Valve repair device

Abstract

The application provides a valve repair device. The fixed seat of the clamping mechanism is in threaded cooperation with the threaded rod; the distal end of the threaded rod is connected with the connecting seat and can rotate relative to the connecting seat and is axially limited with the connecting seat; the friction locking mechanism comprises an elastic assembly; the connecting seat has an axially extending connecting hole; the elastic assembly is arranged in the connecting hole and the proximal end of the elastic assembly is fixedly connected with the proximal end of the connecting seat; the threaded rod passes through the elastic assembly and the distal end of the threaded rod passes out of the elastic assembly and is provided with an upper locking part; the connecting hole is further provided with a lower locking part opposite to the upper locking part; in the natural state, the elastic assembly elastically abuts against the upper locking part and makes the friction surfaces of the upper and lower locking parts frictionally engaged and locked; the control mechanism is used for controlling the upper locking part to move towards the elastic assembly to make the friction surfaces unlocked and controlling the threaded rod to rotate relative to the fixed seat. The embodiment of the application controls the friction locking state of the threaded rod and the connecting seat through the elastic assembly, is convenient to operate and has very low failure risk.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a valve repair device. Background Technology

[0002] With the rapid aging of my country's population, the incidence of valvular heart disease in the elderly has increased significantly, reducing their quality of life. Valvular regurgitation is a common condition. The prevalence of mitral regurgitation in adults over 35 years of age in my country is 18.4%. Severe mitral regurgitation can cause acute left heart failure symptoms and even cardiogenic shock. Tricuspid regurgitation can cause fatigue, cold skin, shortness of breath, and edema; severe tricuspid regurgitation can suddenly induce severe heart failure. Edge-to-edge repair is a mature surgical technique and a proven method for valvular interventional repair. Based on this principle, numerous valvular repair products have emerged. However, current valvular repair products use friction-based locking after clamping the valve leaflets. The locking performance relies on precise surface machining, which carries a risk of failure. Summary of the Invention

[0003] The purpose of this invention is to provide a valve repair device that uses a dual locking structure of threaded locking and friction locking to lock the valve clamp, making it easy to operate and further reducing the risk of failure.

[0004] To address the aforementioned technical problems, this invention provides a valve repair device, comprising: a clamping mechanism including an upper clamping arm, a lower clamping arm, a connecting rod, a connecting seat, a threaded rod, and a fixed seat; the upper clamping arm and the lower clamping arm are respectively connected to the fixed seat, and the connecting rod is connected to the lower clamping arm and the connecting seat; the fixed seat has an internal thread, the threaded rod has an external thread, and the fixed seat and the threaded rod are threadedly engaged; the distal end of the threaded rod is connected to the connecting seat and is rotatable relative to the connecting seat and axially limited by the connecting seat; the lower clamping arm, the connecting rod, the connecting seat, the threaded rod, and the fixed seat form a crank-slider mechanism;

[0005] A friction locking mechanism includes an elastic component, a connecting seat having an axially extending connecting hole, the elastic component being disposed within the connecting hole and its proximal end being fixedly connected to the proximal end of the connecting seat; a threaded rod passing through the elastic component and its distal end extending out of the elastic component and having an upper locking portion, and a lower locking portion opposite to the upper locking portion being provided in the connecting hole; the upper locking portion and the lower locking portion having opposing friction surfaces, wherein in a natural state the elastic component elastically abuts against the upper locking portion and the friction surfaces engage and lock; when the friction surfaces are unlocked, the threaded rod is rotatable relative to the elastic component and the connecting seat; and

[0006] A control mechanism, the distal end of which is connected to the fixed seat, the threaded rod and the upper locking part respectively and is capable of being disengaged from the fixed seat, the threaded rod and the upper locking part, the control mechanism is used to transport the clamping mechanism, the control mechanism is also used to control the upper locking part to move toward the elastic component to unlock the friction surface, and is used to control the threaded rod to rotate relative to the fixed seat to adjust the distance between the fixed seat and the connecting seat.

[0007] As one embodiment, the control mechanism includes: a release wire, a rotary drive assembly, and a fixed base connecting pipe;

[0008] The distal end of the fixed seat connecting pipe can be connected to the fixed seat to control the fixed seat, and the fixed seat connecting pipe can also be withdrawn from the fixed seat.

[0009] The rotary drive assembly passes through the fixed base connecting pipe and the fixed base, and is capable of axial movement and circumferential rotation along the fixed base connecting pipe and the fixed base; the distal end of the rotary drive assembly can be connected to the proximal end of the threaded rod, and can drive the threaded rod to rotate relative to the fixed base; the rotary drive assembly, the threaded rod, and the upper locking part have a release wire channel for the release wire to pass through, the release wire passes through the release wire channel and its distal end extends into the upper locking part and is connected to the upper locking part, the release wire can drive the upper locking part to move toward the elastic component; the release wire can also be released from the upper locking part.

