Closed switching mechanism and medical stapler

Abstract

The present invention provides a closing switching mechanism and a medical stapler. The closing switching mechanism includes: a connecting rod assembly including a first rod and a second rod, the third pivotal portion of the first rod being pivotally connected to the fourth pivotal portion of the second rod, and the connecting rod assembly including a first state and a second state; an actuating rod including a switching drive member; a closing pull rod assembly pivotally connected to the second pivotal portion; and a closing pull tab. The closing connecting rod mechanism can close the stapler's stapler head by pulling the closing pull tab when moving in the proximal direction. After the stapler is fired, the connecting rod assembly is in the second state, and when the actuating rod moves from the second position region to the first position region, the switching drive member presses the connecting rod assembly in a direction away from the actuating rod, causing the connecting rod assembly to enter the first state, the third pivotal portion and the fourth pivotal portion to move in a direction away from the actuating rod, and the second pivotal portion drives the closing pull rod assembly to move in the distal direction of the stapler, thereby automatically opening the stapler head.

Description

Technical Field

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

[0002] The medical stapler includes a medical stapler body, a firing handle movably connected to the medical stapler body, and a staple head that cooperates with the body. The staple head includes a stapler assembly and an anvil that are arranged 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 switching mechanism, thereby closing 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 and switching mechanism has a relatively complex structure. Moreover, after the stapler is fired, the staple head cannot be opened automatically and needs to be opened manually by the operator, which is very inconvenient. Summary of the Invention

[0004] In response to the problems in the prior art, the purpose of the present invention is to provide a closing switching mechanism and a medical stapler, in which the closing link mechanism can close the stapler's nail head when moving toward the proximal side, and after the stapler's nail head is closed, the nail head is automatically opened when the actuator rod is pulled toward the proximal side.

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

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

[0007] an actuating lever including a switching drive member, the actuating lever including a first position region and a second position region, the second position region being located distally of the first position region;

[0008] a closing rod assembly and a closing tab, wherein the closing rod assembly is pivotally connected to the second pivot portion, and a proximal end side of the closing tab is fixedly connected to the closing rod assembly;

[0009] In which, when the connecting rod assembly is in the second state and the actuating rod moves from the second position area to the first position area, the switching drive member presses the connecting rod assembly in the direction away from the actuating rod, so that the connecting rod assembly enters the first state, the third pivot part and the fourth pivot part move in the direction away from the actuating rod, and the second pivot part drives the closing pull tab to move toward the distal side of the anastomosis device through the closing pull rod assembly.

[0010] In some embodiments, the connecting rod assembly further comprises a driving button, the first rod is pivotally connected to the second rod, the driving button is mounted on the first rod or the second rod, and a first end of the driving button protrudes from a side surface of the first rod or the second rod facing the actuating rod;

[0011] When the connecting rod assembly is in the second state and the actuating rod moves from the second position region to the first position region, the switching driving member presses the first end of the driving button in a direction away from the actuating rod.

[0012] In some embodiments, when the linkage assembly is in the second state and the actuating rod moves from the first position region to the second position region, the first rod does not rotate relative to the second rod;

[0013] When the linkage assembly is in the second state and the actuating rod moves from the second position region to the first position region, the first rod pivots relative to the second rod.

[0014] In some embodiments, when the connecting rod assembly is in the second state and the actuating rod moves from the first position area to the second position area, the switching drive member drives the first end of the driving button to move toward the distal side without blocking the movement of the actuating rod.

[0015] In some embodiments, a mounting groove is provided on a surface of the first rod or the second rod facing the actuating rod, and the driving button is installed in the mounting groove.

[0016] In some embodiments, the mounting slot includes a first side wall, a second side wall and a bottom wall, the first side wall of the mounting slot is located on the distal side of the second side wall, and there is a first gap between the drive button and the first side wall of the mounting slot. When the connecting rod assembly is in the first state, the drive button is abutted against the second side wall of the mounting slot. When the connecting rod assembly is in the second state and the actuating rod moves from the first position area to the second position area, the drive button moves toward the first side wall of the mounting slot.

[0017] In some embodiments, the connecting rod assembly also includes an elastic member, which is installed between the driving button and the first side wall so that the driving button tends to approach the second side wall. When the driving button moves toward the first side wall, the driving button compresses the elastic member to cause elastic deformation.

[0018] In some embodiments, the elastic member is a spring sheet, the first end of which is connected to the side of the driving button facing the second side wall of the mounting slot, the second end of the spring sheet is provided with a bending portion, the second side wall of the mounting slot is provided with a stop groove, and the bending portion of the spring sheet enters the stop groove.

[0019] In some embodiments, the second end of the driving button is pivotally connected to the bottom wall of the mounting slot.

[0020] In some embodiments, at least a portion of the outer side wall of the second end of the drive button is a first arc surface, and at least a portion of the bottom wall of the mounting groove is a second arc surface. The first arc surface is in contact with the second arc surface, and the first arc surface can rotate relative to the second arc surface.

[0021] In some embodiments, the switching drive member is a rack disposed on a side of the actuating rod facing the connecting rod assembly.

[0022] In some embodiments, a driving button is provided on at least one side of the first rod, the driving button is rotatably connected to the side wall of the first rod, and the switching driving member is a driving tooth provided on at least one side of the actuating rod.

