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; a closure pull rod assembly pivotally connected to the second pivot portion; and a switching drive member pivotally connected to the closure pull rod assembly. When the switching drive member moves toward a first moving direction, it drives the closure pull rod assembly to move in the first moving direction, causing the linkage assembly to transition from a first state to a second state. When the switching drive member rotates relative to the closure pull rod assembly along a first rotation direction, it drives the linkage assembly into the first state, and the second pivot portion drives the closure pull rod assembly and the switching drive member to move in the second moving 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 closure switching mechanism comprising:

[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] The closing pull rod assembly is pivotally connected to the second pivot joint;

[0008] A switching drive is pivotally connected to the closing lever assembly. The switching drive can move along a first moving direction and a second moving direction, wherein the first moving direction is opposite to the second moving direction.

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

[0010] In some embodiments, the switching drive includes a first drive part and a rotary engagement part, the rotary engagement part being pivotally connected to the closing lever assembly via a rotating shaft, and the linkage assembly including a second drive part;

[0011] When the linkage assembly is in the second state and the switching drive member rotates along the first rotation direction, the first drive unit drives the second drive unit, causing the linkage assembly to enter the first state.

[0012] In some embodiments, a connecting rod is further included. When the connecting rod assembly is in the second state and the switching drive member rotates along the first rotation direction, the first drive unit drives the second drive unit in a direction away from the connecting rod.

[0013] 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;

[0014] When the linkage assembly transitions from the first state to the second state, the third pivot and the fourth pivot move toward the connecting rod; when the switching drive rotates along the first rotation direction, the switching drive drives the third pivot and the fourth pivot to move away from the connecting rod.

[0015] In some embodiments, the second drive portion is disposed on the third pivot portion or the fourth pivot portion.

[0016] In some embodiments, when the linkage assembly is in the second state, the first drive portion is located on the side of the second drive portion facing the connecting rod, and there is a certain height gap between the surfaces of the first drive portion and the second drive portion facing each other.

[0017] In some embodiments, the switching drive further includes a first outer sleeve, and the closing lever assembly includes a second outer sleeve and a third drive portion. The first outer sleeve is fitted over the outside of the second outer sleeve, and the second outer sleeve is fitted over the outside of the connecting rod. The third drive portion is pivotally connected to the second pivot portion of the linkage assembly. When the second outer sleeve moves toward the first moving direction, it drives the linkage assembly from the first state to the second state.

[0018] In some embodiments, the first driving part is a driving arm extending from the rotary mating part in the second moving direction, the rotary mating part is a bent part connected between the first outer sleeve and the first driving part, and a fixed angle is provided between the first driving part and the first outer sleeve.

[0019] In some embodiments, the rotating engagement portion and the third drive portion of the closing pull rod assembly are pivotally connected via the rotating shaft.

[0020] In some embodiments, the third drive portion of the closing lever assembly is provided with at least one guide portion, and the inner surface of the housing of the stapler body is provided with at least one axially extending guide groove; or, the third drive portion is provided with at least one axially extending guide groove, and the inner surface of the housing of the stapler body is provided with at least one guide portion.

[0021] The guide portion enters the guide groove, and the guide portion can move along the extension direction of the guide groove.

[0022] In some embodiments, a closing bias member is provided between the second outer sleeve of the closing lever assembly and the anastomosis device body, the closing bias member providing the closing lever assembly with a first biasing force toward the second moving direction.

[0023] In some embodiments, a switching bias member is provided between the switching drive member and the closing lever assembly. When the switching drive member rotates relative to the closing lever assembly in a first rotation direction, the switching bias member deforms, giving the switching drive member a second bias force that rotates in a second rotation direction, the second rotation direction being opposite to the first rotation direction.

[0024] In some embodiments, the switching biasing element is a switching reset spring, the closing pull rod assembly is provided with a first spring mounting portion, the switching drive element is provided with a second spring mounting portion, the two ends of the switching reset spring are respectively fixed to the first spring mounting portion and the second spring mounting portion, and when not subjected to external force, the proximal end face of the switching drive element at least partially abuts against the closing pull rod assembly.

[0025] In some embodiments, the switching drive includes an operating part disposed on the first outer sleeve and protruding from the outer surface of the housing of the stapler body, and the housing is provided with a receiving groove for accommodating the operating part.

