Closure switching mechanism and medical stapler

Abstract

This invention provides a closure switching mechanism and a medical stapler. The closure switching mechanism includes: a connecting rod extending axially along the stapler; a closure pull tab, at least partially located inside the connecting rod and movable axially relative to the connecting rod, with a first stop portion fixedly provided on the proximal side of the closure pull tab; and a reset button located on the proximal side of the connecting rod, at least partially inserted into the connecting rod and movable axially relative to the connecting rod. When the reset button is driven to move towards the distal side of the stapler, it drives the closure pull tab to move towards the distal side of the stapler. This invention allows manual opening of the staple head by operating the reset button, avoiding situations where the closure pull tab fails to retract properly, preventing the staple head from opening correctly.

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] In existing technology, a medical stapler includes a stapler body, an operating handle movably connected to the stapler body, and an anvil assembly that cooperates with the stapler body. The stapler body includes a firing assembly and a staple cartridge assembly located at the distal end. During the operation, two tissue segments to be anastomosed are placed between the anvil of the anvil assembly and the staple cartridge assembly. The distance between the anvil and the staple cartridge is adjusted to gradually clamp the tissue. Then, the operating handle drives the firing assembly to form the staples on the anvil, completing the anastomosis connection of the two tissue segments. The operator then holds the firing handle again, which pushes the staples towards the tissue. The staples in the staple cartridge assembly are formed at the anvil, anastomosing the tissue. Simultaneously, the cutter moves distally to cut the tissue, thus firing the stapler. Existing closure switching mechanisms are relatively complex, and after the stapler is fired, the staple head may be difficult to open, causing inconvenience to the operator.

[0003] 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. In the stapler, the inner and outer sides are relative to the axis of the stapler. The side closer to the axis is the inner side, and the side farther from the axis is the outer 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 allows the staple head to be manually opened by operating a reset button, thus avoiding the situation where the closure pull tab fails to retract properly, preventing the staple head from opening normally.

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

[0006] A connecting rod extends axially along the stapler;

[0007] A closing tab is located at least partially inside the connecting rod and is axially movable relative to the connecting rod. A first stop portion is fixedly provided on the proximal side of the closing tab.

[0008] A reset button is located on the proximal side of the connecting rod. The reset button is at least partially inserted into the interior of the connecting rod and can move axially relative to the connecting rod. When the reset button is driven to move toward the distal side of the stapler, it drives the closing pull tab to move toward the distal side of the stapler.

[0009] In some embodiments, the stapler includes a stapler body, and the closure switching mechanism further includes a second stop portion located on the proximal side of the first stop portion and axially fixed to the housing of the stapler body;

[0010] When the reset button is driven to move toward the distal end of the stapler, it abuts against the first stop portion; when the reset button is driven to move toward the proximal end of the stapler, it stops at the second stop portion.

[0011] In some embodiments, the stapler body is provided with a second stop portion mating portion, and the second stop portion is rotatably disposed on the second stop portion mating portion.

[0012] In some embodiments, the second stop portion is a circumferential groove provided in the housing, and the second stop portion is a first connecting pin movably provided in the reset button, wherein the first connecting pin is rotatably provided in the circumferential groove.

[0013] In some embodiments, an annular fastener is further included, the first connecting pin being fixedly connected to the fastener, and the fastener being rotatably disposed in the circumferential groove.

[0014] In some embodiments, the reset button is at least partially inserted into the interior of the fixing member, and the reset button is axially movable relative to the fixing member.

[0015] In some embodiments, the reset button includes a reset mating portion and an operating portion located on the proximal side of the reset mating portion. The operating portion is located on the proximal side of the second stop portion, which passes through the reset mating portion, and the reset mating portion is movable relative to the second stop portion along the axial direction of the stapler.

[0016] In some embodiments, the side of the reset mating part is provided with a sliding groove extending in the axial direction, the first connecting pin at least partially enters the sliding groove, and is movable along the extending direction of the sliding groove.

[0017] In some embodiments, the groove is not connected to the distal and proximal ends of the reset mating portion.

[0018] In some embodiments, a first biasing member is provided between the reset mating part and the first connecting pin, and the first biasing member provides the reset mating part with a biasing force toward the distal side of the stapler.

[0019] In some embodiments, the first biasing member is a first return spring, the interior of the reset mating part has a cavity, the interior of the cavity is provided with the first return spring, one end of the first return spring abuts against the distal end of the cavity, and the second end of the first return spring abuts against the first connecting pin.

[0020] In some embodiments, the first stop portion is a second connecting pin, the second connecting pin passes through the proximal end of the closing pull tab, and the reset engagement portion is located on the proximal end of the second connecting pin;

[0021] When the reset button is driven to move toward the distal end of the stapler, the distal surface of the reset mating part abuts against the second connecting pin, and drives the closing pull tab to move toward the distal end of the stapler.

[0022] In some embodiments, a closing pull rod assembly is further included, the closing pull rod assembly including a sleeve portion sleeved on the outside of the connecting rod and axially movable relative to the connecting rod, the sleeve portion being fixedly connected to the proximal side of the closing pull tab by the second connecting pin.

[0023] In some embodiments, a second biasing member is further provided between the sleeve portion and the second stop portion, the second biasing member providing the sleeve portion with a biasing force toward the distal side of the stapler.

