Closure switching mechanism and medical stapler

Abstract

This invention provides a closure switching mechanism and a medical stapler. The closure switching mechanism includes: a linkage assembly comprising a first pivot portion and a second pivot portion, the first pivot portion being pivotally connected to the stapler body, the linkage assembly having a first state and a second state; a switching drive member movable along a first direction and a second direction, the first direction being opposite to the second direction; and a closure pull rod assembly pivotally connected to the second pivot portion. When the switching drive member moves toward the first direction, it drives the closure pull rod assembly to move in the first direction, causing the linkage assembly to transition from the first state to the second state. When the switching drive member moves toward the second direction, it drives the linkage assembly to enter the first state, and the second pivot portion drives the closure pull rod assembly to move in the second direction. This invention enables manual closure and manual opening of the staple head.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a closure switching mechanism and a medical stapler. Background Technology

[0002] A medical stapler includes a stapler body, a firing handle movably connected to the stapler body, and a staple head that engages with the stapler body. The staple head includes a staple cartridge assembly and an anvil positioned opposite each other. During surgery, the operator first holds the firing handle and pulls the closing tab towards the proximal end of the stapler via a closing switching mechanism, thereby closing the staple cartridge assembly and the anvil, i.e., closing the staple head. Then, the operator holds the firing handle again, which pushes the staples towards the tissue. The staples in the staple cartridge assembly are shaped at the anvil, anastomosing the tissue, while the cutter moves distally to cut the tissue, thus firing the stapler. Existing closing switching mechanisms are relatively complex, and after firing, the staple head may be difficult to open, causing inconvenience to the operator.

[0003] In this 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 position, is the distal side. Summary of the Invention

[0004] To address the problems in the prior art, the present invention aims to provide a closure switching mechanism and a medical stapler, which can achieve manual closure and manual opening of the staple head by operating the switching drive to move in different directions.

[0005] This invention provides a closure switching mechanism for a medical stapler, the stapler including a stapler body, and the closure switching mechanism including:

[0006] The linkage assembly includes a first pivot portion and a second pivot portion, wherein the first pivot portion is pivotally connected to the anastomosis device body, and the linkage assembly includes a first state and a second state.

[0007] A switching drive unit is available, which can move along a first direction and a second direction, wherein the first direction is opposite to the second direction.

[0008] A closing lever assembly, the closing lever assembly being pivotally connected to the second pivot portion;

[0009] When the switching drive moves toward the first direction, it drives the closing pull rod assembly to move toward the first direction, causing the connecting rod assembly to enter the second state from the first state; when the switching drive moves toward the second direction, it drives the connecting rod assembly to enter the first state, and the second pivot portion drives the closing pull rod assembly to move toward the second direction.

[0010] In some embodiments, the linkage assembly includes a first rod and a second rod, the second rod being located on the proximal side of the first rod, the first rod including a first pivot portion and a third pivot portion, the second rod including a second pivot portion and a fourth pivot portion, the third pivot portion being pivotally connected to the fourth pivot portion;

[0011] When the linkage assembly transitions from the first state to the second state, the third pivot and the fourth pivot move toward a third direction; when the switching drive moves toward the second direction, the switching drive drives the third pivot and the fourth pivot to move toward a fourth direction, which is opposite to the fourth direction.

[0012] In some embodiments, a connecting rod is also included, wherein the third direction is a direction toward the connecting rod, and the fourth direction is a direction away from the connecting rod;

[0013] The switching drive includes a first drive part and a first outer sleeve part. The first outer sleeve part is sleeved on the outside of the connecting rod or the outside of the closing pull rod assembly. The first drive part is located on the side of the first outer sleeve part facing the connecting rod assembly. When the first outer sleeve part moves in the first direction, it drives the closing pull rod assembly to move in the first direction, so that the connecting rod assembly enters the second state from the first state.

[0014] 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. Both the first direction and the second direction are along the axial direction of the stapler.

[0015] In some embodiments, a second driving part is provided on the first rod or the second rod, and when the connecting rod assembly is in the second state, the second driving part protrudes relative to the first rod or the second rod in the direction toward the connecting rod;

[0016] When the linkage assembly is in the second state and the switching drive moves toward the second direction, the switching drive presses the second drive part away from the connecting rod, causing the linkage assembly to enter the first state.

[0017] In some embodiments, the switching drive moves toward the first direction such that after the linkage assembly enters the second state from the first state, the first drive portion is located on the proximal side of the second drive portion.