[0023] In some embodiments, the first rod is further provided with a stop portion, the stop portion is located on the proximal side of the driving button, and the stop portion blocks the movement of the second end of the driving button toward the proximal side.

[0024] In some embodiments, the third pivot portion is pivotally connected to the fourth pivot portion via a pin shaft, the driving button is disposed on the third pivot portion, and the first end of the driving button can rotate toward the distal side around the pin shaft.

[0025] In some embodiments, the driving tooth includes a first side wall and a second side wall, the first side wall of the driving tooth is located on the distal side of the second side wall, the first side wall of the driving tooth is a vertical surface, and the second side wall of the driving tooth is a guiding surface.

[0026] In some embodiments, a firing handle is further included, wherein the firing handle includes a first mating portion, and the connecting rod assembly further includes a second mating portion;

[0027] When the connecting rod assembly is in the first state and the firing handle rotates in the first direction, the first mating portion drives the connecting rod assembly to enter the second state through the second mating portion, the third pivot portion and the fourth pivot portion move toward the direction approaching the actuating rod, and the second pivot 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.

[0028] In some embodiments, 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 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.

[0029] In some embodiments, when the connecting rod assembly is in the first state, the second matching portion abuts against the first matching portion.

[0030] 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

[0031] 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.

[0032] In some embodiments, a connecting rod is further included, and the closing pull rod assembly includes a sleeve portion and a driving portion. The connecting rod extends along the axial direction of the anastomosis device, and the actuating rod and the sleeve portion are both sleeved on the outside of the connecting rod, and the sleeve portion is located on the proximal side of the actuating rod.

[0033] 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,

[0034] 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.

[0035] An embodiment of the present invention further provides a medical stapler, comprising the above-mentioned closing switching mechanism.

[0036] The closed switching mechanism and medical stapler provided by the present invention have the following advantages:

[0037] By adopting the present invention, the closing link mechanism can close the stapler's stapler head by pulling the closing pull tab when moving in the proximal direction. After the stapler is fired, the link assembly is in the second state, and when the actuating rod moves from the second position region to the first position region, the switching drive member presses the link assembly in a direction away from the actuating rod, causing the link assembly to enter the first state, the third pivotal portion and the fourth pivotal portion to move in a direction away from the actuating rod, and the second pivotal portion drives the closing pull rod assembly to move in the distal direction of the stapler, thereby automatically opening the stapler head. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] Figure 1 is a schematic structural diagram of the stapler according to the first embodiment of the present invention;

[0040] Figure 2 This is a schematic structural diagram of the cooperation between the nail head and the pull tab according to the first embodiment of the present invention;

[0041] Figure 3 This is a schematic structural diagram of the stapler body of the first embodiment of the present invention without a shell on one side;

[0042] Figure 4 is a structural diagram of a closed switching mechanism according to a first embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of the closing switching mechanism of the first embodiment of the present invention, omitting the firing handle, wherein part of the connecting rod is omitted;

[0044] Figure 6 2 is a schematic structural diagram of the connecting rod assembly according to the first embodiment of the present invention in a first state in cooperation with other components;

[0045] Figure 7 is an exploded view of a connecting rod assembly according to a first embodiment of the present invention;

[0046] Figure 8 is a top view of the connecting rod assembly according to the first embodiment of the present invention in a first state;

[0047] Figure 9 yes Figure 8 A1-A1 cross-sectional view;

[0048] Figure 10 is a schematic structural diagram of the connecting rod assembly according to the first embodiment of the present invention in cooperation with other components in the second state;

[0049] Figure 11 is a schematic structural diagram of the connecting rod assembly of the first embodiment of the present invention in the second state;

[0050] Figure 12 is a cross-sectional view of the connecting rod assembly of the first embodiment of the present invention in the second state;

[0051] Figure 13 This is a structural diagram of the first end of the driving button of the first embodiment of the present invention entering the installation slot;

[0052] Figure 14 This is a schematic diagram of the structure of the rack acting on the driving button in the first embodiment of the present invention;

[0053] Figure 15 2. It is a schematic structural diagram of the cooperation between the connecting rod assembly and the partially closed pull rod assembly according to the first embodiment of the present invention;

[0054] Figure 16 is a schematic structural diagram of a connecting rod assembly according to a second embodiment of the present invention in a second state;

[0055] Figure 17 is a cross-sectional view of a connecting rod assembly according to a second embodiment of the present invention in a second state;

[0056] Figure 18 This is a structural diagram of the first end of the driving button of the second embodiment of the present invention entering the installation slot;

[0057] Figure 19 2 is a schematic diagram of the structure of the rack acting on the driving button according to the second embodiment of the present invention;

[0058] Figure 20 is a partial structural diagram of a closed switching mechanism according to a third embodiment of the present invention;

[0059] Figure 21 is a schematic structural diagram of an actuating rod according to a third embodiment of the present invention;

[0060] Figure 22 It is a schematic structural diagram of the cooperation between the connecting rod assembly and the partially closed pull rod assembly according to the third embodiment of the present invention.