[0024] In some embodiments, the closing lever assembly further includes a drive unit, and the closing switching mechanism further includes:

[0025] The linkage assembly includes a first pivot portion and a second pivot portion. The first pivot portion is pivotally connected to the anastomosis device body, and the second pivot portion is located on the proximal side of the first pivot portion. The second pivot portion is pivotally connected to the drive portion of the closure lever assembly. The linkage assembly includes a first state and a second state.

[0026] The firing handle includes the first mating part;

[0027] When the linkage assembly is in the first state and the firing handle rotates in the first direction, the first mating part drives the linkage assembly into the second state, the second pivot part of the linkage assembly moves towards the proximal side of the stapler, and drives the closing pull rod assembly to move towards the proximal side of the stapler.

[0028] 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;

[0029] 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.

[0030] In some embodiments, the linkage assembly further includes a drive button, and the closing switching mechanism further includes an actuating rod and a switching drive, the actuating rod being sleeved on the outside of the connecting rod, and the switching drive being disposed on the side of the actuating rod facing the linkage assembly;

[0031] When the switching drive moves toward the proximal side of the stapler and engages with the drive button, the switching drive presses the connecting rod assembly away from the connecting rod, and the third pivot and the fourth pivot move away from the connecting rod, causing the connecting rod assembly to enter the first state, and the second pivot drives the closing pull tab toward the distal side of the stapler through the closing pull rod assembly.

[0032] In some embodiments, the drive button is rotatably connected to the first rod or the second rod, the linkage assembly is in the second state, and when the actuating rod moves toward the distal end of the stapler, the switching drive unit drives the first end of the drive button to move toward the distal end without obstructing the movement of the actuating rod.

[0033] In some embodiments, it also includes:

[0034] The linkage assembly includes a first pivot portion and a second pivot portion. The first pivot portion is pivotally connected to the anastomosis device body, and the second pivot portion is located on the proximal side of the first pivot portion. The second pivot portion is pivotally connected to the drive portion of the closure lever assembly. The linkage assembly includes a first state and a second state.

[0035] When the switching drive moves toward the proximal side of the stapler, it drives the closure lever assembly to move toward the proximal side of the stapler, causing the connecting rod assembly to enter the second state from the first state; when the switching drive moves toward the distal side of the stapler, it drives the connecting rod assembly to enter the first state, and the second pivot drives the closure lever assembly to move toward the distal side of the stapler.

[0036] This invention also provides a medical stapler, including the aforementioned closure switching mechanism.

[0037] The closure switching mechanism and medical stapler provided by this invention have the following advantages:

[0038] This invention provides a closure switching mechanism for a medical stapler. When the stapler head is closed, the closure pull tab can be driven to retract to the distal side by operating the reset button to manually assist in opening the stapler head, thereby avoiding the situation where the closure pull tab does not retract in place, resulting in the stapler head not being able to open normally. Attached Figure Description

[0039] 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.

[0040] Figure 1 This is a schematic diagram of a stapler according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of a nail head according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the anastomosis device body after removing one side of the shell according to an embodiment of the present invention;

[0043] Figure 4 This is a top view of a closing switching mechanism according to an embodiment of the present invention;

[0044] Figure 5 yes Figure 4 Enlarged view of section A1-A1;

[0045] Figure 6 yes Figure 5 A diagram showing the firing handle omitted from the diagram;

[0046] Figure 7 This is a schematic diagram of the structure of a closing switching mechanism according to an embodiment of the present invention;

[0047] Figure 8 This is an exploded view of the closing switching mechanism of an embodiment of the present invention, omitting the firing handle;

[0048] Figure 9 This is a top view of the reset button and the fixing member in cooperation according to an embodiment of the present invention;

[0049] Figure 10 This is an exploded view of the reset button and the second stop part in accordance with an embodiment of the present invention.

[0050] Figure 11 This is a schematic diagram of the linkage assembly in a first state in accordance with an embodiment of the present invention, in cooperation with other components;

[0051] Figure 12 This is a schematic diagram of the linkage assembly in the second state in accordance with an embodiment of the present invention, in cooperation with other components;

[0052] Figure 13This is a cross-sectional view of a linkage assembly in a second state according to an embodiment of the present invention;

[0053] Figure 14 This is a schematic diagram of the state of the reset button after the nail head is closed according to an embodiment of the present invention;

[0054] Figure 15 This is a schematic diagram of the closing switching mechanism when the reset button is pressed to open the nail head according to an embodiment of the present invention;

[0055] Figure 16 This is a schematic diagram of the closing switching mechanism after the nail head is closed, according to another embodiment of the present invention.

[0056] Figure label:

[0057] 1. Anastomosing device body 44. Second pin

[0058] 11 Fixed handle 45 Third pin

[0059] 12 Closing tab 46 Drive button (Example 1)

[0060] 13 Housing 47 Elastic element

[0061] 131 Guide slot 48 Drive button (Example 2)

[0062] 132 Circumferential Groove 5 Closed Tie Rod Assembly

[0063] 14 Fasteners 51 Sleeve Part

[0064] 141 Pin Hole 511 Through Hole

[0065] 15 Handle return spring 512 Step surface

[0066] 16 Switching drive unit (Example 2) 52 Drive unit

[0067] 18 Connecting rod 521 Guide section

[0068] 19 First connecting pin 53 Second connecting pin

[0069] 2 Actuating rod 61 Second return spring

[0070] 21. Rack and pinion; 62. First return spring.