[0018] In some embodiments, a first guide surface is provided on the distal side of the first driving portion, and / or a second guide surface is provided on the proximal side of the second driving portion.

[0019] In some embodiments, the second drive portion is disposed on the third pivot portion or the fourth pivot portion.

[0020] In some embodiments, the switching drive includes two first drive units, which are symmetrically arranged with respect to the axial direction of the stapler; the linkage assembly is provided with two second drive units.

[0021] When the linkage assembly is in the second state and the switching drive moves in the second direction, each of the first drive parts presses against a second drive part.

[0022] In some embodiments, the first drive portion is a drive arm extending from the first outer sleeve portion in the second direction.

[0023] In some embodiments, the closing lever assembly includes a second outer sleeve and a third drive portion. The second outer sleeve is fitted over the outside of the connecting rod, and the first outer sleeve of the switching drive component cooperates with the second outer sleeve. The first end of the third drive portion is pivotally connected to the second pivot portion, and the second end of the third drive portion is fixedly connected to the second outer sleeve.

[0024] In some embodiments, a switching bias member is provided between the switching drive member and the anastomosis device body, and the switching bias member provides the switching drive member with a first bias force toward the first direction.

[0025] In some embodiments, the switching biasing member is a switching reset spring, and a spring mating groove is provided on one side of the first outer sleeve, with one end of the switching reset spring disposed in the spring mating groove.

[0026] In some embodiments, a closing bias member is provided between the closing lever assembly and the anastomosis device body, the closing bias member providing the closing lever assembly with a second biasing force toward the second direction.

[0027] In some embodiments, the closing lever assembly includes a first closing member and a second closing member. The first closing member is sleeved on the outside of the connecting rod. The second closing member includes a second outer sleeve and the driving part. The first closing member is axially fixed to the second outer sleeve, and the portion of the first closing member protruding from the distal side of the second outer sleeve passes through the interior of the first outer sleeve of the switching drive member.

[0028] In some embodiments, the closing biasing member is a closing return spring, and the first closing member has a spring-fitting stepped surface inside, with one end of the closing return spring abutting against the spring-fitting stepped surface.

[0029] In some embodiments, the switching drive includes an operating part that protrudes from the outer surface of the housing of the anastomosis device body, and the housing is provided with a receiving groove for accommodating the operating part.

[0030] In some embodiments, a closing tab is further included, the proximal side of which is connected to the closing pull rod assembly via a connecting pin.

[0031] This invention also provides a medical stapler, including the aforementioned closure switching mechanism.

[0032] The closure switching mechanism and medical stapler provided by this invention have the following advantages:

[0033] This invention provides a closure switching mechanism for a medical stapler. By operating the switching drive, the linkage assembly can be switched between different states without using the stapler handle, and the closure pull rod assembly can be controlled to move along the axial direction of the stapler. When the closure pull rod assembly moves in the first direction, the staple head can be closed; when the closure pull rod assembly moves in the second direction, the staple head can be opened. Thus, manual closure and manual opening of the staple head can be realized. The structure is simple and the operation is convenient. Attached Figure Description

[0034] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0035] Figure 1 This is a schematic diagram of the structure of a stapler according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of a nail head according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the anastomosis device body after removing one side of the housing according to an embodiment of the present invention, wherein the connecting rod assembly is in a first state and the switching drive is in a first position range;

[0038] Figure 4 This is a schematic diagram of the structure of the connecting rod assembly and the closing tie rod assembly according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of the linkage assembly, the closing pull rod assembly, and the switching drive component according to an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the structure of a closed switching mechanism according to an embodiment of the present invention, wherein the linkage assembly is in a second state and the switching drive is in a second position range;

[0041] Figure 7 This is a schematic diagram of the connection of the linkage assembly and the second closing member according to an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the structure of a closed pull rod assembly according to an embodiment of the present invention;

[0043] Figure 9 This is an exploded view of a closed pull rod assembly according to an embodiment of the present invention;

[0044] Figure 10 This is a schematic diagram of the structure of the first closure member according to an embodiment of the present invention;

[0045] Figure 11 This is a schematic diagram of the cooperation between a closed pull rod assembly and a switching drive component according to an embodiment of the present invention;

[0046] Figure 12 This is a schematic diagram of the structure of a switching drive component according to an embodiment of the present invention;

[0047] Figure 13 This is a schematic diagram of the structure of a closed switching mechanism according to an embodiment of the present invention, wherein the linkage assembly is in a second state and the switching drive member moves to a first position range;

[0048] Figure 14 This is a schematic diagram of the structure of a closed switching mechanism according to an embodiment of the present invention, wherein the linkage assembly is in a first state and the switching drive is in a first position range.