[0026] 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.

[0027] In some embodiments, the first moving direction and the second moving direction are along the axial direction of the stapler.

[0028] In some embodiments, the first moving direction is toward the proximal side of the stapler, and the second moving direction is toward the distal side of the stapler.

[0029] This invention also provides a medical stapler, including the aforementioned closure switching mechanism.

[0030] The closure switching mechanism and medical stapler provided by this invention have the following advantages:

[0031] 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, and the closure pull rod assembly can be controlled to move along the axial direction of the stapler. When the switching drive moves in the first moving direction, it can drive the closure pull rod assembly to move in the first moving direction to close the staple head. When the switching drive rotates in the first rotation direction, it can drive the closure pull rod assembly to move in the second moving direction to open the staple head. The structure is simple and the operation is convenient. Attached Figure Description

[0032] 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.

[0033] Figure 1 This is a schematic diagram of the structure of a medical stapler according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of a nail head according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the anastomosis device body with part of the shell removed according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of a closing switching mechanism according to an embodiment of the present invention;

[0037] Figure 5 and Figure 6This 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;

[0038] Figure 7 This is a schematic diagram of the closed switching mechanism when the linkage assembly is in the first state according to an embodiment of the present invention;

[0039] Figure 8 This is an exploded view of a closed switching mechanism according to an embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the closed switching mechanism when the linkage assembly is in the second state according to an embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the cooperation between the switching drive component and the linkage assembly according to an embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the closing switching mechanism when the switching drive unit rotates according to an embodiment of the present invention;

[0043] Figure 12 This is a schematic diagram of the closing switching mechanism when the switching drive rotates according to another embodiment of the present invention.

[0044] Figure label:

[0045] 1. Anastomosing device body 512 Spring-fitting stepped surface

[0046] 11 Fixed handle 513 Switching mating surface

[0047] 12 Closing pull tab 514 First spring mounting part

[0048] 13 Housing 52 Third Drive Unit

[0049] 14 Stop section 521 Guide section

[0050] 18 Connecting rod 522 First mating hole

[0051] 19 Connecting pin 523 Rotary shaft

[0052] 3. Firing handle 61. Closing return spring

[0053] 4. Linkage assembly 62. Switching and reset spring.

[0054] 41 First lever 7 Switching drive unit

[0055] 411 Second drive unit 71 First outer casing unit

[0056] 412 First pivot part 72 First drive part

[0057] 413 Third pivot section 73 Operating section

[0058] 414 Protrusion 74 Second Spring Mounting Part

[0059] 42 Second rod 75 Rotating mating part

[0060] 422 Second pivot part 751 Second mating hole

[0061] 423 Fourth pivot part 9 Nail head

[0062] 43 First pin 91 Anvil

[0063] 44 Second pin 911 First mating groove

[0064] 45 Third pin shaft 92 Pin cartridge assembly

[0065] 5. Closed tie rod assembly 921 Second mating groove

[0066] 51 Second outer casing 93 Closing pin

[0067] 511 Through Hole Detailed Implementation

[0068] 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.

[0069] 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 closure pull rod assembly pivotally connected to the second pivot portion; and a switching drive member pivotally connected to the closure pull rod assembly, the switching drive member being movable along a first moving direction and a second moving direction, the first moving direction being opposite to the second moving direction.

[0070] When the staple head of the stapler needs to be closed, operating the switching drive to move it in the first direction of movement drives the closing lever assembly to move in the first direction of movement, causing the connecting rod assembly to enter the second state from the first state. The closing lever assembly can then drive the closing tab to close the staple head. When the switching drive rotates relative to the closing lever assembly in the first rotation direction, it drives the connecting rod assembly into the first state, and the second pivot drives the closing lever assembly and the switching drive to move in the second direction of movement. The closing lever assembly can then drive the closing tab to open the staple head. Thus, by operating the switching drive, the connecting rod assembly can be switched between different states, and the closure lever assembly can be controlled to move along the axial direction of the stapler, thereby controlling the closing and opening of the staple head. The structure is simple and easy to use.

[0071] 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.