[0010] As one embodiment, the rotary drive assembly includes: a spring hose and a connecting rod coaxially connected from the distal end to the proximal end;

[0011] The connecting rod has a cross-shaped protrusion extending axially at its distal end, and the threaded rod has a cross-shaped groove extending axially at its proximal end. The cross-shaped groove is adapted to the cross-shaped protrusion to drive the threaded rod to rotate via the connecting rod.

[0012] As one embodiment, the upper locking part is provided with a pin groove, and a fixing pin extending radially is provided in the pin groove. The spring hose, connecting rod, threaded rod and the upper locking part have a release wire channel that extends through to the limiting pin. The release wire is folded in half to form a collar, and the collar is sleeved on the fixing pin and both ends of the release wire extend out of the proximal end of the spring hose.

[0013] As one embodiment, the fixed base connecting pipe includes a cylindrical connecting pipe section and a plurality of connecting plates extending axially from the distal end of the connecting pipe section. The bottom outer side of the connecting plate is provided with a buckle, and the side wall of the fixed base is provided with a slot adapted to the buckle. In its natural state, the connecting plate retracts inward and can be inserted into the fixed base, and the buckle corresponds to the position of the slot. When the rotary drive assembly is inserted between the plurality of connecting plates of the fixed base connecting pipe, it can drive the connecting plate to open so that the buckle is engaged in the slot. When the rotary drive assembly is withdrawn from the fixed base connecting pipe, the connecting plate can elastically return so that the buckle is disengaged from the slot.

[0014] As one embodiment, the elastic component includes: an upper stop block, an elastic element, and a baffle, which are sequentially disposed in the connecting hole from the proximal end to the distal end; the elastic element is capable of elastically extending and retracting along the moving direction of the upper locking part;

[0015] The threaded rod includes a threaded segment and a smooth rod segment connected sequentially from the proximal end to the distal end; the upper stop, the elastic element, and the baffle are all provided with through holes for the smooth rod segment to pass through, and the length of the smooth rod segment is less than the length of the elastic component in its natural state.

[0016] As one embodiment, the connecting hole is a rectangular through hole extending axially along the connecting seat;

[0017] Optionally, the upper end face of the upper stop block coincides with the upper end face of the connecting seat, and the threaded section of the threaded rod ends at the upper end face of the upper stop block; the lower end face of the lower locking part coincides with the lower end face of the connecting seat.

[0018] As one embodiment, both the lower end face of the baffle and the upper end face of the upper locking part are smooth surfaces;

[0019] Optionally, both the upper stop and the lower locking part are welded or bonded to the connecting seat.

[0020] As one embodiment, the elastic element is a U-shaped spring sheet;

[0021] Optionally, the open end of the U-shaped spring sheet faces the upper stop block.

[0022] As one embodiment, the upper locking part has a frustoconical part at its distal end, and the lower locking part has a frustoconical groove adapted to the frustoconical part, the opposing surfaces of the frustoconical part and the frustoconical groove forming the friction surface;

[0023] Optionally, the friction surface is formed by sandblasting.

[0024] Optionally, the external thread angle of the threaded rod is between 0 and 5°.

[0025] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects:

[0026] In the valve repair device of this invention, the internal thread of the fixing seat of the clamping mechanism and the external thread of the threaded rod are threadedly engaged. The clamping mechanism is driven by a control mechanism to move the fixing seat axially relative to the threaded rod, controlling the opening and closing of the clamping mechanism. At the same time, the threaded rod and the fixing seat can be locked by a thread self-locking structure. Furthermore, the threaded rod and the connecting seat are locked by the friction surfaces of the upper locking part at the distal end of the threaded rod and the lower locking part in the connecting seat. This achieves dual locking through thread self-locking and friction locking, further reducing the risk of failure. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. It is understood that the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the valve repair device in the open state provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the valve repair device in its closed state according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the control mechanism of the valve repair device provided in an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the clamping mechanism of the valve repair device provided in an embodiment of the present invention;

[0032] Figure 5 A cross-sectional structural schematic diagram of the friction locking mechanism of the valve repair device provided in an embodiment of the present invention;

[0033] Figure 6a This is a schematic diagram of the connection seat of the valve repair device provided in an embodiment of the present invention;

[0034] Figure 6b A cross-sectional structural diagram of the connector of the valve repair device provided in an embodiment of the present invention;

[0035] Figure 7a This is a schematic diagram of the threaded rod of the valve repair device provided in an embodiment of the present invention;

[0036] Figure 7bA schematic cross-sectional view of the threaded rod of the valve repair device provided in an embodiment of the present invention;

[0037] Figure 8a This is a schematic diagram of the structure of the fixation seat of the valve repair device provided in an embodiment of the present invention;

[0038] Figure 8b This is a cross-sectional structural diagram of the fixation seat of the valve repair device provided in an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand the present invention. However, the technical solutions claimed in the present invention can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0040] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] It should be noted that, unless otherwise explicitly stated, the terms “connected” and “linked” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components.

