Closed switching mechanism and medical stapler

Abstract

The present invention provides a closing switching mechanism and a medical stapler, the mechanism comprising: a connecting rod assembly, comprising a first pivotal portion pivotally connected to the stapler body; a closing rod assembly, pivotally connected to the second pivotal portion of the connecting rod assembly; and a switching drive member, movable in a first direction and a second direction. The switching drive member is axially fixed relative to the closing rod assembly, and is movable in a third direction relative to the closing rod assembly, with a fixed angle being provided between the third direction and the first or second direction. When the switching drive member moves toward the first direction, it drives the closing rod assembly to move in the first direction, causing the connecting rod assembly to enter the second state from the first state; when the switching drive member moves relative to the closing rod assembly in the third direction, it drives the connecting rod assembly to enter the first state, and the second pivotal portion drives the closing rod assembly and the switching drive member to move in the second direction. The present invention can realize manual closing and manual opening of the nail head.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a closing switching mechanism and a medical stapler. Background Art

[0002] The medical stapler includes a medical stapler body, a firing handle movably connected to the medical stapler body, and a staple head that cooperates with the body. The staple head includes a stapler assembly and an anvil that are arranged relatively to each other. During surgery, the operator first holds the firing handle and pulls the closing tab toward the proximal side of the stapler through the closing switching mechanism, thereby closing the stapler assembly and the anvil, that is, closing the staple head. Then, the operator holds the firing handle again to push the staples toward the tissue, and the tissue is anastomosed by the formation of the staples in the stapler assembly at the anvil. At the same time, the cutter moves toward the distal side to cut the tissue, thereby firing the stapler. The existing closing switching mechanism has a relatively complex structure, and after the stapler is fired, the staple head may be difficult to open, which brings inconvenience to the operator.

[0003] In the present invention, the distal side and the proximal side are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical site is the distal side. Summary of the Invention

[0004] In view of the problems in the prior art, the purpose of the present invention is to provide a closing switching mechanism and a medical stapler, which can realize manual closing and manual opening of the nail head by operating the switching driving member to move in different directions.

[0005] An embodiment of the present invention provides a closing switching mechanism for a medical stapler, the closing switching mechanism comprising:

[0006] A connecting rod assembly includes a first pivot portion and a second pivot portion, wherein the first pivot portion is pivotally connected to the stapler body, and the connecting rod assembly includes a first state and a second state;

[0007] a closing pull rod assembly pivotally connected to the second pivot portion;

[0008] a switching drive member, movable relative to the stapler body in a first direction and a second direction, the first direction and the second direction being opposite and being the axial direction of the stapler, the switching drive member being fixed relative to the closing rod assembly in the axial direction, and the switching drive member being movable relative to the closing rod assembly in a third direction, the third direction being provided with a fixed angle with respect to the first direction or the second direction;

[0009] When the switching drive moves toward the first direction, it drives the closing rod assembly to move toward the first direction, so that the connecting rod assembly enters the second state from the first state; when the switching drive moves along the third direction relative to the closing rod assembly, it drives the connecting rod assembly to enter the first state, and the second pivot portion drives the closing rod assembly and the switching drive to move in the second direction.

[0010] In some embodiments, the angle is a right angle, and the switching drive member moves in an up and down direction relative to the closing pull rod assembly.

[0011] In some embodiments, the first direction is toward the proximal side of the stapler, and the second direction is toward the distal side of the stapler.

[0012] In some embodiments, the switching drive member includes a first driving portion and a connecting fitting portion, the connecting fitting portion is fixed relative to the closing rod assembly in the axial direction and is movable relative to the closing rod assembly in the third direction, and the connecting rod assembly includes a second driving portion;

[0013] The connecting rod assembly is in the second state, and when the switching drive member moves in the third direction relative to the closing pull rod assembly, the first drive portion drives the second drive portion along the third direction, so that the connecting rod assembly enters the first state.

[0014] In some embodiments, a connecting rod is further included, and the third direction is a direction toward the connecting rod or a direction away from the connecting rod;

[0015] The connecting rod assembly includes a first rod and a second rod, the second rod is located at the proximal end side of the first rod, the first rod includes the first pivot portion and the third pivot portion, the second rod includes the second pivot portion and the fourth pivot portion, and the third pivot portion is pivotally connected to the fourth pivot portion;

[0016] When the connecting rod assembly enters the second state from the first state, the third pivotal portion and the fourth pivotal portion move toward the connecting rod; when the connecting rod assembly is in the second state and the switching drive member moves in the third direction relative to the closing pull rod assembly, the switching drive member drives the third pivotal portion and the fourth pivotal portion to move in a direction away from the connecting rod.

[0017] In some embodiments, the switching drive member also includes a first connecting portion, the closing pull rod assembly includes a second outer sleeve and a third driving portion, the first connecting portion is movably connected to the second outer sleeve, the second outer sleeve is mounted on the outside of the connecting rod, and the third driving portion is pivotally connected to the second pivot portion of the connecting rod assembly.

[0018] In some embodiments, the first connecting portion is a first outer sleeve portion, and the first connecting portion is sleeved on the second outer sleeve portion.

[0019] In some embodiments, a closing biasing member is provided between the second outer sleeve of the closing rod assembly and the stapler body, and the closing biasing member applies a first biasing force to the closing rod assembly toward the second direction.

[0020] In some embodiments, the third driving portion includes a first cavity, and the second rod at least partially enters the first cavity.

[0021] In some embodiments, the connecting portion is provided with a sliding groove extending along the third direction, and the closing pull rod assembly is provided with a protruding column, or the closing pull rod assembly is provided with a sliding groove extending along the third direction, and the connecting portion is provided with a protruding column;

[0022] The protrusion at least partially enters the interior of the sliding groove and can move along the extension direction of the sliding groove.

[0023] In some embodiments, the switching drive member further includes an operating portion, which is disposed on the first connecting portion and protrudes from an outer surface of a shell of the stapler body, and the shell is provided with an accommodating groove for accommodating the operating portion.

[0024] In some embodiments, a switching biasing member is provided between the switching driving member and the closing pull rod assembly, and the switching biasing member applies a second biasing force along a fourth direction to the switching driving member, and the fourth direction is opposite to the third direction.

[0025] In some embodiments, the switching drive member is provided with a sliding groove extending along the third direction, the closing pull rod assembly is provided with a protruding column, and the switching drive member is provided with a spring engaging portion, or the closing pull rod assembly is provided with a sliding groove extending along the third direction, and the switching drive member is provided with a protruding column;

[0026] The protruding column at least partially enters the interior of the sliding slot and can move along the extending direction of the sliding slot. The two ends of the switching biasing member are respectively arranged on the protruding column and the spring matching portion.

