A clamping assembly and valve repair instrument including the same

Abstract

The present application relates to a kind of clamping assembly and the valve repair instrument comprising it, the clamping assembly includes clamping mechanism and self-locking mechanism, clamping mechanism includes clamping body seat, left clamping arm, right clamping arm and drive gear, clamping body seat distal end is symmetrically provided with support arm, the proximal end of left and right clamping arm is hinged with two support arms and the proximal end of left and right clamping arm is equipped with arc rack, clamping body seat center is rotatably connected with drive gear, drive gear is engaged with two arc racks, drive gear can be driven left and right clamping arm to open or close by arc rack when rotating, self-locking mechanism can make drive gear switch between locking and unlocking two states.The present application has the advantages that, through the transmission of drive gear and arc rack, left and right clamping arm is opened or closed, clamping body structure is simplified, internal and external space is optimized, reverse action can be realized in operation, risk is low, safety is good;With self-locking mechanism, left and right clamping arm clamped in place can stably clamp corresponding tissue and is not easy to fall off.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a clamping assembly and a valve repair device comprising the same. Background Art

[0002] The mitral and tricuspid valves have complex anatomical structures, including leaflets, chordae tendineae, papillary muscles, and annulus, which play an important role in maintaining the function of the left and right ventricles, respectively. Any disease that affects the valves may lead to mitral or tricuspid regurgitation, thereby reducing survival rates. With the aging of the population, the incidence of valvular heart disease is gradually increasing, and with it, the incidence of mitral and tricuspid regurgitation is also showing an increasing trend. A common case of mitral or tricuspid valve regurgitation is valvular regurgitation, and severe valvular regurgitation can cause symptoms such as palpitations, chest tightness, and shortness of breath.

[0003] Currently, mitral or tricuspid regurgitation is primarily treated surgically, with surgical valve repair or replacement considered the standard treatment. These standard procedures require opening the chest, making an incision in the heart, and then suturing the valve or performing a ring contraction to correct the condition. However, these procedures require the use of an artificial heart-lung machine to circulate blood and stop the heart. Consequently, these treatments are invasive, require a long recovery period, and carry high surgical risks and complications, particularly for elderly patients. Therefore, in recent years, a new method for effectively treating the disease has been to deliver a clamping device to the heart valve site through minimally invasive surgery and clamp and fix the calcified valve to reduce the regurgitation problem caused by lax valve closure. However, existing clamping devices often have the following shortcomings: the clamping arm structure is complex, and the middle part is connected to an auxiliary transmission structure such as a support transmission rod. After opening, the support transmission rod occupies additional space and affects the maximum angle that the clamping arm can open; after the clamping arm closes and clamps the valve, the positioning and locking are often achieved by mechanical friction between the transmission components, and there is no special locking mechanism. After a long time, there is a risk that the clamping part will open in the reverse direction and become loose and fall off; during the operation of some clamping devices, the clamping arm can often only move in one direction in the closing direction, and the reverse movement and opening are not easy to perform, which is not conducive to reverse operation during the operation, and the operation requirements are high and the fault tolerance rate is low. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a clamping assembly and a valve repair device comprising the same, aiming to overcome the above-mentioned deficiencies in the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a clamping assembly, which includes a clamping mechanism and a self-locking mechanism, the clamping mechanism includes a clamping body seat, a left clamping arm, a right clamping arm and a driving gear, the distal end of the clamping body seat is symmetrically provided with support arms, the proximal ends of the left clamping arm and the right clamping arm are hinged to the two support arms and the proximal ends of the left clamping arm and the right clamping arm are provided with arc-shaped racks, the center rotation of the clamping body seat is connected to the driving gear, the driving gear is engaged with the two arc-shaped racks, and when the driving gear rotates, the distal ends of the left clamping arm and the right clamping arm can be driven to move away from each other to open or move closer to each other to close through the arc-shaped rack, and the self-locking mechanism enables the driving gear to switch between locked and unlocked states.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, a limit block is provided on each of the opposite sides of the two support arms near the distal end surface. When the left clamp arm and the right clamp arm are rotated to open to the maximum extent and closed to the minimum extent, the ends of the two arc-shaped racks are respectively pressed against the two corresponding limit blocks.

[0008] The advantage of adopting the above-mentioned further structural improvement is that, by setting the limit block, the maximum and minimum angles of the opening and closing of the left and right clamping arms can be better limited, that is, the maximum degree of forward and reverse rotation of the driving gear can be limited.