[0049] Figure label:

[0050] 1. Anastomosis device body; 5. Closure lever assembly

[0051] 11 Fixed handle 51 First closing element

[0052] 12 Closed pull tab 511 Through hole

[0053] 13 Housing 512 Spring mating stepped surface

[0054] 131 Guide groove 52 Second closing element

[0055] 14 Stop section 521 Second outer cover section

[0056] 15 Handle return spring 5211 Switching mating surface

[0057] 18 Connecting rod 522 Third drive unit

[0058] 2. Actuator rod 5221 guide section

[0059] 21 Rack 5222 Mating Hole

[0060] 3. Firing handle 61. Closing return spring

[0061] 31 Claw 62 Switching Reset Spring

[0062] 4 Linkage assembly 7 Switching drive

[0063] 41 First stroke 71 First outer sleeve

[0064] 412 First pivot part 711 Spring mating groove

[0065] 413 Third pivot section 72 First drive section

[0066] 42 Second stroke 721 First guiding surface

[0067] 422 Second pivot part 73 Operating part

[0068] 423 Fourth pivot part 9 Nail head

[0069] 43 First pin 91 Anvil

[0070] 44 Second pin 911 First mating groove

[0071] 45 Third pin shaft 92 Pin cartridge assembly

[0072] 46 Second drive unit 921 Second mating groove

[0073] 461 Second guide surface 93 Closing pin Detailed Implementation

[0074] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention 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 therefore repeated descriptions of them will be omitted.

[0075] This invention provides a closure switching mechanism for a medical stapler and a medical stapler including the closure switching mechanism. The stapler further includes a staple head and a stapler body. The staple head is disposed at the distal end of the stapler body, and the stapler body has a closure pull tab for closing the staple head, the distal end of which is connected to the staple head. The closure switching mechanism includes: a linkage assembly including a first pivot portion and a second pivot portion, the first pivot portion being pivotally connected to the stapler body, the linkage assembly having a first state and a second state; a switching drive member movable along a first direction and a second direction, the first direction being opposite to the second direction; and a closure pull rod assembly pivotally connected to the second pivot portion.

[0076] When the staple head of the stapler needs to be closed, operating the switching drive to move it in the first direction drives the closing lever assembly to move in the first direction, which in turn pulls the closing tab in the first direction, thereby closing the staple head and causing the connecting rod assembly to enter the second state from the first state. After the staple head is closed, the stapler can be fired. After the stapler is fired, when it is necessary to open the staple head, operating the switching drive to move it in the second direction drives the connecting rod assembly into the first state, and the second pivot drives the closing lever assembly to move in the second direction to open the staple head. This allows for manual closing and opening of the staple head, with a simple structure and convenient operation.

[0077] The structure of the closing switching mechanism of various specific embodiments of the present invention will be 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.

[0078] like Figures 1-14 As shown, the present invention provides a closure switching mechanism for a medical stapler and a medical stapler including the closure switching mechanism. Figure 1 As shown, the stapler also includes a staple head 9 and a stapler body 1, with the staple head 9 disposed at the distal end of the stapler body 1. The stapler body 1 includes a housing 13, with a fixing handle 11 disposed on one side of the housing 13. A closing tab 12 for closing the staple head 9 is disposed inside the stapler body 1, with the distal end of the closing tab 12 connected to the staple head 9.

[0079] In this invention, the distal and proximal sides are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, i.e., closer to the surgical position, is the distal side. The direction along the axis of the stapler is the axial direction, i.e., the direction from the distal side to the proximal side of the stapler, or the direction from the proximal side to the distal side of the stapler. For example, in Figure 1 From the perspective of the stapler, its distal side is the left side and its 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, or the direction opposite to the S1 direction, is defined as the axis of the stapler. Figure 3 In this context, S2 is the longitudinal direction, i.e., the height direction.