[0071] 3. Firing handle 63. Third return spring

[0072] 31 Claw 7 Reverse Lever

[0073] 32 First mating part 8 Reset button

[0074] 4. Linkage assembly 81. Operating unit

[0075] 41 First rod 82 Reset mating part

[0076] 411 Second mating part 821 Spring mounting hole

[0077] 412 First pivot part 822 Slide groove

[0078] 413 Third pivot part 823 Distal end face of the resetting mating part

[0079] 414 Mounting slot 9 nail head

[0080] 4141 Mounting slot first sidewall 91 Anvil

[0081] 4142 Second side wall of mounting groove 911 First mating groove

[0082] 42 Second rod 92 Spike cartridge assembly

[0083] 422 Second pivot joint 921 Second mating groove

[0084] 423 Fourth pivot part 93 Closing pin

[0085] 43 First Pin Detailed Implementation

[0086] 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.

[0087] This invention provides a closure switching structure for a medical stapler and a medical stapler including the closure switching mechanism. The stapler further includes a staple head and a stapler body, with the staple head disposed at the distal end of the stapler body. The closure switching mechanism is used to switch the closed state of the staple head. The closure switching mechanism includes a connecting rod, a closure pull tab, and a reset button. The connecting rod extends axially along the stapler. The closure pull tab is at least partially located inside the connecting rod and is axially movable relative to the connecting rod. A first stop portion is fixedly provided at the proximal end of the closure pull tab, and the distal end of the closure pull tab is connected to the staple head. When the closure pull tab moves towards the proximal end of the stapler, it controls the staple head to close; when the closure pull tab moves towards the distal end of the stapler, it controls the staple head to open.

[0088] The reset button is located on the proximal side of the connecting rod, and at least partially enters the interior of the connecting rod, and is axially movable relative to the connecting rod. Due to the dimensional tolerances of the stapler, there may be a situation where the closing tab does not retract properly after the stapler is opened. When it is necessary to manually open the staple head, operate the reset button to move towards the distal side of the stapler, driving the closing tab to move towards the distal side of the stapler to manually open the staple head, thereby avoiding the situation where the closing tab does not retract properly, resulting in the staple head not being able to open normally.

[0089] 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.

[0090] like Figures 1-15 The diagram shown is a structural schematic of a closure switching mechanism and a medical stapler including the same, according to an embodiment of the present invention. Figure 1 As shown, the stapler includes a staple head 9, a stapler body, and a closure switching mechanism. The closure switching mechanism is used to control the closing and opening of the staple head 9. The staple head 9 is located on the distal side of the stapler body 1. Figure 1 The image shows the state when the staple head 9 is open. The stapler body 1 includes a housing 13 and a fixed handle 11 disposed on one side. Figure 1 and Figure 2As shown, the staple head 9 includes an anvil 91 and a staple cartridge assembly 92 disposed opposite to each other. The anvil 91 has a third state of being open relative to the staple cartridge assembly 92 and a fourth state of being closed relative to the staple cartridge assembly 92. An inclined first mating groove 911 is provided on the proximal side of the anvil 91, and an axially extending second mating groove 921 is provided on the proximal side of the staple cartridge assembly 92. A closing pin 93 passes through both the first mating groove 911 and the second mating groove 921. The closing switching mechanism includes a closing tab 12 for closing the staple head 9, the distal end of which is connected to the closing pin 93. In the initial state, the closing pin 93 is located on the distal side of the second mating groove 921, and the anvil 91 is in the third state. When the closing tab 12 pulls the closing pin 93 from the distal side to the proximal side of the second mating groove 921, the anvil 91 enters the fourth state, at which point the anvil 91 and the staple cartridge assembly 92 clamp the tissue. The process by which the anvil 91 transitions from the third state to the fourth state is called the closing process of the staple head 9, which is also the closing process of the stapler. During the firing of the stapler, the staple head 9 needs to remain closed. After the stapler is fired, the staple head 9 can be opened when the closing pin 93 and the closing pull tab 12 move distally.

[0091] 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 represents the longitudinal direction, i.e., the height direction. (Definition) Figure 4 In this invention, the S3 direction is the transverse direction, i.e., the width direction. The inner and outer sides of the invention are relative to the axis of the stapler; the inner side is the side closer to the axis, and the outer side is the side farther from the axis.