[0009] Furthermore, the two support arms are correspondingly provided with pin holes, and the proximal end of the left clamp arm is fixed with a first front link and a first rear link, each of which is L-shaped, at intervals in front and back. The proximal end of the right clamp arm is fixed with a second front link and a second rear link, each of which is L-shaped, at intervals in front and back. The proximal ends of the first front link, the first rear link, the second front link and the second rear link are all provided with connecting holes corresponding to the pin holes. After the proximal ends of the first front link and the second front link are fitted together, they are hinged to the support arm through a pin passing through the connecting hole and the pin hole. After the proximal ends of the first rear link and the second rear link are fitted together, they are hinged to the other support arm through a pin passing through the connecting hole and the pin hole.

[0010] The benefit of adopting the above-mentioned further structural improvement is that after the above-mentioned first front and rear connecting rods and second front and rear connecting rods of the left clamping arm and the right clamping arm are staggered and matched, they can better realize articulation with the two support arms, and can make the two clamping arms more stable and strong, and can withstand greater clamping force when clamped.

[0011] Furthermore, the driving gear includes a bevel gear and a rotating shaft, the proximal end of the rotating shaft is coaxially fixedly connected to the large end of the bevel gear, and a first mounting hole is opened in the center of the clamp body seat, which passes through the distal and proximal ends of the clamp body seat. The rotating shaft is installed in the first mounting hole and has only the freedom to rotate along its central axis. The bevel gear is located outside the distal end surface of the clamp body seat and is engaged with the two arc-shaped racks.

[0012] The advantages of adopting the above-mentioned further structural improvement are that the gear transmission can be better realized, the structure is simple, and the controllability is good.

[0013] Furthermore, a polygonal hole is opened in the center of the rotating shaft, and a prismatic rotating handle can extend into the polygonal hole from the proximal end of the clamping body seat. When the rotating handle rotates, the rotating shaft moves accordingly.

[0014] The advantage of adopting the above-mentioned further structural improvement is that it is convenient to cooperate with the prismatic rotating handle to realize the rotation operation of the rotating shaft.

[0015] Furthermore, the self-locking mechanism includes a locking shaft, a locking tongue and a self-locking spring. A second mounting hole is provided on the edge of the clamp body seat, which passes through the proximal and distal ends of the clamp body seat. The second mounting holes are arranged on one side of the first mounting hole in parallel and spaced apart. The locking shaft is installed in the second mounting hole and has only the freedom to move axially along the second mounting hole. The locking tongue is fixed to the distal end of the locking shaft, and the self-locking spring is sleeved on the locking shaft. When the locking shaft is subjected to an external force directed from the proximal end to the distal end, the locking tongue moves toward the distal end and disengages the tooth groove of the bevel gear to unlock. When the external force disappears, the self-locking spring causes the locking tongue to automatically reset and engage in the tooth groove of the bevel gear to lock.

[0016] The advantage of adopting the above-mentioned further structural improvement is that the structure is simple and the automatic locking of the driving gear can be achieved well.

[0017] Furthermore, the lock shaft is composed of a first shaft segment with a polygonal cross-section and a second shaft segment with a circular cross-section. The proximal end of the first shaft segment is coaxially fixedly connected to the distal end of the second shaft segment. The distal end of the first shaft segment is fixedly connected to the lock tongue. The side wall of the second shaft segment near the proximal end is connected to a shaft retaining spring. The self-locking spring is sleeved on the second shaft segment. The second mounting hole includes a polygonal hole segment connected to the distal end face of the clamp body seat and a circular hole segment connected to the proximal end face of the clamp body seat. The diameter of the circular hole segment is larger than the circumscribed circle of the polygonal hole segment. The outer ring of the second shaft segment is provided with a plurality of springs, and the springs are connected to each other by a plurality of springs, and the springs are connected to the tooth groove of the bevel gear by a plurality of springs. The springs are connected to the tooth groove of the bevel gear by a plurality of springs. The springs are connected to the tooth groove of the bevel gear by a plurality of springs.

[0018] The advantage of adopting the above-mentioned further structural improvement is that the structural design is reasonable and simple, and it is better to achieve that the lock shaft has no circumferential degree of freedom but only has a certain degree of freedom in the axial direction, so as to effectively realize unlocking and locking.