[0080] like Figure 2 As shown, the nail head 9 includes an anvil 91 and a nail cartridge assembly 92 disposed opposite to each other. The proximal end of the anvil 91 is rotatably connected to the proximal end of the nail cartridge assembly 92, allowing the anvil 91 to be in an open state and a closed state relative to the nail cartridge assembly 92. Specifically, the proximal end of the anvil 91 is provided with a first mating groove 911, and the proximal end of the nail cartridge assembly 92 is provided with an axially extending second mating groove 921. A closing pin 93 passes through the first mating groove 911, the second mating groove 921, and the distal end of the closing tab 12. When the closing tab 12 moves towards the proximal end, the closing pin 93 also moves towards the proximal end, causing the anvil 91 to move toward the nail cartridge assembly 92 and close the nail head 9. When the closing tab 12 moves towards the distal end, the closing pin 93 also moves towards the distal end, causing the anvil 91 to move away from the nail cartridge assembly 92 and open the nail head 9.

[0081] like Figures 3-5As shown, the closure switching mechanism includes a linkage assembly 4, a switching drive component 7, and a closure pull rod assembly 5. The linkage assembly 4 includes a first rod 41 and a second rod 42, with the second rod 42 located proximal to the first rod 41. The first rod 41 includes a first pivot portion 412 and a third pivot portion 413, and 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, such that the first pivot portion 412 and the housing 13 of the stapler body 1 are axially fixed relative to each other. The third pivot portion 413 is pivotally connected to the fourth pivot portion 423 via the second pin 44, and the second pivot portion 422 is pivotally connected to the closing pull rod assembly 5 via the third pin 45, so that the second pivot portion 422 and the closing pull rod assembly 5 are relatively fixed in the axial direction. The closing pull rod assembly 5 is fixedly connected to the proximal side of the closing pull tab 12, so that the axial movement of the closing pull rod assembly 5 can drive the axial movement of the closing pull tab 12.

[0082] 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 includes a first position region and a second position region. In the initial state, the linkage assembly 4 is in the first state, which is a relatively compact state, i.e., the axial distance between the first pivot 412 and the second pivot 422 is small, and the switching drive 7 is in the first position region. When it is necessary to drive the nail head 9 to close, by driving the switching drive 7 to move in the first direction, the closing pull rod assembly 5 is driven to move in the proximal direction of the stapler, and the second pivot 422 is driven to move in the proximal direction of the stapler. The third pivot 413 and the fourth pivot 423 move in the third direction, and the linkage assembly 4 enters the second state, which is a relatively extended state. The axial distance between the first pivot 412 and the second pivot 422 increases. At the same time, the closing pull rod assembly 5 drives the closing pull tab 12 to move in the proximal direction to close the nail head 9. When the switching drive 7 moves to the second position area, the nail head 9 closes completely.

[0083] After the staple head 9 is closed, the linkage assembly 4 is in a relatively stable second state, and the switching drive 7 is located in the second position area. At this time, the stability of the staple head 9 closure can be maintained, and the stapler can be fired. During the firing of the stapler, there will be no accidental movement of the closing pull tab 12 that would affect the stability of the staple head 9 closure. After the stapler is fired, when it is necessary to open the staple head 9, the switching drive 7 is operated to move from the second position area toward the second direction. The switching drive 7 presses the linkage assembly 4 in the fourth direction, which can drive the linkage assembly 4 from the second state to the first state. The second pivot part 422 of the linkage assembly 4 drives the closing pull rod assembly 5 to move toward the distal side. The closing pull rod assembly 5 can drive the closing pull tab 12 to move toward the distal side to open the staple head 9, thereby realizing the manual opening of the staple head 9. The structure is simple and the operation is convenient.

[0084] The following is combined with Figures 3-14 The structure and working principle of the closure switching mechanism of the present invention are described in detail. In this embodiment, the second position region of the switching drive 7 is located on the proximal side of the first position region; therefore, the first direction is the direction toward the proximal side of the stapler. Figure 3 The first direction is in the S1 direction, and the second direction is towards the distal end of the stapler (opposite to the S1 direction). Both the first and second directions are axial directions along the stapler. When the switching drive 7 moves from the first position region towards the proximal side, it can drive the closing staple head; when the switching drive 7 moves from the second position region towards the distal side, it can drive the opening staple head. The first position region refers to... Figures 3-5 The position area of ​​the switching drive 7 in the initial state shown, the second position area refers to, as shown in the figure Figure 6 The position area where the switching drive 7 is located after the nail head is closed, as shown.