[0061] Reference numerals:

[0062] 1 Stapler body 421 protrusion

[0063] 11 Fixed handle 422 Second pivoting portion

[0064] 12 Closing pull tab 423 Fourth pivoting portion

[0065] 13 Shell 424 Second mounting slot

[0066] 131 guide groove 4241 second mounting groove first side wall

[0067] 14 Stop block 4242 Second side wall of second mounting groove

[0068] 15 Handle return spring 4243 Second installation groove bottom wall

[0069] 18 Connecting rod 4244 second stop groove

[0070] 2 Actuating rod 43 First pin

[0071] 21 rack 44 second pin

[0072] 22 driving gear 45 third pin

[0073] 221 driving tooth first side wall 46 driving button (embodiments 1 and 2)

[0074] 222 driving tooth second side wall 461 arc surface

[0075] 23 Fourth pin 47 Elastic member

[0076] 3. Firing handle 471 bending portion

[0077] 31 claw 48 drive button (Example 3)

[0078] 32 First mating portion 5 Closed pull rod assembly

[0079] 4 Connecting rod assembly 51 sleeve portion

[0080] 41 First rod 52 Driving unit

[0081] 411 second matching portion 521 guide portion

[0082] 412 first pivot portion 53 connecting pin

[0083] 413 Third pivoting portion 6 closed return spring

[0084] 414 First installation slot 7 retraction rod

[0085] 4141 First mounting groove first side wall 9 nail head

[0086] 4142 First mounting groove second side wall 91 nail anvil

[0087] 4143 First mounting groove bottom wall 911 First matching groove

[0088] 4144 First stop groove 92 Nail magazine assembly

[0089] 415 stopper 921 second matching groove

[0090] 42 Second rod 93 Closing pin DETAILED DESCRIPTION

[0091] 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.

[0092] The present invention provides a closing switching mechanism for a medical stapler and a medical stapler including the closing switching mechanism. The stapler also includes a nail head and a stapler body, and the nail head is arranged on the distal side of the stapler body. The closing switching mechanism includes a connecting rod assembly, an actuating rod, a closing pull rod assembly and a closing pull tab. 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 a first pivot portion and a third pivot portion, the second rod includes a second pivot portion and a fourth pivot portion, the first pivot portion is pivotally connected to the stapler body, the third pivot portion is pivotally connected to the fourth pivot portion, and the connecting rod assembly includes a first state and a second state. The actuating rod includes a switching drive member, the actuating rod includes a first position area and a second position area, and the second position area is located on the distal side of the first position area.

[0093] In the initial state, the connecting rod assembly is in the first state, and the actuating rod is in the first position area. After the stapler's nail head reaches the surgical position, the connecting rod assembly switches from the first state to the second state, and the second pivot portion drives the closing rod assembly to move toward the proximal side of the stapler, while the third pivot portion and the fourth pivot portion move toward the actuating rod. The closing rod assembly is pivotally connected to the second pivot portion, the proximal side of the closing pull tab is fixedly connected to the closing rod assembly, and the distal side of the closing pull tab is connected to the nail head. Therefore, when the closing rod assembly moves toward the proximal side of the stapler, it can drive the closing pull tab to move toward the proximal side of the stapler, thereby closing the nail head of the stapler.

[0094] During the firing process of the stapler, the connecting rod assembly remains in the second state, and the actuating rod moves from the first position area to the second position area in the distal direction. After the stapler is fired, the connecting rod assembly is in the second state, and when the actuating rod is driven to move from the second position area to the first position area, the switching drive member presses the connecting rod assembly in a direction away from the actuating rod, so that the connecting rod assembly enters the first state, the third pivotal portion and the fourth pivotal portion move in a direction away from the actuating rod, and the second pivotal portion drives the closing pull tab to move in the distal direction of the stapler through the closing pull rod assembly, thereby realizing the automatic opening of the stapler's nail head.

[0095] The structures of the closing switching mechanism and the stapler of each specific embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0096] like Figures 1 to 14 The figure is a schematic diagram of the structure of the closing switching mechanism and the stapler of the first embodiment of the present invention. The stapler includes a nail head 9, a stapler body and the closing switching mechanism, and the nail head 9 is arranged at the distal end of the stapler body. The nail head 9 is arranged at the distal end of the stapler body 1. Figure 1 and Figure 2 As shown, the nail head 9 comprises an anvil 91 and a staple cartridge assembly 92 positioned 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). The proximal end of the anvil 91 is provided with an inclined first mating slot 911, and the proximal end of the staple cartridge assembly 92 is provided with an axially extending second mating slot 921. A closing pin 93 extends through both the first mating slot 911 and the second mating slot 921. The closing switching mechanism includes a closing tab 12 for closing the nail head 9. The distal end of the closing tab 12 is connected to the closing pin 93. In the initial state, the closing pin 93 is located distally of the second mating slot 921, and the anvil 91 is in the third state. When the closing tab 12 pulls the closing pin 93 from the distal end of the second mating slot 921 toward the proximal end, the anvil 91 enters the fourth state, in which the anvil 91 and the staple cartridge assembly 92 clamp tissue. The process of the anvil 91 transitioning from the third state to the fourth state is called the closing process of the stapler head 9, that is, the closing process of the stapler. During the firing process of the stapler, the stapler head 9 needs to be kept closed. After the stapler is fired, the closing pin 93 and the closing tab 12 move toward the distal end, thereby opening the stapler head 9.