[0042] In the description of this invention, it should be noted that, in the field of interventional medical devices, the proximal end refers to the end closer to the operator, while the distal end refers to the end farther from the operator; the axial direction refers to the direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device in its natural state. The above definitions are for ease of expression only and should not be construed as limiting the invention.

[0043] Please see Figures 1 to 5 As shown in Figures 6a and 6b, this embodiment of the invention provides a valve repair device for interventional valve repair. The valve repair device of this embodiment mainly includes: a control mechanism 1, a clamping mechanism 2, and a friction locking mechanism.

[0044] The clamping mechanism 2 includes an upper clamping arm 201, a lower clamping arm 202, a connecting rod 203, a connecting seat 204, a threaded rod 205, and a fixed seat 206. The upper clamping arm 201 and the lower clamping arm 202 are respectively connected to the fixed seat 206, and the connecting rod 203 is connected to both the lower clamping arm 202 and the connecting seat 204. The fixed seat 206 has an internal thread, and the threaded rod 205 has an external thread. The fixed seat 206 and the threaded rod 205 are threadedly engaged; that is, the fixed seat 206 is sleeved on the threaded rod 205 and threadedly connected to it. The threaded rod 205 and the fixed seat 206 achieve axial relative movement through the threaded engagement and also achieve thread self-locking. The distal end of the threaded rod 205 is connected to the connecting seat 204 and can rotate relative to the connecting seat 204 while being axially limited by the connecting seat 204. This allows the threaded rod 205 to rotate freely relative to the fixed seat 206 while maintaining its axial relative position with the connecting seat 204. The lower clamping arm 202, connecting rod 203, connecting seat 204, threaded rod 205, and fixed seat 206 form a crank-slider mechanism. By manipulating this mechanism, the valve clamp can be opened and closed to capture and clamp the valve leaflets. When the threaded rod 205 is rotated, causing the fixed seat 206 to move away from the threaded rod 205, the clamping mechanism 2 opens. When the fixed seat 206 approaches the threaded rod 205, the clamping mechanism 2 closes and clamps the valve leaflets. The threaded rod 205 and the fixed seat 206 are locked together by a threaded self-locking mechanism. The clamping mechanism 2, as a valve clamp, is a long-term implant used to treat valvular regurgitation.

[0045] The friction locking mechanism includes an elastic component 300, and a connecting seat 204 having an axially extending connecting hole 2041, within which the elastic component 300 is disposed. The proximal end of the elastic component 300 is fixedly connected to the proximal end of the connecting seat 204. A threaded rod 205 passes through the elastic component 300, with its distal end extending out of the elastic component 300 and having an upper locking portion 304. A lower locking portion 306, opposite to the upper locking portion 304, is also provided within the connecting hole 2041. The upper locking portion 304 and the lower locking portion 306 have opposing frictional surfaces. In its natural state, the elastic component 300 elastically abuts against the upper locking portion 304, causing the frictional surfaces to engage and lock, thereby achieving locking between the threaded rod 205 and the connecting seat 204 through frictional force. When the friction surface is unlocked, the threaded rod 205 can rotate relative to the elastic component 300 and the connecting seat 205. At this time, the threaded rod 205 can be rotated relative to the fixed seat 206 by rotating the drive component to adjust the distance between the fixed seat 206 and the connecting seat 204, thereby adjusting the opening and closing and locking state of the flap clamp.