[0085] like Figures 3-5The diagram shown is a structural schematic of the closure switching mechanism in its initial state according to this embodiment. The closure switching mechanism also includes a connecting rod 18. The closure pull tab 12 passes through the interior of the connecting rod 18. An actuating rod 2, the switching drive component 7, and the closure pull rod assembly 5 are sleeved on the connecting rod 18. The stapler also includes a firing handle 3, which is pivotally connected to the housing 13 of the stapler body 1 and connected to a handle return spring 15. One end of the firing handle 3 is provided with a pawl 31, which engages with a rack 21 on one side of the actuating rod 2. During the firing of the stapler, by holding the firing handle 3, the pawl 31 of the firing handle 3 can drive the rack 21 to move towards the distal end, thereby firing the stapler. In this embodiment, the third direction is... Figure 3 From a bottom-up perspective, that is, for the third pivot 413 and the fourth pivot 423, the direction towards the connecting rod 18. The fourth direction is... Figure 3 From a top-down perspective, that is, for the third pivot 413 and the fourth pivot 423, the direction away from the connecting rod 18. Figures 3-5 In this state, the third pivot 413 and the fourth pivot 423 are positioned relatively far from the connecting rod 18, and the connecting rod assembly 4 is in a relatively stable first state, with a small axial distance between the first pivot 412 and the second pivot 422. The switching drive 7 is located in the first position region.

[0086] like Figures 3-5 As shown, the switching drive 7 includes an operating part 73, a first drive part 72, and a first outer sleeve part 71. The operating part 73 is connected to the first outer sleeve part 71 and protrudes from the outer surface of the housing 13 of the stapler body 1 for convenient use by the operator. The housing 13 is provided with a corresponding receiving groove to accommodate the operating part 73. The operating part 73 is partially located in the receiving groove and partially protrudes from the outside of the housing 13. The first outer sleeve part 71 is fitted onto the outside of the connecting rod 18 or the outside of the closing pull rod assembly 5 and can move axially relative to the connecting rod 18. The first drive part 72 is located on the side of the first outer sleeve part 71 facing the connecting rod assembly 4. The third pivot part 413 of the first rod 41 is provided with a second drive part 46, which protrudes from the surface of the first rod 41 facing the connecting rod 18. The connecting rod assembly 4 is in the second state (e.g. Figure 6In the state shown, the second drive portion 46 protrudes towards the connecting rod 18 relative to the first rod 41 or the second rod 42. In the initial state, the second drive portion 46 is located relatively far away from the connecting rod 18 along with the third pivot portion 413, and will not contact the first drive portion 72, so the first drive portion 72 will not apply force to the second drive portion 46.

[0087] like Figures 3-5 As shown, the closing lever assembly 5 includes a first closing member 51 and a second closing member 52. The first closing member 51 is sleeved on the outside of the connecting rod 18. The second closing member 52 includes a second outer sleeve 521 and a third driving part 522. The proximal end of the first closing member 51 at least partially enters the second outer sleeve 521. The first closing member 51 is axially fixed to the second outer sleeve 521, and the distal end of the first closing member 51 protruding from the second outer sleeve 521 passes through the interior of the first outer sleeve 71 of the switching drive member 7. A through hole 511 is provided on the distal end of the first closing member 51, through which a connecting pin (shown in the figure) passes. Figure 9 The distal end of the first closure member 51 can be fixedly connected to the proximal end of the closure pull tab 12. The first end of the third drive part 522 is pivotally connected to the second pivot part 422 of the second rod 42, and the second end of the third drive part 522 is connected to the second outer sleeve part 521. One or two guide parts 5221 are provided on the side of the third drive part 522. One or two guide grooves 131 are provided on the inner surface of the housing 13 of the stapler body 1. The guide grooves 131 extend in the axial direction, and the guide parts 5221 at least partially enter the guide grooves 131 and can move along the extension direction of the guide grooves 131. The cooperation of the guide parts 5221 and the guide grooves 131 limits the movement of the second closure member 52 to only in the axial direction. In other alternative embodiments, guide parts can also be provided on the inner surface of the housing 13 of the stapler body 1, and guide grooves can be provided on the side of the third drive part 522, which is also within the protection scope of this invention.

[0088] like Figures 3-5As shown, the first outer sleeve 71 of the switching drive 7 is located at the distal end of the second outer sleeve 521 of the second closure 52. The distal surface of the second outer sleeve 521 is a switching mating surface 5211, which abuts against the proximal surface of the first outer sleeve 71 of the switching drive 7. A switching biasing member is provided between the switching drive 7 and the anastomosis device body 1, and the switching biasing member provides the switching drive 7 with a first biasing force in the proximal direction. In this embodiment, the switching biasing member is a switching return spring 62, and may be a compression spring disposed on the distal end of the switching drive 7. In other alternative embodiments, the switching biasing member may also be a spring sheet, a tension spring disposed on the proximal end of the switching drive 7, or other types of elastic members.

