Clip applier with transmission mechanism

Abstract

The clip applier with the transmission mechanism comprises a clip head assembly and a device body assembly, the near end of the clip head assembly is connected with the far end of the device body assembly, the clip head assembly comprises a clip head and an outer tube, the outer tube is connected to a ligation clip in a sleeving mode, and the device body assembly comprises an instrument shell, a trigger, the transmission mechanism, a push-pull rod and a reset spring; the trigger is pulled towards the near end, the drive transmission mechanism pushes the push-pull rod to compress the reset spring and enable the push-pull rod to slide towards the far end, and therefore the ligation clamp is controlled to be closed. The trigger is pushed towards the far end, the transmission mechanism is driven to pull the push-pull rod to slide towards the near end, meanwhile, the reset spring is reset, and therefore the ligation clamp is controlled to be opened. The device is simple in structure, good in effect, low in cost and easy in process implementation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a clamping forceps with a transmission mechanism. Background Art

[0002] The invention discloses a disposable continuous ligation clip and a clip applier, which is a continuous clip applier with a pre-installed ligation clip, and relates to the technical field of medical devices.

[0003] At present, the ligation clips used in the market are generally clamped with tools such as clamps or pliers, which is very inconvenient to use. In addition, the stacked ligation clips are easily disturbed during the clamping process, which makes the ligation clips more messy and inconvenient to clamp and use, and the ligation clips are easily spilled, causing contamination.

[0004] Another type of continuous ligation clamp and clamp applier has a movable wrench that is limited by its material and structure. In addition, the force required to push and close the clamp is relatively large, so the teeth may break easily during the elastic deformation process.

[0005] Therefore, it is urgent to develop a clamping forceps that can realize the continuous operation of pushing and clamping and closing clamping. This patent introduces a clamping forceps with a transmission mechanism that can realize the continuous operation of pushing and clamping and closing clamping. Summary of the invention

[0006] The technical problem to be solved by the present invention is to solve the technical problem that the prior art cannot realize the continuous operation of pushing and closing the clamp. To solve the above technical problem, the technical solution provided by the present invention is as follows:

[0007] A clamp applier with a transmission mechanism, comprising a clamp head assembly and a body assembly, wherein the proximal end of the clamp head assembly is connected to the distal end of the body assembly, the clamp head assembly comprises a clamp head and an outer tube, and the outer tube is sleeved on a ligation clamp, characterized in that the body assembly comprises an instrument housing, a trigger, a transmission mechanism, a push-pull rod, and a reset spring;

[0008] Pulling the trigger in the proximal direction drives the transmission mechanism to push the push-pull rod to compress the return spring and make the push-pull rod slide in the distal direction, thereby controlling the ligation clip to close;

[0009] The trigger is pushed in the distal direction, driving the transmission mechanism to pull the push-pull rod to slide in the proximal direction and at the same time reset the reset spring, thereby controlling the ligation clip to open.

[0010] Furthermore, the transmission mechanism includes a pawl, a ratchet, and a torsion spring;

[0011] A pawl positioning pin, a torsion spring positioning pin, and a torsion spring positioning rib are also provided in the housing of the device. The pawl is assembled with the pawl positioning pin so that the pawl can rotate in a circumferential direction on the pawl positioning pin.

[0012] The torsion spring is mounted on the torsion spring positioning pin, one end of the torsion spring abuts against the torsion spring positioning rib plate, and the other end of the torsion spring abuts against the first circular groove of the pawl;

[0013] The ratchet is located at one end of the trigger;

[0014] When the trigger is pushed or pulled, the torsion spring applies force to the pawl, causing the pawl to slide on the ratchet teeth.

[0015] Furthermore, the pawl is an equilateral triangle structure, the center of the pawl is a circular hole, and the pawl is mounted on the pawl positioning pin in the instrument housing through the circular hole, so that the pawl can rotate freely in the circumferential direction.

[0016] Furthermore, the ratchet comprises a ratchet tooth top and a ratchet tooth root, and the equilateral triangle structure of the pawl is rounded, and its sharp corner is rounded, and the roundness of its sharp corner is adapted to the ratchet.

[0017] Furthermore, the torsion spring leg at one end of the torsion spring abuts against the torsion spring positioning rib slot; the other end of the torsion spring is bent twice, and the bending radius of the torsion spring after the second bending is adapted to the first circular groove of the pawl.