[0027] In some embodiments, the third direction is the direction away from the connecting rod, the connecting rod assembly is in the second state, and when the switching drive member moves in the third direction relative to the closing pull rod assembly, the first drive part drives the second drive part in the direction away from the connecting rod, so that the third pivot part and the fourth pivot part move in the direction away from the connecting rod.

[0028] In some embodiments, the second driving portion is disposed on the third pivoting portion and / or the fourth pivoting portion.

[0029] In some embodiments, the third pivotal portion and the fourth pivotal portion are pivotally connected via a second pin shaft, the second driving portion is integrally provided with the second pin shaft, and the second driving portion protrudes from the surfaces of the third pivotal portion and the fourth pivotal portion.

[0030] In some embodiments, the switching drive member also includes a first outer sleeve, the closing pull rod assembly includes a second outer sleeve, the second outer sleeve is sleeved on the outside of the connecting rod, and the first outer sleeve is sleeved on the outside of the second outer sleeve; the first driving part is located on the distal side of the connecting mating part.

[0031] 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 first driving portion facing the second driving portion is a plane parallel to the axial direction.

[0032] In some embodiments, the switching drive member includes two first drive parts, and the connecting rod assembly includes two second drive parts. The two first drive parts are respectively located on both sides of the connecting rod assembly and are respectively opposite to the positions of the two second drive parts.

[0033] In some embodiments, the third direction is the direction toward the connecting rod, the connecting rod assembly is in the second state, and when the switching drive member moves in the third direction relative to the closing pull rod assembly, the first drive part drives the second drive part toward the direction close to the connecting rod, so that the third pivot part and the fourth pivot part move in the direction away from the connecting rod.

[0034] In some embodiments, the second pivoting portion is rotatably connected to the closing pull rod assembly via a third pin shaft, the second driving portion is disposed on the second pivoting portion, and the second driving portion and the fourth pivoting portion are respectively located on either side of the third pin shaft;

[0035] When the connecting rod assembly is in the second state, the second driving portion is located on the side of the first driving portion facing the connecting rod. When the switching driving member moves along the third direction, the first driving portion drives the second driving portion along the third direction, so that the second rod rotates around the third pin shaft, and the fourth pivot portion and the third pivot portion move in a direction away from the connecting rod.

[0036] In some embodiments, the switching drive member includes two side walls, which are respectively located on both sides of the third driving portion, and the first driving portion is a fourth pin connected between the two side walls of the switching drive member.

[0037] In some embodiments, when the connecting rod assembly is in the first state, the second driving portion is located on the side of the first driving portion facing the connecting rod, and there is a height gap between the second driving portion and the surface opposite to the first driving portion; a mating groove is provided on the side of the second driving portion away from the connecting rod, and when the connecting rod assembly is in the second state, the first driving portion at least partially enters the mating groove.

[0038] In some embodiments, the switching drive member also includes a first outer sleeve, and the closing pull rod assembly includes a second outer sleeve. The first outer sleeve and the second outer sleeve are respectively arranged on the outside of the connecting rod, and the first outer sleeve is located on the proximal side of the second outer sleeve.

[0039] In some embodiments, a closing pull tab is further included, wherein a proximal end side of the closing pull tab is connected to the closing rod assembly via a connecting pin.

[0040] An embodiment of the present invention further provides a medical stapler, comprising the above-mentioned closing switching mechanism.

[0041] The closed switching mechanism and medical stapler provided by the present invention have the following advantages:

[0042] The present invention provides a closing switching mechanism for a medical stapler. By operating a switching drive member, the connecting rod assembly can be driven to switch between different states, and the closing rod assembly can be controlled to move axially along the stapler. When the switching drive part moves in a first axial direction, the closing rod assembly can be driven to move in the first direction to close the nail head. When the switching drive part moves in a third direction relative to the closing rod assembly, the closing rod assembly can be driven by the connecting rod assembly to move in the second direction to open the nail head. The structure is simple and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0044] Figure 1 is a schematic structural diagram of the stapler according to the first embodiment of the present invention;

[0045] Figure 2 This is a schematic structural diagram of a nail head according to a first embodiment of the present invention;

[0046] Figure 3 2 is a schematic structural diagram of the stapler body after removing one side of the shell according to the first embodiment of the present invention;

[0047] Figure 4 is a structural diagram of a closed switching mechanism according to a first embodiment of the present invention;

[0048] Figure 5 is a perspective view of a closing switching mechanism according to a first embodiment of the present invention;

[0049] Figure 6 is a schematic structural diagram of a connecting rod assembly in a first state according to a first embodiment of the present invention;

[0050] Figure 7 2 is a schematic structural diagram of a closed switching mechanism when the connecting rod assembly of the first embodiment of the present invention is in a first state;

[0051] Figure 8 is an exploded view of the closing switching mechanism of the first embodiment of the present invention;

[0052] Figure 9 is a schematic structural diagram of the connecting rod assembly in the second state according to the first embodiment of the present invention;

[0053] Figure 10 is a structural schematic diagram of the closing switching mechanism when the connecting rod assembly of the first embodiment of the present invention is in the second state;

[0054] Figure 11 2 is a schematic structural diagram of a nail head opening and closing switching mechanism according to a first embodiment of the present invention;

[0055] Figure 12 2 is a schematic structural diagram of a closing switching mechanism when the connecting rod assembly of the second embodiment of the present invention is in the first state;

[0056] Figure 13 is a structural schematic diagram of a closing rod assembly when the connecting rod assembly according to the second embodiment of the present invention is in the second state;

[0057] Figure 14 is a perspective view of a closing rod assembly according to a second embodiment of the present invention;

[0058] Figure 15 is an exploded view of a closing rod assembly according to a second embodiment of the present invention;

[0059] Figure 16 It is a structural schematic diagram of the nail head opening and closing switching mechanism of the second embodiment of the present invention.