[0092] like Figures 3-6As shown, the closure switching mechanism further includes a connecting rod 18 and a reset button 8. The connecting rod 18 extends axially along the stapler. The closure pull tab 12 is at least partially located inside the connecting rod 18 and is axially movable relative to the connecting rod 18. A first stop portion is provided on the proximal side of the closure pull tab 12. The reset button 8 is located on the proximal side of the connecting rod 18. The reset button 8 includes an operating part 81 and a reset mating part 82. The reset mating part 82 of the reset button 8 at least partially enters the interior of the connecting rod 18 and is axially movable relative to the connecting rod 18. The operating part 81 is connected to the proximal side of the reset mating part 82, and the proximal surface of the operating part 81 is a surface suitable for operator pressing. In the initial state, the reset mating part 82 abuts against the first stop portion. If the closure pull tab 12 moves towards the proximal side, the first stop portion can drive the reset mating part 82 to move towards the proximal side. Meanwhile, when it is necessary to manually open the staple head, the operating part 81 of the reset button 8 moves toward the distal end of the stapler, the reset mating part 82 abuts against the first stop part, and drives the closing pull tab 12 to move toward the distal end of the stapler, which can realize the manual opening of the staple head, thereby avoiding the situation where the closing pull tab 12 does not retract properly, causing the staple head to not open normally.

[0093] like Figures 3-6 As shown, the closure switching mechanism further includes a second stop portion. The second stop portion is located proximal to the first stop portion and is axially fixed to the housing 13 of the stapler body. When the reset button 8 is driven to move towards the proximal side of the stapler, it stops at the second stop portion. The stapler body 13 is provided with a second stop portion mating portion, and the second stop portion is rotatably disposed in the second stop portion mating portion. In this embodiment, the second stop portion is a first connecting pin 19. The second stop portion mating portion is a circumferential groove 132 provided on the inner surface of the housing 13, and the first connecting pin 19 is movably disposed in the circumferential groove 132, and the first connecting pin 19 can rotate in the circumferential groove 132. Here, the rotation of the first connecting pin 19 refers to the rotation of the first connecting pin 19 along its own axis.

[0094] like Figure 6As shown, the operating part 81 is located on the proximal side of the first connecting pin 19, and the first connecting pin 19 at least partially enters the reset mating part 82. Specifically, the side of the reset mating part 82 is provided with a sliding groove 822 extending axially. The first connecting pin 19 at least partially enters the sliding groove 822 and can move along the extending direction of the sliding groove 822. Through the cooperation between the first connecting pin 19 and the sliding groove 822, the reset mating part 82 is limited to axial movement relative to the first connecting pin 19, that is, the reset mating part 82 will not have lateral or longitudinal displacement relative to the first connecting pin 19, nor can it rotate relative to the first connecting pin 19. The sliding groove 822 is not connected to the distal and proximal ends of the reset mating part 82, thereby ensuring that the first connecting pin 19 will not separate from the reset mating part 82 at the distal and proximal ends of the sliding groove 822.

[0095] like Figures 3-6 In the illustrated embodiment, the closure switching mechanism further includes an annular fixing member 14, which is located on the proximal side of the connecting rod 18. The housing 13 of the stapler body 1 has a fixing member mounting hole adapted to the shape of the fixing member 14. The fixing member 14 is fixed in the fixing member mounting hole 132, achieving a fixed connection between the fixing member 14 and the housing 13 of the stapler body 1. The operating part 81 of the reset button 8 is located on the proximal side of the fixing member 14. The reset mating part 82 passes through the interior of the fixing member 14 and can move axially relative to the fixing member 14 along the stapler. The fixing member 14 further defines the longitudinal and lateral positions of the reset button 8, ensuring that the reset button 8 only moves axially relative to the housing 13 of the stapler body 1. In this embodiment, the outer diameter of the reset mating part 82 is smaller than the inner diameter of the fixing member 14, and the outer diameter of the operating part 81 is larger than the inner diameter of the fixing member 14, so that the operating part 81 can be held on the proximal side of the fixing member 14 without entering the interior of the fixing member 14.

[0096] like Figures 3-6As shown, in this embodiment, the first stop portion is the second connecting pin 53. The closing switching mechanism may further include a structure for driving the staple head to close. Specifically, the closing switching mechanism also includes a firing handle 3, a linkage assembly 4, and a closing pull rod assembly 5. The firing handle 3 is pivotally connected to the housing 13 of the stapler body 1. The firing handle 3 includes a first mating portion 32, and a handle return spring 15 is provided between the firing handle 3 and the stapler housing. When the firing handle 3 is gripped and rotated toward the fixed handle 11, the handle return spring 15 undergoes elastic deformation. The linkage assembly 4 includes a first rod 41 and a second rod 42. The second rod 42 is located on the proximal side of the first rod 41. The first rod 41 includes a first pivot portion 412, and the second rod 42 includes a second pivot portion 422. The linkage assembly 4 includes two relatively stable states: a first state corresponding to the staple head being open and a second state corresponding to the staple head being closed. The first pivot portion 412 is pivotally connected to the housing 13 of the stapler body 1 via a first pin 43, ensuring that the first pivot portion 412 does not move axially relative to the housing 13 of the stapler body 1. The second pivot portion 422 is located proximal to the first pivot portion 412, and is pivotally connected to the drive portion 52 of the closing lever assembly 5 via a third pin 45. The linkage assembly 4 is in the first state and the firing handle 3 is along the first direction (…). Figure 3 When rotating counterclockwise, the first mating part 32 drives the connecting rod assembly 4 into the second state. The second pivot part 422 of the connecting rod assembly 4 moves towards the proximal side of the stapler and drives the closing pull rod assembly 5 to move towards the proximal side of the stapler. The closing pull rod assembly 5 is fixedly connected to the proximal side of the closing pull tab 12 through the second connecting pin 53, thereby driving the closing pull tab 12 to move towards the proximal side and realizing the closure of the staple head.