[0089] like Figures 3-5 As shown, a stop portion 14 is provided inside the housing 13 of the anastomosis device body 1. A closing bias member is provided between the closing lever assembly 5 and the stop portion 14, and the closing bias member provides the closing lever assembly 5 with a second biasing force in the distal direction. In this embodiment, the closing bias member is a closing return spring 61, and may be a compression spring disposed on the proximal side of the closing lever assembly 5. In other alternative embodiments, the closing bias member may also be a spring sheet, a tension spring disposed on the distal side of the closing lever assembly 5, or other types of elastic members.

[0090] exist Figures 3-5 In the illustrated state, when the linkage assembly 4 is in the first state, the closing return spring 61 undergoes essentially no deformation or only minor deformation. Under the action of the second biasing force of the closing return spring 61, the closing pull rod assembly 5 abuts against the switching drive member 7, holding the switching drive member 7 in the first position region. The first biasing force of the switching return spring 62 is insufficient to overcome the second biasing force of the closing return spring 61; therefore, the switching return spring 62 undergoes compressive deformation. Through the action of the closing return spring 61, the switching drive member 7 can be further prevented from moving towards the proximal side under the action of the switching return spring 62, further maintaining the stability of the closing switching mechanism when no external force is applied. Figure 5 As shown, in the initial state, the axial length of the closed reset spring 61 is L11, and the axial length of the switching reset spring 62 is L21.

[0091] exist Figures 3-5In the shown state, operating the operation part 73 of the switching drive 7 causes the switching drive 7 to move from the first position region toward the first direction. The first outer sleeve 71 acts on the second outer sleeve 521, causing the entire closing lever assembly 5 to move toward the proximal side of the stapler. The closing lever assembly 5 drives the second pivot part 422 to move toward the first direction via the third drive part 522. The third pivot part 413 and the fourth pivot part 423 move toward the third direction, that is, move upward and approach the connecting rod 18. The first rod 41 rotates counterclockwise around the first pivot axis 43, and the second rod 42 rotates clockwise around the third pivot axis 45. The connecting rod assembly 4 enters the second state. At this time, the state of the closing switching mechanism is as follows: Figure 6 As shown. Comparison Figure 6 and Figure 5 As can be seen, the switching drive moves proximally to the second position region, and the axial length of the switching return spring 62 extends to L22, which is greater than L21. The third drive part 522 of the second closing member 52 moves proximally, driving the closing pull tab 12 to move proximally through the first closing member 51, closing the nail head 9. The closing return spring 61 is compressed and deformed, and its axial length shortens to L12, which is less than L11. The first drive part 72 is located proximally to the second drive part 46 and does not act on the second drive part 46. At this time, the linkage assembly 4 is in a relatively stable second state, and under the action of the linkage assembly 4, the closing return spring 61, and the switching return spring 62, the closing pull rod assembly 5 and the switching drive 7 are also in a relatively stable state, thereby maintaining the stability of the nail head 9 after closing. At this time, holding the firing handle 3, the stapler can be fired by driving the rack 21.

[0092] like Figures 7-11 As shown, the first drive unit 72 is a drive arm extending from the first outer sleeve 71 toward the distal end of the stapler. The third pivot portion 413 of the first rod 41 is provided with two second drive units 46, and the switching drive member 7 includes two first drive units 72, which are symmetrically arranged with respect to the axial direction of the stapler. Figures 7-10As shown, the first closing member 51 and the second closing member 52 are two separate components. At least a portion of the proximal side of the first closing member 51 enters the second outer sleeve 521 of the second closing member 52 and mates with the stepped surface within the second outer sleeve 521, forming an axially fixed and relatively rotatable fit. The guide portion 5221 is a protrusion provided on the side of the third driving portion 522. The distal side of the third driving portion 522 is provided with a mating hole 5222 for mounting the third pin 45. The interior of the first closing member 51 is provided with a spring-fitted stepped surface 512, and one end of the closing return spring 61 abuts against the spring-fitted stepped surface 512. Figure 12 As shown, the distal end face of the first outer sleeve 71 is provided with a spring mating groove 711, and one end of the switching reset spring 62 is disposed in the spring mating groove 711.