[0019] Furthermore, a circular groove is provided on the side wall of the second shaft segment close to the proximal end, and the shaft retaining spring is clamped in the circular groove.

[0020] The advantages of adopting the above-mentioned further structural improvement are that the structure is simple, quick connection between the shaft retaining spring and the second shaft section is achieved, and better positioning in the axial direction is achieved.

[0021] Furthermore, the maximum angle of the left clamp arm and the right clamp arm when opened is 180 degrees, and the minimum angle when closed is 0 degrees. The lengths of the left clamp arm and the right clamp arm are equal and range from 12 to 22 mm.

[0022] The advantage of adopting the above-mentioned further structural improvement is that, according to the ring reduction ratio required for the operation (generally 16%-22%), the clamp arm length can be converted and determined to be between 12-22 mm.

[0023] The present invention also provides a valve repair device, which includes a conveying device, a dissociation device, a control device and the above-mentioned clamping assembly, wherein the dissociation device is used to connect or dissociate with the clamping assembly, the conveying device is connected to the dissociation device, and is used to convey the dissociation device and the clamping assembly to the target position, and the control device is used to control the conveying device and the dissociation device to realize conveying, unlocking, and rotating the driving gear to open or close, lock and dissociate the left clamp arm and the right clamp arm.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention realizes the opening or closing of the left and right clamp arms by rotating relative to the clamp body seat through the transmission of the driving gear and the arc-shaped rack, which simplifies the clamp body structure to the greatest extent, optimizes the internal and external space, and makes the whole more compact; it is simple to operate, has good strength, reliable transmission, and accurate transmission displacement. It can realize reverse action during surgery, has a high fault tolerance rate, reduces the risk during the operation, and has higher safety. It is used to perform clamping repair of the mitral valve or tricuspid valve, with the advantages of less trauma, short recovery period, and less risk during surgery.

[0026] (2) The self-locking mechanism locks the driving gear that has been adjusted into position, so that the left and right clamp arms that are clamped into position can stably clamp the corresponding tissue and are not easy to fall off, thereby ensuring the surgical effect. The self-locking mechanism has a self-locking function after installation, and can effectively self-lock the clamp body by relying on the elastic force of the self-locking spring. It has a simple and reliable structure, is easy to operate, and has reversible operation. It can be repeatedly moved during surgery, which brings great convenience to the surgical operation.

[0027] (3) The opening angle of the left and right clamp arms is between 0 and 180 degrees. The larger the opening angle, the more tissues the clamp body can clamp, so the shrinking effect is better. The clamping assembly has a greater shrinking rate and a better treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 An axonometric view of a clamping assembly provided by the present invention;

[0029] Figure 2 for Figure 1 Exploded view of the clamping assembly shown (relative to Figure 1 The rotating handle is shown more often);

[0030] Figure 3 for Figure 1 A front view of the clamping assembly is shown (the clamping body seat shows the structure inside the first and second mounting holes);

[0031] Figure 4 for Figure 1 or Figure 2 An axonometric view of the self-locking mechanism in the clamping assembly shown;

[0032] Figure 5 for Figure 1 or Figure 2 An axonometric view of the clamp body seat in the clamp assembly shown;

[0033] Figure 6 for Figure 1 or Figure 2 An exploded schematic diagram of the clamping body seat and the self-locking mechanism in the clamping assembly shown;

[0034] Figure 7 for Figure 2 An axonometric view of the left and right clamping arms of the clamping assembly shown;

[0035] Figure 8 for Figure 1 The schematic diagram of the clamping assembly shown is when the left and right clamping arms are opened to the maximum extent and limited by two limit blocks;

[0036] Figure 9 for Figure 8 An axonometric view of the clamping assembly as viewed from the clamp body seat;

[0037] Figure 10 for Figure 9 Schematic diagram of the clip support assembly being delivered to the tricuspid valve of the heart;

[0038] Figure 11 for Figure 9 The diagram shows the clamping assembly clamping and shrinking the heart valve ring.