[0097] The following is combined with Figures 3-15 The structure of the closing switching mechanism in this embodiment under different states is described in detail. Figures 3-11 The diagram shows the structure of the closing switching mechanism when the nail head is open, wherein the linkage assembly 4 is in the first state. Diagrams 12-14 show the structure of the closing switching mechanism when the nail head is closed, wherein the linkage assembly 4 is in the second state. Figure 15 The diagram illustrates the structure of the closing switching mechanism in this embodiment, where the nail head is in a closed state and the nail head is reopened by the closing switching mechanism, wherein the linkage assembly 4 returns to the first state.

[0098] like Figures 6-8As shown, in the initial state, the linkage assembly 4 is in a first state. The linkage assembly 4 is in a relatively compact state, with a small distance between the first pivot portion 412 and the second pivot portion 422. The closing pull rod assembly 5 includes a sleeve portion 51 and a drive portion 52. The sleeve portion 51 is sleeved on the outside of the connecting rod 18 and can move axially relative to the connecting rod 18. A through hole 511 is provided on the distal end of the sleeve portion 51, through which the second connecting pin 53 passes, thereby achieving a fixed connection between the distal end of the sleeve portion 511 and the proximal end of the closing pull tab 12. The drive portion 52 is located on the side of the sleeve portion 51 facing the linkage assembly 4, and one end of the drive portion 52 is pivotally connected to the second pivot portion 422 of the linkage assembly 4. A second biasing member is further provided between the sleeve portion 51 and the first connecting pin 19. This second biasing member provides a biasing force to the sleeve portion 51 towards the distal end of the stapler. Specifically, the second biasing member is a second return spring 61, which is disposed between the stepped surface 512 inside the sleeve portion 51 and the first connecting pin 19. The second return spring 61 can be, for example, a compression spring. Figure 2 and Figure 8 As shown, the drive unit 52 has at least one guide part 521 on its side, and the inner surface of the anastomosis device housing 13 has at least one guide groove 131. The guide groove 131 extends axially, and the guide part 521 at least partially enters the guide groove 131 and can move along the extension direction of the guide groove 131 to limit the drive unit 52 to only axial displacement.

[0099] The first rod 41 further includes a third pivot portion 413 and a second mating portion 411. The second rod 42 includes a second pivot portion 422 and a fourth pivot portion 423. The third pivot portion 413 is pivotally connected to the fourth pivot portion 423 via a second pin 44. The second mating portion 411 engages with the first mating portion 32 of the firing handle 3. In the initial state, the first mating portion 32 of the firing handle 3 abuts against the second mating portion 411, holding the linkage assembly 4 in a stable first state. When the linkage assembly 4 is in the first state, the third pivot portion 413 and the fourth pivot portion 423 are located at a position relatively far from the connecting rod 18.

[0100] like Figures 8-10 As shown, the side wall of the fastener 14 is provided with a pin hole 141, and the first connecting pin 19 passing through the fastener 14 is provided in the pin hole 141.

[0101] In this embodiment, a first biasing member is provided between the reset mating part 82 and the first connecting pin 19. The first biasing member provides the reset mating part 82 with a biasing force toward the distal end of the stapler. Specifically, as shown... Figure 6 and Figure 9 As shown, the first biasing element is a first return spring 62. The reset mating part 82 has a cavity inside, and the first return spring 62 is disposed inside the cavity. In a preferred embodiment, one end of the first return spring 62 abuts against the distal end of the cavity, and the second end of the first return spring 62 abuts against the first connecting pin 19 to keep the reset button in a stable state. The first return spring 62 can be, for example, a compression spring. A spring mounting hole 821 can be provided on the upper surface of the cavity for mounting the first return spring 62 inside the cavity of the reset mating part 82.

[0102] like Figure 6 , Figure 7 and Figure 11 As shown, when the linkage assembly 4 is in the first state, the distance between the first pivot portion 412 and the second pivot portion 422 of the linkage assembly 4 is L1, and the included angle between the first rod 41 and the second rod 42 is α1. The firing handle 3 is along the first direction ( Figure 7 When the first engagement part 32 of the firing handle 3 engages with the second engagement part 411 of the first rod 41 (counterclockwise), it drives the first rod 41 to rotate around the first pin 43 in the S4 direction (...). Figure 11 The second rod 42 rotates counterclockwise around the second pin 44 in the S5 direction. Figure 11 Rotating clockwise, the distance between the second pivot 422 and the first pivot 412 gradually increases, the angle between the first rod 41 and the second rod 42 gradually increases, and the third pivot 413 and the fourth pivot 423 move closer to the connecting rod 18, allowing the connecting rod assembly 4 to enter the... Figure 12 The second state is shown. Compare. Figure 11 and Figure 12As can be seen, after the linkage assembly 4 is in the second state, the distance between the second pivot 422 and the first pivot 412 increases from L1 to L2, and the included angle between the first rod 41 and the second rod 42 also increases to an angle of approximately 180°. Since the first pivot 412 has no axial displacement relative to the housing 13 of the anastomosis device body 1, the second pivot 422 in the second state moves towards the proximal end compared to the second pivot 422 in the first state, driving the closing pull rod assembly 5 to move towards the proximal end. At this time, the linkage assembly 4 is held in a relatively stable second state. Even if the firing handle 3 is released at this time, the firing handle 3 returns to its initial position under the action of the handle return spring 15, and the state of the linkage assembly 4 will not change.