[0093] In other alternative embodiments, the first closure member 51 and the second closure member 52 may also be integrally formed. In other alternative embodiments, the second driving part 46 may also have other shapes, and the number of the second driving part 46 and the first driving part 72 is not limited to two; for example, only one second driving part 46 and one first driving part 72 may be provided. The installation position and method of the closing return spring 61 and the switching return spring 62 may also differ from this embodiment. In other alternative embodiments, the second driving part 46 may also be provided at the fourth pivot part 423, or at other positions of the first rod 41 or the second rod 42. In other alternative embodiments, the guide part 5221 may also be a boss or other structure.

[0094] exist Figure 6 In the shown state, the stapler can be fired by holding the firing handle 3. During the firing process, under the stabilizing effect of the linkage assembly 4 itself and the holding effect of the closing return spring 61 and the switching return spring 62, the states of the linkage assembly 4, the closing pull rod assembly 5, and the switching drive 7 will not change. That is, the linkage assembly 4 remains in the second state, the switching drive 7 remains in the second position region, and the closing pull tab 12 will not experience unexpected axial movement, maintaining the stable closure of the staple head 9. After the stapler is fired, when it is necessary to open the staple head 9, the operator operates the operating part 73 protruding from the housing 13, driving it to move towards the distal side, so that the switching drive 7 moves from the second position region toward the distal side of the stapler to the first position region, compressing the switching return spring 62, so that the axial length of the switching return spring 62 is shortened to the initial length L21, entering... Figure 13The first drive unit 72 moves distally to above the second drive unit 46, and gives the second drive unit 46 a state along the fourth direction ( Figure 13 Under the influence of a downward force (i.e., away from the connecting rod 18), the third pivot 413 and the fourth pivot 423 move downward and enter... Figure 14 The state shown indicates that the linkage assembly 4 has returned to its initial first state. Figure 7 and Figure 11 As shown, in this embodiment, a first guide surface 721 is provided on the distal side of the first driving part 72, and the upper side of the first guide surface 721 is inclined towards the distal side compared to the lower side. A second guide surface 461 is provided on the proximal side of the second driving part 46, and the inclination direction of the second guide surface 461 is the same as that of the first guide surface 721. By providing the first guide surface 721 and the second guide surface 461, when the first driving part 72 moves from the second position region to the first position region, the first driving part 72 can more smoothly contact the second driving part 46 and press the second driving part 46 downward.

[0095] Compare Figure 13 and Figure 14 As can be seen, during the process of the linkage assembly 4 returning from the second state to the first state, the first rod 41 rotates clockwise around the first pivot 43, and the second rod 42 rotates counterclockwise around the second pivot 44. The second pivot portion 422 moves towards the distal end, driving the third driving portion 522 of the second closing member 52 to move towards the distal end. Under the driving action of the second pivot portion 422 and the elastic restoring action of the closing return spring 61, the second outer sleeve portion 521 moves towards the distal end until it re-aggregates with the switching drive member 7, and the closing return spring 61 extends back to its initial length L11. The second closing member 52 drives the closing pull tab 12 towards the distal end through the first closing member 51, thereby opening the nail head 9. Therefore, after the stapler is fired, by operating the switching drive 7, the operating part 73 moves to the distal side, which drives the connecting rod assembly 4 from the second state to the first state, and drives the closing pull rod assembly 5 to move to the distal side to open the staple head 9. Thus, the staple head 9 can be opened manually. The structure is simple and the operation is convenient.

[0096] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A closed-loop switching mechanism, characterized in that, A medical stapler, the stapler comprising a stapler body, the closure switching mechanism comprising: The linkage assembly includes a first pivot portion and a second pivot portion, wherein the first pivot portion is pivotally connected to the anastomosis device body, and the linkage assembly includes a first state and a second state. A switching drive unit is available to move along a first direction and a second direction, wherein the first direction is opposite to the second direction and both the first direction and the second direction are along the axial direction of the stapler. A closing lever assembly, the closing lever assembly being pivotally connected to the second pivot portion; When the linkage assembly is in the first state, the switching drive member abuts against the closing pull rod assembly; when the switching drive member moves toward the first direction, it drives the closing pull rod assembly to move in the first direction, and the closing pull rod assembly drives the linkage assembly from the first state to the second state; when the switching drive member moves toward the second direction, it drives the linkage assembly to enter the first state, and the second pivot portion drives the closing pull rod assembly to move in the second direction.