[0018] Furthermore, there is a distance between the first bend and the second bend, and the distance is greater than the single side length of the pawl.

[0019] Furthermore, the transmission mechanism also includes a tension spring, a first tension spring positioning pin is provided on the trigger, a second tension spring positioning pin is provided on the body shell, one end of the tension spring is hinged to the first tension spring positioning pin, and the other end of the tension spring is hinged to the second tension spring positioning pin.

[0020] Furthermore, when performing a push-clamp operation, the trigger is pressed to push the push-pull rod toward the distal direction, the torsion spring is compressed and stressed, and the pawl rotates to the first ratchet tooth of the ratchet component. At this time, the ligation clamp is completely pushed to the first position of the jaws; the trigger is continued to be pressed, and the pawl slides over the ratchet teeth of the ratchet component respectively. When the pawl is in meshing state with the last tooth of the ratchet component, the ligation clamp reaches the second position of the jaws, completing the push-clamp operation.

[0021] Furthermore, when performing a clamping operation, the trigger is continuously pressed, the torsion spring continues to be compressed, the pawl is completely disengaged from the ratchet of the ratchet component, the pawl rebounds to an initial state, and slides along the buffer zone of the ratchet component, the trigger is closed and rotated to a final position, and the ligation clamp completes the clamping operation at the third position of the jaws.

[0022] Furthermore, when performing a resetting operation, the trigger is released, and the pawl cooperates with the ratchet to reset the push-pull rod toward the proximal direction, thereby completing the resetting of the pawl.

[0023] After adopting such a design, the present invention has at least the following advantages:

[0024] (1) The present invention utilizes a mechanical structure to avoid misoperation by doctors during surgery, and designs such a reliable mechanical structure to improve the stability, reliability, and safety of the instrument's function and operation.

[0025] (2) The present invention has a simple structure, good effect, low cost and easy process implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Figure 1 is a schematic diagram of an initial state of a clip applier according to an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of a pushing and clamping process according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the completion of pushing and clamping according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the completion of clamping according to an embodiment of the present invention;

[0031] Figure 5A is a schematic diagram of the initial position of the body assembly of one embodiment of the present invention;

[0032] Figure 5B is a partially enlarged schematic diagram of the initial position of the body assembly of one embodiment of the present invention;

[0033] Figure 5C This is an embodiment of the present invention Figure 5B A partial enlarged schematic diagram;

[0034] Figure 6 is a schematic diagram of the initial position of a clamp head assembly according to an embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of a pawl structure according to an embodiment of the present invention;

[0036] Figure 8 is a schematic diagram of the structure of a torsion spring according to an embodiment of the present invention;

[0037] Fig. 9A It is a schematic diagram of the position of the body assembly of one embodiment of the present invention from the initial position to the push-clamp state 1;

[0038] Fig. 9B It is a partial enlarged schematic diagram of the body assembly of one embodiment of the present invention reaching the push-clamp state 1 from the initial position;

[0039] Fig.10 It is a schematic diagram of the jaw assembly of one embodiment of the present invention reaching the push clamping state 1 from the initial position;

[0040] Fig.11A It is a schematic diagram of a body assembly of an embodiment of the present invention moving from a push-clamp state 1 position to a push-clamp state 2 position;

[0041] Fig. 11B It is a partial enlarged schematic diagram of a body assembly of an embodiment of the present invention moving from a push-clamp state 1 position to a push-clamp state 2 position;

[0042] Fig.12 It is a schematic diagram of the jaw assembly of one embodiment of the present invention moving from the push-clamp state 1 position to the push-clamp state 2 position;

[0043] Fig.13A It is a schematic diagram of the body assembly of one embodiment of the present invention reaching the locked ligation clamp 3 position from the clamping state 2 position;

[0044] Fig. 13B It is a partial enlarged schematic diagram of the body assembly of one embodiment of the present invention reaching the locked ligation clamp 3 position from the clamping state 2 position;

[0045] Fig.14 It is a schematic diagram of the jaw assembly of one embodiment of the present invention reaching the locked ligation clamp 3 position from the clamping push state 2 position;

[0046] Fig.15 is a schematic diagram of the structure after reset of an embodiment of the present invention;

[0047] Reference numerals,

[0048] Clamp head assembly 1, body assembly 2, clamp head 11, outer tube 12, ligation clamp 13,