[0072] like Figures 1-11 As shown, one embodiment of 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, a stapler body 1, and a firing handle 3. The firing handle 3 is movably connected to the stapler body 1, and the staple head 9 is located on the distal side of the stapler body 1. The stapler body 1 includes a housing 13, and a fixing handle 11 is provided on one side of the housing 13. A closing tab 12 for closing the staple head 9 is provided inside the stapler body 1, and the distal side of the closing tab 12 is connected to the staple head 9.

[0073] 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 and / or the direction opposite to the S1 direction are defined as the axis of the stapler. Figure 3 In this context, S2 is the longitudinal direction, i.e., the height direction.

[0074] like Figure 2As 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.

[0075] like Figures 3-7 As 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, such that the second pivot portion 422 and the closing pull rod assembly 5 are axially fixed relative to each other. The closing pull rod assembly 5 is fixedly connected to the proximal side of the closing pull tab 12, such that the axial movement of the closing pull rod assembly 5 can drive the axial movement of the closing pull tab 12. The switching drive member 7 is pivotally connected to the closing pull rod assembly 5, and the pivotal connection position of the switching drive member 7 and the closing pull rod assembly 5 is fixed relative to the closing pull rod assembly 5 in the axial direction of the stapler. Here, "fixed in the axial direction of the stapler" means that the pivotal connection position of the switching drive member 7 and the closing pull rod assembly 5 will not be displaced axially relative to the closing pull rod assembly 5. The switching drive member 7 can move in a first moving direction and a second moving direction, which are two opposite directions.

[0076] 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 moving direction, the closing pull rod assembly 5 is driven to move in the first moving direction, and the second pivot 422 is driven to move in the first moving direction. The third pivot 413 and the fourth pivot 423 move in the third moving direction, and the linkage assembly 4 enters the second state. At this time, the linkage assembly 4 enters a relatively extended state, the axial distance between the first pivot 412 and the second pivot 422 increases, and at the same time, the closing pull rod assembly 5 drives the closing pull tab 12 to move in the first moving direction to close the nail head 9. When the switching drive 7 moves to the second position area, the nail head 9 closes completely.

[0077] After the nail 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, under the action of the linkage assembly 4, the stability of the nail head 9 closure can be maintained, and the stapler can be fired. During the firing of the stapler, the unexpected movement of the closing pull tab 12 will not affect the stability of the nail head 9 closure. After the stapler is fired, when it is necessary to open the nail head 9, the switching drive 7 is rotated relative to the closing pull rod assembly 5. The switching drive 7 drives the linkage assembly 4 in the fourth moving 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 in the second moving direction. The closing pull rod assembly 5 can drive the switching drive 7 to move along the second moving direction and return to the first position area. At the same time, the closing pull rod assembly 5 drives the closing pull tab 12 to move in the distal direction to open the nail head 9, thereby realizing the manual opening of the nail head 9. The structure is simple and the operation is convenient.

[0078] The following is combined with Figures 3-11 The structure and working principle of the closure switching mechanism in this embodiment are described in detail. In this embodiment, the second position region is located on the proximal side of the first position region. Both the first and second movement directions are along the axial direction of the stapler. Specifically, the first movement direction is towards the proximal side of the stapler. Figure 3The first position region refers to the direction of movement from the first position region (S1 direction), and the second movement direction is towards the distal side of the stapler (opposite to S1 direction). When the switching drive 7 moves from the first position region towards the proximal side, it can drive the staple head to close; when the switching drive 7 moves from the second position region towards the distal side, it can drive the staple head to open. The first position region refers to... Figure 7 The second position area refers to the location of the switching drive 7 in the initial state shown. Figure 9 The position area where the switching drive 7 is located after the nail head is closed, as shown.

[0079] like Figures 3-7 As shown, the closing switching mechanism further includes a connecting rod 18. The closing pull tab 12 passes through the interior of the connecting rod 18. In this embodiment, the third moving 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 moving direction is in 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. For example... Figure 7 The diagram shown is a structural schematic of the closing switching mechanism in the initial state of this embodiment. Figure 7 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.