[0097] 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 4 The S2 direction is the longitudinal direction, that is, the height direction.

[0098] like Figures 3 to 7 As shown, the closed switching mechanism also includes a connecting rod assembly 4, an actuating rod 2, and a closing pull rod assembly 5. The connecting rod assembly 4 includes a first rod 41 and a second rod 42. The second rod 42 is located on the proximal side of the first rod 41. The first rod 41 includes a first pivot portion 412 and a third pivot portion 413. The second rod 42 includes a second pivot portion 422 and a fourth pivot portion 423. The first pivot portion 412 is pivotally connected to the housing 13 of the stapler body via a first pin 43. That is, the first pivot portion 412 can only rotate relative to the stapler body and cannot move axially. In the axial direction, the first pivot portion 412 is in a relatively fixed position. The third pivot portion 413 is pivotally connected to the fourth pivot portion 423 via a second pin 44. The second pivot portion 422 is pivotally connected to the closing pull rod assembly 5 via a third pin 45. In this embodiment, the third pivoting portion 413 includes a groove, and the fourth pivoting portion 423 at least partially enters the groove of the third pivoting portion 413. In another alternative embodiment, the fourth pivoting portion 423 may also include a groove, and the third pivoting portion 413 at least partially enters the groove of the fourth pivoting portion 423.

[0099] The connecting rod assembly 4 includes 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 third position area. When the connecting rod assembly 4 is in the second state, the second pivoting portion 422 is in the fourth position area, and the fourth position area is on the proximal side of the third position area. That is, in the process of the connecting rod assembly 4 entering the second state from the first state, the second pivoting portion 422 moves toward the proximal side of the anastomosis device. The actuating rod 2 includes a switching drive member. In this embodiment, the switching drive member is a rack 21 provided on one side of the actuating rod 2. The actuating rod 2 includes a first position area and a second position area, and the second position area is located on the distal side of the first position area.

[0100] In this embodiment, the first position region refers to the position of the actuating rod 2 in the initial state of the stapler, that is, Figure 3 The position of the actuator rod 2 shown. The second position area refers to the position area where the actuator rod 2 is located after the stapler is fired. During the firing process of the stapler, the firing handle 3 is held, and the actuator rod 2 is driven to move from the first position area to the second position area through the cooperation between the claw 31 of the firing handle 3 and the rack 21. The retraction rod 7 is fixed on the actuator rod 2, and therefore also moves toward the distal side along with the actuator rod 2. The actuator rod 2 drives the firing rod on the distal side to fire the stapler. After the stapler is fired, the actuator rod 2 is in the second position area. By operating the retraction rod 7 to move toward the proximal side, the retraction rod 7 drives the actuator rod 2 to return from the second position area to the initial first position area.

[0101] When the connecting rod assembly 4 switches from the first state to the second state, the second pivoting portion 422 drives the closing tab 12 to move toward the proximal side of the stapler through the closing pull rod assembly 5, thereby closing the staple head 9. When the connecting rod assembly 4 is in the second state and the actuating rod 2 moves from the second position region to the first position region, the switching drive member presses the connecting rod assembly 4 in a direction away from the actuating rod 2, causing the connecting rod assembly 4 to enter the first state, the third pivoting portion 413 and the fourth pivoting portion 423 to move away from the actuating rod 2, and the second pivoting portion 422 drives the closing tab 12 to move toward the distal side of the stapler through the closing pull rod assembly 5, thereby achieving automatic opening of the staple head 9.

[0102] like Figure 3 and Figure 4As shown, the stapler body includes a housing 13 and a fixed handle 11. The closing switching mechanism also includes a firing handle 3, which is movably connected to the stapler body. A handle return spring 15 is disposed within the stapler body. The firing handle 3 is provided with a claw 3 that can engage with the rack 21. The firing handle 3 also includes a first mating portion 32, which is a raised structure provided on the side of the firing handle 3 facing the connecting rod assembly 4. The first rod 41 also includes a second mating portion 411. The first rod 41 is a triangular rod. The first pivoting portion 412 and the third pivoting portion 413 are provided at the first and second angular positions of the triangular rod, respectively. The second mating portion 411 is provided at the third angular position of the triangular rod. The triangular rod structure can ensure a more stable mating between the first rod 41 and the firing handle 3. In other alternative embodiments, the first rod 41 can also adopt other shapes, such as a straight rod, an arcuate rod, a trapezoidal rod, a diamond rod, etc. Figure 3 The initial position of the firing handle 3 is shown in FIG. The firing handle 3 rotates in a first direction when being held. The first direction is Figure 3 In the middle S3 direction, the handle return spring 15 is compressed and deformed. When the connecting rod assembly 4 is in the first state and the firing handle 3 rotates in the first direction, the firing handle 3 pushes the second fitting portion 411 through the first fitting portion 32 to drive the connecting rod assembly 4 from the first state to the second state.