[0060] Reference numerals:

[0061] 1 Stapler body 511 through hole

[0062] 11 Fixed handle 515 Bottom of the second outer sleeve

[0063] 12 Closing pull tab 52 Third drive unit

[0064] 13 Shell 521 Guide

[0065] 131 guide groove 522 matching hole

[0066] 14 Stopper 524 First cavity

[0067] 18 Connecting rod 53 Boss

[0068] 19 Connecting pin 61 Closed return spring

[0069] 3 Firing handle 62 Switching return spring

[0070] 4 Connecting rod assembly 7 Switching drive

[0071] 41 First rod 71 First outer cover

[0072] 412 first pivoting portion 72 first driving portion

[0073] 413 Third pivoting portion 73 operating portion

[0074] 42 Second rod 74 Spring mounting portion

[0075] 422 Second pivoting portion 75 connecting the mating portion

[0076] 423 fourth pivot portion 751 slide slot

[0077] 424 Make way slot 7511 first section

[0078] 425 matching groove 7512 second section

[0079] 43 First pin 9 nail head

[0080] 44 second pin 91 anvil

[0081] 45 third pin 911 first matching groove

[0082] 46 Second driving unit 92 Nail magazine assembly

[0083] 5 Close the pull rod assembly 921 second matching groove

[0084] 51 Second outer sleeve 93 Closing pin DETAILED DESCRIPTION

[0085] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example 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 concepts of the example embodiments to those skilled in the art. Identical reference numerals in the drawings represent identical or similar structures, and thus repeated description thereof will be omitted.

[0086] The present invention provides a closing switching mechanism for a medical stapler and a medical stapler including the closing switching mechanism. The stapler further comprises a stapler head and a stapler body, wherein the stapler head is disposed at the distal end of the stapler body, and a closing tab for closing the stapler head is disposed in the stapler body, wherein the distal end of the closing tab is connected to the stapler head. The closing switching mechanism comprises: a connecting rod assembly comprising a first pivotal portion and a second pivotal portion, wherein the first pivotal portion is pivotally connected to the stapler body, and wherein the connecting rod assembly comprises a first state and a second state; a closing pull rod assembly pivotally connected to the second pivotal portion; a switching drive member capable of moving relative to the stapler body in a first direction and a second direction, wherein the first direction and the second direction are opposite and are the axial direction of the stapler, the switching drive member being fixed relative to the closing pull rod assembly in the axial direction, and the switching drive member being capable of moving relative to the closing pull rod assembly in a third direction, wherein a fixed angle is set between the third direction and the first direction or the second direction.

[0087] When it is necessary to close the stapler's nail head, the switching drive is operated to move it toward the first direction, driving the closing rod assembly to move in the first direction, so that the connecting rod assembly enters the second state from the first state, and the closing rod assembly can drive the closing pull tab to close the stapler's nail head. When the switching drive moves along the third direction relative to the closing rod assembly, it drives the connecting rod assembly into the first state, and the second pivotal portion drives the closing rod assembly and the switching drive to move in the second direction, and the closing rod assembly can drive the closing pull tab to open the stapler's nail head. Thus, by operating the switching drive, the connecting rod assembly can be driven to switch between different states, and the closing rod assembly can be controlled to move along the axial direction of the stapler, thereby controlling the closing and opening of the stapler's nail head. The structure is simple and easy to use.

[0088] The structures of the closing switching mechanisms of various specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the various specific embodiments are not intended to limit the scope of protection of the present invention.

[0089] like Figures 1 to 11 As shown, the first embodiment of the present invention provides a closing switching mechanism for a medical stapler and a medical stapler including the closing switching mechanism. Figure 1 As shown, the stapler further includes a stapler head 9, a stapler body 1, and a firing handle 3. The firing handle 3 is movably connected to the stapler body 1. The stapler head 9 is disposed at the distal end of the stapler body 1. The stapler body 1 includes a housing 13, one side of which is provided with a fixed handle 11. A closing tab 12 for closing the stapler head 9 is provided inside the stapler body 1. The distal end of the closing tab 12 is connected to the stapler head 9.

[0090] In the present invention, the distal side and the proximal side are relative to the operator, the end closer to the operator is the proximal side, the end farther from the operator, that is, the end closer to the surgical site is the distal side, and the direction along the axis of the stapler is the axial direction, that is, the direction from the distal side to the proximal side of the stapler, or from the proximal side to the distal side of the stapler. For example, in Figure 1 From the perspective of FIG, for the stapler, the distal side is the left side and the proximal side is the right side. Figure 1 The S1 direction is the direction from the distal end to the proximal end of the stapler. The S1 direction and / or the direction opposite to the S1 direction is defined as the axial direction of the stapler. Figure 3 The S2 direction is the longitudinal direction, that is, the height direction.

[0091] like Figure 2 As shown, the nail head portion 9 includes an anvil 91 and a cartridge assembly 92 disposed opposite each other. The proximal end of the anvil 91 is rotatably connected to the proximal end of the cartridge assembly 92, allowing the anvil 91 to have an open and closed state relative to the cartridge assembly 92. Specifically, the proximal end of the anvil 91 is provided with a first mating slot 911, and the proximal end of the cartridge assembly 92 is provided with an axially extending second mating slot 921. A closing pin 93 is disposed through both the first mating slot 911, the second mating slot 921, and the distal end of the closing tab 12. When the closing tab 12 moves proximally, the closing pin 93 also moves proximally, driving the anvil 91 toward the cartridge assembly 92 and closing the nail head portion 9. When the closing tab 12 moves distally, the closing pin 93 also moves distally, driving the anvil 91 away from the cartridge assembly 92 and opening the nail head portion 9.

[0092] like Figures 3 to 7 As shown, the closing switching mechanism includes a connecting rod assembly 4, a switching drive member 7, and a closing pull rod assembly 5. The connecting rod assembly 4 includes a first rod 41 and a second rod 42. The second rod 42 is located on the proximal side of the first rod 41. The first rod 41 includes a first pivot portion 412 and a third pivot portion 413. The second rod 42 includes a second pivot portion 422 and a fourth pivot portion 423. The first pivot portion 412 is pivotally connected to the housing 13 of the stapler body 1 via a 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 pivotal portion 413 is pivotally connected to the fourth pivotal portion 423 via a second pin, and the second pivotal portion 422 is pivotally connected to the closing rod assembly 5 via a third pin 45, such that the second pivotal portion 422 and the closing rod assembly 5 are axially fixed relative to each other. The closing rod assembly 5 is fixedly connected to the proximal end of the closing tab 12, so that axial movement of the closing rod assembly 5 can drive axial movement of the closing tab 12. The switching drive member 7 is fixed axially relative to the closing rod assembly 5 and is movable relative to the closing rod assembly 5 in a third direction, with the third direction forming a fixed angle with either the first direction or the second direction. Axially fixed in the anastomosis apparatus means that the switching drive member 7 does not axially displace relative to the closing rod assembly 5. The switching drive member 7 is movable in a first direction and a second direction, with the first direction and the second direction being opposite directions. When the switching drive member 7 moves in the axial direction, the closing pull rod assembly 5 also moves in the axial direction together with the switching drive member 7 .

