Closure drive mechanism and medical stapler

Abstract

The application provides a closure driving mechanism and a medical anastomat. The anastomat comprises an anastomat body. The closure driving mechanism comprises: a link assembly comprising a first pivot joint and a second pivot joint, the first pivot joint being pivotally connected to the anastomat body, the second pivot joint being located on the proximal side of the first pivot joint, the link assembly having a first state and a second state; a firing handle comprising a first matching part; a closure pull rod assembly being pivotally connected to the second pivot joint of the link assembly; wherein when the link assembly is in the first state and the firing handle is rotated in a first direction, the first matching part drives the link assembly into the second state, the second pivot joint of the link assembly moves towards the proximal side of the anastomat, and the closure pull rod assembly is driven to move towards the proximal side of the anastomat. The structure of the application is simple, and the closure of the staple head of the anastomat can be effectively controlled.

Description

Technical Field

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

[0002] The medical stapler includes a medical stapler body, a firing handle movably connected to the medical stapler body, and a staple head that cooperates with the body. The staple head includes a stapler assembly and an anvil that are arranged opposite to each other. During surgery, the firing handle is first grasped, and the closing pull tab is pulled toward the proximal side of the stapler through the closing drive mechanism to close the stapler assembly and the anvil. Then, the firing handle is grasped again to push the staples toward the tissue. The staples in the stapler assembly are formed at the anvil to staple the tissue, and the cutter moves toward the distal side to cut the tissue. In the present invention, the distal side and the proximal side are relative to the operator. The end closer to the operator is the proximal side, and the end farther from the operator, that is, the end closer to the surgical site is the distal side.

[0003] The existing closing drive mechanism has a relatively complex structure, and the complex structure may also lead to instability in the closing control. During the firing process of the stapler, the closing pull tab may be displaced toward the distal side of the stapler, affecting the closing effect between the staple magazine assembly and the anvil, and having an adverse effect on the surgical effect. Summary of the Invention

[0004] In view of the problems in the prior art, the object of the present invention is to provide a closing drive mechanism and a medical stapler, which have a simple structure and can effectively control the closing of the stapler's nail head.

[0005] An embodiment of the present invention provides a closing drive mechanism for a medical stapler, wherein the stapler includes a stapler body, and the closing drive mechanism includes:

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

[0007] A firing handle comprising a first mating portion;

[0008] a closing pull rod assembly pivotally connected to the second pivotal portion of the connecting rod assembly;

[0009] In which, when the connecting rod assembly is in the first state and the firing handle rotates along the first direction, the first mating portion drives the connecting rod assembly to enter the second state, the second pivotal portion of the connecting rod assembly moves toward the proximal side of the anastomosis device, and drives the closing pull rod assembly to move toward the proximal side of the anastomosis device.

[0010] In some embodiments, the connecting rod assembly includes a first rod and a second rod, the second rod is located on the proximal side of the first rod, the first rod includes the first pivot portion and a third pivot portion, the second rod includes the second pivot portion and a fourth pivot portion, and the third pivot portion is pivotally connected to the fourth pivot portion.

[0011] In some embodiments, the first rod further includes a second mating portion. When the connecting rod assembly is in the first state and the firing handle rotates along the first direction, the first mating portion drives the first rod to rotate along the first direction through the second mating portion, and the second rod rotates along a second direction relative to the first rod. The second direction is opposite to the first direction, and the angle between the first rod and the second rod increases.

[0012] In some embodiments, the anastomosis device body includes a connecting rod, and the closing pull rod assembly is sleeved on the outside of the connecting rod. When the connecting rod assembly enters the second state from the first state, the third pivotal portion and the fourth pivotal portion move toward the direction close to the connecting rod, driving the closing pull rod assembly to move toward the proximal side of the connecting rod.

[0013] In some embodiments, the anastomosis device body also includes a closing pull tab located inside the connecting rod, and the closing pull rod assembly includes a sleeve portion and a driving portion that are connected to each other. The sleeve portion is sleeved on the outside of the connecting rod and connected to the proximal side of the closing pull tab, and the driving portion is pivotally connected to the second pivot portion.