[0103] like Figure 5 As shown, the closing pull rod assembly 5 includes a sleeve portion 51 and a driving portion 52. The closed switching mechanism also includes a connecting rod 18 extending along the axial direction of the anastomosis device, and the distal side of the connecting rod 18 is connected to the proximal side of the nail head 9. The actuating rod 2 and the sleeve portion 51 are both sleeved on the outside of the connecting rod 18, and the sleeve portion 51 is located on the proximal side of the actuating rod 2. A stop block 14 is provided on the proximal side of the connecting rod 18, and a closing reset spring 6 is provided between the sleeve portion 51 and the stop block 14, which can be, for example, a compression spring. The sleeve portion 51 is fixedly connected to the proximal side of the closing pull tab 12 by a connecting pin 53. When the driving portion 52 moves toward the proximal side, the closing pull tab 12 is driven to move toward the proximal side through the sleeve portion 51 and the connecting pin 53. As shown Figure 3 and Figure 5As shown, the inner side surface of the housing 13 is provided with a guide groove 131 extending in the axial direction, and the driving portion 52 of the closing rod assembly 5 is provided with a guide portion 521. 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 driving portion 52 to only move in the axial direction. In another alternative embodiment, the guide portion 521 can also be provided on the inner side surface of the housing 13, and the driving portion 52 of the closing rod assembly 5 is provided with a guide groove 131 extending in the axial direction. The guide portion 521 provided on the driving portion 52 of the closing rod assembly 5 or the inner side surface of the housing 13 can be a convex strip, or a bump, a boss, etc. The inner side surfaces of the two side shells 13 may each be provided with a guide groove 131 or a guide portion 521, and correspondingly, the two sides of the driving portion 52 may each be provided with a guide portion 521 or a guide groove 131. In another alternative embodiment, only one side of the inner side surface of the shell 13 may be provided with a guide groove 131 or a guide portion 521, and the opposite side of the driving portion 52 may be provided with a guide portion 521 or a guide groove 131.

[0104] like Figures 4 to 9As shown, the connecting rod assembly 4 also includes a driving button 46. A first mounting slot 414 is provided on the side of the first rod 41 facing the actuating rod 2. The second end of the driving button 46 is mounted in the first mounting slot 414, and the first end of the driving button 46 protrudes from the side of the first rod 41 facing the actuating rod 2. The first mounting slot 414 includes a first sidewall 4141, a second sidewall 4142, and a bottom wall 4143. The first sidewall 4141 is located distally from the second sidewall 4142. In the initial state, the driving button 46 is positioned adjacent to the second sidewall 4142 of the first mounting hole, with a first gap between the first sidewall 4141 and the first sidewall 4141. An elastic member 47 is provided between the driving button 46 and the first sidewall 4141, which encourages the driving button 46 to move closer to the second sidewall 4142. When the connecting rod assembly 4 is in the first state, the driving button 46 abuts against the second sidewall 4142. In this embodiment, the elastic member 47 is a spring, such as a metal spring or a plastic spring. The first end of the spring is connected to the drive button 46, and the second end of the spring has a bent portion 471. A first stop groove 4144 is provided at the distal end of the first sidewall 4141, into which the bent portion 471 enters, maintaining the stability of the spring's position. The second end of the drive button 46 is pivotally connected to the bottom wall 4143 of the first mounting slot 414. At least a portion of the outer wall of the second end of the drive button 46 is formed as a first arcuate surface 461, while at least a portion of the bottom wall 4143 of the first mounting slot 414 is formed as a second arcuate surface. The first arcuate surface 461 mates with the second arcuate surface and is rotatable relative to the second arcuate surface. When the connecting rod assembly 4 is in the second state and the actuating rod 2 moves from the second position region to the first position region, the rack 21 presses the first end of the drive button 46 away from the actuating rod 2. In another alternative embodiment, the elastic member 47 may also be a spring or other elastic components.

[0105] The working principle of the closing switching mechanism will be described in detail below in conjunction with each stage of the stapler.

[0106] like Figures 4 to 9 As shown, in the initial state, the connecting rod assembly 4 is in the first state, the firing handle 3 is located at the initial position away from the fixed handle 11, and the actuating rod 2 is in the first position area. Figure 6 As shown, at this time, the third pivoting portion 413 and the fourth pivoting portion 423 are located relatively far away from the actuating rod 2. The distance between the center of the first pivoting portion 412 and the center of the second pivoting portion 422 is L1, and the connecting rod assembly 4 is in a relatively compact state in the axial direction, and as shown in FIG. Figure 9As shown, an angle a1 is formed between the first rod 41 and the second rod 42, the driving button 46 is arranged near the second side wall 4142 of the first mounting groove 414, and the first end of the driving button 46 protrudes from the side surface of the first rod 41 facing the actuating rod 2. Since the third pivot portion 413 and the fourth pivot portion 423 are relatively far away from the actuating rod 2, the rack 21 will not act on the driving button 46. At this time, the outer surface of the second mating portion 411 of the first rod 41 is in abutment with the first mating 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 pull rod assembly 5 can be well maintained in its initial position.

[0107] After the nail head 9 reaches the surgical site, the firing handle 3 is held, and the firing handle 3 rotates in the first direction, and the second rod 42 rotates in the second direction, that is, the direction S4, relative to the first rod 41. Figure 6 From the perspective of , the S4 direction is clockwise. Figures 10-12 The structure of the connecting rod assembly 4 after entering the second state is shown.