[0039] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0040] 1. Clamp body seat; 2. Left clamp arm; 3. Right clamp arm; 4. Drive gear; 5. Support arm; 6. Arc-shaped rack; 7. Limit block; 8. Pin hole; 9. Pin; 10. First front link; 11. First rear link; 12. Bevel gear; 13. Rotating shaft; 14. First mounting hole; 15. Rotating handle; 16. Lock shaft; 17. Lock tongue; 18. Self-locking spring; 19. Second mounting hole; 20. First shaft section; 21. Second shaft section; 22. Shaft retaining spring; 23. Circular groove. DETAILED DESCRIPTION

[0041] The principles and features of the present invention are described below with reference to the accompanying drawings and specific embodiments. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0042] In the description of the present invention, if terms indicating directions such as "up", "down", "left", "right", "top", "bottom", "inside" and "outside" are used, the directions or positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0043] like Figures 1 to 11As shown, the present invention provides a clamping assembly, which includes a clamping mechanism and a self-locking mechanism, the clamping mechanism includes a clamping body seat 1, a left clamping arm 2, a right clamping arm 3 and a driving gear 4, the distal end of the clamping body seat 1 is symmetrically provided with a support arm 5, the proximal ends of the left clamping arm 2 and the right clamping arm 3 are hinged to the two support arms 5 and the proximal ends of the left clamping arm 2 and the right clamping arm 3 are provided with an arc-shaped rack 6, the center of the clamping body seat 1 is connected to the driving gear 4, the driving gear 4 is engaged with the two arc-shaped racks 6, and when the driving gear 4 rotates, the distal ends of the left clamping arm 2 and the right clamping arm 3 can be driven to move away from each other to open or move closer to each other to close through the arc-shaped rack 6, and the self-locking mechanism enables the driving gear 4 to switch between locked and unlocked states.

[0044] It should be noted that the clamping assembly has two states: an expanded state and a closed state. The expanded and closed states can each correspond to a locked and unlocked state, that is, it can be locked or unlocked when expanded, and vice versa when closed.

[0045] In one embodiment of the present invention, Figure 8 As shown, a limit block 7 is provided on each of the opposite sides of the two support arms 5 near the distal end surface. When the left clamping arm 2 and the right clamping arm 3 are rotated to open to the maximum extent and closed to the minimum extent, the ends of the two arc-shaped racks 6 are respectively pressed against the two corresponding limit blocks 7.

[0046] It should be noted that the two limit blocks are diagonally arranged and centrally symmetrical. They are arranged on the opposite sides of the two support arms and are formed integrally with the support arms.

[0047] In one embodiment of the present invention, the two support arms 5 are correspondingly provided with pin holes 8, and the proximal end of the left clamp arm 2 is fixed with a first front link 10 and a first rear link 11, each of which is L-shaped, at intervals in front and back. The proximal end of the right clamp arm 3 is fixed with a second front link and a second rear link, each of which is L-shaped, at intervals in front and back. The proximal ends of the first front link 10, the first rear link 11, the second front link and the second rear link are all provided with connecting holes corresponding to the pin holes 8. After the proximal ends of the first front link 10 and the second front link are fitted together, they are hinged to the support arm 5 through a pin 9 passing through the connecting hole and the pin hole 8. After the proximal ends of the first rear link 11 and the second rear link are fitted together, they are hinged to the other support arm 5 through a pin 9 passing through the connecting hole and the pin hole 8.

[0048] It will be appreciated that the pins may be Figure 2 A separate pin is provided at each pin hole shown, or a pin can be provided at two pin holes, as long as the left and right clamp arms are effectively hinged with the left and right support arms and the axial movement of the first front and rear connecting rods and the second front and rear connecting rods are restricted to a certain extent. Figure 2The pin and the pin hole can be fixedly bonded, and the connecting hole and the pin are rotatably connected. The end of the pin located between the two support arms has an end cap to prevent the first front and rear connecting rods and the second front and rear connecting rods from axial displacement and breaking or shaking when clamped.

[0049] In one embodiment of the present invention, the driving gear 4 includes a bevel gear 12 and a rotating shaft 13, the proximal end of the rotating shaft 13 is coaxially fixedly connected to the large end of the bevel gear 12, and a first mounting hole 14 is opened in the center of the clamping body seat 1, which passes through the distal and proximal ends of the clamping body seat 1. The rotating shaft 13 is installed in the first mounting hole 14 and has only the freedom to rotate along its central axis. The bevel gear 12 is located outside the distal end surface of the clamping body seat 1 and is engaged with the two arc-shaped racks 6.

[0050] It should be noted that, in addition to the above-mentioned structural form, the driving gear may also be in the form of other gear sets, such as ultimately achieving engagement and transmission of the arc-shaped rack through the cooperation of multiple gears.