[0093] In this embodiment, the connecting rod assembly 4 includes a first state and a second state, both of which are relatively balanced. The switching drive member 7 includes a first position area and a second position area. Figure 6 and Figure 7 As shown, in the initial state, the connecting rod assembly 4 is in the first state, and the connecting rod 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 member 7 is in the first position area. When it is necessary to drive the nail head 9 to close, the switching drive member 7 is driven to move toward the first direction, the closing pull rod assembly 5 is driven to move toward the first direction, and the second pivot portion 422 is driven to move toward the first direction, the third pivot portion 413 and the fourth pivot portion 423 rotate relative to each other, and the connecting rod assembly 4 enters the second state. Figure 9 and Figure 10As shown, the connecting rod assembly 4 now enters a relatively extended state, the axial distance between the first pivoting portion 412 and the second pivoting portion 422 increases, while the first pivoting portion 412 does not move axially relative to the stapler body 1. Simultaneously, the closing rod assembly 5 drives the closing tab 12 in the first direction to close the stapler head 9. When the switching drive member 7 moves to the second position, the stapler head 9 is completely closed.

[0094] After the staple head 9 is closed, the connecting rod assembly 4 is in the relatively stable second state, and the switching drive member 7 is in the second position region. At this time, under the action of the connecting rod assembly 4, the closed stability of the staple head 9 can be maintained, and the stapler can be fired. During the firing of the stapler, there will be no accidental movement of the closing tab 12, which would affect the closed stability of the staple head 9. After the stapler is fired, when it is necessary to open the staple head 9, the switching drive member 7 is operated to move relative to the closing rod assembly 5 in the third direction, driving the connecting rod assembly 4 from the second state to the first state. The second pivoting portion 422 of the connecting rod assembly 4 drives the closing rod assembly 5 in the second direction. The closing rod assembly 5 can drive the switching drive member 7 in the second direction to return to the first position region. At the same time, the closing rod assembly 5 drives the closing tab 12 to move distally to open the staple head 9, thereby achieving manual opening of the staple head 9. The structure is simple and the operation is convenient.

[0095] The following combination Figures 3 to 11 The structure and working principle of the closing switching mechanism of this embodiment are specifically described. In this embodiment, the second position area is located on the proximal side of the first position area. The first direction and the second direction are both along the axial direction of the stapler. Specifically, the first direction is toward the proximal side of the stapler ( Figure 3 The second direction is the direction toward the distal end of the stapler (the opposite direction to S1). When the switching drive member 7 moves from the first position area to the proximal side, it can drive the stapler head to close. When the switching drive member 7 moves from the second position area to the distal side, it can drive the stapler head to open. The first position area refers to the Figure 7 The position area of ​​the switching drive member 7 in the initial state shown in FIG. Figure 10 The switching drive member 7 is located in the position area after the nail head is closed.

[0096] like Figures 3 to 7 As shown, the closing switching mechanism further includes a connecting rod 18. The closing pull tab 12 is arranged inside the connecting rod 18. In this embodiment, the third direction is Figure 3The direction from top to bottom in the perspective of the third pivoting portion 413 and the fourth pivoting portion 423 is the direction away from the connecting rod 18. The angle between the third direction and the first direction is a right angle, and the switching drive member 7 moves in the up and down direction relative to the closing pull rod assembly 5. A fourth direction is defined here, and the fourth direction is the direction in which the third direction moves. Figure 3 The direction from bottom to top in the perspective of FIG, that is, for the third pivot portion 413 and the fourth pivot portion 423, is toward the direction close to the connecting rod 18. The third direction and the fourth direction are both perpendicular to the axial direction of the stapler, which is defined as the longitudinal direction here, and the two directions are opposite. Figure 7 The figure is a schematic diagram of the structure of the closed switching mechanism in the initial state of this embodiment. Figure 7 In this state, the third pivoting portion 413 and the fourth pivoting portion 423 are located relatively far away from the connecting rod 18, the connecting rod assembly 4 is in a relatively stable first state, and the axial distance between the first pivoting portion 412 and the second pivoting portion 422 is small. The switching drive member 7 is in the first position range.

[0097] like Figure 7 and Figure 8 As shown, the switching drive member 7 includes an operating portion 73, a first driving portion 72, a first connecting portion and a connecting fitting portion 75. The operating portion 73 is connected to the first connecting portion. In this embodiment, the first connecting portion is a first outer sleeve 71. The shell 13 is correspondingly provided with a receiving groove for accommodating the operating portion 73. The operating portion 13 partially enters the interior of the receiving groove and can move relative to the receiving groove, and protrudes from the outer surface of the shell 13 of the anastomosis device body 1 to facilitate the operator's use. The first outer sleeve 71 is sleeved on the outside of the closing pull rod assembly 5 and can move axially relative to the connecting rod 18. The first driving portion 72 and the connecting fitting portion 75 are located on the side of the first outer sleeve 71 facing the connecting rod assembly 4, and the connecting fitting portion 75 is located on the proximal side of the first driving portion 72. A second driving portion 46 is provided at the third pivot portion 413 of the first rod 41. In the initial state, the second driving portion 46 is located relatively far from the connecting rod 18 along with the third pivot portion 413 and does not come into contact with the first driving portion 72. Consequently, the first driving portion 72 does not apply any force to the second driving portion 46. In this embodiment, the second driving portion 46 is integrally formed with the second pin, i.e., the second driving portion 46 partially extends through the third pivot portion 413 and the fourth pivot portion 423, pivotally connecting the third pivot portion 413 and the fourth pivot portion 423. 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 the first driving portion 72.