[0108] like Figures 10-12 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 actuating rod 2 compared to the first state, that is, in Figure 10 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 expanded state in the axial direction. Figure 12 As shown, the angle between the first rod 41 and the second rod 42 is a2, and the angle a2 is greater than Figure 9 The angle a1 in the first state is shown in FIG. Since the first pivoting portion 412 does not displace axially relative to the housing 13, the second pivoting portion 422 moves proximally, driving the closing rod assembly 5 to move proximally. The sleeve portion 51 compresses the closing return spring 6 to deform, and the closing rod assembly 5 pulls the closing tab 12 to move proximally, thereby closing the nail head 9.

[0109] like Figure 11As shown, 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 relative to the first rod 41 along the second direction, 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.

[0110] 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 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 in the second direction relative to the first rod 41, thereby ensuring the stability of the second state.

[0111] 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 in its initial position away from the fixed handle 11. The connecting rod assembly 4 is in the stable first state, which ensures the overall stability of the closing switching mechanism when the firing handle 3 is not grasped, and the closing tab 12 does not undergo axial movement. 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 into the second state and maintaining it in the stable second state. At this time, the stapler's staple head 9 can be closed by driving the closing tab 12 in the proximal direction. At this time, 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 maintain the second state. 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 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.

[0112] During the firing process of the stapler, the connecting rod assembly 4 remains in the second state. Continue to hold the firing handle 3, the claw 31 of the firing handle 3 drives the rack 21, so that the rack 21 drives the actuating rod 2 to move from the first position area to the second position area on the distal side, and the retraction rod 7 also moves toward the distal side. Figure 13As shown, during the firing process of the stapler, the teeth of the rack 21 contact the first end of the drive button 46 and drive the first end of the drive button 46 toward the distal end. The first end of the drive button 46 at least partially enters the first mounting slot 414, and the elastic member 47 is compressed and elastically deformed. At this time, the drive button 46 does not block the distal movement of the rack 21, and the third pivot portion 413 and the fourth pivot portion 423 are not compressed to move away from the actuating rod 2. The connecting rod assembly 4 can remain in the second state, maintaining the stability of the closed position of the stapler head 9 and preventing the stapler head 9 from accidentally opening during the firing process.

[0113] After the stapler is fired, the actuating rod 2 moves to the second position area. The rack 21 moves to the distal side of the first end of the driving button 46. The driving button 46 is no longer affected by the rack 21. Under the deformation recovery force of the elastic member 47, the first end of the driving button 46 rotates toward the proximal side and returns to the Figure 12 The actuating rod 2 is also connected to the state shown in FIG. Figure 4 ) is connected to the retraction rod 7 (shown in Figure 1 ), a rod groove for guiding the movement of the retraction rod 7 is provided on the housing 13. When the actuating rod 2 moves to the second position area, the retraction rod 7 moves to the distal side of the rod groove. At this time, the operator manually operates the retraction rod 7 to move toward the proximal side of the rod groove, and the retraction rod 7 drives the actuating rod 2 to move toward the proximal side. Figure 14 As shown, when the rack 21 moves from the second position area to the first position area, the rack 21 presses the driving button 46 in the direction away from the actuating rod 2. The first end of the driving button 46 is stopped by the second side wall 4142 of the first mounting groove 414 and cannot rotate in the proximal direction, which will hinder the movement of the rack 21 in the proximal direction. The rack 21 exerts a downward force on the first end of the driving button 46, and the third pivot portion 413 and the fourth pivot portion 423 move in the direction away from the actuating rod 2 ( Figure 14 The connecting rod assembly 4 enters the first state, and at the same time, the second pivoting portion 422 drives the closing pull tab 12 to move toward the distal end side of the stapler through the closing pull rod assembly 5, thereby realizing the automatic opening of the stapler's nail head 9.

[0114] like Figures 15-19, which is a partial structural diagram of the closing switching mechanism of the second embodiment of the present invention. The only difference between this embodiment and the first embodiment is that a second mounting groove 424 is provided on the side of the second rod 42 facing the actuating rod 2, and the second end of the driving button 46 is installed in the second mounting groove 424. The second mounting groove 424 includes a first side wall 4241, a second side wall 4242, and a bottom wall 4243, wherein the first side wall 4241 is located on the distal side of the second side wall 4242. In the initial state, the driving button 46 is arranged near the second side wall 4242 of the first mounting hole, and has a first gap between it and the first side wall 4241. An elastic member 47 is provided between the driving button 46 and the first side wall 4241. In this embodiment, the elastic member 47 is a spring, such as a metal or plastic spring. The first end of the spring is connected to the drive button 46, and the second end of the spring has a bent portion 471. A second stop groove 4244 is provided at the distal end of the first sidewall 4241, into which the bent portion 471 enters, maintaining the stability of the spring's position. At least a portion of the outer wall of the second end of the drive button 46 is formed as a first arcuate surface 461, and at least a portion of the bottom wall 4243 of the second mounting groove 424 is formed as a second arcuate surface. The first arcuate surface 461 mates with the second arcuate surface and is rotatable relative to the second arcuate surface. When the connecting rod assembly 4 is in the second state and the actuating rod 2 moves from the second position region to the first position region, the rack 21 presses the first end of the drive button 46 away from the actuating rod 2. In an alternative embodiment, the elastic member 47 may also be a spring or other elastic component. The structures of other components in the second embodiment, such as the actuating rod 2, the firing handle 3, the connecting rod 18, the closing pull tab 12, the closing pull rod assembly 5, the stapler body, the nail head 9, etc., may be the same as those in the first embodiment, or may be different from the first embodiment and adopt other structures, all of which fall within the scope of protection of the present invention.