[0014] In some embodiments, the stapler body further comprises a shell, an inner side surface of the shell is provided with a guide groove extending in the axial direction, the driving portion of the closing rod assembly is provided with a guide portion, the guide portion at least partially enters the guide groove and is movable along the extension direction of the guide groove; or,

[0015] The inner side surface of the housing is provided with a guide portion, and the driving portion of the closing pull rod assembly is provided with a guide groove extending in the axial direction. The guide portion at least partially enters the guide groove and can move along the extension direction of the guide groove.

[0016] In some embodiments, the closing pull rod assembly further includes a connecting pin, a through hole is provided on the distal side of the sleeve portion, and the connecting pin passes through the through hole on the distal side of the sleeve portion and the proximal side of the closing pull tab to fixedly connect the sleeve portion and the closing pull tab.

[0017] In some embodiments, a stop block is further provided on the proximal side of the connecting rod, and a closing return spring is provided between the sleeve portion and the stop block. When the connecting rod assembly enters the second state from the first state, the closing return spring is compressed toward the proximal end by the sleeve portion.

[0018] In some embodiments, the third pivot portion includes a groove, and the fourth pivot portion at least partially enters the groove of the third pivot portion; or, the fourth pivot portion includes a groove, and the third pivot portion at least partially enters the groove of the fourth pivot portion.

[0019] In some embodiments, the third pivot portion includes a groove, the fourth pivot portion at least partially enters the groove of the third pivot portion, and the fourth pivot portion is provided with a protrusion, and when the connecting rod assembly is in the second state, the protrusion abuts against the outer wall of the groove to prevent the second rod from continuing to rotate relative to the first rod in the second direction; or

[0020] The fourth pivot portion includes a groove, the third pivot portion at least partially enters the groove of the fourth pivot portion, and the third pivot portion is provided with a protrusion. When the connecting rod assembly is in the second state, the protrusion abuts against the outer wall of the groove, preventing the second rod from continuing to rotate in the second direction relative to the first rod.

[0021] In some embodiments, when the connecting rod assembly is in the first state and the firing handle is in the initial position, the second matching portion abuts against the first matching portion of the firing handle.

[0022] In some embodiments, the first rod is a triangular rod, the first pivoting portion and the third pivoting portion are respectively provided at the first angular position and the second angular position of the triangular rod, and the second matching portion is provided at the third angular position of the triangular rod.

[0023] In some embodiments, an outer surface of the second matching portion is an arc-shaped surface.

[0024] In some embodiments, the second rod is a straight rod, and the first end and the second end of the second rod are respectively provided with the second pivoting portion and the fourth pivoting portion.

[0025] In some embodiments, the stapler body includes a shell, the connecting rod assembly is located inside the shell, and the first pivot portion is pivotally connected to the inner side of the shell.

[0026] An embodiment of the present invention further provides a medical stapler, comprising the above-mentioned closing drive mechanism.

[0027] The closed drive mechanism and medical stapler provided by the present invention have the following advantages:

[0028] The present invention provides a closing drive mechanism for a stapler, which directly realizes transmission between a firing handle and a closing pull rod assembly through a connecting rod assembly. When the nail head needs to be closed, the firing handle is held, and the firing handle can drive the closing drive mechanism to move toward the proximal side through the connecting rod assembly, and then pull the closing pull tab to move toward the proximal side to close the nail head. The structure is simple and effectively realizes the closing control of the nail head. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0030] Figure 1 1 is a schematic structural diagram of a stapler according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic structural diagram of the cooperation between the nail head and the pull tab according to one embodiment of the present invention;

[0032] Figure 3 1 is a schematic structural diagram of an anvil according to an embodiment of the present invention;

[0033] Figure 4 This is a structural diagram of a stapler body according to an embodiment of the present invention, with one side of the shell removed;

[0034] Figure 5 is a structural schematic diagram of a closing drive mechanism according to an embodiment of the present invention;

[0035] Figure 6 is a schematic structural diagram of a closed drive mechanism according to an embodiment of the present invention, wherein the firing handle is omitted, wherein the connecting rod assembly is in a first state;

[0036] Figure 7 is a structural schematic diagram of a connecting rod assembly in a first state according to an embodiment of the present invention;

