Clip applier with transmission mechanism
By introducing a transmission mechanism into the clamping clamp and utilizing the mechanical structure of pawls, ratchet teeth, and torsion springs, the continuous operation of pushing and closing the clamp is achieved, solving the problems of discontinuous operation and easy breakage in the existing technology, and improving the stability and safety of the instrument.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- B J ZH F PANTHER MEDICAL EQUIP
- Filing Date
- 2024-12-30
- Publication Date
- 2026-05-05
AI Technical Summary
In existing technologies, the pushing and closing operations of ligation clips are not continuous, which can easily lead to tooth breakage and excessive operating force. Furthermore, the process of taking them out is inconvenient, resulting in messy or contaminated ligation clips.
Design a clamp with a transmission mechanism, including a clamp head assembly and a clamp body assembly. Utilize a mechanical structure of pawls, ratchet teeth, torsion springs, and return springs to achieve continuous operation of pushing and closing the clamp. The rotational motion of the trigger is converted into the linear motion of the push-pull rod to ensure reliable closing and opening of the ligation clamp.
It achieves continuity and stability in pushing and closing clamping operations, avoids misoperation, improves the functional reliability and safety of the instrument, and has a simple structure and low cost.
Smart Images
Figure CN224193533U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a clamp with a transmission mechanism. Background Technology
[0002] A disposable multi-shot ligation clip and a multi-shot clamp with a pre-loaded ligation clip, relating to the field of medical device technology.
[0003] Currently, ligation clips on the market are typically handled using tools like clamps or pliers, which is quite inconvenient. Furthermore, the process of handling them can easily disrupt the stack of clips, making them more cluttered and difficult to use, and also causing them to spill and become contaminated.
[0004] Another type of continuous ligation clamp and clamping pliers has a wrench that is limited by the material and structure of the material. In addition, the force required to push and close the clamp is relatively large, which can easily cause the teeth to break during the elastic deformation process.
[0005] Therefore, it is urgent to develop a clamping pliers that can perform push-clamp and close-clamp operations in a continuous manner. This patent introduces a clamping pliers with a transmission mechanism that can achieve push-clamp and close-clamp operations in a continuous manner. Utility Model Content
[0006] The technical problem this utility model aims to solve is to address the inability of existing technologies to achieve continuous pushing and closing clamping operations. To solve the above technical problem, this utility model provides the following technical solution:
[0007] A clamp with a transmission mechanism includes 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 includes a clamp head and an outer tube, the outer tube being sleeved on the ligation clamp, characterized in that the body assembly includes an instrument housing, a trigger, a transmission mechanism, a push-pull rod, and a return spring.
[0008] Pulling the trigger towards the proximal end drives the transmission mechanism to push the push-pull rod to compress the return spring and slide the push-pull rod towards the distal end, thereby controlling the closure of the ligation clip;
[0009] Pushing the trigger towards the distal end drives the transmission mechanism to pull the push-pull rod towards the proximal end, simultaneously resetting the reset spring, thereby controlling the opening of the ligation clip.
[0010] Furthermore, the transmission mechanism includes a pawl, a ratchet tooth, and a torsion spring;
[0011] The instrument housing is also provided with a pawl positioning pin, a torsion spring positioning pin, and a torsion spring positioning rib. The pawl is fitted with the pawl positioning pin so that the pawl can rotate circumferentially on the pawl positioning pin.
[0012] The torsion spring is mounted on the torsion spring positioning pin, with one end of the torsion spring abutting against the torsion spring positioning rib plate and the other end of the torsion spring abutting 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 has an equilateral triangular shape and a circular hole at its center. The pawl is fitted onto the pawl positioning pin inside the instrument housing through the circular hole, allowing the pawl to rotate freely in the circumferential direction.
[0016] Furthermore, the ratchet includes a ratchet tooth tip and a ratchet tooth root, and the equilateral triangular structure of the pawl has rounded corners, with its sharp corners rounded, and the roundness of its sharp corners is adapted to the ratchet tooth.
