the two directions are opposite. 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. 7 and 8, the switching driver 7 includes an operation portion 73, a first driving portion 72, a first connection portion, and a connection fitting portion 75. The operation portion 73 is connected to the first connection portion. In this embodiment, the first connection portion is a first outer sleeve 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 portion 72 and the connection fitting portion 75 are located on a side of the first outer jacket portion 71 toward the link assembly 4, and the connection fitting portion 75 is located on a proximal end side of the first driving portion 72. The third pivot 413 of the first lever 41 is provided with a second driving part 46. In the initial state, the second driving portion 46 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 46. In this embodiment, the second driving portion 46 is integrally disposed with the second pin, that is, the second driving portion 46 is partially disposed through the third pivot portion 413 and the fourth pivot portion 423, so that the third pivot portion 413 and the fourth pivot portion 423 are pivotally connected, and the second driving portion 46 partially protrudes from the outer surfaces of the third pivot portion 413 and the fourth pivot portion 423 and is disposed opposite to the first driving portion 72.
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. Preferably, the proximal end surface of the first outer sleeve portion 71 and the switching mating surface 513 of the second outer sleeve portion 51 abut against each other. 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 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 131, the guiding grooves 131 extending in the axial direction, the guiding parts 521 at least partly entering the guiding grooves 131 and being movable in the extending direction of the guiding grooves 131. Only movement of the closure tie bar assembly 5 in the axial direction is limited by the cooperation of the guide 521 and the guide slot 131. 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. 7 and 8, the switching drive 7 and the switching drive 5 are connected by the engagement of a stud and a chute. Specifically, the connection mating portion 75 is provided with a sliding groove 751, the sliding groove 751 extends along a third direction, the third driving portion 52 is provided with a protruding column 53, and the protruding column 53 at least partially enters the inside of the sliding groove 751 and is movable along the extending direction of the sliding groove 751, i.e. the protruding column 53 is movable relative to the sliding groove 751 along the longitudinal direction of the stapler. The chute 751 comprises a first section 751 and a second section 751, the first section 7511 being located below the second section 7512. In the initial state shown in fig. 7, the boss 53 is located at the first section 751 of the slide slot 751. When the switching drive 7 is operated to move downward by the operating portion 73, the boss 53 enters the second section 751 of the slide groove 751. In another alternative embodiment, the boss 53 may be disposed on the second outer sleeve part 51, and in yet another embodiment, a boss may be disposed on the connection mating part 75, and the third driving part 52 or the second outer sleeve part 51 may be disposed with a sliding slot extending in a third direction, and the boss may at least partially enter the sliding slot.
As shown in fig. 3 and 7, a stopper 14 is provided inside the housing 13 of the stapler body 1, and the stopper 14 is located on the proximal end side of the second sheath 51. 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 optionally a compression spring arranged between the second outer sleeve part 51 of the closing lever assembly 5 and the stop part 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 in the proximal direction from the first position area, and the slide groove 751 of the connection engagement portion 75 of the switching driver 7 engages with the boss 53 to drive the third driver 52 to move in the proximal direction. And because the switch mating surface 513 of the second outer sleeve part 51 mates with the proximal end surface of the first outer sleeve part 71, the first outer sleeve part 71 may also act on the switch mating surface 513, thereby enabling the switch driver 7 to apply a more uniform force to the closing lever assembly 5 in the proximal direction, driving the closing lever assembly 5 in the first direction, i.e. in the proximal direction of the stapler. The closing pull rod assembly 5 drives the second pivot portion 422 to move in the first direction through the third driving portion 52. The third pivot portion 413 and the fourth pivot portion 423 move in a fourth direction, i.e., move upward to be close to the connection 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 link assembly 4 is shown in fig. 9, and the state of the closing switching mechanism is shown in fig. 10. As can be seen from a comparison of fig. 10 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. 10, the first driving portion 72 is located on the side of the second driving portion 46 facing the connecting rod 18, and a certain height gap is preferably provided between the surfaces of the first driving portion 72 opposite to the second driving portion 46 in the longitudinal direction (i.e., S2 direction), so that the first driving portion 72 does not act on the second driving portion 46. Here, a space between the surfaces of the first driving part 72 and the second driving part 46, that is, a space between the lower surface of the first driving part 72 and the upper surface of the second driving part 46. 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, the third pivot portion 413 of the first lever 41 is provided with the second driving portion 46, and the switching driving member 7 includes two first driving portions 72, and the two first driving portions 72 are symmetrically disposed with respect to the axial direction of the stapler. The two ends of the second driving portion 46 protrude from the outer surfaces of the left and right sides of the pivot portion 413, and are disposed opposite to the two first driving portions 72. The side of the first drive section 72 facing the second drive section 46 is preferably a plane parallel to the axial direction. 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. The third drive portion 52 includes a first cavity 524 and the second rod 42 at least partially enters the first cavity 524 of the third drive portion 52. Further, a side of the second rod 42 facing the connecting rod 18 is provided with a relief groove 424, and when the connecting rod assembly 4 is in the second state, a bottom 515 of the second housing part 51 partially enters the relief groove 424.