[0037] Figure 8 is a schematic diagram of the cooperation between the first rod and the second rod according to an embodiment of the present invention;

[0038] Figure 9 is a structural schematic diagram of a closing pull rod assembly according to an embodiment of the present invention;

[0039] Figure 10 This is a schematic structural diagram of the cooperation between the closing rod assembly and the housing according to one embodiment of the present invention;

[0040] Figure 11is a schematic structural diagram of a closed drive mechanism according to an embodiment of the present invention, wherein the firing handle is omitted, wherein the connecting rod assembly is in the second state;

[0041] Figure 12 3 is a schematic structural diagram of a connecting rod assembly in a second state according to an embodiment of the present invention.

[0042] Reference numerals:

[0043] 1. Second pivoting portion of the stapler body 422

[0044] 11 Fixed handle 423 Fourth pivot portion

[0045] 12 Closing pull tab 43 First pin

[0046] 13 Housing 44 Second pin

[0047] 131 guide groove 45 third pin

[0048] 14 Stop block 5 Closing rod assembly

[0049] 15 Handle return spring 51 sleeve

[0050] 18 Connecting rod 511 through hole

[0051] 2 Actuating rod 52 driving part

[0052] 21 rack 521 guide portion

[0053] 3. Matching hole for firing handle 522

[0054] 31 claw 53 connecting pin

[0055] 32 First matching portion 6 Closed return spring

[0056] 4 Connecting rod assembly 9 Nail head

[0057] 41 First Bar 91 Anvil

[0058] 411 second matching portion 911 first matching groove

[0059] 412 first pivot portion 92 staple cartridge assembly

[0060] 413 third pivoting portion 921 second matching groove

[0061] 42 Second rod 93 Closing pin

[0062] 421 raised part DETAILED DESCRIPTION

[0063] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the drawings represent identical or similar structures, and thus repeated description thereof will be omitted.

[0064] The present invention provides a closing drive mechanism for a medical stapler and a stapler including the closing drive mechanism. The stapler also includes a stapler head and a stapler body, wherein the stapler head is disposed on the distal end of the stapler body, and a closing pull tab for closing the stapler head is disposed in the stapler body, wherein the distal end of the closing pull tab is connected to the stapler head. The closing drive mechanism includes: a connecting rod assembly including a first pivot portion and a second pivot portion, wherein the first pivot portion is pivotally connected to the stapler body, and the second pivot portion is located on the proximal end of the first pivot portion, and the connecting rod assembly has a first state and a second state; a firing handle including a first mating portion; and a closing pull rod assembly pivotally connected to the second pivot portion of the connecting rod assembly; wherein, when the connecting rod assembly is in the first state and the firing handle is rotated in a first direction, the first mating portion drives the connecting rod assembly to enter the second state, the second pivot portion of the connecting rod assembly moves toward the proximal end of the stapler, and drives the closing pull rod assembly to move toward the proximal end of the stapler. The closing rod assembly is connected to the closing pull tab. When the closing rod assembly moves toward the proximal side, the closing pull tab is driven to move toward the proximal side, thereby achieving closure of the nail head.

[0065] Therefore, the present invention directly realizes the transmission between the firing handle and the closing pull rod assembly through the connecting rod assembly. When the nail head needs to be closed, the firing handle is held, and the firing handle can drive the closing drive mechanism to move toward the proximal side through the connecting rod assembly, and then pull the closing pull tab to move toward the proximal side to close the nail head. The structure is simple and effectively realizes the closing control of the nail head.

[0066] The structures of the closing drive mechanisms 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.