[0017] Furthermore, the torsion spring support foot at one end of the torsion spring abuts against the slot of the torsion spring positioning rib plate; the other end of the torsion spring is bent twice, and the rounded corner of the second bend of the torsion spring 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 length of one side of the pawl.
[0019] Furthermore, the transmission mechanism also includes a tension spring, the trigger is provided with a first tension spring positioning pin, the body housing is provided with a second tension spring positioning pin, 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 the clamping operation, pressing the trigger moves the push-pull rod towards the distal end, compressing the torsion spring and causing the pawl to rotate onto the first ratchet tooth of the ratchet component. At this point, the ligation clamp is fully pushed to the first position of the jaws. Continuing to press the trigger, the pawl slides past the ratchet teeth of the ratchet component. When the pawl is engaged with the last tooth of the ratchet component, the ligation clamp reaches the second position of the jaws, completing the clamping operation.
[0021] Furthermore, when performing the clamping operation, the trigger is pressed continuously, the torsion spring continues to be compressed and stressed, the pawl completely disengages from the ratchet of the ratchet component, the pawl springs back to its initial state and slides along the buffer zone of the ratchet component, the trigger closes and rotates to the final position, so that the ligation clamp completes the clamping operation at the third position of the jaws.
[0022] Furthermore, when performing a reset operation, releasing the trigger causes the pawl to engage with the ratchet teeth, causing the push-pull rod to reset towards the proximal end, thereby completing the reset of the pawl.
[0023] With this design, the present invention has at least the following advantages:
[0024] (1) This utility model utilizes a mechanical structure to avoid doctors’ misoperation during the operation. This reliable mechanical structure is designed to improve the stability, reliability and safety of instrument function and operation.
[0025] (2) This utility model has a simple structure, good effect, low cost and easy process implementation. Attached Figure Description
[0026] The above is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, the following describes this utility model in further detail with reference to the accompanying drawings and specific embodiments.
[0027] Figure 1 This is a schematic diagram of the initial state of the clamping forceps according to an embodiment of the present invention;
[0028] Figure 2 This is a schematic diagram of the pushing and clamping process according to an embodiment of the present invention;
[0029] Figure 3 This is a schematic diagram of the completed push clamp according to an embodiment of the present invention;
[0030] Figure 4 This is a schematic diagram of the clamping process completed according to an embodiment of the present invention;
[0031] Figure 5A This is a schematic diagram of the initial position of the body assembly according to an embodiment of the present invention;
[0032] Figure 5B This is a partially enlarged schematic diagram of the initial position of the body assembly according to an embodiment of the present invention;
[0033] Figure 5C This is an embodiment of the present utility model. Figure 5B Enlarged view of a portion;
[0034] Figure 6 This is a schematic diagram of the initial position of the clamp head assembly according to an embodiment of the present invention;
[0035] Figure 7 This is a schematic diagram of a ratchet structure according to an embodiment of the present invention;
[0036] Figure 8 This is a schematic diagram of a torsion spring structure according to an embodiment of the present invention;
[0037] Figure 9A This is a schematic diagram of the device body assembly of an embodiment of the present invention from the initial position to the push clamp state 1 position;
[0038] Figure 9B This is a partially enlarged schematic diagram of the body assembly of an embodiment of the present invention from the initial position to the push-clamp state 1 position;
[0039] Figure 10 This is a schematic diagram of the jaw assembly of an embodiment of the present invention moving from the initial position to the push-clamp state 1 position;
[0040] Figure 11A This is a schematic diagram of the device body assembly of an embodiment of the present invention moving from the push-clamp state 1 position to the push-clamp state 2 position;
[0041] Figure 11B This is a partially enlarged schematic diagram of the body assembly of an embodiment of the present invention, showing the movement from position 1 to position 2.