[0051] In one embodiment of the present invention, a polygonal hole is opened in the center of the rotating shaft 13, and a prismatic rotating handle 15 can be extended into the polygonal hole from the proximal end of the clamping body seat 1. When the rotating handle 15 rotates, the rotating shaft 13 moves accordingly.

[0052] In one embodiment of the present invention, the self-locking mechanism includes a locking shaft 16, a locking tongue 17 and a self-locking spring 18. A second mounting hole 19 is provided on the edge of the clamp body seat 1, which passes through the proximal and distal ends of the clamp body seat 1. The second mounting holes 19 are arranged in parallel and spaced apart on one side of the first mounting hole 14. The locking shaft 16 is installed in the second mounting hole 19 and has only the freedom to move axially along the second mounting hole 19. The locking tongue 17 is fixed to the distal end of the locking shaft 16, and the self-locking spring 18 is sleeved on the locking shaft 16. When the locking shaft 16 is subjected to an external force from the proximal end to the distal end, it moves toward the distal end and causes the locking tongue 17 to disengage from the tooth groove of the bevel gear 12 and unlock. When the external force disappears, the self-locking spring 18 causes the locking tongue 17 to automatically reset and engage in the tooth groove of the bevel gear 12 and lock.

[0053] In one embodiment of the present invention, the lock shaft 16 is composed of a first shaft segment 20 with a polygonal cross-section and a second shaft segment 21 with a circular cross-section. The proximal end of the first shaft segment 20 is coaxially fixedly connected to the distal end of the second shaft segment 21. The distal end of the first shaft segment 20 is fixedly connected to the lock tongue 17. The side wall of the second shaft segment 21 near the proximal end is connected to a shaft retaining spring 22. The self-locking spring 18 is sleeved on the second shaft segment 21. The second mounting hole 19 includes a polygonal hole segment connected to the distal end face of the clamp body seat 1 and a circular hole segment connected to the proximal end face of the clamp body seat 1. The diameter of the circular hole segment is larger than that of the polygonal hole segment. The circumscribed circle diameter of the hole segment, the clamp seat 1 has an annular step surface at the connection point between the circular hole segment and the polygonal hole segment, the first shaft segment 20 is clearance-matched with the polygonal hole segment, the self-locking spring 18 is in a compressed state and one end is tightly pressed against the shaft retaining spring 22, and the other end is tightly pressed against the annular step surface. When the second shaft segment 21 is subjected to an external force from the proximal end to the distal end, the lock shaft 16 moves toward the distal end and the lock tongue 17 is disengaged from the tooth groove of the bevel gear 12 and unlocked. When the external force is eliminated, the self-locking spring 18 pushes the lock shaft 16 to retract toward the proximal end, and the lock tongue 17 is again stuck in the tooth groove of the bevel gear 12 to achieve locking.

[0054] It should be noted that in addition to the pre-compressed self-locking spring that pushes the lock shaft to retract toward the proximal end to achieve engagement and locking, the self-locking spring can also be set to be in a stretched state at all times by changing the structural form, and retract and reset the lock by pulling when the external force disappears. This structural form of setting does not pose any substantial difficulty to those skilled in the art and should be included in the scope of protection of the present invention.

[0055] In one embodiment of the present invention, a circular groove 23 is provided on the side wall of the second shaft segment 21 close to the proximal end, and the shaft retaining spring 22 is engaged in the circular groove 23 .

[0056] In one embodiment of the present invention, the maximum angle of the left clamp arm 2 and the right clamp arm 3 when opened is 180 degrees, and the minimum angle when closed is 0 degrees. The lengths of the left clamp arm 2 and the right clamp arm 3 are equal and between 12-22 mm.

[0057] The present invention also provides a valve repair device, which includes a conveying device, a disengaging device, a control device and the above-mentioned clamping assembly, wherein the disengaging device is used to connect to or disengage from the clamping assembly, the conveying device is connected to the disengaging device, and is used to convey the disengaging device and the clamping assembly to the target position, and the control device is used to control the conveying device and the disengaging device to achieve conveying, unlocking, and rotating the driving gear 4 to open or close, lock and disengage the left clamp arm 2 and the right clamp arm 3. The conveying device, the disengaging device and the control device are similar to the structures of other existing clamps, except that a cylindrical block is specially provided to press against the proximal end of the locking shaft on the clamp seat to ensure that the locking tongue is disengaged from the bevel gear after the clamp seat is fixed on the conveying device. The other specific structures of each device are not described in detail here. The clamping assembly can directly clamp the valve ring tissue, or it can clamp the valve tissue together with the auxiliary clamp arm used in the existing disclosed valve clamping.