[0046] The distal end of the control mechanism 1 is connected to the fixing seat 206, the threaded rod 205, and the upper locking part 304. The control mechanism 1 can be disengaged from the fixing seat 206, the threaded rod 205, and the upper locking part 304. That is, after the valve clamp clamps and locks the valve leaflet, the control mechanism 1 can be disengaged from the clamping mechanism 2 and withdrawn from the body, leaving only the clamping mechanism 2 implanted in the body. The control mechanism 1 is also used to transport the clamping mechanism 2, that is, to transport the clamping mechanism 2 to the target treatment position. The control mechanism 1 is also used to control the upper locking part 304 to move toward the elastic component 300 to unlock the friction surface. When the upper locking part 304 moves toward the elastic component 300 (i.e., the proximal end), the elastic component 300 can be elastically contracted under force, creating a gap between the friction surfaces of the upper locking part 304 and the lower locking part 306, thereby unlocking the friction surface and allowing the upper locking part 304 to rotate relative to the lower locking part 306. The control mechanism 1 is also used to control the rotation of the threaded rod 205 relative to the fixed seat 206 to adjust the distance between the fixed seat 206 and the connecting seat 205. Therefore, through the threaded self-locking structure between the threaded rod 205 and the fixed seat 206 and the friction locking structure between the threaded rod 205 and the connecting seat 204, the clamping state of the flap clamp can be double-locked, further reducing the risk of flap clamp locking failure.

[0047] Please see Figure 3 As shown, the control mechanism 1 includes a release wire 101, a rotary drive assembly, and a fixed base connecting pipe 103.

[0048] The distal end of the fixed seat connecting pipe 103 can be connected to the fixed seat 206 to control the fixed seat 206, and the fixed seat connecting pipe 103 can also be withdrawn from the fixed seat 206.

[0049] Please see Figure 8a , 8b As shown, the fixed base connecting pipe 103 includes a cylindrical connecting pipe section 1031 and a plurality of connecting plates 1032 extending axially from the distal end of the connecting pipe section 1031. The rotary drive assembly can be inserted into the fixed base connecting pipe 103 and can move axially and rotate circumferentially within the fixed base connecting pipe 103. The connecting plate 1032 has a buckle 1033 on its outer bottom end, and the side wall of the fixing seat 206 has a slot 2062 that matches the buckle 1033. The connecting plate 1032 retracts inward in its natural state and can be inserted into the fixing seat 206. The buckle 1033 and the slot 2062 are positioned correspondingly. When the rotation drive component is inserted between the multiple connecting plates 1032 of the fixing seat connecting tube 103, it can drive the connecting plate 1032 to open so that the buckle 1033 can be inserted into the slot 2062 of the fixing seat 206. When the rotation drive component is withdrawn from the fixing seat connecting tube 103, the connecting plate 1032 can elastically return so that the buckle 1033 can be dislodged from the slot 2062.

[0050] There can be two connecting plates 1032, arranged symmetrically along an axis. After heat setting, the connecting plates 1032 are bent inward in their natural state, allowing the fixing base connecting tube 103 to be inserted into the fixing base 206 from the top, and enabling the buckle 1033 to correspond to the slot 2062. However, the buckle 1033 will not be embedded in the slot 2062 in its natural state, and the fixing base connecting tube 103 can still be pulled out of the fixing base 206. Rectangular slots 2062 are symmetrically provided on both sides of the top of the fixing base 206. When the rotary drive assembly is inserted between the two connecting plates 1032 of the fixing base connecting tube 103, the rotary drive assembly pushes the buckles 1033 on the two connecting plates 1032 into the slots 2062 of the fixing base 206, thus fixing the fixing base connecting tube 103 to the fixing base 206. When the rotary drive assembly is pulled out of the fixed seat connecting tube 103, the two connecting plates 1032 of the fixed seat connecting tube 103 bend inward and retract under their own elastic restoring force, causing the buckles 1033 at the ends of the connecting plates 1032 to disengage from the slots 2062 of the fixed seat 206, so that the fixed seat connecting tube 103 can be pulled out of the fixed seat 206.

[0051] A rotary drive assembly passes through the fixed base connecting pipe 103 and the fixed base 206, and is capable of axial movement and circumferential rotation along the fixed base connecting pipe 103 and the fixed base 206. The distal end of the rotary drive assembly can be connected to the proximal end of the threaded rod 205, and can drive the threaded rod 205 to rotate relative to the fixed base 206. The rotary drive assembly, the threaded rod 205, and the upper locking part 304 have a release wire channel for the release wire 101 to pass through. The release wire 101 passes through the release wire channel, and its distal end can extend into and connect to the upper locking part 304. The release wire 101 can drive the upper locking part 304 to move toward the elastic component 300. The release wire 101 can also be released from the upper locking part 304. The fixed base 206 can be controlled through the fixed base connecting pipe 103, and the threaded rod 205 can be driven to rotate through the rotary drive assembly, driving the threaded rod 205 to move relative to the fixed base 206, realizing the opening and closing of the flap clamp, and can automatically lock the clamping state of the flap clamp.