[0115] The principle of stapler closing in the second embodiment is the same as that in the first embodiment. Figure 17 The figure shows the structure when the connecting member is in the second state and the rack 21 does not act on the driving button 46. At this time, the first end of the driving button 46 protrudes from the side surface of the second rod 42 facing the actuating rod 2. Figure 18 As shown, during the firing process of the stapler, the rack 21 drives the first end of the driving button 46 to move toward the distal side and at least partially enter the second mounting groove 424 so as not to block the movement of the rack 21 toward the distal side. Figure 19As shown, after the stapler is fired, the retraction rod 7 is pulled toward the proximal side, and the rack 21 moves toward the proximal side and acts on the first end of the drive button 46, giving the drive button 46 a pressure in the direction away from the actuating rod 2, so that the third pivot part 413 and the fourth pivot part 423 move in the direction away from the actuating rod 2, and the connecting rod assembly 4 returns to the first state. At the same time, the second pivot part 422 drives the closing pull tab 12 to move toward the proximal side through the closing pull rod assembly 5, thereby automatically opening the nail head 9.

[0116] like Figures 20-22 FIG2 is a partial structural diagram of the closing switching mechanism of the third embodiment of the present invention. The difference between this embodiment and the first embodiment is that a driving button 48 is provided on at least one side of the first rod 41, and the driving button 48 is rotatably connected to the side wall of the first rod 41. The switching driving member is a driving tooth 22 provided on at least one side of the actuating rod 2. Figure 21 and Figure 22 As shown, in this embodiment, the drive button 48 is provided on both sides of the first rod 41, and the drive tooth 22 is provided on each side of the actuating rod 2. The drive tooth 22 includes a first side wall 221 and a second side wall 222. The first side wall 221 of the drive tooth 22 is located distally of the second side wall 222. The first side wall 221 of the drive tooth 22 is a vertical surface, and the second side wall 222 of the drive tooth 22 is a guide surface, with the proximal side of the guide surface inclined upward compared to the distal side. In another alternative embodiment, the drive button 48 may be provided on only one side of the first rod 41, and the drive tooth 22 may be provided on one side of the actuating rod 2.

[0117] In this embodiment, the driving button 48 is disposed on the third pivot portion 413, and the first end of the driving button 48 is rotatable distally about the second pin 44. The first rod 41 is further provided with a stopper 415, which is located proximally of the driving button 48 and blocks the proximal movement of the second end of the driving button 48. A torsion spring may be mounted on the second pin 44, which abuts against the driving button 48 and the first rod 41. In other embodiments, the driving button 48 may also be coupled with another type of elastic member 47.

[0118] The principle of stapler closure in the third embodiment is the same as that in the first embodiment. During the firing process of the stapler, when the drive tooth 22 moves from the proximal side of the drive button 46 to the distal side, the drive tooth 22 drives the first end of the drive button 46 to rotate toward the distal side so as not to block the movement of the drive tooth 22 toward the distal side, and the torsion spring undergoes elastic deformation. After the stapler is fired, the retraction rod 7 is pulled, so that the driving tooth 22 moves toward the proximal side along with the actuating rod 2, and the driving tooth 22 acts on the driving button 46, and the driving button 46 is blocked by the stop portion 415 and cannot move toward the proximal side. The driving tooth 22 gives the first end of the driving button 46 a force in the direction away from the actuating rod 2, so that the third pivot portion 413 and the fourth pivot portion 423 move in the direction away from the actuating rod 2, and the connecting rod assembly 4 returns to the first state. At the same time, the second pivot portion 422 drives the closing pull tab 12 to move toward the proximal side through the closing rod assembly 5, thereby automatically opening the nail head 9.

[0119] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A closed switching mechanism, characterized in that: Used for a medical stapler, the stapler includes a stapler body, and the closing switching mechanism includes: A connecting rod assembly includes a first rod and a second rod, wherein the second rod is located on the proximal side of the first rod, the first rod includes a first pivot portion and a third pivot portion, the second rod includes a second pivot portion and a fourth pivot portion, the first pivot portion is pivotally connected to the stapler body, and the third pivot portion is pivotally connected to the fourth pivot portion, and the connecting rod assembly includes a first state and a second state; an actuating lever including a switching drive member, the actuating lever including a first position region and a second position region, the second position region being located distally of the first position region; a closing rod assembly and a closing tab, wherein the closing rod assembly is pivotally connected to the second pivot portion, and a proximal end side of the closing tab is fixedly connected to the closing rod assembly; In which, when the connecting rod assembly is in the second state and the actuating rod moves from the second position area to the first position area, the switching drive member presses the connecting rod assembly in the direction away from the actuating rod, so that the connecting rod assembly enters the first state, the third pivot part and the fourth pivot part move in the direction away from the actuating rod, and the second pivot part drives the closing pull tab to move toward the distal side of the anastomosis device through the closing pull rod assembly.