[0103] like Figures 12-14 As shown, when the connecting rod assembly 4 enters the second state from the first state, the closing pull rod assembly 5 moves towards the proximal side, and the closing pull rod assembly 5 drives the closing pull tab 12 to move towards the proximal side through the second connecting pin 53, thereby closing the staple head. Simultaneously, the second connecting pin 53 abuts against the distal end face 823 of the reset mating part 82 and drives the reset mating part 82 to move towards the proximal side. The reset button 8 moves towards the proximal side as a whole, until there is an axial distance between the distal end of the operating part 81 and the proximal end of the fixing member 14. The operating part 81 protrudes beyond the proximal side of the anastomosis device housing 13. At this time, the reset mating part 82 of the reset button 8 compresses and deforms the first reset spring 62, and the sleeve part 51 of the closing pull rod assembly 5 compresses and deforms the second reset spring 61.

[0104] In this embodiment, the closure switching mechanism may further include an automatic nail head opening structure after the nail head is closed. Specifically, the linkage assembly 4 further includes a drive button 46, and the closure switching mechanism further includes a switching drive element. In this embodiment, the closure switching mechanism further includes an actuating rod 2 sleeved on the outside of the connecting rod 18. The actuating rod 2 has a rack 21 on the side facing the linkage assembly 4. The rack 21 serves as both the drive element for triggering the stapler and the switching drive element. The rack 21 includes a first position region and a second position region, with the first position region located proximal to the second position region. Initially, the rack 21 is in the first position region. Figure 5 As shown, the firing handle 3 also includes a pawl 31 that engages with the rack 21. After the nail head is closed, by gripping the firing handle 3 again, the pawl 31 can drive the rack 21 in a distal direction, causing the rack 21 to move the actuator rod 2 in a distal direction to fire the stapler.

[0105] The drive button 46 is rotatably connected to either the first lever 41 or the second lever 42. Specifically, as shown... Figure 12 and Figure 13 As shown, in this embodiment, the first rod 41 has a mounting groove 414 inside, and the first end of the drive button 46 enters the mounting groove 414 and can rotate around the first end in the mounting groove 414. When the second end of the drive button 46 does not receive external force, the second end of the drive button 46 protrudes from the side surface of the first rod 41 facing the connecting rod 18, and the drive button 46 is close to the second sidewall 4142 of the mounting groove 414. Figure 12 In the controlled state, when the firing handle 3 is held and the rack 21 is moved from the first position region to the second position region, the rack 21 contacts the second end of the drive button 46 and presses it downward, causing the drive button 46 to rotate. This causes the drive button 46 to approach the first sidewall 4141 of the mounting groove 414, while simultaneously deforming the elastic element 47 on one side. The drive button 46 then further enters the interior of the mounting groove 414. Figure 13 The pin head remains in its second state without obstructing the movement of the rack 21. Simultaneously, the connecting rod assembly 4 also remains in its second state, maintaining the stability of the pin head.

[0106] After the stapler is fired, the actuator 2 is moved proximally by operating the retractor 7. As the actuator 2 moves from the second position region to the first position region, the rack 21 presses the drive button 46 away from the actuator 2. This causes the drive button 46 to drive the third pivot 413 and the fourth pivot 423 to move away from the connecting rod 18, causing the connecting rod assembly 4 to re-enter the first state. During this process, the second pivot 422 drives the closing pull rod assembly 5 to move distally, and the closing pull tab 12 is driven to move distally to automatically open the staple head.

[0107] However, in practical applications, due to dimensional tolerances in the mechanical structure or other factors, the automatic nail head opening mechanism may fail. This could result in the linkage assembly 4 returning to the open state after firing, but the closing tab not returning to its designated position, causing the nail head to fail to open properly, or the opening angle of the nail head to be limited and unable to open fully. In this case, the nail head can be manually opened by operating the reset button 8. Specifically, as... Figure 12 and Figure 14As shown, when the linkage assembly 4 is in the second state, the distal end of the operating portion 81 of the reset button 8 is a certain distance from the proximal end of the fixing member 14. Simultaneously, the operating portion 81 of the reset button 8 protrudes from the surface of the housing 13 for easy operation. The operator can move towards the distal side (i.e., along...). Figure 14 Press the reset button 8 in the S6 direction to move the reset button 8 to the distal side until it moves to the position shown in the image. Figure 15 The position shown. During this process, under the driving action of the operating part 81, the reset mating part 82 drives the second connecting pin 53 in the distal direction, causing the closing pull tab 12 to move in the distal direction and open the nail head. At the same time, the second connecting pin 53 drives the sleeve part 51 of the closing pull rod assembly 5 to move in the distal direction. The driving part 52 of the closing pull rod assembly 5 drives the second pivot part 422 to move in the distal direction, causing the third pivot part 413 and the fourth pivot part 423 to move away from the connecting rod 18 to the position shown. Figure 15 As shown, the linkage assembly 4 returns to the first state, and the first return spring 62 and the second return spring 61 also return to their initial states. Therefore, with the staple head of the stapler closed, the staple head can be manually opened by operating the reset button 8 to drive the closing pull tab 12 to retract to the distal side, thus avoiding the situation where the closing pull tab 12 does not retract properly, causing the staple head to fail to open normally.