[0098] like Figure 3 、 Figure 5 and Figure 8 As shown, the closing lever assembly 5 includes a second outer sleeve 51 and a third driving portion 52. The second outer sleeve 51 is sleeved onto the exterior of the connecting rod 18 and includes a distal portion and a proximal portion. The outer diameter of the distal portion is smaller than that of the proximal portion. A switching mating surface 513 is provided between the distal and proximal portions of the second outer sleeve 51. The distal portion of the second outer sleeve 51 is at least partially inserted into the interior of the first outer sleeve 71 of the switching mating member 7. The switching mating surface 513 of the second outer sleeve 51 mates with the proximal surface of the first outer sleeve 71. Preferably, the proximal surface of the first outer sleeve 71 and the switching mating surface 513 of the second outer sleeve 51 abut against each other. The distal end of the second outer sleeve 51 is provided with a through hole 511. A connecting pin 19 passing through the through hole 511 of the second outer sleeve 51 can securely connect the distal end of the second outer sleeve 51 to the proximal end of the closing tab 12. The first end of the third driving portion 52 is pivotally connected to the second pivoting portion 422 of the second rod 42, and the second end of the third driving portion 52 is connected to the second outer sleeve 51. One or two guide portions 521 are provided on the side of the third driving portion 52. One or two guide grooves 131 are provided on the inner surface of the shell 13 of the anastomosis body 1. The guide groove 131 extends in the axial direction. The guide portion 521 at least partially enters the guide groove 131 and can move along the extension direction of the guide groove 131. The cooperation between the guide portion 521 and the guide groove 131 limits the movement of the closing rod assembly 5 only in the axial direction. In other alternative embodiments, a guide portion can also be provided on the inner surface of the shell 13 of the anastomosis body 1, and a guide groove can be provided on the side of the third driving portion 52, which also falls within the scope of protection of the present invention.

[0099] like Figure 7 and Figure 8 As shown, the switching drive member 7 and the switching drive member 5 are connected by the cooperation of the boss and the slide. Specifically, the connecting fitting portion 75 is provided with a slide 751, and the slide 751 extends along the third direction. The third driving portion 52 is provided with a boss 53, and the boss 53 at least partially enters the interior of the slide 751 and can move along the extension direction of the slide 751, that is, the boss 53 can move along the longitudinal direction of the anastomosis device relative to the slide 751. The slide 751 includes a first section 7511 and a second section 7512, and the first section 7511 is located below the second section 7512. As shown in FIG. Figure 7In the initial state shown, the boss 53 is located in the first section 7511 of the chute 751. When the switching driver 7 is moved downward by the operating portion 73, the boss 53 enters the second section 7512 of the chute 751. In another alternative embodiment, the boss 53 may be provided on the second outer sleeve 51. In yet another embodiment, the boss may be provided on the connecting portion 75, and the third driving portion 52 or the second outer sleeve 51 may be provided with a chute extending along the third direction, with the boss at least partially entering the chute.

[0100] like Figure 3 and Figure 7 As shown, a stopper 14 is provided inside the housing 13 of the stapler body 1, and the stopper 14 is located on the proximal side of the second outer sleeve 51. A closing biasing member is provided between the closing rod assembly 5 and the stopper 14, and the closing biasing member applies a first biasing force toward the distal side to the closing rod assembly 5. In this embodiment, the closing biasing member is a closing return spring 61, and can optionally be a compression spring provided between the second outer sleeve 51 of the closing rod assembly 5 and the stopper 14. In other alternative embodiments, the closing biasing member can also be a spring, a tension spring provided on the distal side of the closing rod assembly 5, or other types of elastic members.

[0101] exist Figure 7 In the illustrated state, when the connecting rod assembly 4 is in the first state, the closing return spring 61 undergoes substantially no deformation or only minor deformation. Under the first biasing force of the closing return spring 61, the closing lever assembly 5 is maintained in its initial position, and the switching driver 7 is held in the first position range. The closing return spring 61 further maintains the stability of the closed switching mechanism when no external forces are acting on it.

[0102] exist Figure 7In the illustrated state, the operating portion 73 of the switching driver 7 is operated, causing the switching driver 7 to move from the first position region toward the proximal side. The slot 751 of the connecting and fitting portion 75 of the switching driver 7 cooperates with the boss 53 to drive the third driver 52 toward the proximal side. Furthermore, because the switching fitting surface 513 of the second outer sleeve 51 cooperates with the proximal surface of the first outer sleeve 71, the first outer sleeve 71 can also act on the switching fitting surface 513, thereby enabling the switching driver 7 to apply a more uniform force toward the proximal side to the closing rod assembly 5, driving the closing rod assembly 5 to move in the first direction, i.e., toward the proximal side of the stapler. The closing rod assembly 5 drives the second pivoting portion 422 to move in the first direction via the third driver 52. The third pivoting portion 413 and the fourth pivoting portion 423 move toward the fourth direction, i.e., upward and approach the connecting rod 18. The first rod 41 rotates counterclockwise around the first pivot 43, and the second rod 42 rotates clockwise around the third pivot 45. The connecting rod assembly 4 enters the second state, and the axial distance between the first pivoting portion 412 and the second pivoting portion 422 increases. At this time, the state of the connecting rod assembly 4 is as follows: Figure 9 As shown, the state of the closed switching mechanism is as follows Figure 10 Compare Figure 10 and Figure 7 It can be seen that the switching drive member 7 moves toward the proximal side to the second position area, and the closing pull rod assembly 5 compresses the closing return spring 61 to produce elastic deformation. At the same time, due to the movement of the third driving part 52 toward the proximal side, the second outer sleeve 51 drives the closing pull tab 12 to move toward the proximal side, closing the nail head 9. Figure 10 In the state, the first driving part 72 is located on the side of the second driving part 46 facing the connecting rod 18, and there is preferably a certain height gap between the surfaces opposite to each other in the longitudinal direction (i.e., the S2 direction) of the first driving part 72 and the second driving part 46, so that the first driving part 72 will not act on the second driving part 46. Here, the gap between the surfaces opposite to each other of the first driving part 72 and the second driving part 46 refers to the gap between the lower surface of the first driving part 72 and the upper surface of the second driving part 46. At this time, the connecting rod assembly 4 is in a relatively stable second state, and under the action of the connecting rod assembly 4, the closing pull rod assembly 5 and the switching drive member 7 are also in a relatively stable state, thereby maintaining the stability of the nail head 9 after closing. At this time, by holding the firing handle 3, the stapler can be fired by driving the rack (not shown) in the stapler body.

[0103] like Figure 8As shown, the third pivot portion 413 of the first rod 41 is provided with the second drive portion 46, and the switching drive member 7 includes two first drive portions 72, which are symmetrically arranged relative to the axis of the anastomosis device. The two ends of the second drive portion 46 protrude from the left and right outer surfaces of the pivot portion 413 and are arranged opposite to the two first drive portions 72. The side of the first drive portion 72 facing the second drive portion 46 is preferably parallel to the axial plane. The guide portion 521 is a convex strip provided on the side of the third drive portion 52, and one guide portion 521 can be provided on both the left and right sides of the third drive portion 52. The distal side of the third drive portion 52 is provided with a first mating 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. Furthermore, a clearance groove 424 is provided on a side of the second rod 42 facing the connecting rod 18 . When the connecting rod assembly 4 is in the second state, the bottom 515 of the second outer sleeve 51 partially enters the clearance groove 424 .