[0080] like Figure 8As shown, the switching drive 7 includes an operating part 73, a first drive part 72, a first outer sleeve part 71, and a rotating engagement part 75. The operating part 73 is connected to the first outer sleeve part 71. The housing 13 is provided with a corresponding receiving groove to accommodate the operating part 73. The operating part 73 partially enters the receiving groove, can move relative to the receiving groove, and protrudes from the outer surface of the housing 13 of the anastomosis device body 1 for convenient use by the operator. The first outer sleeve part 71 is fitted onto 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 rotating engagement part 75 is provided between the first drive part 72 and the first outer sleeve part 71. The rotating engagement part 75 is pivotally connected to the closing pull rod assembly 5 through a rotating shaft 523. The rotating engagement part 75 is provided with a second engagement hole 751 passing through the rotating shaft 523. The first driving part 72 is a driving arm extending from the rotary mating part 75 toward the distal end of the stapler. The rotary mating part 75 is a bent portion connecting the first driving part 72 and the first outer sleeve part 71. A fixed angle is provided between the first driving part 72 and the first outer sleeve part 71, meaning the rotary mating part 75 is a bent portion that will not deform and preferably has a certain rigidity, so that the included angle (e.g., a right angle, or an angle less than or greater than a right angle) between the first driving part 72 and the first outer sleeve part 71 remains unchanged. A second driving part 411 is provided at the third pivot part 413 of the first rod 41. The second driving part 411 includes a mating surface facing the connecting rod 18. In the initial state, the second driving part 411 is located relatively far from the connecting rod 18 along with the third pivot part 413, and will not contact the first driving part 72, so the first driving part 72 will not apply force to the second driving part 411.

[0081] like Figure 3 , Figure 5 and Figure 8As shown, the closing pull rod assembly 5 includes a second outer sleeve 51 and a third drive part 52. The second outer sleeve 51 is sleeved on the outside of the connecting rod 18. The second outer sleeve 51 includes a distal portion and a proximal portion, with the outer diameter of the distal portion being 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 at least partially passes through the interior of the first outer sleeve 71 of the switching mating member 7, and the switching mating surface 513 of the second outer sleeve 51 mates with the proximal surface of the first outer sleeve 71. A through hole 511 is provided on the distal side of the second outer sleeve 51, and a connecting pin 19 passing through the through hole 511 of the second outer sleeve 51 can fix the distal side of the second outer sleeve 51 to the proximal side of the closing pull tab 12. The first end of the third drive part 52 is pivotally connected to the second pivot portion 422 of the second rod 42, and the second end of the third drive part 52 is connected to the second outer sleeve 51. The rotating shaft 523 passes through the third drive unit 52 and is pivotally connected to the rotating engagement part 75 of the switching drive member 7 via the rotating shaft 532. One or two guide parts 521 are provided on the side of the third drive unit 52. One or two guide grooves are provided on the inner surface of the housing 13 of the stapler body 1. The guide grooves extend axially, and the guide parts 521 at least partially enter the guide grooves and can move along the extension direction of the guide grooves. The cooperation between the guide parts 521 and the guide grooves limits the movement of the closing pull rod assembly 5 to only the axial direction. In other alternative embodiments, guide parts may also be provided on the inner surface of the housing 13 of the stapler body 1, and guide grooves may be provided on the side of the third drive unit 52; this also falls within the scope of protection of the present invention.

[0082] like Figure 4 , Figure 6 and Figure 8 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 pull rod assembly 5 and the stop portion 14, and the closing bias member provides the closing pull rod assembly 5 with a first 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 pull rod assembly 5. A spring-fitting stepped surface 512 is provided inside the second outer sleeve 51 of the closing pull rod assembly 5, and the closing return spring 61 is disposed between the spring-fitting stepped surface 512 and the stop portion 14. 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 pull rod assembly 5, or other types of elastic members.

[0083] exist Figure 7In 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 first biasing force of the closing return spring 61, the closing pull rod assembly 5 is held in its initial position, and the switching drive 7 is held in the first position region. The closing return spring 61 further maintains the stability of the closing switching mechanism when no external force is applied.