[0052] Please see Figure 3 , Figure 7a and Figure 7bAs shown, the rotary drive assembly may include a spring hose 102 and a connecting rod 104 coaxially connected from the distal end to the proximal end. The distal end of the connecting rod 104 has an axially extending cross-shaped protrusion 1041, and the proximal end of the threaded rod 205 has an axially extending cross-shaped groove 2052. The cross-shaped groove 2052 is adapted to the cross-shaped protrusion 1041 to drive the threaded rod 205 to rotate via the connecting rod 104. It is understood that the connecting rod 104 can also use other suitable structures to drive the threaded rod 205 to rotate, such as a straight protrusion, and correspondingly, the threaded rod 205 has a straight groove adapted to the straight protrusion. This embodiment does not impose specific limitations on the transmission and engagement structure between the connecting rod 104 and the threaded rod 205, as long as the connecting rod 104 can conveniently and effectively drive the threaded rod 205 to rotate. The distal end of the spring hose 102 and the proximal end of the connecting rod 104 can be coaxially fixedly connected by welding or bonding, so that the spring hose 102 can drive the connecting rod 104 to rotate. The spring hose 102 has a certain degree of elasticity and rotation. The spring hose 102 drives the connecting rod 104 to rotate, which in turn drives the threaded rod 205 to rotate, thus providing feedback on the operating force.

[0053] The upper locking part 304 has a pin groove, and a fixing pin 305 extending radially is provided in the pin groove. The spring hose 102, connecting rod 104, threaded rod 205 and upper locking part 304 have a release wire channel that extends to the fixing pin 305. The connecting rod 104 and threaded rod 205 both have through holes. The release wire 101 is folded in half to form a collar 1011, which is fitted onto the fixing pin 305. Both ends of the release wire 1011 extend out of the proximal side of the spring hose 102. That is, one end of the release wire 101 is inserted into the release wire channel to reach the fixing pin 305 and then folded back out of the release wire channel. Both ends of the release wire 101 are exposed outside the spring hose 102, so that it can be connected to the external operating handle. The release wire 101 and the fixing pin 305 apply a pulling force to the upper locking part 304, so that the friction surface of the upper locking part 304 separates from the friction surface of the lower locking part 306 to unlock. The fixing pin 305 can be set at the middle position of the upper locking part 304, and a through hole extending radially is machined at the middle position of the upper locking part 304 for installing the fixing pin 305.

[0054] Please see Figure 5 As shown, the elastic component 300 may include an upper stop 301, an elastic element 302, and a baffle 303, which are sequentially disposed in the connecting hole 2041 from proximal to distal end. The elastic element 302 is capable of elastic extension and retraction along the moving direction of the upper locking part 304. The threaded rod 205 includes a threaded segment 2051 and a smooth rod segment 2053, which are sequentially connected from proximal to distal end. The upper stop 301, the elastic element 302, and the baffle 303 are all provided with through holes for the smooth rod segment 2053 to pass through, and the length of the smooth rod segment 2053 is less than the length of the elastic component 300 in its natural state.

[0055] The smooth tube segment 2053 of the threaded rod 205 is cylindrical. The upper stop 301, elastic element 302, and baffle 303 are all provided with circular through holes, and these holes are coaxially arranged. The diameter of the circular through holes can be slightly larger than the diameter of the smooth rod segment 2053, allowing the smooth rod segment 2053 to rotate freely relative to the elastic component. The distance between the upper end face of the upper locking part 304 and the upper end face of the elastic component 300 is the length of the smooth rod segment 2053. Since the length of the smooth rod segment 2053 is less than the length of the elastic component 300 in its natural state, the elastic component 300 is always subjected to compressive force. This compressive force is the same as the pressure exerted by the elastic component 300 on the upper locking part 304, thereby allowing the friction surfaces of the upper locking part 304 and the lower locking part 306 to make close contact and frictionally engage, achieving frictional locking between the threaded rod 205 and the connecting seat 204. When the release wire 101 pulls the fixing pin 305, the elastic component 300 is further compressed, causing the upper locking part 304 to move slightly upward so that the upper locking part 304 can axially create a gap with the lower locking part 306, so that the friction surfaces of the upper locking part 304 and the lower locking part 306 no longer contact each other, thereby allowing the threaded rod 205 to rotate axially relative to the connecting seat 204.

[0056] The threaded section 2051 of the threaded rod 205 is provided with external threads. The external thread angle of the threaded rod 205 is between 0 and 5°. Because the thread angle is very small, the axial movement distance of the threaded rod 205 in one revolution is very small, so the clamping state can be precisely adjusted and the risk of thread self-locking failure can be reduced.