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 46 may be disposed at the fourth pivot portion 423, or disposed at another position of the first rod 41 or the second rod 42, so long as the second driving portion 46 may move downward while driving the third pivot portion 413 and the fourth pivot portion 423 to move downward, or the second driving portion 46 may not be integrally disposed with the second pin, but may be separately disposed with one second pin and one or more second driving portions 46. In other alternative embodiments, the guide 521 may be provided as a boss or other structure.
As shown in fig. 8 and 10, a switching bias member is disposed between the switching driving member 7 and the closing pull rod assembly 5, and when the switching driving member 7 moves in the third direction, the switching bias member elastically deforms to apply a second bias force to the switching driving member 7 along the fourth direction. Specifically, a spring mounting portion 74 is provided on a surface of the connection mating portion 75 of the switching driving member 7, the closing lever assembly 5 is provided with a boss, and the switching biasing member is a switching return spring 62, and may be a tension spring. Both ends of the switching return spring 62 are respectively mounted to the spring mounting portion 74 and the boss. In this embodiment, the boss provided on the closing lever assembly 5 is the boss 53 engaged with the slide groove 751, the spring mounting portion 74 is a cylinder provided on the connection engaging portion 75, and the spring mounting portion 74 is located below the boss 53. Both ends of the switching return spring 62 are hung on the boss 53 and the spring engaging portion 74, respectively. 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 other alternative embodiments, the spring mount and post 53 provided on the closure tie assembly 53 may be two separate, independent pieces. In another alternative embodiment, the switching bias member is a tension spring or a compression spring, and both ends are fixed to the switching drive member 7 and the other positions of the closing rod assembly 5.
In the state shown in fig. 10, 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.
As shown in fig. 11, when the stapling head 9 needs to be opened after the stapling is completed, the operator operates the operation portion 73 protruding outside the housing 13 to drive it to move in the third direction, that is, in the view of fig. 10, the switching driver 7 is driven to move downward (move in the direction opposite to the S2 direction), the first driving portion 72 presses the second driving portion 46 in the direction away from the connecting rod 18 (in the third direction), so that the second driving portion 46 drives the third pivoting portion 413 and the fourth pivoting portion 423 to move in the direction away from the connecting rod 18, and the connecting rod assembly 4 enters the first state. In the process of returning 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 pivoting portion 422 moves in the second direction, that is, in the distal direction of the stapler, and the second pivoting portion 422 drives the third driving portion 52 to move in the distal direction. Since the closing lever assembly 5 and the switching drive 7 are axially fixed relative to each other by the projection 53 and the slot 751 and the switching mating face 513 of the closing lever assembly 5 abuts against the proximal face of the switching drive 7, the closing lever assembly 5 in turn drives the switching drive 7 also 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. At this time, the state of the closing switching mechanism is as shown in fig. 11.
Therefore, after the anastomat is completely fired, the operating part 73 of the switching driving piece 7 is operated to move towards the third direction, namely the connecting rod assembly 4 can be driven to enter the first state from the second state, the closing pull rod assembly 5 is driven to move towards the distal side direction, so that the nail head 9 is opened, and the manual opening of the nail head 9 can be realized.
In the state of fig. 11, the slide groove 751 as a whole moves downward with respect to the boss 53, and the boss 53 enters the second section 751 of the slide groove 751. The distance between the boss 53 and the spring mounting portion 74 increases, and the switching return spring 62 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 again moved in the fourth direction (i.e. moved upwards) back to the initial position (i.e. the position and state of the switching drive 7 shown in fig. 7), the stud 53 re-enters the first section 751 of the slide slot 751.
Fig. 12 to 16 are schematic structural views of a closing switching mechanism according to a second embodiment of the present invention. This embodiment differs from the first embodiment in that in the second embodiment the direction of movement of the switching drive 7 when driving the staple head 9 open is different from the first embodiment. In the second embodiment, the definition of the third direction and the fourth direction is opposite to the first embodiment. In the view angle of fig. 12, the S2 direction is a third direction, i.e., an upward direction, and the direction opposite to the S2 direction is a fourth direction, i.e., a downward direction. When the link assembly 4 is in the second state and the switching driving member 7 moves in the third direction, the switching driving member 7 lifts the second driving portion 72 upward, so that the third pivot portion 413 and the fourth pivot portion 423 move downward (move in the fourth direction) and move away from the connecting rod 18, and enter the first state.