[0049] The device housing 22, the limiting rib plate 222, the trigger 23, the transmission mechanism 24, the push-pull rod 25, the return spring 26,

[0050] Ratchet 211, pawl 241, torsion spring 242, limiting rib plate 222, pawl positioning pin 223, torsion spring positioning pin 224, torsion spring positioning rib plate 225, circular hole 2411, first circular groove 2412, pawl fillet 2413, torsion spring support foot 2421, first bend 2422, second bend 2423, torsion spring positioning plate rib plate card slot position 2424, anti-pawl reverse position 2425, ratchet tooth top 2111, ratchet tooth root 2112, jaw first position 111, jaw second position 112, jaw third position 113, sliding part 213, first sliding part position 2131, second sliding part position 2132, tension spring 243, first tension spring positioning pin 212, second tension spring positioning pin 221; DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In this document, “upper”, “lower”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0053] In the following, the end of each component close to the operator is defined as the proximal end, and the end away from the operator is defined as the distal end. The expressions of the proximal end and the distal end are only used to make the description simple and clear, and should not be understood as any limitation to the present invention.

[0054] like Figure 1-15 As shown, an embodiment of the present invention discloses a clip applier with a transmission mechanism, comprising a clamp head assembly 1 and a body assembly 2, wherein the proximal end of the clamp head assembly 1 is connected to the distal end of the body assembly 2, the clamp head assembly 1 comprises a clamp head 11 and an outer tube 12, the outer tube 12 is sleeved on a ligation clip 13, and the body assembly 2 comprises an instrument housing 22, a trigger 23, a transmission mechanism 24, a push-pull rod 25, and a reset spring 26;

[0055] Pull the trigger 23 in the proximal direction, drive the transmission mechanism 24 to push the push-pull rod 25 to compress the return spring 26 and make the push-pull rod 25 slide in the distal direction, thereby controlling the ligation clip 13 to close;

[0056] The trigger 23 is pushed in the distal direction, and the driving transmission mechanism 24 pulls the push-pull rod 25 to slide in the proximal direction and resets the reset spring 26 at the same time, thereby controlling the ligation clip to open.

[0057] Here, the transmission mechanism 24 includes a pawl 241, a torsion spring 242, and a ratchet 211;

[0058] The ratchet 211 is located at one end of the trigger 23;

[0059] A ratchet locating pin 223, a torsion spring locating pin 224, and a torsion spring locating rib 225 are provided in the instrument housing 22. The ratchet 241 is assembled with the ratchet locating pin 223, so that the ratchet 241 can rotate in a circumferential direction on the ratchet locating pin 223.

[0060] The torsion spring 242 is mounted on the torsion spring positioning pin 224, and the torsion spring leg 2421 at one end of the torsion spring 242 abuts against the torsion spring positioning rib 225.

[0061] Specifically, a torsion spring positioning rib plate slot is provided on the torsion spring positioning rib plate 225, and the torsion spring leg 2421 abuts against the torsion spring positioning rib plate slot position to fix and prevent the pawl 241 from tilting during movement and preventing the pawl 241 from reversing.

[0062] The other end of the torsion spring 242 is against the pawl positioning table. Specifically, the other end of the torsion spring 242 is bent twice. After the second bending, the rounded corner of the torsion spring 242 is matched with the pawl 241. One side of the pawl 241 is provided with a first circular groove 2412 that is matched with the bent rounded corner of the torsion spring 242. After the second bending, the rounded corner of the torsion spring 242 is against the first circular groove 2412; the groove shape of the first circular groove 2412 is designed to imitate the bent rounded corner of the torsion spring 242. This design is adopted to make the torsion spring 242 and the pawl 241 bear the force more smoothly, so as to ensure that the transmission mechanism will not slip or skew during operation.

[0063] It is worth mentioning that there is a distance between the first bending and the second bending. The distance and the bending angle must ensure that after the torsion spring 242 and the pawl 241 are assembled, the pawl will be forced to reverse during the pushing and closing operations. The reversal angle of the pawl 241 must be compatible and limited with the bending angle of the torsion spring 242, that is, the anti-reversal position of the pawl must be able to limit the reversal force received by the pawl, thereby ensuring that the pawl can accurately rotate and be subjected to force in the specified direction during the operation of the mechanism.

[0064] The design of the first circular groove 2412 in the embodiment of the present invention can well position the torsion spring 242, preventing the torsion spring 242 from being skewed, unhooked, and other problems during the operation of the transmission mechanism. After assembly, the torsion spring 242 will be subjected to a certain continuous torque, which can position and reset the pawl 241.