2. The closed switching mechanism according to claim 1, characterized in that, The linkage assembly includes a first rod and a second rod, the second rod being located on the proximal side of the first rod, the first rod including a first pivot portion and a third pivot portion, the second rod including a second pivot portion and a fourth pivot portion, the third pivot portion being pivotally connected to the fourth pivot portion; When the linkage assembly transitions from the first state to the second state, the third pivot and the fourth pivot move toward a third direction; when the switching drive moves toward the second direction, the switching drive drives the third pivot and the fourth pivot to move toward a fourth direction, which is opposite to the fourth direction.

3. The closing switching mechanism according to claim 2, characterized in that, It also includes a connecting rod, wherein the third direction is the direction toward the connecting rod, and the fourth direction is the direction away from the connecting rod; The switching drive includes a first drive part and a first outer sleeve part. The first outer sleeve part is sleeved on the outside of the connecting rod or the outside of the closing pull rod assembly. The first drive part is located on the side of the first outer sleeve part facing the connecting rod assembly. When the first outer sleeve part moves in the first direction, it drives the closing pull rod assembly to move in the first direction, so that the connecting rod assembly enters the second state from the first state.

4. The closing switching mechanism according to claim 3, characterized in that, The first direction is toward the proximal side of the stapler, and the second direction is toward the distal side of the stapler.

5. The closing switching mechanism according to claim 4, characterized in that, A second driving part is provided on the first rod or the second rod. When the connecting rod assembly is in the second state, the second driving part protrudes in the direction of the connecting rod relative to the first rod or the second rod. When the linkage assembly is in the second state and the switching drive moves toward the second direction, the switching drive presses the second drive part away from the connecting rod, causing the linkage assembly to enter the first state.

6. The closing switching mechanism according to claim 5, characterized in that, The switching drive moves toward the first direction, so that after the linkage assembly enters the second state from the first state, the first drive part is located on the proximal side of the second drive part.

7. The closing switching mechanism according to claim 5, characterized in that, The first driving unit has a first guide surface at its distal end, and / or the second driving unit has a second guide surface at its proximal end.

8. The closing switching mechanism according to claim 5, characterized in that, The second drive unit is disposed on the third pivot unit or the fourth pivot unit.

9. The closing switching mechanism according to claim 5, characterized in that, The switching drive includes two first drive units, which are symmetrically arranged with respect to the axis of the anastomosis device; the linkage assembly is provided with two second drive units. When the linkage assembly is in the second state and the switching drive moves in the second direction, each of the first drive parts presses against a second drive part.

10. The closing switching mechanism according to claim 3, characterized in that, The first drive unit is a drive arm that extends from the first outer sleeve in the second direction.

11. The closing switching mechanism according to claim 4, characterized in that, The closing pull rod assembly includes a second outer sleeve and a third drive part. The second outer sleeve is sleeved on the outside of the connecting rod, and the first outer sleeve of the switching drive part cooperates with the second outer sleeve. The first end of the third drive part is pivotally connected to the second pivot part, and the second end of the third drive part is fixedly connected to the second outer sleeve.

12. The closing switching mechanism according to claim 11, characterized in that, A switching bias member is provided between the switching drive member and the anastomosis device body, and the switching bias member provides the switching drive member with a first bias force in the first direction.

13. The closing switching mechanism according to claim 12, characterized in that, The switching biasing component is a switching reset spring. A spring mating groove is provided on one side of the first outer sleeve, and one end of the switching reset spring is disposed in the spring mating groove.

14. The closing switching mechanism according to claim 12, characterized in that, A closing biasing member is provided between the closing lever assembly and the anastomosis device body, and the closing biasing member provides the closing lever assembly with a second biasing force in the second direction.

15. The closing switching mechanism according to claim 14, characterized in that, The closing lever assembly includes a first closing member and a second closing member. The first closing member is sleeved on the outside of the connecting rod. The second closing member includes a second outer sleeve and a third driving part. The first closing member is axially fixed to the second outer sleeve, and the portion of the first closing member protruding from the distal side of the second outer sleeve passes through the interior of the first outer sleeve of the switching drive member.

16. The closing switching mechanism according to claim 15, characterized in that, The closing biasing member is a closing return spring. The first closing member has a spring-fitting stepped surface inside, and one end of the closing return spring abuts against the spring-fitting stepped surface.

17. The closing switching mechanism according to claim 1, characterized in that, The switching drive includes an operating part that protrudes from the outer surface of the housing of the anastomosis device body, and the housing is provided with a receiving groove to accommodate the operating part.

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

19. A medical stapler, characterized in that, Includes the closing switching mechanism as described in any one of claims 1 to 18.

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