[0084] exist Figure 7 In the illustrated state, operating the operation part 73 of the switching drive 7 causes the switching drive 7 to move from the first position region in the first moving direction. The rotational mating part 75 of the switching drive 7 is axially fixed to the third drive part 52 at the position of the rotation axis 523. Therefore, the switching drive 75 can drive the third drive part 52 to move in the first moving direction. Furthermore, since the switching mating surface 513 of the second outer sleeve 51 mates with the proximal surface of the first outer sleeve 71, the first outer sleeve 71 can also act on the switching mating surface 513. This allows the switching drive 7 to apply a more uniform force to the closure lever assembly 5 in the proximal direction, driving the closure lever assembly 5 to move in the first moving direction, i.e., towards the proximal side of the stapler. The closure lever assembly 5 drives the second pivot part 422 to move in the first moving direction via the third drive part 52. The third pivot 413 and the fourth pivot 423 move in the third moving direction, that is, upward and closer to 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 pivot 412 and the second pivot 422 increases. At this time, the state of the closing switching mechanism is as follows: Figure 9 As shown. Comparison Figure 9 and Figure 7 It can be seen that when the switching drive 7 moves proximally to the second position region, the closing pull rod assembly 5 compresses the closing return spring 61, causing elastic deformation. Simultaneously, due to the movement of the third drive part 52 proximally, the second outer sleeve part 51 drives the closing pull tab 12 to move proximally, closing the pin head 9. Figure 9In this state, the first drive unit 72 is located on the side of the second drive unit 411 facing the connecting rod 18, and there is a certain height gap between the opposing surfaces of the first drive unit 72 and the second drive unit 411 in the longitudinal direction (i.e., the S2 direction). Therefore, the first drive unit 72 will not act on the second drive unit 411. Here, the opposing surfaces of the first drive unit 72 and the second drive unit 411 refer to the gap between the lower surface of the first drive unit 72 and the upper surface of the second drive unit 411. 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 pull rod assembly 5 and the switching drive member 7 are also in a relatively stable state, thereby maintaining the stability of the staple head 9 after closure. At this time, by holding the firing handle 3, the stapler can be fired by driving the rack (not shown) inside the stapler body.

[0085] like Figure 8 and Figure 10 As shown, the third pivot portion 413 of the first rod 41 is provided with the second driving portion 411. The switching driving member 7 includes two first driving portions 72. The second driving portion 411 includes two mating surfaces opposite to the two first driving portions 72, which are located on the left and right sides of the fourth pivot portion 423, respectively. The two first driving portions 72 are symmetrically arranged with respect to the axial direction of the stapler and correspond to the two mating surfaces of the second driving portion 411. The guide portion 521 is a protrusion provided on the side of the third driving portion 52, and one guide portion 521 can be provided on each of the left and right sides of the third driving portion 52. The distal end of the third driving portion 52 is provided with a first mating hole 522 for installing the third pin 45.

[0086] In other alternative embodiments, the number of the first drive portion 72 is not limited to two; for example, only one first drive portion 72 may be provided. The mounting 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 drive portion 411 may also be located at the fourth pivot portion 423, or at other positions of the first rod 41 or the second rod 42. In other alternative embodiments, the guide portion 521 may also be a boss or other structure.

[0087] like Figure 8 and Figure 9As shown, a switching biasing member is provided between the switching drive member 7 and the closing pull rod assembly 5. When the switching drive member 7 rotates in the first rotation direction, the switching biasing member undergoes elastic deformation, providing the switching drive member 7 with a second biasing force rotating in the second rotation direction. When the switching drive member 7 is not subjected to external force, the proximal end face of the switching drive member 7 at least partially abuts against the closing pull rod assembly 5. Specifically, the proximal end face of the first outer sleeve portion 71 of the switching drive member 7 at least partially abuts against the switching mating surface 513 of the second outer sleeve portion 51 of the closing pull rod assembly 5. Specifically, the surface of the first outer sleeve portion 71 of the switching drive member 7 is provided with a second spring mounting portion 74, and the proximal end portion of the first outer sleeve portion 51 of the closing pull rod assembly 5 is provided with a first spring mounting portion 514. The switching biasing member is a switching reset spring 62, which can be optionally a tension spring. The two ends of the switching reset spring 62 are respectively mounted on the first spring mounting portion 514 and the second spring mounting portion 74. In this embodiment, the first spring mounting portion 514 and the second spring mounting portion 74 are respectively a protrusion protruding from the surface of the second outer sleeve portion 51 and a protrusion protruding from the first outer sleeve portion 71. However, the present invention is not limited to this. In other alternative embodiments, the switching bias member may also be a torsion spring sleeved on the rotating shaft 523, or the switching bias member may be a tension spring or a compression spring, with both ends fixed to other positions of the switching drive member 7 and the closing pull rod assembly 5. In this embodiment, two switching bias members are provided, and the two switching bias members are symmetrically arranged with respect to the axial direction of the anastomosis device to act more evenly on the switching drive member 7. However, the present invention is not limited to this, and in other alternative embodiments, for example, only one switching bias member may be provided or more switching bias members may be provided.

