CN116138929A

CN116138929A - Valve repair device

Info

Publication number: CN116138929A
Application number: CN202211106188.9A
Authority: CN
Inventors: 请求不公布姓名; 刘载淳; 陈刘斌
Original assignee: Shanghai Tendfo Medical Technologies Co Ltd
Current assignee: Shanghai Tendfo Medical Technologies Co Ltd
Priority date: 2022-09-10
Filing date: 2022-09-10
Publication date: 2023-05-23

Abstract

The invention provides a valve repair device. Wherein, the fixing seat of the clamping mechanism is in threaded fit 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 limit the threaded rod axially with the connecting seat; the friction locking mechanism comprises an elastic component, the connecting seat is provided with a connecting hole extending along the axial direction, the elastic component is arranged in the connecting hole, and the proximal end of the elastic component is fixedly connected with the proximal end of the connecting seat; the threaded rod penetrates through the elastic component, the far end of the threaded rod penetrates out of the elastic component and is provided with an upper locking part, and a lower locking part opposite to the upper locking part is also arranged in the connecting hole; the elastic component is elastically propped against the upper locking part in a natural state and ensures that friction surfaces of the upper locking part and the lower locking part are in friction engagement locking; the control mechanism is used for controlling the upper locking part to move towards the elastic component so as to unlock the friction surface and control the threaded rod to rotate relative to the fixed seat. According to the embodiment of the invention, the elastic component is used for controlling the friction locking state of the threaded rod and the connecting seat, so that the operation is convenient, and the failure risk is very low.

Description

Valve repair device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a valve repairing device.

Background

With the rapid development of population aging in China, the incidence rate of valvular disease of the aged is obviously increased, and the life quality of the aged is reduced. Among them, valve regurgitation is a common disorder. Mitral regurgitation has a total prevalence of 18.4% in adults over 35 years old in our country, and severe mitral regurgitation can manifest acute left heart failure symptoms, even cardiogenic shock. Tricuspid regurgitation can lead to patient sensory fatigue, cold skin, dyspnea, and severe heart failure can be suddenly induced by severe tricuspid regurgitation outside of oedema. The edge-to-edge repair technology is a mature surgical technology and is also a mature technology expanded to valve interventional repair. Based on this valve repair principle, numerous valve repair products emerge. However, the valve repair product at the present stage adopts a friction force limiting locking mode after clamping the valve leaflet, the locking limiting performance depends on precise surface processing, and the failure risk exists.

Disclosure of Invention

An object of embodiments of the present invention is to provide a valve repair device that locks the state of a valve clip by a double locking structure of screw locking and friction locking, is easy to operate, and further reduces the risk of failure.

To solve the above technical problems, an embodiment of the present invention provides a valve repair device, including: the clamping mechanism comprises an upper clamping arm, a lower clamping arm, a connecting rod, a connecting seat, a threaded rod and a fixing seat; the upper clamping arm and the lower clamping arm are respectively connected with the fixed seat, and the connecting rod is connected with the lower clamping arm and the connecting seat; the fixing seat is provided with an internal thread, the threaded rod is provided with an external thread, and the fixing seat is in threaded fit with the threaded rod; the distal end of the threaded rod is connected with the connecting seat, can rotate relative to the connecting seat and is limited with the connecting seat axially; the lower clamping arm, the connecting rod, the connecting seat, the threaded rod and the fixing seat form a crank slide block mechanism;

the friction locking mechanism comprises an elastic component, the connecting seat is provided with a connecting hole extending along the axial direction, the elastic component is arranged in the connecting hole, and the proximal end of the elastic component is fixedly connected with the proximal end of the connecting seat; the threaded rod penetrates through the elastic component, the far end of the threaded rod penetrates out of the elastic component and is provided with an upper locking part, and a lower locking part opposite to the upper locking part is also arranged in the connecting hole; the upper locking part and the lower locking part are provided with opposite friction surfaces, and the elastic component is elastically abutted against the upper locking part in a natural state and enables the friction surfaces to be in friction engagement locking; when the friction surface is unlocked, the threaded rod can rotate relative to the elastic component and the connecting seat; a kind of electronic device with high-pressure air-conditioning system

The remote end of the control mechanism is respectively connected with the fixed seat, the threaded rod and the upper locking part and can be disengaged from the fixed seat, the threaded rod and the upper locking part, the control mechanism is used for conveying the clamping mechanism, the control mechanism is also used for controlling the upper locking part to move towards the elastic component so as to unlock the friction surface and controlling the threaded rod to rotate relative to the fixed seat so as to adjust the distance between the fixed seat and the connecting seat.