[0058] It should be noted that during the operation, the clamp body seat is fixed on the conveyor. When the rotating handle of the conveyor rotates, it drives the drive gear to rotate. After the driving gear rotates and engages with the driven teeth (arc-shaped racks) of the left clamp arm and the right clamp arm respectively, the clamp arm can only rotate around the pin under the fixing action of the pin, thereby realizing the closing and opening of the two clamp arms, wherein the driven teeth of the clamp arm are designed to be locally effective engaging teeth around the axis of the pin. The clamping group is pre-installed in the conveyor sheath in a closed state (such as a zero-degree angle state), and after being transported to the atrial surgical site, it is used to cut close to the target tissue of the mitral or tricuspid valve annulus, and then the polygonal rotating handle of the clamp body is controlled by the conveying system to make the clamp arm slowly clamp and gradually reduce the angle to clamp the target tissue, thereby playing the role of annular contraction.

[0059] In addition, there is a raised cylindrical block on the upper part of the conveyor where it contacts the bottom of the clamp body seat and is close to the proximal end of the locking shaft of the self-locking mechanism. The cylindrical block applies force to the locking shaft toward the top of the clamp arm, so that the locking tongue and the drive gear can achieve a non-contact state and reach a non-self-locking state (unlocked state). There is a structure for fixing the clamp body seat on the conveyor, and the clamp body seat is installed on the conveyor. At this time, in the non-self-locking state, the opening and closing of the clamp arm is controlled by the rotating handle on the conveyor. As long as the rotating handle is not rotated, the clamp arm will not move, which is equivalent to the driving gear and the rotating handle of the conveyor itself having a locking function. When the clamp body needs to be completely released (dissociated) after the operation and the tissue is locked by the clamp body, the raised cylindrical block on the conveyor moves toward the top of the clamp arm toward the clamp body seat, and the self-locking mechanism rebounds under the action of the spring to achieve self-locking.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A clamping assembly, characterized in that: The invention comprises a clamping mechanism and a self-locking mechanism, wherein the clamping mechanism comprises a clamping body seat (1), a left clamping arm (2), a right clamping arm (3) and a driving gear (4), wherein the distal end of the clamping body seat (1) is symmetrically provided with a support arm (5), the proximal ends of the left clamping arm (2) and the right clamping arm (3) are hinged to the two support arms (5), and the proximal ends of the left clamping arm (2) and the right clamping arm (3) are both provided with an arc-shaped rack (6), and the center of the clamping body seat (1) is rotatably connected to the driving gear (4), and the driving gear (4) is meshed with the two arc-shaped racks (6). When the driving gear (4) rotates, it can drive the left clamping arm (2) and the right clamping arm (3) through the arc-shaped rack (6). The distal ends are moved away from each other to open or moved closer to each other to close, and the self-locking mechanism switches the drive gear (4) between the locked and unlocked states. The drive gear (4) includes a bevel gear (12) and a rotating shaft (13). The proximal end of the rotating shaft (13) is coaxially fixedly connected to the large end of the bevel gear (12). A first mounting hole (14) is provided at the center of the clamping body seat (1) and passes through the distal and proximal ends of the clamping body seat (1). The rotating shaft (13) is installed in the first mounting hole (14) and has only the degree of freedom to rotate along its central axis. The bevel gear (12) is located outside the distal end surface of the clamping body seat (1) and is meshed with the two arc-shaped racks (6). The self-locking mechanism includes a lock shaft (16), a lock tongue (17) and a self-locking spring (18). A second mounting hole (19) is provided on the edge of the clamp body seat (1) and passes through the proximal end and the distal end of the clamp body seat (1). The second mounting hole (19) is arranged on one side of the first mounting hole (14) in parallel and spaced apart. The lock shaft (16) is installed in the second mounting hole (19) and has only the freedom to move axially along the second mounting hole (19). The lock tongue (17) is fixed to the distal end of the lock shaft (16). The self-locking spring (18) is sleeved on the lock shaft (16). When the lock shaft (16) is subjected to an external force directed from the proximal end to the distal end, it moves toward the distal end and causes the lock tongue (17) to disengage from the tooth groove of the bevel gear (12) and be unlocked. When the external force disappears, the self-locking spring (18) causes the lock tongue (17) to automatically reset and engage in the tooth groove of the bevel gear (12) and be locked.