[0067] like Figures 1 to 12 As shown, one embodiment of the present invention provides a closing drive mechanism for a medical stapler and a stapler including the closing drive mechanism. Figure 1 As shown, the stapler includes a stapler head 9, a stapler body 1 and the closing drive mechanism. The stapler head 9 is arranged at the distal end of the stapler body 1. Figure 2 and Figure 3As shown, the stapler head 9 includes an anvil 91 and a staple cartridge assembly 92 disposed opposite each other. The anvil 91 has a third state (open relative to the staple cartridge assembly 92) and a fourth state (closed relative to the staple cartridge assembly 92). A first, inclined mating slot 911 is provided on the proximal end of the anvil 91, while a second mating slot 921 is provided on the proximal end of the stapler assembly 92. The second mating slot 921 extends axially along the stapler. A closing pin 93 is inserted through both the first and second mating slots 911 and 921. When the closing pin 93 is located distally of the second mating slot 921, the anvil 91 is in the third state. When the closing pin 93 moves from the distal end to the proximal end of the second mating slot 921, the anvil 91 enters the fourth state. When the anvil 91 is in the fourth state, the anvil 91 and the staple cartridge assembly 92 clamp tissue. The process of the anvil 91 entering the fourth state from the third state is called the closing process of the stapler head 9, that is, the closing process of the stapler. The stapler body 1 is provided with a closing tab 12 for closing the stapler head 9. The distal end of the closing tab 12 is connected to the closing pin 93. When the closing tab 12 moves toward the proximal end, it can pull the closing pin 93 toward the proximal end, thereby closing the stapler head 9.

[0068] In the present invention, the distal side and the proximal side are relative to the operator, the end closer to the operator is the proximal side, the end farther from the operator, that is, the end closer to the surgical site is the distal side, and the direction along the axis of the stapler is the axial direction, that is, the direction from the distal side to the proximal side of the stapler, or from the proximal side to the distal side of the stapler. For example, in Figure 1 From the perspective of FIG, for the stapler, the distal side is the left side and the proximal side is the right side. Figure 1 The S1 direction is the direction from the distal end to the proximal end of the stapler. The S1 direction or the direction opposite to the S1 direction is defined as the axial direction of the stapler. Figure 5 The S2 direction is the longitudinal direction, that is, the height direction.

[0069] like Figure 4 As shown, the stapler body 1 also includes a housing 13, a fixed handle 11, a connecting rod 18 extending axially, and an actuating rod 2 sleeved on the connecting rod 18. The closing pull tab 12 is arranged inside the connecting rod 18, and the closing pull tab 12 can move axially relative to the connecting rod 18. The connecting rod 18 is a hollow tubular rod, and its distal end is connected to the nail head. A rack 21 is provided on one side of the actuating rod 2. The closing drive mechanism includes a connecting rod assembly 4, a firing handle 3 and a closing pull rod assembly 5. The firing handle 3 is movably connected to the stapler body 1 and can move relative to the fixed handle 11. Figure 4 The initial position of the firing handle 3 is shown in the figure. When the firing handle 3 is held, the firing handle 3 moves toward the fixed handle 11 along the S3 direction. In the initial state, the firing handle 3 is located at the initial position away from the fixed handle 11. After the nail head reaches the surgical site, the closing drive mechanism is driven by holding the firing handle 3, thereby closing the nail head to clamp the tissue. A claw 31 is provided at one end of the firing handle 3 entering the stapler body 1, and the claw 31 can cooperate with the rack 21. After the nail head is closed, the firing handle 3 is held again, and the firing handle 3 moves toward the fixed handle 11, and drives the rack 21 through the claw 31 to drive the actuating rod 2 to move toward the distal side. The actuating rod 2 drives the knife push rod, which drives the cutter and firing block in the nail head through the knife push rod, thereby firing the stapler. The stapler body 1 is also provided with a handle return spring 15. When the firing handle 3 is gripped, the handle return spring 15 is compressed and elastically deformed. When the firing handle 3 is released, the firing handle 3 moves away from the fixed handle 11 under the deformation recovery force of the handle return spring 15, and then returns to its initial position.