[0065] Here, in order to stabilize the pawl 241, the inventor designs the pawl 241 to be an equilateral triangle structure, the center of the pawl 241 is a circular hole 2411, and the pawl 241 is mounted on the pawl positioning pin 223 in the instrument housing 22 through the circular hole 2411, so that the pawl 241 can rotate freely in the circumferential direction;

[0066] It should be noted that during the assembly process, the shaft hole must have a certain clearance so that the pawl 241 can rotate freely in the circumferential direction after assembly;

[0067] The ratchet pawl 241 of the embodiment of the present invention adopts a triangular structure, which is the most stable to ensure that the motion mechanism operates stably.

[0068] Furthermore, the three ratchet corners of the pawl 241 are designed with smooth rounded corners, and the sharp corners are rounded. The roundness of the sharp corners is adapted to the ratchet part of the trigger, so as to cooperate with the ratchet tooth top 2111 and the ratchet tooth root 2112 of the ratchet 211 on the trigger 23. During the push-and-clamp operation, the pawl 241 and the ratchet tooth 211 slide smoothly in cooperation, and a clear "click-click-click" sound is emitted when the teeth slide relative to each other. The reverse locking is accurate, and a larger reverse locking force can be provided.

[0069] In the initial state, one end of the torsion spring 242 contacts the first circular groove 2412 of the pawl 241 , and the pawl 241 does not contact the trigger ratchet portion.

[0070] The clamping operation process of the clamp applicator according to the embodiment of the present invention is as follows:

[0071] When performing a push-clamp operation, the trigger 23 is pressed to rotate counterclockwise in a circular direction around the circular fixed column on the instrument housing 22. When the trigger table 232 leaves the table of the limiting rib plate 222, the circular table of the trigger contacts the circular table of the push-pull rod 25 and moves the push-pull rod 25 toward the distal direction. The push-pull rod moves toward the distal direction, so that the ligation clamp 13 in the outer tube 12 reaches the first jaw position 111.

[0072] Since the return spring 26 is against the surface of the push-pull rod 25, when the push-pull rod 25 moves toward the distal end, the return spring 26 is compressed and stressed.

[0073] Here, the push-pull rod 25 is contoured to match the circular design of the trigger table, converting the rotational motion of the trigger 23 into the linear motion of the push-pull rod.

[0074] Specifically, when the trigger 23 is closed and rotated, the torsion spring 242 applies a torque to the pawl 241, so that the rounded corner of the pawl 241 abuts against the root of the trigger ratchet, and when the pawl 241 abuts against the first tooth of the trigger ratchet, a "click" sound can be clearly heard. This allows the operator to clearly know that the instrument is in the state of the push-clamp operation.

[0075] The torsion force applied by the torsion spring 242 to the pawl 241 keeps the pawl 241 in the meshing state at all times. At this time, the transmission mechanism can achieve a self-locking effect, that is, when the trigger 23 is released at this time, the trigger 23 can maintain the closed state and will not return to the initial position.

[0076] Continue to press the trigger 23, so that the trigger 23 rotates and the push-pull rod 25 continues to move toward the distal end. The reset spring 26 continues to be compressed and stressed. After the trigger 23 inside the instrument housing 22 is closed and rotated, the pawl 241 in the transmission mechanism has slid over the ratchet part and has now rested on the first slide part position 2131 of the slide part 213. At this time, the push-pull rod continues to move forward, so that the ligation clamp in the outer tube reaches the second jaw position 112. At this time, the ligation clamp 13 has reached the final position of the jaw, which indicates that the push-pull operation is completed. If the trigger is released at this time, the pawl 241 will now contact the root of the last tooth of the ratchet part and achieve reverse locking.

[0077] Here, the bent corner of the torsion spring 242 is matched with the first circular groove set on the surface of the pawl 241, so that the pawl 241 will not flip after being subjected to the torque of the torsion spring 242, so that the angle of the pawl 241 is always maintained at the accurate position, thereby ensuring that the pawl 241 is in place with the tooth root.