[0042] Figure 12 This is a schematic diagram of the jaw assembly of an embodiment of the present invention moving from the push-clamp state 1 position to the push-clamp state 2 position;
[0043] Figure 13A This is a schematic diagram of the device body assembly of an embodiment of the present invention moving from the push clamp state 2 position to the locking ligation clamp 3 position;
[0044] Figure 13B This is a partially enlarged schematic diagram of the device body assembly of an embodiment of the present invention from the push clamp state 2 position to the locking ligation clamp 3 position;
[0045] Figure 14 This is a schematic diagram of the jaw assembly of an embodiment of the present invention moving from the push clamp position 2 to the locked ligation clamp position 3;
[0046] Figure 15 This is a schematic diagram of the structure after resetting according to an embodiment of the present invention;
[0047] Figure label,
[0048] Clamping head assembly 1, clamp body assembly 2, clamping head 11, outer tube 12, ligation clip 13
[0049] Instrument housing 22, limiting rib 222, trigger 23, transmission mechanism 24, push-pull rod 25, return spring 26.
[0050] Racket 211, Pad 241, Torsion Spring 242, Limiting Rib 222, Pad Positioning Pin 223, Torsion Spring Positioning Pin 224, Torsion Spring Positioning Rib 225, Circular Hole 2411, First Circular Groove 2412, Pad Round Corner 2413, Torsion Spring Support Leg 2421, First Bending 2422, Second Bending 2423, Torsion Spring Positioning Rib Slot 2424, Anti-Pad Reversal Position 2425, Racket Tooth Top 2111, Racket 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 Implementation
[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0052] In this article, "up" and "down" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.
[0053] In the following description, the end of each component closer to the operator is defined as the proximal end, and the end farther from the operator is defined as the distal end. These terms "proximal end" and "distal end" are used only for simplicity and clarity and should not be construed as limiting the scope of this invention.
[0054] like Figure 1-15 As shown, an embodiment of the present invention discloses a clamp with a transmission mechanism, including a clamp head assembly 1 and a body assembly 2. 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 includes a clamp head 11 and an outer tube 12, which is sleeved on the ligation clamp 13. The body assembly 2 includes an instrument housing 22, a trigger 23, a transmission mechanism 24, a push-pull rod 25, and a return spring 26.
[0055] Pulling the trigger 23 towards the proximal end drives the transmission mechanism 24 to push the push-pull rod 25 to compress the return spring 26 and slide the push-pull rod 25 towards the distal end, thereby controlling the closure of the ligation clip 13;
[0056] Pushing the trigger 23 towards the distal end drives the transmission mechanism 24 to pull the push-pull rod 25 towards the proximal end, simultaneously resetting the return spring 26, thereby controlling the opening of the ligation clip.
[0057] Here, the transmission mechanism 24 includes a pawl 241, a torsion spring 242, and a ratchet 211;
[0058] Ratchet 211 is located at one end of trigger 23;
[0059] The instrument housing 22 is provided with a pawl positioning pin 223, a torsion spring positioning pin 224, and a torsion spring positioning rib 225. The pawl 241 is fitted with the pawl positioning pin 223, which allows the pawl 241 to rotate circumferentially on the pawl positioning pin 223.
[0060] The torsion spring 242 is mounted on the torsion spring positioning pin 224, and the torsion spring support leg 2421 at one end of the torsion spring 242 abuts against the torsion spring positioning rib plate 225.
[0061] Specifically, the torsion spring positioning rib plate 225 is provided with a torsion spring positioning rib plate slot, and the torsion spring support leg 2421 abuts against the position of the torsion spring positioning rib plate slot to fix it, prevent it from tilting during the movement, and prevent the pawl 241 from reversing.
[0062] The other end of the torsion spring 242 rests against the pawl positioning table. Specifically, the other end of the torsion spring 242 is bent twice. After the second bend, the rounded corner of the torsion spring 242 matches the pawl 241. A first circular groove 2412 is provided on one side of the pawl 241 to match the rounded corner of the torsion spring 242. After the second bend, the rounded corner of the torsion spring 242 abuts against the first circular groove 2412. The groove shape of the first circular groove 2412 is designed to mimic the rounded corner of the torsion spring 242. This design is adopted to make the torsion spring 242 and the pawl 241 more stable under force, and to ensure that there will be no slippage or skew during the operation of the transmission mechanism.