As one embodiment, the control mechanism includes: the wire releasing, the rotary driving assembly and the fixing seat connecting pipe are disconnected;

the far end of the fixing seat connecting pipe can be connected with the fixing seat to control the fixing seat, and the fixing seat connecting pipe can also withdraw from the fixing seat;

the rotary driving assembly penetrates through the fixing seat connecting pipe and the fixing seat and can axially move and circumferentially rotate along the fixing seat connecting pipe and the fixing seat; the distal end of the rotary driving assembly can be connected with the proximal end of the threaded rod and can drive the threaded rod to rotate relative to the fixed seat; the rotary driving assembly, the threaded rod and the upper locking part are provided with a release wire channel for the release wire to pass through, the release wire is arranged in the release wire channel in a penetrating way, the far end of the release wire extends into the upper locking part and is connected with the upper locking part, and the release wire can drive the upper locking part to move towards the elastic assembly; the release wire can also be released from the upper locking portion.

As one embodiment, the rotation driving assembly includes: a spring hose and a connecting rod coaxially connected from a distal end to a proximal end;

the connecting rod distal end is equipped with along the cross bead of axial extension, the threaded rod proximal end is equipped with along the cross recess of axial extension, cross recess with cross bead looks adaptation, so that pass through the connecting rod drive the threaded rod is rotatory.

As an embodiment, be equipped with the cotter way in the upper locking portion, be equipped with along radial extension's fixed pin in the cotter way, spring hose, connecting rod, threaded rod and upper locking portion has and link up to the release silk passageway of locating pin, release silk fifty percent discount back forms the lantern ring, the lantern ring cover is located the fixed pin just the both ends of release silk stretch out the spring hose proximal side.

As an embodiment, the fixing base connecting pipe comprises a cylindrical connecting pipe section and a plurality of connecting plates axially extending from the distal end of the connecting pipe section, a buckle is arranged at the outer side of the bottom end of the connecting plate, a clamping groove matched with the buckle is formed in the side wall of the fixing base, the connecting plates are folded inwards in a natural state and can be inserted into the fixing base, and the positions of the buckle and the clamping groove correspond to each other; the rotary driving assembly can drive the connecting plates to open when being inserted among the plurality of connecting plates of the fixed seat connecting pipe so that the buckle is clamped into the clamping groove, and can elastically recover to enable the buckle to be separated from the clamping groove when the rotary driving assembly exits from the fixed seat connecting pipe.

As an embodiment, the elastic assembly includes: the upper stop block, the elastic piece and the baffle are sequentially arranged in the connecting hole from the proximal end to the distal end; the elastic piece can elastically stretch and retract along the moving direction of the upper locking part;

the threaded rod comprises a threaded section and a smooth rod section which are sequentially connected from a proximal end to a distal end; the upper stop block, the elastic piece and the baffle are all provided with through holes for the smooth rod sections to pass through, and the length of the smooth rod sections is smaller than that of the elastic component in a natural state.

As one embodiment, the connecting hole is a rectangular through hole extending along the axial direction of the connecting seat;

optionally, the upper end surface of the upper stop block coincides with the upper end surface of the connecting seat, and the thread section of the threaded rod is stopped at the upper end surface of the upper stop block; the lower end face of the lower locking part coincides with the lower end face of the connecting seat.

As one embodiment, the lower end surface of the baffle plate and the upper end surface of the upper locking part are smooth surfaces;

optionally, the upper stop block and the lower locking part are welded or bonded with the connecting seat.

As an embodiment, the elastic piece is a U-shaped elastic piece;

optionally, the open end of the U-shaped spring is towards the upper stop.