[0078] It should be noted that the installation positions of the torsion spring 242 and the pawl 241 should be set at appropriate positions to ensure that the pawl 241 can reliably reverse lock the trigger when it reaches each root position of the trigger ratchet part, and the force it can withstand is much greater than the reset force of the reset spring. The purpose of the motion structure design is to prevent the trigger from reversing in the reverse direction due to the reset force of the reset spring during the push-clamp operation, which will affect the displacement, falling, skewing and other problems of the jaw ligation clamp.

[0079] The instrument clamping operation process is as follows:

[0080] The trigger 23 is continuously pressed to rotate the trigger 23 and move the push-pull rod 25 forward, and the return spring 26 continues to be compressed and stressed.

[0081] At the same time, after the trigger 23 in the instrument housing 22 is closed and rotated, the pawl 241 in the transmission mechanism slides with the surface of the sliding part and passes through the second sliding part position 2132. At this time, the pawl 241 is completely separated from the trigger 23, and the pawl 241 is only subjected to the torsion force of the torsion spring 242, which resets the pawl. At this time, the trigger 23 has been closed and rotated to the final position. During the process of the trigger 23 closing and rotating, the push-pull rod 25 continues to be advanced forward, and the reset spring 26 is further compressed.

[0082] The push-pull rod 25 continues to move forward and drives the outer tube to move forward together, so that the ligation clamp at the third position of the jaws completes the clamping operation.

[0083] Here, when the pawl 241 slides from the first slide position 2131 to the second slide position 2132, the torsion spring 242 arranged on the side presses against the end face of the pawl 241 to always force it, ensuring that the pawl 241 will not flip over during the sliding process. When the pawl flips to a certain angle, the first bending angle of the torsion spring will counteract it, so that the pawl will not continue to flip over, thereby playing the role of angle limiting. In addition, the arrangement of the rib plate on the instrument housing can increase the strength of the housing, and can also reliably and accurately position the parts in the transmission mechanism.

[0084] Here, the inventor sets the arc surface from the first sliding portion position to the second sliding portion position in order to ensure that the pawl can be returned to the position for the push-clamp operation at any time.

[0085] Furthermore, the transmission mechanism 24 also includes a tension spring 243, a first tension spring positioning pin 212 is provided on the trigger 23, a second tension spring positioning pin 221 is provided on the body shell 22, one end of the tension spring 243 is hinged to the first tension spring positioning pin 212, and the other end of the tension spring 243 is hinged to the second tension spring positioning pin 221.

[0086] A trigger table is also provided on the trigger 23, and a limiting rib plate 222 is also provided on the instrument housing 22; when the tension spring 243 is in a stretched state, the trigger table will always be pressed against the limiting rib plate 222 on the instrument housing 22.

[0087] The limiting rib plate 222 here has a limiting effect on the trigger 23, and the tension spring 243 has a continuous resetting effect on the trigger 23.

[0088] After the instrument completes the clamping operation, the trigger is released, and the reset spring resets the push-pull rod backward, thereby driving the trigger to reset together.

[0089] Specifically, the tension spring 243 at the bottom pulls the trigger back onto the limiting rib plate 222, that is, the trigger table is in contact with the limiting rib plate, and the pawl retreats to complete the reset of the pawl ratchet teeth.

[0090] At the same time, the push-pull rod resets and drives the front clamp head assembly to reset back to the initial state. At this time, the ligation clamp that has completed the locking in the previous step has completed the closing operation on the tubular tissue, such as the vascular tissue structure, and remains in the body. The entire instrument has been reset and returned to the initial position, waiting for the next cycle of operation.

[0091] The transmission mechanism of the present invention is provided with a tension spring and a torsion spring. The function of the tension spring is to ensure that after the push-pull rod and the trigger return to their original positions together, the trigger is inside the instrument housing and before the trigger table contacts the limiting rib plate table, there is still a free rotation stroke. The tension spring is provided to compensate for this rotation stroke of the trigger. On the one hand, it makes the transmission structure more accurate and reliable, and on the other hand, it can also improve the opening and closing feel during operation. In addition, the torsion spring can make the pawl force balanced and reset accurately.

[0092] It should be noted that the reset spring force should be greater than the tension spring force, and the tension spring force should be greater than the torsion spring force, so as to meet the continuous linkage of the mechanical movement function of the instrument and compensate for the loss between mechanical parts.

[0093] After adopting such a design, the present invention has at least the following advantages:

[0094] (1) The push-and-clamp operation process of the present invention can be stopped at any time by closing the trigger, so that the doctor can adjust the relative position of the instrument and the tissue at any time, thereby improving the quality of the operation.