[0108] like Figure 16 The diagram shown is a structural schematic of a closing switching mechanism according to another embodiment of the present invention. This embodiment is similar to... Figures 1-15The difference in the illustrated embodiment is that the closure switching mechanism includes a structure for manually closing and manually opening the staple head. Specifically, the closure switching mechanism further includes a switching drive 16, one end of which protrudes beyond the housing of the stapler body for easy hand operation by the operator. A drive button 48 is provided on the third pivot portion 413 of the first rod 41, and the drive button 48 is non-rotatable relative to the first rod 41. The switching drive 16 is sleeved on the outside of the connecting rod 18, and a third return spring 63 is provided between the switching drive 16 and the housing of the stapler body 1. The third return spring 63 may be, for example, a compression spring. The switching drive 16 includes a third position region and a fourth position region, with the third position region located at the distal end of the fourth position region. Initially, the switching drive 16 is in the third position region. By operating the switching drive 16 to move it from the third position region toward the proximal side of the stapler to the fourth position region, the closure pull rod assembly 5 is driven to move proximally, closing the staple head 9. Simultaneously, the closing lever assembly 5 drives the second pivot portion 422 to move proximally via the drive portion 52, and the third pivot portion 413 and the fourth pivot portion 423 of the connecting rod assembly 4 move towards the connecting rod 18, causing the connecting rod assembly 4 to transition from the first state to the second state. During the anastomosis device firing process, the switching drive member 16 is located proximally to the drive button 48 and does not act on the connecting rod assembly 4, which remains in the second state. After the stapler is fired, when the switching drive 16 moves from the fourth position area toward the distal end of the stapler to the third position area, the third return spring 63 is compressed. The switching drive 16 presses the drive button 46 of the linkage assembly 4 away from the connecting rod 18, causing the third pivot 413 and the fourth pivot 423 to move away from the connecting rod 18. The linkage assembly 4 returns to the first state, and the closing pull rod assembly 5 moves toward the distal end, driving the closing pull tab 12 to move toward the distal end to open the staple head 9.

[0109] exist Figure 16 In this embodiment, if the switching drive 16 fails or the switching drive 16 cannot fully open the nail head, it can also be done by moving along... Figure 16Pressing the operating part 81 of the reset button 8 in the S6 direction causes the operating part 81 to drive the reset mating part 82 to move in the distal direction, causing the closing pull tab 12 to move in the distal direction and open the nail head. At the same time, the second connecting pin 53 drives the sleeve part 51 of the closing pull rod assembly 5 to move in the distal direction. The driving part 52 of the closing pull rod assembly 5 drives the second pivot part 422 to move in the distal direction, causing the third pivot part 413 and the fourth pivot part 423 to move away from the connecting rod 18, and the connecting rod assembly 4 returns to the first state.

[0110] exist Figures 1-15 The closing switching mechanism includes a structure that drives the nail head to close via a firing handle, a structure that automatically opens the nail head, and a structure that manually resets the nail head by operating a reset button when the automatic opening structure fails. Figure 16 In one embodiment, the closing switching mechanism includes a mechanism for manually closing and opening the pin head, and a structure for manually resetting the switch drive 6 when it fails. In another alternative embodiment, the reset button reset structure in the closing switching mechanism can cooperate with other pin head opening structures, and is not limited to... Figures 1-15 The structure of the rack and drive button shown in the figure and Figure 16 The diagram shows the structure of the switching drive and the drive button. In another alternative embodiment, the automatic / manual opening structure of the staple head may be omitted, and only a structure for closing the staple head via a firing handle and a reset button structure may be provided. That is, after the staple head is closed by the firing handle, the stapler is fired by the firing handle, and then the staple head is opened directly by operating the reset button. This also falls within the scope of protection of this invention. In yet another alternative embodiment, other structures for driving the staple head to close may be provided and combined with the reset button structure.

[0111] 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: A connecting rod extends axially along the stapler; A closing tab is located at least partially inside the connecting rod and is axially movable relative to the connecting rod. A first stop portion is fixedly provided on the proximal side of the closing tab. A reset button is located on the proximal side of the connecting rod, the reset button is at least partially inserted into the interior of the connecting rod, and is axially movable relative to the connecting rod; When the closing pull tab is driven to move proximally, the first stop portion abuts against the reset button and drives the reset button to move proximally. When the reset button is driven to move distally towards the stapler, it abuts against the first stop portion, and the closing pull tab is driven to move distally towards the stapler through the first stop portion.

2. The closed switching mechanism according to claim 1, characterized in that, The stapler includes a stapler body, and the closure switching mechanism further includes a second stop portion. The second stop portion is located on the proximal side of the first stop portion and is axially fixed to the housing of the stapler body. When the reset button is driven to move towards the proximal side of the stapler, it stops at the second stop portion.