2. A clamping assembly according to claim 1, characterized in that: A limit block (7) is provided on each of the sides of the two support arms (5) facing each other, near the distal end surface. When the left clamping arm (2) and the right clamping arm (3) are rotated to open to the maximum extent and closed to the minimum extent, the ends of the two arc-shaped racks (6) are respectively pressed against the two corresponding limit blocks (7).

3. The clamping assembly according to claim 1, characterized in that: The two support arms (5) are provided with corresponding pin holes (8), and the proximal end of the left clamp arm (2) is fixed with a first front link (10) and a first rear link (11) in an L-shape at intervals in front and back, and the proximal end of the right clamp arm (3) is fixed with a second front link and a second rear link in an L-shape at intervals in front and back, and the proximal ends of the first front link (10), the first rear link (11), the second front link and the second rear link are all provided with connecting holes corresponding to the pin holes (8), and the first front link (10) and the proximal ends of the second front link are hinged to the support arm (5) through a pin (9) passing through the connecting hole and the pin hole (8), and the first rear link (11) and the proximal ends of the second rear link are hinged to the other support arm (5) through a pin (9) passing through the connecting hole and the pin hole (8).

4. The clamping assembly according to claim 1, characterized in that: A polygonal hole is provided at the center of the rotating shaft (13), and a prismatic rotating handle (15) can extend from the proximal end of the clamping body seat (1) into the polygonal hole. When the rotating handle (15) rotates, the rotating shaft (13) moves accordingly.

5. The clamping assembly according to claim 1, characterized in that: The locking shaft (16) is composed of a first shaft segment (20) with a polygonal cross section and a second shaft segment (21) with a circular cross section. The proximal end of the first shaft segment (20) is coaxially fixedly connected to the distal end of the second shaft segment (21). The distal end of the first shaft segment (20) is fixedly connected to the locking tongue (17). A shaft retaining spring (22) is connected to the side wall of the second shaft segment (21) near the proximal end. The self-locking spring (18) is sleeved on the second shaft segment (21). The second mounting hole (19) includes a polygonal hole segment connected to the distal end face of the clamp body seat (1) and a circular hole segment connected to the proximal end face of the clamp body seat (1). The diameter of the circular hole segment is larger than the outer diameter of the polygonal hole segment. The connecting circle diameter is provided in the clamp seat (1) at the connection point between the circular hole section and the polygonal hole section. The first shaft section (20) is loosely matched with the polygonal hole section. The self-locking spring (18) is in a compressed state and one end is pressed against the shaft retaining spring (22), and the other end is pressed against the annular step surface. When the second shaft section (21) is subjected to an external force directed from the proximal end to the distal end, the lock shaft (16) moves toward the distal end and the lock tongue (17) is disengaged from the tooth groove of the bevel gear (12) and unlocked. When the external force is eliminated, the self-locking spring (18) pushes the lock shaft (16) to retract toward the proximal end, and the lock tongue (17) is again engaged in the tooth groove of the bevel gear (12) to achieve locking.

6. The clamping assembly according to claim 5, characterized in that: A circular groove (23) is provided on the side wall of the second shaft section (21) near the proximal end, and the shaft retaining spring (22) is clamped in the circular groove (23).

7. A clamping assembly according to any one of claims 1 to 6, characterized in that: The maximum angle of the left clamp arm (2) and the right clamp arm (3) when opened is 180 degrees, and the minimum angle when closed is 0 degrees. The lengths of the left clamp arm (2) and the right clamp arm (3) are equal and range from 12 to 22 mm.

8. A valve repair device, characterized in that: The invention comprises a conveying device, a disengaging device, a control device and a clamping assembly as claimed in any one of claims 1 to 7, wherein the disengaging device is used to connect with or disengage from the clamping assembly, the conveying device is connected to the disengaging device and is used to convey the disengaging device and the clamping assembly to a target position, and the control device is used to control the conveying device and the disengaging device to realize conveying, unlocking, and rotating the driving gear (4) to open or close, lock and disengage the left clamping arm (2) and the right clamping arm (3).

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