[0070] like Figures 5 to 8 As shown, the connecting rod assembly 4 includes a first pivoting portion 412, a second pivoting portion 422, and a second mating portion 411. The first pivoting portion 412 is pivotally connected to the housing 13 of the stapler body 1, that is, the first pivoting portion 412 only has rotational movement relative to the stapler body 1, and does not have axial movement. In the axial direction, the first pivoting portion 412 is in a relatively fixed position. The second pivoting portion 422 is located on the proximal side of the first pivoting portion 412. The connecting rod assembly 4 has a first state and a second state. When the connecting rod assembly 4 is in the first state, the second pivoting portion 422 is in the first position area. When the connecting rod assembly 4 is in the second state, the second pivoting portion 422 is in the second position area, and the second position area is on the proximal side of the first position area. That is, when the connecting rod assembly 4 moves from the first state to the second state, the second pivoting portion 422 moves toward the proximal side of the stapler, from the first position area to the second position area. The firing handle 3 further includes a first mating portion 32 , which is a protruding structure provided on a side of the firing handle 3 facing the connecting rod assembly 4 . The closing pull rod assembly 5 is pivotally connected to the second pivoting portion 422 of the connecting rod assembly 4 .

[0071] In the initial state, the connecting rod assembly 4 is in the first state, and the firing handle 3 is in Figure 5 The connecting rod assembly 4 is in the first state and the firing handle 3 is in the first direction ( Figure 6In the S3 direction, Figure 6 When the first engaging portion 32 is rotated in the counterclockwise direction (from a perspective of FIG), the first engaging portion 32 drives the connecting rod assembly 4 into the second state via the second engaging portion 411. The second pivoting portion 422 of the connecting rod assembly 4 moves toward the proximal side of the stapler and drives the closing rod assembly 5 to move toward the proximal side of the stapler. The closing rod assembly 5 is connected to the closing tab 12. When the closing rod assembly 5 moves toward the proximal side, it drives the closing tab 12 to move toward the proximal side, thereby achieving closure of the staple head 9.

[0072] The connecting rod assembly 4 is an assembly formed by connecting two or more rod-shaped members with a revolute pair. In this embodiment, the connecting rod assembly 4 is described as including two rod-shaped members. Specifically, Figures 5 to 8 As shown, the connecting rod assembly 4 includes a first rod 41 and a second rod 42, and 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, a second matching portion 411 and a third pivot portion 413, and the second matching portion 411 is located on the side of the first rod 41 close to the firing handle 3. Specifically, the first pivot portion 412 of the first rod 41 is pivotally connected to the shell 13 of the stapler body 1 through a first pin 43. The first rod 41 is a triangular rod, and the first pivot portion 412 and the third pivot portion 413 are respectively provided at the first angular position and the second angular position of the triangular rod, and the second matching portion 411 is provided at the third angular position of the triangular rod. The structure of the triangular rod can make the cooperation between the first rod 41 and the firing handle 3 more stable. At the same time, the outer surface of the second engaging portion 411 is an arcuate surface. When the first engaging portion 32 of the firing handle 3 drives the first rod 41 to rotate via the second engaging portion 411, a relatively large engaging contact surface is always maintained between the first engaging portion 32 and the second engaging portion 411, thereby preventing jamming. In other alternative embodiments, the first rod 41 may also adopt other shapes, such as a straight rod, an arcuate rod, a trapezoidal rod, a diamond-shaped rod, etc.

[0073] The second rod 42 includes a second pivot portion 422 and a fourth pivot portion 423, and the third pivot portion 413 is pivotally connected to the fourth pivot portion 423. Specifically, the second rod 42 is a straight rod, with the second pivot portion 422 and the fourth pivot portion 423 provided at the first and second ends of the second rod 42, respectively. In other alternative embodiments, the second rod 42 may also adopt other shapes, such as a triangular rod, an arcuate rod, a trapezoidal rod, a diamond rod, etc. The third pivot portion 413 is pivotally connected to the fourth pivot portion 423 via a second pin 44, and the second pivot portion 422 is pivotally connected to the closing lever assembly 5 via a third pin 45. In this embodiment, the third pivot portion 413 includes a groove, and the fourth pivot portion 423 at least partially enters the groove of the third pivot portion 413. In another alternative embodiment, the fourth pivoting portion 423 may include a groove, and the third pivoting portion 413 at least partially enters the groove of the fourth pivoting portion 423 .