[0088] exist Figure 9 In the shown state, the stapler can be fired by holding the firing handle 3. During the firing of the stapler, under the stabilizing effect of the linkage assembly 4 itself, the states of the linkage assembly 4, the closing lever 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, keeping the staple head 9 stably closed. 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 rotates relative to the closing lever assembly 5 about the rotation axis 523, and the rotation direction is the first rotation direction. In this embodiment, the first rotation direction is... Figure 9 The S3 direction shown in the figure is... Figure 9 The counter-clockwise direction from the perspective of [the viewpoint].

[0089] like Figure 11As shown, when the switching drive member 7 rotates along the first rotation direction, the first drive part 72 presses the second drive part 411 away from the connecting rod 18, causing the second drive part 411 to drive the third pivot part 413 and the fourth pivot part 423 to move in the fourth movement direction, that is, away from the connecting rod 18, so that the linkage assembly 4 enters the first state. During the process of the linkage assembly 4 returning from the second state to the first state, Figure 11 From the perspective of [the device], 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 pivot portion 422 moves in the second moving direction, that is, towards the distal end of the stapler. The second pivot portion 422 drives the third driving portion 52 to move towards the distal end, thereby causing the switching driving member 7 to also move towards the distal end to the first position area. At the same time, the second outer sleeve portion 51 drives the closing pull tab 71 to move towards the distal end, which can open the staple head. The closing return spring 61 also returns to its initial state, and the first biasing force of the closing return spring 61 further ensures that the closing pull rod assembly 5 can return to the initial position.

[0090] 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.

[0091] exist Figure 11 In this state, the switching reset spring 62 (not shown in the figure) is stretched and undergoes elastic deformation. At this time, the operator releases the operating part 73, and the operating part 73 loses its external force. Under the action of the second biasing force of the switching reset spring 62, the switching drive member 7 rotates back to the initial position along the second rotation direction (i.e., Figure 7 (The position and state of the switching drive 7 are shown in the diagram). In this embodiment, the second rotation direction is... Figure 11 The S4 direction shown in the figure is... Figure 11 The clockwise direction from the perspective of [the viewpoint].

[0092] like Figure 12As shown, in another embodiment of the present invention, the second driving part of the linkage assembly 4 can be a protrusion 414 disposed at the third pivot part 413, the protrusion 414 protruding relative to the first rod 41 towards the connecting rod 18. When the linkage assembly 4 is in the second state and the switching drive member 7 is not rotated by external force, there is a certain height gap between the lower surface of the first driving part 72 and the top end of the protrusion 414, and the switching drive member 7 will not act on the protrusion 414. When the linkage assembly 4 is in the second state and the switching drive member 7 rotates along the first rotation direction, the first driving part 72 of the switching drive member 7 directly acts on the protrusion 414, giving the protrusion 414 a force away from the connecting rod 18, so that the linkage assembly 4 returns to the first state. In another alternative embodiment, the protrusion 414 can also be disposed at the fourth pivot part or other positions of the linkage assembly 4, and the shape of the protrusion 414 is not limited to... Figure 12 The shape shown in the figure. The structure of other components in this embodiment is similar to... Figures 1-11 The components shown in the embodiment have the same structure, and will not be described again here.

[0093] 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, For use in medical staplers, the closure switching mechanism includes: The linkage assembly includes a first pivot portion, a second pivot portion, and a second drive portion. The first pivot portion is pivotally connected to the anastomosis device body. The linkage assembly includes a first state and a second state. The closing pull rod assembly is pivotally connected to the second pivot joint; The switching drive includes a first driving part and a rotating engagement part. The rotating engagement part is pivotally connected to the closing pull rod assembly via a rotating shaft. The switching drive can move along a first moving direction and a second moving direction, wherein the first moving direction is opposite to the second moving direction. When the switching drive moves toward the first moving direction, it drives the closing lever assembly to move in the first moving direction, so that the link assembly enters the second state from the first state; when the switching drive rotates relative to the closing lever assembly along the first rotation direction, the first drive part drives the second drive part to drive the link assembly into the first state, and the second pivot part drives the closing lever assembly and the switching drive to move in the second moving direction.