[0095] (2) The present invention has a simple structure, good effect, low cost and easy process implementation.

[0096] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the invention disclosed in the specification and examples. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in the present invention. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0097] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A clip applier with a transmission mechanism, comprising a clamp head assembly and a body assembly, wherein the proximal end of the clamp head assembly is connected to the distal end of the body assembly, the clamp head assembly comprises a clamp head and an outer tube, and the outer tube is sleeved on a ligation clip, characterized in that: The instrument body assembly includes an instrument housing, a trigger, a transmission mechanism, a push-pull rod, and a return spring; Pulling the trigger in the proximal direction drives the transmission mechanism to push the push-pull rod to compress the return spring and make the push-pull rod slide in the distal direction, thereby controlling the ligation clip to close; The trigger is pushed in the distal direction, driving the transmission mechanism to pull the push-pull rod to slide in the proximal direction and at the same time reset the reset spring, thereby controlling the ligation clip to open.

2. A clip applier with a transmission mechanism as claimed in claim 1, characterized in that: The transmission mechanism includes a pawl, a ratchet and a torsion spring; A pawl positioning pin, a torsion spring positioning pin, and a torsion spring positioning rib are also provided in the housing of the device. The pawl is assembled with the pawl positioning pin so that the pawl can rotate in a circumferential direction on the pawl positioning pin. The torsion spring is mounted on the torsion spring positioning pin, one end of the torsion spring abuts against the torsion spring positioning rib plate, and the other end of the torsion spring abuts against the first circular groove of the pawl; The ratchet is located at one end of the trigger; When the trigger is pushed or pulled, the torsion spring applies force to the pawl, causing the pawl to slide on the ratchet teeth.

3. A clip applier with a transmission mechanism as claimed in claim 2, characterized in that: The pawl is an equilateral triangle structure, and the center of the pawl is a circular hole. The pawl is mounted on the pawl positioning pin in the instrument housing through the circular hole, so that the pawl can rotate freely in the circumferential direction.

4. A clip applier with a transmission mechanism as claimed in claim 3, characterized in that: The ratchet comprises a ratchet tooth top and a ratchet tooth root. The equilateral triangle structure of the pawl is rounded, and its sharp corner is rounded, and the roundness of its sharp corner is adapted to the ratchet.

5. A clip applier with a transmission mechanism as claimed in claim 4, characterized in that: The torsion spring leg at one end of the torsion spring abuts against the torsion spring positioning rib plate slot; the other end of the torsion spring is bent twice, and the bending radius of the torsion spring after the second bending is adapted to the first circular groove of the pawl.

6. A clip applier with a transmission mechanism as claimed in claim 5, characterized in that: There is a distance between the first bend and the second bend, and the distance is greater than the single side length of the pawl.

7. A clip applier with a transmission mechanism as claimed in claim 6, characterized in that: The transmission mechanism also includes a tension spring, a first tension spring positioning pin is provided on the trigger, a second tension spring positioning pin is provided on the body shell, one end of the tension spring is hinged to the first tension spring positioning pin, and the other end of the tension spring is hinged to the second tension spring positioning pin.

8. A clip applier with a transmission mechanism as claimed in claim 7, characterized in that: When performing a push-and-clamp operation, the trigger is pressed to push the push-pull rod toward the distal direction, the torsion spring is compressed and the pawl rotates to the first ratchet tooth of the ratchet component. At this time, the ligation clamp is completely pushed to the first position of the jaws; the trigger is continued to be pressed, and the pawl slides over the ratchet teeth of the ratchet component respectively. When the pawl is in meshing state with the last tooth of the ratchet component, the ligation clamp reaches the second position of the jaws, completing the push-and-clamp operation.

9. A clip applier with a transmission mechanism as claimed in claim 8, characterized in that: When performing the clamping operation, the trigger is continuously pressed, the torsion spring continues to be compressed, the pawl is completely disengaged from the ratchet of the ratchet component, the pawl rebounds to the initial state, and slides along the buffer zone of the ratchet component, and the trigger is closed and rotated to the final position, so that the ligation clamp completes the clamping operation at the third position of the jaws.

10. A clip applier with a transmission mechanism as claimed in claim 9, characterized in that: When performing a resetting operation, the trigger is released, and the pawl cooperates with the ratchet teeth to reset the push-pull rod toward the proximal direction, thereby completing the resetting of the pawl.

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