[0063] It is worth noting that there is a distance between the first and second bends. This distance and the bending angle must ensure that after the torsion spring 242 and pawl 241 are assembled, when the push-clamp and clamp-closing operations are performed, the pawl will be subjected to force and reverse. The reversal angle of the pawl 241 must be matched 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, so as to ensure that the pawl can rotate and be subjected to force accurately in the specified direction during the operation of the mechanism.
[0064] The design of the first circular groove 2412 in this embodiment of the present invention can effectively position the torsion spring 242, preventing the torsion spring 242 from becoming skewed or disengaged during the operation of the transmission mechanism. After assembly, the torsion spring 242 will bear a certain continuous torque, which can play a role in positioning and resetting the pawl 241.
[0065] Here, in order to make the pawl 241 stable, the inventor designed the pawl 241 as an equilateral triangle structure with a circular hole 2411 at the center. The pawl 241 is fitted onto the pawl positioning pin 223 inside 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, there should be a certain clearance between the shaft and the hole to allow the pawl 241 to rotate freely in the circumferential direction after assembly.
[0067] The pawl 241 of this utility model adopts a triangular structure, which is the most stable to ensure that the motion mechanism operates smoothly under force.
[0068] Furthermore, the three pawls of pawl 241 adopt a smooth rounded corner design, with their sharp corners rounded. The roundness of their sharp corners is adapted to the ratchet part of the trigger, which facilitates the engagement with the top 2111 and root 2112 of the ratchet 211 on the trigger 23. During the push-clamp operation, the pawl 241 and the ratchet 211 slide smoothly together, and a clear "click-click-click" sound is emitted when the teeth slide relative to each other. The reverse locking is accurate and can provide a large reverse locking force.
[0069] In the initial state, one end of the torsion spring 242 is in contact with the first circular groove 2412 of the pawl 241, and the pawl 241 will not contact the trigger ratchet.
[0070] The clamping operation process of the clamping pliers in this embodiment of the utility model is as follows:
[0071] When performing the clamping operation, press the trigger 23 to rotate counterclockwise around the circular fixed post 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 to the distal end. The push-pull rod moves to the distal end so that the ligation clamp 13 in the outer tube 12 reaches the first position 111 of the jaws.
[0072] Since the return spring 26 rests against the platform of the push-pull rod 25, when the push-pull rod 25 moves to the far end, the return spring 26 is compressed and subjected to force.
[0073] Here, the push-pull rod 25 is designed to match the circular shape 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 torque to the pawl 241, causing the rounded corner of the pawl 241 to abut against the root of the trigger ratchet. When the pawl 241 abuts against the first tooth of the trigger ratchet, a clear "click" sound can be heard. This allows the operator to clearly understand that the instrument is in the push-clamping operation state.
[0075] The torsion spring 242 applies torque to the pawl 241, keeping the pawl 241 in an engaged state. At this time, the transmission mechanism can achieve a self-locking function, that is, when the trigger 23 is released, the trigger 23 can remain in the closed state and will not return to the initial position.
[0076] Continue pressing trigger 23 to rotate it, which in turn moves push-pull rod 25 further distally. Return spring 26 continues to compress, and after trigger 23 closes and rotates inside instrument housing 22, pawl 241 in the transmission mechanism has slid past the ratchet and is now abutting at the first sliding position 2131 of sliding section 213. At this point, push-pull rod continues to move forward, causing the ligation clamp inside the outer tube to reach the second jaw position 112. The ligation clamp 13 has now reached the final jaw position, marking the end of the clamping operation. If the trigger is released at this point, pawl 241 contacts the root of the last tooth of the ratchet and achieves reverse locking.
[0077] Here, the rounded corner of the torsion spring 242 matches the first circular groove on the surface of the pawl 241, which prevents the pawl 241 from flipping after being subjected to the torque of the torsion spring 242, thus keeping the angle of the pawl 241 in the accurate position and ensuring that the pawl 241 and the tooth root are properly engaged.