[0074] like Figure 6 As shown, when the firing handle 3 rotates in the direction S3, the first rod 41 is driven to rotate around the first pin 43 in the direction S3, and the second rod 42 rotates relative to the first rod 41 in the second direction, that is, the direction S4. The direction S4 is opposite to the direction S3. Figure 6 From the perspective of , the S4 direction is clockwise. Figure 5 and Figure 6 The figure shows the matching structure of the connecting rod assembly 4 and other components in the first state. At this time, the third pivoting portion 413 and the fourth pivoting portion 423 are located relatively far away from the connecting rod 18, and an angle a1 is formed between the first rod 41 and the second rod 42. The distance between the center of the second pivoting portion 422 and the center of the first pivoting portion 412 is L1. The connecting rod assembly 4 is in a relatively compact state in the axial direction. At this time, the outer surface of the second matching portion 411 of the first rod 41 abuts against the first matching portion 32 of the firing handle 3. The connecting rod assembly 4 is in a relatively stable state, which can ensure that the state of the connecting rod assembly 4 does not change when the firing handle 3 is not grasped, and the closing rod assembly 5 can be well maintained in its initial position.

[0075] like Figure 6 、 Figure 9 、 Figure 10As shown, the closing lever assembly 5 includes a connected sleeve portion 51 and a driving portion 52. The sleeve portion 51 is sleeved onto the exterior of the connecting rod 18 and pivotally connected to the second pivot portion 422. A mating hole 522 is provided at the distal end of the driving portion 52, which receives the third pin 45. A through-hole 511 is provided at the proximal end of the sleeve portion 51. The sleeve portion 51 is fixedly connected to the proximal end of the closing tab 12 via a connecting pin 53. When the driving portion 52 moves proximally, it drives the closing tab 12 proximally via the sleeve portion 51 and the connecting pin 53. A stop block 14 is also provided at the proximal end of the connecting rod 18. The stop block 14 is located proximally of the sleeve portion 51. A closing return spring 6 is interposed between the sleeve portion 51 and the stop block 14. The closing return spring 6 can be, for example, a compression spring. When the sleeve portion 51 moves proximally, the closing and returning spring 6 is compressed by the sleeve portion 51, causing elastic deformation. After the stapler is fired and the staple head 9 is opened, the closing and returning spring 6 applies a driving force toward the sleeve portion 51 in the distal direction, driving the sleeve portion 51 back to its initial position. In other alternative embodiments, the closing and returning spring 6 may be another type of spring, such as a tension spring.

[0076] like Figure 10 As shown, in this embodiment, the inner side surface of the housing 13 is provided with an axially extending guide groove 131, and the driving portion 52 of the closing lever assembly 5 is provided with a guide portion 521. This guide portion 521 is an axially extending ridge. The guide portion 521 at least partially enters the guide groove 131 and can move along the extension direction of the guide groove 131, thereby further limiting the movement of the driving portion 52 to the axial direction. In another alternative embodiment, a guide portion may also be provided on the inner side surface of the housing 13, and the driving portion 52 of the closing lever assembly 5 is provided with an axially extending guide groove. The guide portion at least partially enters the guide groove and can move along the extension direction of the guide groove. The guide portion provided on the driving portion 52 of the closing lever assembly 5 or the inner side surface of the housing 13 can be a ridge, a bump, a boss, etc. The inner side surfaces of both sides of the housing 13 can each be provided with a guide groove or guide portion, and correspondingly, a guide portion or guide groove is provided on each side of the driving portion 52. In another alternative embodiment, the guide groove or guide portion may be provided on only one side of the inner side surface of the housing 13 , and the guide portion or guide groove may be provided on the opposite side of the driving portion 52 .

[0077] As described above, when the connecting rod assembly 4 is in the first state and the firing handle 3 is gripped and rotated in the S3 direction, the first rod 41 rotates in the S3 direction around the first pin 43, and the second rod 42 rotates in the S4 direction relative to the first rod 41, thereby the connecting rod assembly 4 enters the second state. Figure 11 and Figure 12 The structure of the connecting rod assembly 4 of this embodiment is shown in the second state.