2. The closed switching mechanism according to claim 1, characterized in that: The connecting rod assembly further includes a driving button, the first rod is pivotally connected to the second rod, the driving button is mounted on the first rod or the second rod, and a first end of the driving button protrudes from a side surface of the first rod or the second rod facing the actuating rod; When the connecting rod assembly is in the second state and the actuating rod moves from the second position region to the first position region, the switching driving member presses the first end of the driving button in a direction away from the actuating rod.

3. The closed switching mechanism according to claim 2, characterized in that: The connecting rod assembly is in the second state, and when the actuating rod moves from the first position region to the second position region, the first rod does not rotate relative to the second rod; When the linkage assembly is in the second state and the actuating rod moves from the second position region to the first position region, the first rod pivots relative to the second rod.

4. The closing switching mechanism according to claim 3, characterized in that: When the connecting rod assembly is in the second state and the actuating rod moves from the first position area to the second position area, the switching drive member drives the first end of the driving button to move toward the distal side without blocking the movement of the actuating rod.

5. The closing switching mechanism according to claim 4, characterized in that: A mounting groove is provided on a side surface of the first rod or the second rod facing the actuating rod, and the driving button is mounted in the mounting groove.

6. The closing switching mechanism according to claim 5, characterized in that: The mounting groove includes a first side wall, a second side wall and a bottom wall. The first side wall of the mounting groove is located on the distal side of the second side wall. A first gap is provided between the driving button and the first side wall of the mounting groove. When the connecting rod assembly is in the first state, the driving button is abutted against the second side wall of the mounting groove. When the connecting rod assembly is in the second state and the actuating rod moves from the first position area to the second position area, the driving button moves toward the first side wall of the mounting groove.

7. The closing switching mechanism according to claim 6, characterized in that: The connecting rod assembly also includes an elastic member, which is installed between the driving button and the first side wall so that the driving button tends to approach the second side wall. When the driving button moves toward the first side wall, the driving button compresses the elastic member to cause elastic deformation.

8. The closing switching mechanism according to claim 7, characterized in that: The elastic member is a spring sheet, the first end of which is connected to the side of the driving button facing the second side wall of the mounting slot, the second end of the spring sheet is provided with a bending portion, the second side wall of the mounting slot is provided with a stop slot, and the bending portion of the spring sheet enters the stop slot.

9. The closing switching mechanism according to claim 6, characterized in that: The second end of the driving button is pivotally connected to the bottom wall of the mounting slot.

10. The closed switching mechanism according to claim 6, characterized in that: At least part of the outer side wall of the second end of the driving button is a first arc surface, and at least part of the bottom wall of the mounting groove is a second arc surface. The first arc surface fits the second arc surface, and the first arc surface can rotate relative to the second arc surface.

11. The closing switching mechanism according to claim 5, characterized in that: The switching driving member is a rack arranged on a side of the actuating rod facing the connecting rod assembly.

12. The closing switching mechanism according to claim 3, characterized in that: A driving button is provided on at least one side of the first rod, and the driving button is rotatably connected to the side wall of the first rod. The switching driving member is a driving tooth provided on at least one side of the actuating rod.

13. The closing switching mechanism according to claim 12, characterized in that: The first rod is further provided with a stop portion, which is located on the proximal side of the driving button and blocks the movement of the second end of the driving button toward the proximal side.

14. The closing switching mechanism according to claim 12, characterized in that: The third pivoting portion is pivotally connected to the fourth pivoting portion via a pin shaft. The driving button is disposed on the third pivoting portion, and the first end of the driving button can rotate toward the distal side around the pin shaft.

15. The closing switching mechanism according to claim 12, characterized in that: The driving tooth includes a first side wall and a second side wall. The first side wall of the driving tooth is located at the distal end of the second side wall. The first side wall of the driving tooth is a vertical surface, and the second side wall of the driving tooth is a guiding surface.

16. The closing switching mechanism according to claim 1, characterized in that: Also included is a firing handle, the firing handle including a first mating portion, and the connecting rod assembly further including a second mating portion; When the connecting rod assembly is in the first state and the firing handle rotates in the first direction, the first mating portion drives the connecting rod assembly to enter the second state through the second mating portion, the third pivot portion and the fourth pivot portion move toward the direction approaching the actuating rod, and the second pivot 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.

17. The closing switching mechanism according to claim 16, characterized in that: When the connecting rod assembly is in the first state and the firing handle rotates along the first direction, the first matching portion drives the first rod to rotate along the first direction through the second matching portion, and the second rod rotates along 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.

18. The closing switching mechanism according to claim 16, characterized in that: When the connecting rod assembly is in the first state, the second matching portion abuts against the first matching portion.

19. The closing switching mechanism according to claim 17, 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.

20. The closing switching mechanism according to claim 1, characterized in that: It also includes a connecting rod, and the closing pull rod assembly includes a sleeve portion and a driving portion. The connecting rod extends along the axial direction of the anastomosis device, and the actuating rod and the sleeve portion are both sleeved on the outside of the connecting rod, and the sleeve portion is located on the proximal side of the actuating rod.

21. The closing switching mechanism according to claim 20, 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.

22. A medical stapler, characterized in that: The invention comprises the closing switching mechanism according to any one of claims 1 to 21.

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