[0078] It should be noted that the torsion spring 242 and the pawl 241 should be installed in appropriate positions to ensure that the pawl 241 can reliably lock the trigger in reverse when it reaches each tooth root position on the trigger ratchet, and the force it can withstand is much greater than the restoring force of the return spring. The purpose of this motion structure design is to prevent the trigger from reversing due to the restoring force of the return spring during the clamping operation, which would affect the jaw clamp and cause problems such as displacement, falling off, or tilting.
[0079] The instrument clamping procedure is as follows.
[0080] Continue pressing the trigger 23 to rotate it, which in turn moves the push-pull rod 25 forward, and the return spring 26 continues to be compressed.
[0081] Meanwhile, after the trigger 23 inside the instrument housing 22 closes and rotates, the pawl 241 in the transmission mechanism slides against the surface of the sliding part and passes through the second sliding part position 2132. At this point, the pawl 241 is completely disengaged from the trigger 23, and the pawl 241 is only subjected to the torque of the torsion spring 242, which resets the pawl. At this time, the trigger 23 has closed and rotated to its final position. During the process of the trigger 23 closing and rotating, the push-pull rod 25 continues to advance forward, further compressing the return spring 26.
[0082] The push-pull rod 25 continues to move forward, thereby driving the outer tube to move forward as well, so that the ligation clamp at the third position of the jaws completes the clamping operation.
[0083] Here, as the pawl 241 slides from the first sliding position 2131 to the second sliding position 2132, a torsion spring 242 positioned to the side constantly presses against the end face of the pawl 241, ensuring that the pawl 241 does not flip during sliding. When the pawl flips to a certain angle, the first bending angle of the torsion spring will counteract it, preventing the pawl from continuing to flip and thus providing an angle limit. Furthermore, the arrangement of stiffening plates on the instrument housing increases the housing's strength and allows for reliable and accurate positioning of components in the transmission mechanism.
[0084] Here, the utility model describes the area from the first sliding part to the second sliding part as an arc surface to ensure that the pawl can retract to the position of 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 on the trigger 23, and a second tension spring positioning pin 221 on the housing 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] The trigger 23 is also provided with a trigger table, and the instrument housing 22 is also provided with a limiting rib plate 222; when the tension spring 243 is in the stretched state, it will keep the trigger table pressed against the limiting rib plate 222 on the instrument housing 22.
[0087] The limiting rib 222 here limits the trigger 23, and the tension spring 243 continuously resets the trigger 23.
[0088] After the instrument completes the clamping operation, releasing the trigger causes the return spring to push the lever back to its original position, which in turn drives the trigger back to its original position.
[0089] Specifically, the tension spring 243 pulls the trigger back onto the limiting rib plate 222, that is, the trigger table surface contacts and fits against the limiting rib plate, and the pawl retracts to complete the reset of the pawl and ratchet.
[0090] Simultaneously, the push-pull rod resets, causing the front clamp assembly to return to its initial state. At this point, the ligation clamp, which had completed the closure in the previous step, has achieved the closure of tubular tissues, such as blood vessels, and remains in the body. The entire instrument has been reset and returned to its initial position, awaiting the next cycle of operation.
[0091] The transmission mechanism in this invention incorporates a tension spring and a torsion spring. The tension spring ensures that after the push-pull rod and trigger retract together, the trigger, within the instrument housing, has a period of free rotation before its platform contacts the limiting rib plate. The tension spring compensates for this rotational travel of the trigger. This makes the transmission structure more precise and reliable, and also improves the opening and closing feel during operation. Furthermore, the torsion spring ensures balanced force on the pawl and accurate reset.
[0092] It should be noted that the set return spring force should be greater than the tension spring force, and the tension spring force should be greater than the torsion spring force. This is to ensure continuous linkage of the mechanical motion function of the device and to compensate for wear and tear between mechanical parts.
[0093] With this design, the present invention has at least the following advantages:
[0094] (1) The operation of this utility model can be stopped and started at any time by closing the trigger, which makes it convenient for doctors to adjust the relative position of the instrument and the tissue at any time and improve the quality of surgery.