[0078] like Figure 11 As shown, after the connecting rod assembly 4 enters the second state from the first state, the third pivoting portion 413 and the fourth pivoting portion 423 move toward the direction closer to the connecting rod 18 compared to the first state, that is, in Figure 11 The connecting rod assembly 4 is in a relatively stable second state. The angle between the first rod 41 and the second rod 42 is a2, which is greater than Figure 6 In another embodiment, the angle a1 in the first state is shown in FIG. In another embodiment, the angle a1 in the first state is gradually increased to 180° during the process of the first state entering the second state, and then continues to move toward the direction of the connecting rod 18 to the angle a2. The distance between the center of the first pivoting portion 412 and the center of the second pivoting portion 422 is L2, and the distance L2 is greater than Figure 6 In the first state shown in FIG, the distance L1, the connecting rod assembly 4 is in a relatively extended axial state. Since the first pivoting portion 412 does not displace axially relative to the housing 13 of the stapler body 1, the second pivoting portion 422 moves proximally, driving the closing rod assembly 5 proximally. The sleeve portion 51 compresses and deforms the closing return spring 6, and the closing rod assembly 5 pulls the closing tab 12 proximally, thereby closing the staple head 9. At this point, because the second state of the connecting rod assembly 4 is relatively stable, even if the firing handle 3 is released and the firing handle 3 is returned to its initial position under the action of the handle return spring 15, the connecting rod assembly 4 can still remain in the second state.

[0079] like Figure 12 As shown, in this embodiment, the fourth pivot portion 423 is provided with a protrusion 421. When the connecting rod assembly 4 is in the second state, the protrusion 421 abuts against the outer wall of the groove, preventing the second rod 42 from continuing to rotate along the second direction relative to the first rod 41, thereby ensuring that the third pivot portion 413 and the fourth pivot portion 423 will not continue to move toward the direction close to the connecting rod 18, thereby ensuring the stability of the second state.

[0080] In another alternative embodiment, the fourth pivot portion 423 may include a groove, and the third pivot portion 413 at least partially enters the groove of the fourth pivot portion 423. The third pivot portion 413 is provided with a protrusion. When the connecting rod assembly 4 is in the second state, the protrusion abuts against the outer wall of the groove, preventing the second rod 42 from continuing to rotate in the second direction relative to the first rod 41, thereby ensuring the stability of the second state.

[0081] Therefore, the connecting rod assembly 4 of the present invention has two stable first and second states. When the stapler is in the initial state, the firing handle 3 is located at its initial position away from the fixed handle 11. The connecting rod assembly 4 is in the stable first state, which ensures the stability of the entire closing drive mechanism when the firing handle 3 is not grasped, and the closing tab 12 does not move axially. When the stapler needs to be closed, the firing handle 3 is grasped and rotated toward the fixed handle 11, driving the connecting rod assembly 4 to enter the second state and maintain it in the stable second state. At this time, the stapler's staple head 9 can be closed by driving the closing tab 12 to move proximally. In this state, continue to hold the firing handle 3, and the claw 31 of the firing handle 3 can cooperate with the rack 21 of the actuating rod 2 to drive the push rod inside the stapler body 1 to drive the nail head 9 to complete the firing of the stapler. During the firing process of the stapler, the connecting rod assembly 4 can always be stably maintained in the second state, which can ensure that the closing pull tab 12 will not move toward the distal side, thereby improving the surgical effect.

[0082] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A closed drive mechanism, characterized in that: Used for a medical stapler, the stapler comprises a stapler head and a stapler body, and the closing drive mechanism comprises: A connecting rod assembly includes a first rod and a second rod, the second rod being located on a 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, the first pivot portion being pivotally connected to the stapler body, the second pivot portion being located on a proximal side of the first pivot portion, the first rod being provided with a second mating portion, and the connecting rod assembly having a first state and a second state; A firing handle comprising a first mating portion; a closing pull rod assembly pivotally connected to the second pivotal portion of the connecting rod assembly; In which, when the connecting rod assembly is in the first state and the firing handle rotates in the first direction, the outer surface of the first matching portion and the second matching portion abut and drive the first rod to rotate in the first direction, and the second rod rotates in the second direction relative to the first rod, the second direction is opposite to the first direction, and the angle between the first rod and the second rod increases, so that the connecting rod assembly enters the second state, the second pivotal portion of the connecting rod assembly moves toward the proximal side of the stapler, and drives the closing pull rod assembly to move toward the proximal side of the stapler to close the nail head of the stapler; after the firing handle is released to reset the firing handle, the connecting rod assembly remains in the second state.