2. The closed switching mechanism according to claim 1, characterized in that, It also includes a connecting rod. When the connecting rod assembly is in the second state and the switching drive member rotates along the first rotation direction, the first drive unit drives the second drive unit in a direction away from the connecting rod.

3. The closing switching mechanism according to claim 2, 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 the connecting rod; when the switching drive rotates along the first rotation direction, the switching drive drives the third pivot and the fourth pivot to move away from the connecting rod.

4. The closing switching mechanism according to claim 3, characterized in that, The second drive unit is disposed on the third pivot unit or the fourth pivot unit.

5. The closing switching mechanism according to claim 2, characterized in that, When the linkage assembly is in the second state, the first drive part is located on the side of the second drive part facing the connecting rod, and there is a certain height gap between the surfaces of the first drive part and the second drive part.

6. The closed switching mechanism according to claim 2, characterized in that, The switching drive component further includes a first outer sleeve, and the closing lever assembly includes a second outer sleeve and a third drive part. The first outer sleeve is fitted outside the second outer sleeve, and the second outer sleeve is fitted outside the connecting rod. The third drive part is pivotally connected to the second pivot part of the linkage assembly. When the second outer sleeve moves toward the first moving direction, it drives the linkage assembly from the first state to the second state.

7. The closing switching mechanism according to claim 6, characterized in that, The first driving part is a driving arm extending from the rotating engagement part in the second moving direction. The rotating engagement part is a bent part connected between the first outer sleeve and the first driving part. A fixed angle is provided between the first driving part and the first outer sleeve.

8. The closed switching mechanism according to claim 6, characterized in that, The rotating mating part and the third drive part of the closing pull rod assembly are pivotally connected via the rotating shaft.

9. The closed switching mechanism according to claim 6, characterized in that, The third drive part of the closing lever assembly is provided with at least one guide part, and the inner surface of the housing of the stapler body is provided with at least one axially extending guide groove; or, the third drive part is provided with at least one axially extending guide groove, and the inner surface of the housing of the stapler body is provided with at least one guide part. The guide portion enters the guide groove, and the guide portion can move along the extension direction of the guide groove.

10. The closing switching mechanism according to claim 6, characterized in that, A closing bias member is provided between the second outer sleeve of the closing lever assembly and the anastomosis device body, and the closing bias member provides the closing lever assembly with a first biasing force in the second moving direction.

11. The closing switching mechanism according to claim 1, characterized in that, A switching bias member is provided between the switching drive member and the closing lever assembly. When the switching drive member rotates relative to the closing lever assembly in a first rotation direction, the switching bias member deforms, giving the switching drive member a second bias force that rotates in a second rotation direction, which is opposite to the first rotation direction.

12. The closing switching mechanism according to claim 11, characterized in that, The switching biasing component is a switching reset spring. The closing pull rod assembly is provided with a first spring mounting part, and the switching drive component is provided with a second spring mounting part. The two ends of the switching reset spring are respectively fixed to the first spring mounting part and the second spring mounting part. When not subjected to external force, the proximal end face of the switching drive component at least partially abuts against the closing pull rod assembly.

13. The closing switching mechanism according to claim 6, characterized in that, The switching drive includes an operating part, which is located on the first outer sleeve and protrudes from the outer surface of the housing of the anastomosis device body. The housing is provided with a receiving groove to accommodate the operating part.

14. 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.

15. The closing switching mechanism according to claim 1, characterized in that, The first moving direction and the second moving direction are along the axial direction of the stapler.

16. The closing switching mechanism according to claim 15, characterized in that, The first moving direction is toward the proximal side of the stapler, and the second moving direction is toward the distal side of the stapler.

17. A medical stapler, characterized in that, Includes the closing switching mechanism as described in any one of claims 1 to 16.

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