[0104] In other alternative embodiments, the number of the first drive parts 72 is not limited to two, for example, only one first drive part 72 is provided. The installation position and method of the closing reset spring 61 and the switching reset spring 62 may also be different from this embodiment. In other alternative embodiments, the second drive part 46 may also be provided on the fourth pivot part 423, or on other positions of the first rod 41 or the second rod 42, as long as the second drive part 46 can drive the third pivot part 413 and the fourth pivot part 423 to move downward when it moves downward. Alternatively, the second drive part 46 may not be provided integrally with the second pin shaft, but a second pin shaft and one or more second drive parts 46 may be provided separately. In other alternative embodiments, the guide part 521 may also be provided as a boss or other structure.

[0105] like Figure 8 and Figure 10As shown, a switching biasing member is provided between the switching drive member 7 and the closing lever assembly 5. When the switching drive member 7 moves in the third direction, the switching biasing member undergoes elastic deformation, applying a second biasing force to the switching drive member 7 along the fourth direction. Specifically, a spring mounting portion 74 is provided on the surface of the connecting and fitting portion 75 of the switching drive member 7, and the closing lever assembly 5 is provided with a boss. The switching biasing member is a switching return spring 62, which can optionally be a tension spring. The two ends of the switching return spring 62 are respectively mounted on the spring mounting portion 74 and the boss. In this embodiment, the boss provided on the closing lever assembly 5 is the boss 53 that cooperates with the slide slot 751. The spring mounting portion 74 is a column provided on the connecting and fitting portion 75, and the spring mounting portion 74 is located below the boss 53. The two ends of the switching return spring 62 are respectively hung on the boss 53 and the spring fitting portion 74. In this embodiment, two switching biasing members are provided, symmetrically arranged relative to the stapler's axial direction to more evenly apply force to the switching driver 7. However, the present invention is not limited to this. In other alternative embodiments, for example, only one switching biasing member may be provided, or more switching biasing members may be provided. In other alternative embodiments, the spring mounting portion and the boss 53 provided on the closing rod assembly 53 may also be two separate, independent components. In another alternative embodiment, the switching biasing member is a tension spring or a compression spring, with both ends fixed to other locations on the switching driver 7 and the closing rod assembly 5.

[0106] exist Figure 10 In the state shown, the stapler can be fired by gripping the firing handle 3. During the firing process, due to the stable state of the connecting rod assembly 4, the states of the connecting rod assembly 4, the closing rod assembly 5, and the switching drive 7 do not change, that is, the connecting rod assembly 4 remains in the second state, the switching drive 7 remains in the second position area, and the closing pull tab 12 does not experience unexpected axial movement, thereby maintaining the stable closure of the staple head 9.

[0107] like Figure 11 As shown, after the stapler is fired, when the stapler head 9 needs to be opened, the operator operates the operating portion 73 protruding from the outside of the housing 13 to drive it to move in the third direction, that is, Figure 10 From the perspective of , the switching driver 7 is driven to move downward (in the direction opposite to the S2 direction), and 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, so that the connecting rod assembly 4 enters the first state. In the process of the connecting rod assembly 4 returning to the first state from the second state, Figure 11From the perspective of , the first rod 41 rotates clockwise around the first pivot 43, the second rod 42 rotates counterclockwise around the second pivot 44, and the second pivoting portion 422 moves in the second direction, that is, moves toward the distal side of the anastomosis device, and the second pivoting portion 422 drives the third driving portion 52 to move toward the distal side. Since the closing rod assembly 5 and the switching drive 7 are relatively fixed in the axial direction through the boss 53 and the slide groove 751, and the switching mating surface 513 of the closing rod assembly 5 is in abutment with the proximal surface of the switching drive 7, the closing rod assembly 5 then drives the switching drive 7 to move toward the distal side to the first position area. At the same time, the second outer sleeve 51 drives the closing pull tab 71 to move toward the distal side, which can open the nail head. The closing reset spring 61 also returns to its initial state, and the first biasing force of the closing reset spring 61 further ensures that the closing rod assembly 5 can return to its initial position. At this time, the state of the closing switching mechanism is as follows. Figure 11 shown.

[0108] Therefore, after the stapler is fired, the operating part 73 of the switching drive member 7 is operated to move in the third direction, that is, the connecting rod assembly 4 can be driven from the second state to the first state, and the closing pull rod assembly 5 can be driven to move toward the distal side to open the nail head 9, thereby realizing manual opening of the nail head 9, which has a simple structure and is easy to operate.

[0109] exist Figure 11 In the state, the slide groove 751 as a whole moves downward relative to the boss 53, and the boss 53 enters the second section 7512 of the slide groove 751. The distance between the boss 53 and the spring mounting portion 74 increases, and the switching reset spring 62 is stretched and elastically deformed. At this time, the operator releases the operating portion 73, and the operating portion 73 loses the external force. Under the action of the second biasing force of the switching reset spring 62, the switching drive member 7 moves along the fourth direction (i.e., upward) and returns to the initial position (i.e., Figure 7 ), the boss 53 re-enters the first section 7511 of the sliding groove 751.

[0110] like Figures 12-16 The figure is a schematic diagram of the structure of the closing switching mechanism of the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that in the second embodiment, the movement direction of the switching drive member 7 when driving the nail head 9 to open is different from that of the first embodiment. In the second embodiment, the definitions of the third direction and the fourth direction are opposite to those of the first embodiment. Figure 12From the perspective of FIG, direction S2 is the third direction, i.e., the upward direction, and the direction opposite to direction S2 is the fourth direction, i.e., the downward direction. When the connecting rod assembly 4 is in the second state and the switching driver 7 moves along the third direction, the switching driver 7 lifts the second driving portion 72 upward, causing the third pivoting portion 413 and the fourth pivoting portion 423 to move downward (in the fourth direction) and away from the connecting rod 18, thereby entering the first state.