2. The closing drive mechanism according to claim 1, characterized in that: The anastomosis device body includes a connecting rod, and the closing pull rod assembly is sleeved on the outside of the connecting rod. When the connecting rod assembly enters the second state from the first state, the third pivot part and the fourth pivot part move toward the direction close to the connecting rod, driving the closing pull rod assembly to move toward the proximal side of the connecting rod.

3. The closing drive mechanism according to claim 2, characterized in that: The anastomosis device body also includes a closing pull tab located inside the connecting rod. The closing pull rod assembly includes a sleeve portion and a driving portion that are connected to each other. The sleeve portion is sleeved on the outside of the connecting rod and connected to the proximal side of the closing pull tab. The driving portion is pivotally connected to the second pivot portion.

4. The closing drive mechanism according to claim 3, characterized in that: The stapler body further comprises a shell, an inner side surface of which is provided with a guide groove extending in an axial direction, and the driving portion of the closing rod assembly is provided with a guide portion, the guide portion at least partially enters the guide groove and is movable along the extension direction of the guide groove; or The inner side surface of the housing is provided with a guide portion, and the driving portion of the closing pull rod assembly is provided with a guide groove extending in the axial direction. The guide portion at least partially enters the guide groove and can move along the extension direction of the guide groove.

5. The closing drive mechanism according to claim 3, characterized in that: The closing pull rod assembly also includes a connecting pin. A through hole is provided on the distal side of the sleeve portion. The connecting pin passes through the through hole on the distal side of the sleeve portion and the proximal side of the closing pull tab to fixedly connect the sleeve portion and the closing pull tab.

6. The closing drive mechanism according to claim 3, characterized in that: A stop block is further provided on the proximal side of the connecting rod, and a closing return spring is provided between the sleeve portion and the stop block. When the connecting rod assembly enters the second state from the first state, the closing return spring is compressed toward the proximal end by the sleeve portion.

7. The closing drive mechanism according to claim 1, characterized in that: The third pivoting portion includes a groove, and the fourth pivoting portion at least partially enters the groove of the third pivoting portion; or the fourth pivoting portion includes a groove, and the third pivoting portion at least partially enters the groove of the fourth pivoting portion.

8. The closing drive mechanism according to claim 7, characterized in that: The third pivoting portion includes a groove, the fourth pivoting portion at least partially enters the groove of the third pivoting portion, the fourth pivoting portion is provided with a protrusion, and when the connecting rod assembly is in the second state, the protrusion abuts against the outer wall of the groove to prevent the second rod from continuing to rotate relative to the first rod in the second direction; or The fourth pivot portion includes a groove, the third pivot portion at least partially enters the groove of the fourth pivot portion, and the third pivot portion is provided with a protrusion. When the connecting rod assembly is in the second state, the protrusion abuts against the outer wall of the groove, preventing the second rod from continuing to rotate in the second direction relative to the first rod.

9. The closing drive mechanism according to claim 1, characterized in that: When the connecting rod assembly is in the first state and the firing handle is in the initial position, the second matching portion abuts against the first matching portion of the firing handle.

10. The closing drive mechanism according to claim 9, characterized in that: The first rod is a triangular rod, the first pivoting portion and the third pivoting portion are respectively provided at the first angular position and the second angular position of the triangular rod, and the second matching portion is provided at the third angular position of the triangular rod.

11. The closing drive mechanism according to claim 10, characterized in that: The outer surface of the second matching portion is an arc-shaped surface.

12. The closing drive mechanism according to claim 1, characterized in that: The second rod is a straight rod, and the first end and the second end of the second rod are respectively provided with the second pivoting portion and the fourth pivoting portion.

13. The closing drive mechanism according to claim 1, characterized in that: The stapler body includes a shell, the connecting rod assembly is located inside the shell, and the first pivoting portion is pivotally connected to the inner side surface of the shell.

14. A medical stapler, characterized in that: The device comprises the closing drive mechanism according to any one of claims 1 to 13.

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