[0095] (2) This utility model has a simple structure, good effect, low cost and easy process implementation.
[0096] Those skilled in the art will readily conceive of other embodiments of the present invention upon considering the utility model disclosed in the specification and embodiments. 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 not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.
[0097] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.
Claims
1. A clamping clamp with a transmission mechanism, comprising a clamp head assembly and a clamp body assembly, wherein the proximal end of the clamp head assembly is connected to the distal end of the clamp body assembly, the clamp head assembly includes a clamp head and an outer tube, the outer tube being sleeved on the ligation clamp, characterized in that, The device assembly includes an instrument housing, a trigger, a transmission mechanism, a push-pull rod, and a return spring; pulling the trigger towards the proximal end drives the transmission mechanism to push the push-pull rod to compress the return spring and slide the push-pull rod towards the distal end, thereby controlling the closure of the ligation clip; Pushing the trigger towards the distal end drives the transmission mechanism to pull the push-pull rod towards the proximal end, simultaneously resetting the reset spring, thereby controlling the opening of the ligation clip.
2. A clamping pliers with a transmission mechanism as described in claim 1, characterized in that, The transmission mechanism includes a pawl, a ratchet component, and a torsion spring; the instrument housing also includes a pawl positioning pin, a torsion spring positioning pin, and a torsion spring positioning rib. The pawl is fitted with the pawl positioning pin, allowing the pawl to rotate circumferentially on the pawl positioning pin; the torsion spring is fitted on the torsion spring positioning pin, with one end of the torsion spring abutting against the torsion spring positioning rib and the other end abutting against the first circular groove of the pawl; the ratchet component 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 component.
3. The clamping pliers with a transmission mechanism as described in claim 2, characterized in that, The pawl has an equilateral triangular shape and a circular hole at its center. The pawl is fitted onto the pawl positioning pin inside the instrument housing through the circular hole, allowing the pawl to rotate freely in the circumferential direction.
4. A clamping pliers with a transmission mechanism as described in claim 3, characterized in that, The ratchet component includes multiple ratchet teeth, each ratchet tooth having a top and a root. The equilateral triangular structure of the pawl has rounded corners, with its sharp corners rounded to match the roundness of the ratchet teeth.
5. A clamping pliers with a transmission mechanism as described in claim 4, characterized in that, One end of the torsion spring has a torsion spring support foot abutting against the torsion spring positioning rib slot; the other end of the torsion spring is bent twice, and the rounded corner of the second bend of the torsion spring is adapted to the first circular groove of the pawl.
6. A clamping pliers with a transmission mechanism as described 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 length of one side of the pawl.
7. A clamping pliers with a transmission mechanism as described in claim 6, characterized in that, The transmission mechanism also includes a tension spring. The trigger is provided with a first tension spring positioning pin, and the body housing is provided with a second tension spring positioning pin. 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 clamping pliers with a transmission mechanism as described in claim 7, characterized in that, When performing the clamping operation, pressing the trigger moves the push-pull rod towards the distal end, compressing the torsion spring and causing the pawl to rotate onto the first ratchet tooth of the ratchet component. At this point, the ligation clamp is fully pushed to the first position of the jaws. Continuing to press the trigger, the pawl slides past the ratchet teeth of the ratchet component. When the pawl is engaged with the last tooth of the ratchet component, the ligation clamp reaches the second position of the jaws, completing the clamping operation.
9. A clamping pliers with a transmission mechanism as described in claim 8, characterized in that, When performing the clamping operation, continue pressing the trigger, the torsion spring continues to compress and bear force, the pawl completely disengages from the ratchet of the ratchet component, the pawl springs back to its initial state and slides along the buffer area of the ratchet component, the trigger closes and rotates to the final position, so that the ligation clamp completes the clamping operation at the third position of the jaws.
10. A clamping pliers with a transmission mechanism as described in claim 9, characterized in that, When performing a reset operation, releasing the trigger causes the pawl to engage with the ratchet teeth, causing the push-pull rod to reset towards the proximal end, thereby completing the reset of the pawl.