[0111] The following combination Figures 12-16 The structure and working principle of the closing switching mechanism of the second embodiment are described in detail. Figure 12 The figure shows a schematic diagram of the structure of the closing switching mechanism when the connecting rod assembly 4 of this embodiment is in the first state. In this embodiment, the switching drive 7 is located in the first position area. The switching drive 7 is located on the proximal side of the second outer sleeve 51, and the relative position of the switching drive 7 and the closing pull rod assembly 5 in the axial direction does not change. The first outer sleeve 71 of the switching drive 7 is sleeved on the outside of the connecting rod 18, and the connecting fitting portion 75 of the switching drive 7 and the third drive 5 are axially relatively fixed by the connection between the slide groove 751 and the boss 53. The boss 53 is located in the second section 7512 of the slide groove 751 (marked at Figure 15 ), the spring mounting portion 74 is located above the boss 53. Figure 12 In the state, the operating part 73 drives the switching driving member 7 to move toward the proximal side to the second position area, driving the closing pull rod assembly 5 to move toward the proximal side, and the third driving part 52 drives the second pivot part 422 to move toward the proximal side, driving the connecting rod assembly 4 to enter the first state, and the second outer sleeve 51 compresses the closing return spring 61 to produce elastic deformation, while driving the closing pull tab 12 to move toward the proximal side to close the nail head. At this time, the closing switching mechanism is in the state as shown in FIG. Figure 13 Status shown.

[0112] like Figure 14 and Figure 15 As shown, in the second embodiment, the second driving portion 46 is provided on the second pivoting portion 422, and the second driving portion 46 and the fourth pivoting portion 423 are respectively located on both sides of the third pin 45. Therefore, in this embodiment, the second driving portion 46 is no longer integrally provided with the second pin 44. Figure 14As shown, the second driving portion 46 is located proximal to the third pin 45, and the fourth pivoting portion 423 is located distal to the third pin 45. The second rod 42 forms a lever structure that can rotate relative to the third pin 45. Therefore, when the connecting rod assembly 4 moves from the first state to the second state, the fourth pivoting portion 423 moves toward the connecting rod 18, and the second pivoting portion 422 rotates clockwise relative to the third pin 45, causing the second driving portion 46 to move away from the connecting rod 18. Furthermore, when the second driving portion 46 moves toward the connecting rod 18, the second pivoting portion 422 rotates counterclockwise relative to the third pin 45, causing the fourth pivoting portion 423 to move away from the connecting rod 18.

[0113] like Figure 14 and Figure 15 As shown, in the second embodiment, the switching drive member 7 includes two side walls, which are respectively located on both sides of the third drive portion 52. The first drive portion 72 is a fourth pin connected between the two side walls of the switching drive member 7. A mating groove 425 is provided on the side of the second drive portion 46 away from the connecting rod. When the connecting rod assembly 4 is in the first state, the second drive portion 46 is located on the side of the first drive portion 72 facing the connecting rod 18, and there is a certain height gap between the lower surface of the second drive portion 46 and the upper surface of the first drive portion 72, so that the first drive portion 72 does not act on the second drive portion 46. When the connecting rod assembly 4 is in the second state, the first drive portion 72 at least partially enters the mating groove 425 to form a relatively stable mating with the second drive portion 46.

[0114] exist Figure 13In the state, when it is necessary to open the stapler's nail head 9, the operator lifts the operating part 73 upwards to drive the operating part 73 in the third direction, i.e., upward movement. The first driving part 72 lifts the second driving part 46 upwards, so that the second driving part 46 moves in the direction close to the connecting rod 18. The second pivoting part 422 rotates counterclockwise around the third pin 45, so that the fourth pivoting part 423 and the third pivoting part 413 move in the direction 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. The closing pull rod assembly 5 then drives the switching drive member 7 to move in the distal direction to the first position area. At the same time, the second outer sleeve 51 drives the closing pull tab 71 to move in the distal direction to open the nail head. The closing reset spring 61 also returns to its initial state, and the first biasing force of the closing reset spring 61 further ensures that the closing pull rod assembly 5 can return to its initial position. At this time, the state of the closing switching mechanism is as follows: Figure 16 shown.

[0115] Therefore, after the stapler is fired, the operating part 73 of the switching drive member 7 is operated to move in the third direction, that is, the connecting rod assembly 4 can be driven from the second state to the first state, and the closing pull rod assembly 5 can be driven to move toward the distal side to open the nail head 9, thereby realizing manual opening of the nail head 9, which has a simple structure and is easy to operate.

[0116] exist Figure 16 In the state, the chute 751 as a whole moves upward relative to the boss 53, and the boss 53 enters the first section 7511 of the chute 751 (shown in FIG. Figure 15 ). The distance between the boss 53 and the spring mounting portion 74 increases, and the switch reset spring 62 is stretched and elastically deformed. At this time, the operator releases the operating portion 73, and the operating portion 73 loses the external force. Under the second biasing force of the switch reset spring 62, the switch drive member 7 moves along the fourth direction (i.e., downward) and returns to the initial position (i.e., Figure 12 ), the boss 53 re-enters the second section 7512 of the sliding groove 751.

[0117] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A closed switching mechanism, characterized in that: For a medical stapler, the closing switching mechanism includes: A connecting rod assembly includes a first pivot portion and a second pivot portion, wherein the first pivot portion is pivotally connected to the stapler body, and the connecting rod assembly includes a first state and a second state; a closing pull rod assembly pivotally connected to the second pivot portion; a switching drive member, movable relative to the stapler body in a first direction and a second direction, the first direction and the second direction being opposite and being the axial direction of the stapler, the switching drive member being fixed relative to the closing rod assembly in the axial direction, and the switching drive member being movable relative to the closing rod assembly in a third direction, the third direction being provided with a fixed angle with respect to the first direction or the second direction; When the switching drive moves toward the first direction, it drives the closing rod assembly to move toward the first direction, so that the connecting rod assembly enters the second state from the first state; when the switching drive moves along the third direction relative to the closing rod assembly, it drives the connecting rod assembly to enter the first state, and the second pivot portion drives the closing rod assembly and the switching drive to move in the second direction.

2. The closed switching mechanism according to claim 1, characterized in that: The included angle is a right angle, and the switching drive member moves in an up and down direction relative to the closing pull rod assembly.

3. The closed switching mechanism according to claim 2, characterized in that: The first direction is a proximal direction toward the stapler, and the second direction is a distal direction toward the stapler.

4. The closing switching mechanism according to claim 2, characterized in that: The switching drive member includes a first driving portion and a connecting fitting portion, wherein the connecting fitting portion is fixed relative to the closing pull rod assembly in the axial direction and can move relative to the closing pull rod assembly in the third direction, and the connecting rod assembly includes a second driving portion; The connecting rod assembly is in the second state, and when the switching drive member moves in the third direction relative to the closing pull rod assembly, the first drive portion drives the second drive portion along the third direction, so that the connecting rod assembly enters the first state.