3. The closing switching mechanism according to claim 2, characterized in that, The stapler body is provided with a second stop part mating part, and the second stop part is rotatably disposed on the second stop part mating part.

4. The closing switching mechanism according to claim 3, characterized in that, The second stop part is a circumferential groove provided in the housing, and the second stop part is a first connecting pin movably provided in the reset button. The first connecting pin is rotatably provided in the circumferential groove.

5. The closing switching mechanism according to claim 4, characterized in that, It also includes an annular fastener, to which the first connecting pin is fixedly connected, and the fastener is rotatably disposed in the circumferential groove.

6. The closing switching mechanism according to claim 5, characterized in that, The reset button is at least partially inserted into the interior of the fixing member, and the reset button is axially movable relative to the fixing member.

7. The closing switching mechanism according to claim 4, characterized in that, The reset button includes a reset engagement portion and an operating portion located on the proximal side of the reset engagement portion. The operating portion is located on the proximal side of the second stop portion, which passes through the reset engagement portion. The reset engagement portion is movable relative to the second stop portion along the axial direction of the stapler.

8. The closing switching mechanism according to claim 7, characterized in that, The side of the reset mating part is provided with a sliding groove extending in the axial direction, and the first connecting pin at least partially enters the sliding groove and can move along the extending direction of the sliding groove.

9. The closing switching mechanism according to claim 8, characterized in that, The groove is not connected to the distal and proximal ends of the reset mating part.

10. The closing switching mechanism according to claim 7, characterized in that, A first biasing member is provided between the reset mating part and the first connecting pin, and the first biasing member provides the reset mating part with a biasing force toward the distal side of the stapler.

11. The closing switching mechanism according to claim 10, characterized in that, The first biasing member is a first return spring. The interior of the reset mating part has a cavity, and the first return spring is disposed inside the cavity. One end of the first return spring abuts against the far end of the cavity, and the second end of the first return spring abuts against the first connecting pin.

12. The closing switching mechanism according to claim 7, characterized in that, The first stop portion is a second connecting pin, which passes through the proximal end of the closing pull tab, and the reset mating portion is located on the proximal end of the second connecting pin; When the reset button is driven to move toward the distal end of the stapler, the distal surface of the reset mating part abuts against the second connecting pin, and drives the closing pull tab to move toward the distal end of the stapler.

13. The closing switching mechanism according to claim 12, characterized in that, It also includes a closing pull rod assembly, which includes a sleeve portion that is sleeved on the outside of the connecting rod and is axially movable relative to the connecting rod. The sleeve portion is fixedly connected to the proximal side of the closing pull tab by the second connecting pin.

14. The closing switching mechanism according to claim 13, characterized in that, A second biasing member is also provided between the sleeve portion and the second stop portion, and the second biasing member provides the sleeve portion with a biasing force toward the distal side of the stapler.

15. The closing switching mechanism according to claim 13, characterized in that, The closing lever assembly further includes a drive unit, and the closing switching mechanism further includes: The linkage assembly includes a first pivot portion and a second pivot portion. The first pivot portion is pivotally connected to the anastomosis device body, and the second pivot portion is located on the proximal side of the first pivot portion. The second pivot portion is pivotally connected to the drive portion of the closure lever assembly. The linkage assembly includes a first state and a second state. The firing handle includes the first mating part; When the linkage assembly is in the first state and the firing handle rotates in the first direction, the first mating part drives the linkage assembly into the second state, the second pivot part of the linkage assembly moves towards the proximal side of the stapler, and drives the closing pull rod assembly to move towards the proximal side of the stapler.

16. The closing switching mechanism according to claim 15, 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.

17. The closing switching mechanism according to claim 16, characterized in that, The linkage assembly further includes a drive button, and the closing switching mechanism further includes an actuating rod and a switching drive element. The actuating rod is sleeved on the outside of the connecting rod, and the switching drive element is disposed on the side of the actuating rod facing the linkage assembly. When the switching drive moves toward the proximal side of the stapler and engages with the drive button, the switching drive presses the connecting rod assembly away from the connecting rod, and the third pivot and the fourth pivot move away from the connecting rod, causing the connecting rod assembly to enter the first state, and the second pivot drives the closing pull tab toward the distal side of the stapler through the closing pull rod assembly.

18. The closing switching mechanism according to claim 17, characterized in that, The drive button is rotatably connected to the first rod or the second rod. When the linkage assembly is in the second state and the actuating rod moves toward the distal end of the stapler, the switching drive drives the first end of the drive button to move toward the distal end without obstructing the movement of the actuating rod.

19. The closing switching mechanism according to claim 13, characterized in that, Also includes: The linkage assembly includes a first pivot portion and a second pivot portion. The first pivot portion is pivotally connected to the anastomosis device body, and the second pivot portion is located on the proximal side of the first pivot portion. The second pivot portion is pivotally connected to the drive portion of the closure lever assembly. The linkage assembly includes a first state and a second state. When the switching drive moves toward the proximal side of the stapler, it drives the closure lever assembly to move toward the proximal side of the stapler, causing the connecting rod assembly to enter the second state from the first state; when the switching drive moves toward the distal side of the stapler, it drives the connecting rod assembly to enter the first state, and the second pivot drives the closure lever assembly to move toward the distal side of the stapler.

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

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