The structure and operational aspects of the closing switching mechanism of the second embodiment are described in detail below with reference to fig. 12 to 16. As shown in fig. 12, a schematic structural view of the closing switching mechanism when the link assembly 4 of this embodiment is in the first state is shown. In this embodiment, the switching drive 7 is located in the first position region. The switching drive 7 is located on the proximal end side of the second housing part 51, and the relative positions of the switching drive 7 and the closing lever assembly 5 in the axial direction are not changed. The first sleeve part 71 of the switching driving piece 7 is sleeved outside the connecting rod 18, and the connecting matching part 75 of the switching driving piece 7 and the third driving piece 5 are axially fixed relatively through the connection of the sliding groove 751 and the convex column 53. The boss 53 is located in a second section 751 (identified in fig. 15) of the slide slot 751, and the spring mount 74 is located above the boss 53. In the state of fig. 12, the switching driver 7 is driven to move in the proximal direction to the second position region by the operation portion 73, the closing lever assembly 5 is driven to move in the proximal direction, the third driving portion 52 drives the second pivoting portion 422 to move in the proximal direction, the link assembly 4 is driven to enter the first state, the second housing portion 51 compresses the closing return spring 61 to generate elastic deformation, and the closing tab 12 is driven to move in the proximal direction to close the head of the nail. At this time, the closing switching mechanism is in a state as shown in fig. 13.
As shown in fig. 14 and 15, in the second embodiment, the second driving portion 46 is disposed at the second pivot portion 422, and the second driving portion 46 and the fourth pivot portion 423 are respectively located at both sides of the third pin 45. In this embodiment, the second drive 46 is therefore no longer provided integrally with the second pin 44. As shown in fig. 14, the second driving part 46 is located at the proximal end side of the third pin 45, the fourth pivot part 423 is located at the distal end side of the third pin 45, and the second lever 42 forms a lever structure rotatable with respect to the third pin 45. Accordingly, when the link assembly 4 is moved from the first state to the second state, the fourth pivot portion 423 moves toward the connecting rod 18, and the second pivot portion 422 rotates clockwise with respect to the third pin 45, so that the second driving portion 46 moves away from the connecting rod 18. When the second driving portion 46 moves in a direction approaching the connecting rod 18, the second pivot portion 422 rotates counterclockwise relative to the third pin 45, so that the fourth pivot portion 423 moves in a direction away from the connecting rod 18.
As shown in fig. 14 and 15, in the second embodiment, the switching driving member 7 includes two side walls, which are respectively located at two sides of the third driving portion 52, and the first driving portion 72 is a fourth pin connected between the two side walls of the switching driving member 7. The second driving part 46 is provided with a mating groove 425 at a side thereof remote from the connecting rod. When the connecting rod assembly 4 is in the first state, the second driving portion 46 is located on a side of the first driving portion 72 facing the connecting rod 18, and a certain height gap is formed between the lower surface of the second driving portion 46 and the upper surface of the first driving portion 72, so that the first driving portion 72 does not act on the second driving portion 46. When the link assembly 4 is in the second state, the first driving portion 72 at least partially enters the engagement groove 425 to form a relatively stable engagement with the second driving portion 46.
In the state of fig. 13, when it is required to open the nail head 9 of the stapler, the operator lifts the operation part 73 upward to drive the operation part 73 to move upward in the third direction, the first driving part 72 lifts the second driving part 46 upward so that the second driving part 46 moves toward the connecting rod 18, the second pivoting part 422 rotates counterclockwise around the third pin shaft 45 so that the fourth pivoting part 423 and the third pivoting part 413 move away from the connecting rod 18, the connecting rod assembly 4 enters the first state again, the second pivoting part 422 drives the third driving part 52 to move in the distal direction, and the closing pull rod assembly 5 further drives 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. At this time, the state of the closing switching mechanism is as shown in fig. 16.
Therefore, after the anastomat is completely fired, the operating part 73 of the switching driving piece 7 is operated to move towards the third direction, namely the connecting rod assembly 4 can be driven to enter the first state from the second state, the closing pull rod assembly 5 is driven to move towards the distal side direction, so that the nail head 9 is opened, and the manual opening of the nail head 9 can be realized.
In the state of fig. 16, the entire slide groove 751 moves upward with respect to the boss 53, and the boss 53 enters the first section 7511 (shown in fig. 15) of the slide groove 751. The distance between the boss 53 and the spring mounting portion 74 increases, and the switching return spring 62 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 again moved in the fourth direction (i.e. moved downwards) back to the initial position (i.e. the position and state of the switching drive 7 shown in fig. 12), the stud 53 re-enters the second section 751 of the slide slot 751.
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.