5. The closing switching mechanism according to claim 4, characterized in that: Also comprising a connecting rod, the third direction is a direction toward the connecting rod or a direction away from the connecting rod; The connecting rod assembly includes a first rod and a second rod, the second rod is located at the proximal end side of the first rod, the first rod includes the first pivot portion and the third pivot portion, the second rod includes the second pivot portion and the fourth pivot portion, and the third pivot portion is pivotally connected to the fourth pivot portion; When the connecting rod assembly enters the second state from the first state, the third pivotal portion and the fourth pivotal portion move toward the connecting rod; when the connecting rod assembly is in the second state and the switching drive member moves in the third direction relative to the closing pull rod assembly, the switching drive member drives the third pivotal portion and the fourth pivotal portion to move in a direction away from the connecting rod.

6. The closing switching mechanism according to claim 5, characterized in that: The switching drive member also includes a first connecting part, the closing pull rod assembly includes a second outer sleeve and a third driving part, the first connecting part is movably connected to the second outer sleeve, the second outer sleeve is sleeved on the outside of the connecting rod, and the third driving part is pivotally connected to the second pivot part of the connecting rod assembly.

7. The closing switching mechanism according to claim 6, characterized in that: The first connecting portion is a first outer sleeve portion, and the first connecting portion is sleeved on the second outer sleeve portion.

8. The closed switching mechanism according to claim 6, characterized in that: A closing biasing member is provided between the second outer sleeve of the closing rod assembly and the stapler body, and the closing biasing member applies a first biasing force to the closing rod assembly toward the second direction.

9. The closing switching mechanism according to claim 6, characterized in that: The third driving portion includes a first cavity, and the second rod at least partially enters the first cavity.

10. The closing switching mechanism according to claim 4, characterized in that: The connecting and fitting portion is provided with a sliding groove extending along the third direction, and the closing pull rod assembly is provided with a protruding column, or the closing pull rod assembly is provided with a sliding groove extending along the third direction, and the connecting and fitting portion is provided with a protruding column; The protrusion at least partially enters the interior of the sliding groove and can move along the extension direction of the sliding groove.

11. The closing switching mechanism according to claim 6, characterized in that: The switching drive member further includes an operating portion, which is provided on the first connecting portion and protrudes from the outer surface of the shell of the stapler body. The shell is provided with an accommodating groove for accommodating the operating portion.

12. The closing switching mechanism according to claim 1, characterized in that: A switching biasing member is provided between the switching driving member and the closing pull rod assembly, and the switching biasing member applies a second biasing force along a fourth direction to the switching driving member, and the fourth direction is opposite to the third direction.

13. The closing switching mechanism according to claim 12, characterized in that: The switching drive member is provided with a sliding groove extending along the third direction, the closing pull rod assembly is provided with a protruding column, and the switching drive member is provided with a spring engaging portion, or the closing pull rod assembly is provided with a sliding groove extending along the third direction, and the switching drive member is provided with a protruding column; The protruding column at least partially enters the interior of the sliding slot and can move along the extending direction of the sliding slot. The two ends of the switching biasing member are respectively arranged on the protruding column and the spring matching portion.

14. The closing switching mechanism according to claim 5, characterized in that: The third direction is the direction away from the connecting rod, the connecting rod assembly is in the second state, and when the switching drive member moves in the third direction relative to the closing pull rod assembly, the first drive part drives the second drive part in the direction away from the connecting rod, so that the third pivot part and the fourth pivot part move in the direction away from the connecting rod.

15. The closing switching mechanism according to claim 14, characterized in that: The second driving portion is disposed on the third pivoting portion and / or the fourth pivoting portion.

16. The closing switching mechanism according to claim 15, characterized in that: The third pivoting portion and the fourth pivoting portion are pivotally connected via a second pin shaft, the second driving portion is integrally provided with the second pin shaft, and the second driving portion protrudes from surfaces of the third pivoting portion and the fourth pivoting portion.

17. The closing switching mechanism according to claim 14, characterized in that: The switching drive member also includes a first outer sleeve, and the closing pull rod assembly includes a second outer sleeve, the second outer sleeve is sleeved on the outside of the connecting rod, and the first outer sleeve is sleeved on the outside of the second outer sleeve; the first driving part is located on the distal side of the connecting mating part.

18. The closing switching mechanism according to claim 14, characterized in that: 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 first driving portion facing the second driving portion is a plane parallel to the axial direction.

19. The closing switching mechanism according to claim 14, characterized in that: The switching drive member includes two first drive parts, and the connecting rod assembly includes two second drive parts. The two first drive parts are respectively located on both sides of the connecting rod assembly and are respectively opposite to the positions of the two second drive parts.

20. The closing switching mechanism according to claim 6, characterized in that: The third direction is the direction toward the connecting rod, the connecting rod assembly is in the second state, and when the switching drive member moves in the third direction relative to the closing pull rod assembly, the first drive part drives the second drive part toward the direction approaching the connecting rod, so that the third pivot part and the fourth pivot part move toward the direction away from the connecting rod.

21. The closing switching mechanism according to claim 20, characterized in that: The second pivoting portion is rotatably connected to the closing pull rod assembly via a third pin shaft, the second driving portion is disposed on the second pivoting portion, and the second driving portion and the fourth pivoting portion are respectively located on both sides of the third pin shaft; When the connecting rod assembly is in the second state, the second driving portion is located on the side of the first driving portion facing the connecting rod. When the switching driving member moves along the third direction, the first driving portion drives the second driving portion along the third direction, so that the second rod rotates around the third pin shaft, and the fourth pivot portion and the third pivot portion move in a direction away from the connecting rod.

22. The closing switching mechanism according to claim 21, characterized in that: The switching drive member includes two side walls, which are respectively located on both sides of the third drive portion. The first drive portion is a fourth pin connected between the two side walls of the switching drive member.

23. The closing switching mechanism according to claim 21, characterized in that: When the connecting rod assembly is in the first state, the second driving portion is located on a side of the first driving portion facing the connecting rod, and a height gap is formed between the second driving portion and the surface opposite to the first driving portion; A matching groove is provided on a side of the second driving portion away from the connecting rod. When the connecting rod assembly is in the second state, the first driving portion at least partially enters the matching groove.

24. The closing switching mechanism according to claim 21, characterized in that: The switching drive member also includes a first outer sleeve, and the closing pull rod assembly includes a second outer sleeve. The first outer sleeve and the second outer sleeve are respectively sleeved on the outside of the connecting rod, and the first outer sleeve is located on the proximal side of the second outer sleeve.

25. The closing switching mechanism according to claim 1, characterized in that: It also includes a closing pull tab, the proximal end side of which is connected to the closing pull rod assembly via a connecting pin.

26. A medical stapler, characterized in that: The invention comprises the closing switching mechanism according to any one of claims 1 to 25.

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