[0057] The elastic element 302 can be a U-shaped spring. For example, the open end of the U-shaped spring can face the upper stop 301, or the open end of the U-shaped spring can face the baffle 303. The U-shaped spring needs to have a certain width so that after elastic deformation, it can provide sufficient holding force, allowing the baffle 303 to apply sufficient force to push the upper locking part 304, ensuring that the friction surfaces of the upper locking part 304 and the lower locking part 306 are always in close contact and frictionally engaged, maintaining a good locking state. The U-shaped spring can be made of nickel-titanium alloy. The friction locking mechanism 3 controls the frictional engagement state of the upper locking part 304 and the lower locking part 306 through the material properties of the U-shaped spring itself, exhibiting high reliability and transmission efficiency. It is understood that the elastic element 302 can also adopt other shapes and structures, as long as they meet the requirements for reliable friction locking.

[0058] The upper locking part 304 has a frustoconical portion at its distal end, and the lower locking part 306 has a frustoconical groove that matches the frustoconical portion. The opposing surfaces of the frustoconical portion and the frustoconical groove constitute a friction surface. The frustoconical friction surface makes the friction locking of the upper locking part 304 and the lower locking part 306 more stable and reliable. The friction surfaces of the upper locking part 304 and the lower locking part 306 can be formed by sandblasting, thereby giving them a good coefficient of friction.

[0059] Both the lower end face of the baffle 303 and the upper end face of the upper locking part 304 are smooth surfaces, resulting in very low friction between the elastic component 300 and the upper locking part 304. This allows the upper locking part 304 to rotate freely and flexibly relative to the elastic component 300. The baffle 303 can be made of a rigid material, giving it a very low deformation capacity.

[0060] For example, the connecting hole 2041 of the connector 204 can be a rectangular through hole extending along the axial direction of the connector 204. It is understood that the connecting hole 2041 can also be other polygonal through holes, or through holes of other shapes.

[0061] The threaded rod 205 and the upper locking part 304 can be welded or bonded together, ensuring they are coaxial. Both the upper stop 301 and the lower locking part 306 can be welded or bonded to the connecting seat 204. The upper end face of the upper stop 301 coincides with the upper end face of the connecting seat 204, and the threaded section 2051 of the threaded rod 205 terminates at the upper end face of the upper stop 301. The lower end face of the lower locking part 306 coincides with the lower end face of the connecting seat 204.

[0062] There are two upper clamping arms 201, two lower clamping arms 202, and two connecting rods 203, but this is not the only possibility; in some examples, there may be three. The upper clamping arm 201 is heat-treated and then fastened to the fixing seat 206 and fixedly connected thereto. Each side of the upper clamping arm 201 has a pull wire; by tightening the pull wires with an external handle, the clamping plates on both sides of the upper clamping arm 201 are pressed tightly against the fixing seat 206. The connecting rod 203 is connected to the connecting seat 204, the lower clamping arm 202, and the fixing seat 206 via pins or rivets. It is understood that this embodiment does not impose specific limitations on the shape, structure, or connection method of the upper clamping arm 201, lower clamping arm 202, and connecting rod 203 of the clamping mechanism 2.

[0063] In this embodiment of the invention, the upper clamping arm 201 and the U-shaped spring are preferably made of nickel-titanium alloy, and the release wire 101 is made of wear-resistant polymer thread such as polyethylene; the remaining parts are preferably made of cobalt-chromium alloy, titanium-based alloy or 316L stainless steel.

[0064] Please see Figures 1 to 5 As shown below, the working principle of the valve repair device in this embodiment will be illustrated by example.

[0065] The valve repair device of this invention is in the initial state as follows: Figure 2 In the closed state shown, both ends of the release wire 101 are fixedly connected to the external control handle, and the proximal end of the spring hose 102 is fixedly connected to the external control handle. The spring hose 102 and the release wire 101 can be controlled by separate handles, or they can be controlled by the same handle, so as to facilitate the synchronous rotation of the spring hose 102 and the release wire 101. The proximal end of the fixing seat connecting tube 103 is fixedly connected to the delivery sheath.

[0066] During delivery, the valve repair device maintains... Figure 2 As shown in the diagram. When it reaches above the leaflet, the release wire 101 is tightened by the external handle, causing the fixing pin 305 to move the upper locking part 304 and the baffle 303 proximally, deforming the elastic element 302. At this time, the frustoconical rough surface of the upper locking part block 304 separates from the rough surface of the frustoconical groove of the lower locking part block 306; the release wire 101 and the spring hose 102 are driven to rotate synchronously by the external handle, thereby driving the connecting rod 104 and the threaded rod 205 to rotate synchronously, causing the fixing seat 206 to move proximally along the threaded rod 205 (away from the connecting seat 204), and the lower clamping arm 202 gradually opens. The valve clamp is delivered to the distal end, so that the valve leaflet rests on the lower clamping arm 202; the traction line of the upper clamping arm 201 is released by the external control handle, so that the upper clamping arm 201 returns to its heat-set shape, and the upper clamping arm 201 and the lower clamping arm 202 clamp the valve leaflet; the release wire 101 and the spring hose 102 are rotated in opposite directions by operating the external handle again, so that the fixing seat 206 moves to the distal end along the threaded rod 205 (even if the fixing seat 206 is close to the connecting seat 204), and the lower clamping arm 202 gradually closes to complete the valve leaflet clamping.

[0067] After confirming that the leaflet clamping state meets the requirements, the release wire 101 is released via the external handle. The elastic element 302 returns to its heat-set state, pushing the baffle 303 and the upper locking block 304 to the distal end, causing the frustum-shaped rough surface at the distal end of the upper locking part 304 and the rough surface of the frustum-shaped groove at the proximal end of the lower locking part 306 to fit tightly together. In this state, the rotational friction between the two rough surfaces is greater than the rotational driving force applied by the handle or the leaflet and the upper clamping arm 201, thereby maintaining a stable clamping state for the leaflet clamp, and the leaflet clamp no longer closes or opens.

[0068] After confirming that the valve clamp has successfully clamped the valve leaflets, pull one end of the release wire 101 from the handle until it is completely removed. Then, retract the spring hose 102 from the handle end, causing the connecting rod 104 to move proximally until it retracts into the sheath. Finally, the connecting plate 1032 at the distal end of the fixing seat connecting tube 103 loses the support of the connecting rod 104 and returns to its heat-set inward-fastening shape. The latch 1033 of the connecting plate 1032 disengages from the slot 2062 of the fixing seat, separating the fixing seat connecting tube 103 from the fixing seat 206. At this point, the valve clamp release is complete, and the delivery sheath can be withdrawn from the body.

[0069] In this embodiment of the invention, the movement of the fixing seat 206 along the threaded rod 205 can be achieved through external rotational drive. Furthermore, this invention relies on the material properties of the elastic element 302 to control the frictional locking state of the upper locking part 304 and the lower locking part 306; compared to threaded self-locking, it has higher reliability and transmission efficiency. Moreover, it is simple to operate, has high surgical efficiency, and the release method is repeatable, avoiding the risks caused by intraoperative misoperation.

[0070] Based on the above technical solution, the present invention has at least the following advantages and positive effects:

[0071] In the valve repair device of this invention, the internal thread of the fixing seat of the clamping mechanism and the external thread of the threaded rod are threadedly engaged. The clamping mechanism is driven by a control mechanism to move the fixing seat axially relative to the threaded rod, controlling the opening and closing of the clamping mechanism. At the same time, the threaded rod and the fixing seat can be locked by a thread self-locking structure. Furthermore, the threaded rod and the connecting seat are locked by the friction surfaces of the upper locking part at the distal end of the threaded rod and the lower locking part in the connecting seat. This achieves dual locking through thread self-locking and friction locking, further reducing the risk of failure.

[0072] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A valve repair device, characterized in that, include: A clamping mechanism includes an upper clamping arm, a lower clamping arm, a connecting rod, a connecting seat, a threaded rod, and a fixed seat. The upper and lower clamping arms are respectively connected to the fixed seat, and the connecting rod is connected to the lower clamping arm and the connecting seat. The fixed seat has an internal thread, and the threaded rod has an external thread. The fixed seat and the threaded rod are threadedly engaged. The distal end of the threaded rod is connected to the connecting seat and can rotate relative to the connecting seat and is axially limited by the connecting seat. The lower clamping arm, connecting rod, connecting seat, threaded rod, and fixed seat form a crank-slider mechanism. A friction locking mechanism includes an elastic component, a connecting seat having an axially extending connecting hole, the elastic component being disposed within the connecting hole and its proximal end being fixedly connected to the proximal end of the connecting seat; a threaded rod passing through the elastic component and its distal end extending out of the elastic component and having an upper locking portion, and a lower locking portion opposite to the upper locking portion being provided in the connecting hole; the upper locking portion and the lower locking portion having opposing friction surfaces, wherein in a natural state the elastic component elastically abuts against the upper locking portion and causes the friction surfaces to engage and lock; when the friction surfaces are unlocked, the threaded rod is rotatable relative to the elastic component and the connecting seat; and A control mechanism, the distal end of which is connected to the fixed seat, the threaded rod and the upper locking part respectively and is capable of being disengaged from the fixed seat, the threaded rod and the upper locking part, the control mechanism is used to transport the clamping mechanism, the control mechanism is also used to control the upper locking part to move toward the elastic component to unlock the friction surface, and is used to control the threaded rod to rotate relative to the fixed seat to adjust the distance between the fixed seat and the connecting seat; The elastic component includes: an upper stop block, an elastic element, and a baffle, which are sequentially disposed in the connecting hole from the proximal end to the distal end; the elastic element is capable of elastically extending and retracting along the moving direction of the upper locking part. The threaded rod includes a threaded segment and a smooth rod segment connected sequentially from the proximal end to the distal end; the upper stop, the elastic element, and the baffle are all provided with through holes for the smooth rod segment to pass through, and the length of the smooth rod segment is less than the length of the elastic component in its natural state.

2. The valve repair device according to claim 1, characterized in that, The control mechanism includes: a release wire, a rotary drive assembly, and a fixed base connecting pipe; The distal end of the fixed seat connecting pipe can be connected to the fixed seat to control the fixed seat, and the fixed seat connecting pipe can also be withdrawn from the fixed seat. The rotary drive assembly passes through the fixed base connecting pipe and the fixed base, and is capable of axial movement and circumferential rotation along the fixed base connecting pipe and the fixed base; the distal end of the rotary drive assembly can be connected to the proximal end of the threaded rod, and can drive the threaded rod to rotate relative to the fixed base; the rotary drive assembly, the threaded rod, and the upper locking part have a release wire channel for the release wire to pass through, the release wire passes through the release wire channel and its distal end extends into the upper locking part and is connected to the upper locking part, the release wire can drive the upper locking part to move toward the elastic component; the release wire can also be released from the upper locking part.

3. The valve repair device according to claim 2, characterized in that, The rotary drive assembly includes: a flexible spring and a connecting rod coaxially connected from the distal end to the proximal end; The connecting rod has a cross-shaped protrusion extending axially at its distal end, and the threaded rod has a cross-shaped groove extending axially at its proximal end. The cross-shaped groove is adapted to the cross-shaped protrusion to drive the threaded rod to rotate via the connecting rod.

4. The valve repair device according to claim 3, characterized in that, The upper locking part is provided with a pin groove, and a fixing pin extending radially is provided in the pin groove. The spring hose, connecting rod, threaded rod and the upper locking part have a release wire channel that extends through to the limiting pin. The release wire is folded in half to form a collar. The collar is sleeved on the fixing pin and both ends of the release wire extend out of the proximal end of the spring hose.

5. The valve repair device according to claim 2, characterized in that, The fixed base connecting pipe includes a cylindrical connecting pipe section and a plurality of connecting plates extending axially from the distal end of the connecting pipe section. The bottom outer side of the connecting plate is provided with a buckle, and the side wall of the fixed base is provided with a slot adapted to the buckle. The connecting plate retracts inward in its natural state and can be inserted into the fixed base, and the buckle and the slot are positioned corresponding to each other. When the rotary drive assembly is inserted between the multiple connecting plates of the fixed base connecting tube, it can drive the connecting plates to open so that the buckle can be engaged in the slot. When the rotary drive assembly is withdrawn from the fixed base connecting tube, the connecting plates can elastically return so that the buckle can be disengaged from the slot.

6. The valve repair device according to claim 1, characterized in that, The connecting hole is a rectangular through hole extending axially along the connecting seat.

7. The valve repair device according to claim 1, characterized in that, The upper end face of the upper stop block coincides with the upper end face of the connecting seat, and the threaded section of the threaded rod ends at the upper end face of the upper stop block; the lower end face of the lower locking part coincides with the lower end face of the connecting seat.

8. The valve repair device according to claim 1, characterized in that, Both the lower end face of the baffle and the upper end face of the upper locking part are smooth surfaces.

9. The valve repair device according to claim 1, characterized in that, Both the upper stop and the lower locking part are welded or bonded to the connecting seat.

10. The valve repair device according to claim 1, characterized in that, The elastic element is a U-shaped spring sheet.

11. The valve repair device according to claim 10, characterized in that, The open end of the U-shaped spring sheet faces the upper stop block.

12. The valve repair device according to any one of claims 1 to 11, characterized in that, The upper locking part has a frustoconical part at its distal end, and the lower locking part has a frustoconical groove that is adapted to the frustoconical part. The opposing surfaces of the frustoconical part and the frustoconical groove constitute the friction surface.

13. The valve repair device according to claim 1, characterized in that, The friction surface is formed by sandblasting.

14. The valve repair device according to claim 1, characterized in that, The external thread angle of the threaded rod is between 0 and 5°.

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