As one embodiment, the distal end of the upper locking part is provided with a frustum-shaped part, the lower locking part is provided with a frustum-shaped groove matched with the frustum-shaped part, and the frustum-shaped part and the opposite surface of the frustum-shaped groove form the friction surface;

optionally, the friction surface is formed by sand blasting;

optionally, the external thread angle of the threaded rod is between 0 and 5 degrees.

According to the technical scheme, the invention has at least the following advantages and positive effects:

according to the valve repairing device provided by the embodiment of the invention, the internal threads of the fixing seat of the clamping mechanism are matched with the external threads of the threaded rod, the control mechanism drives the fixing seat to axially move relative to the threaded rod to control the opening and closing of the clamping mechanism, meanwhile, the threaded rod and the fixing seat can be locked through the threaded self-locking structure, and the threaded rod and the connecting seat are locked through 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, so that double locking in a threaded self-locking and friction locking mode is realized, and the failure risk is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being understood that the drawings in the following description are only embodiments of the present invention and that other drawings may be obtained according to the drawings provided without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an open valve repair device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a valve repair device according to an embodiment of the present invention in a closed state;

fig. 3 is a schematic structural view of a control mechanism of a valve repair device according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a clamping mechanism of a valve repair device according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a friction locking mechanism of a valve repair device according to an embodiment of the present invention;

fig. 6a is a schematic structural view of a connection seat of a valve repair device according to an embodiment of the present invention;

fig. 6b is a schematic cross-sectional view of a connecting seat of a valve repair device according to an embodiment of the present invention;

FIG. 7a is a schematic view of a threaded rod of a valve repair device according to an embodiment of the present invention;

FIG. 7b is a schematic cross-sectional view of a threaded rod of a valve repair device according to an embodiment of the present invention;

fig. 8a is a schematic structural view of a fixing seat of a valve repair device according to an embodiment of the present invention;

fig. 8b is a schematic cross-sectional view of a fixing seat of a valve repair device according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present invention, numerous technical details have been set forth in order to provide a better understanding of the present invention. However, the claimed invention may be practiced without these specific details and with various changes and modifications based on the following embodiments.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

It should be noted that, unless explicitly stated otherwise, the terms "connected," "connected," and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.

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

Referring to fig. 1 to 5, 6a and 6b, an embodiment of the present invention provides a valve repair device for interventional repair of a valve. The valve repair device of the present embodiment mainly includes: a control mechanism 1, a clamping mechanism 2 and a friction locking mechanism.

The clamping mechanism 2 comprises an upper clamping arm 201, a lower clamping arm 202, a connecting rod 203, a connecting seat 204, a threaded rod 205 and a fixing seat 206. The upper clamping arm 201 and the lower clamping arm 202 are respectively connected with a fixed seat 206, and the connecting rod 203 is connected with the lower clamping arm 202 and the connecting seat 204. The fixing base 206 is provided with internal threads, the threaded rod 205 is provided with external threads, and the fixing base 206 is in threaded fit with the threaded rod 205, namely, the fixing base 206 is sleeved on the threaded rod 205 and is in threaded connection with the threaded rod 205, and the threaded rod 205 and the fixing base 206 can realize axial relative movement through threaded fit and simultaneously can also be in threaded self-locking. The distal end of the threaded rod 205 is connected to the connection base 204 and is capable of rotating relative to the connection base 204 and axially limiting the connection base 204, so that the threaded rod 205 can freely rotate to achieve rotation relative to the fixed base 206 while the axial relative position to the connection base 204 remains unchanged. The lower clamping arm 202, the connecting rod 203, the connecting seat 204, the threaded rod 205 and the fixed seat 206 form a crank block mechanism, and the opening and closing of the valve clamps can be realized by operating the crank block mechanism so as to capture the valve leaflets and clamp the valve leaflets. When the threaded rod 205 is rotated to enable the fixing seat 206 to be far away from the threaded rod 205, the clamping mechanism 2 is opened, when the fixing seat 206 is close to the threaded rod 205, the clamping mechanism 2 can be closed and clamp the valve leaflets, and the threaded rod 205 and the fixing seat 206 can lock the clamping mechanism 2 through thread self-locking. The clamping mechanism 2 acts as a valve clamp for a long-term implant for treating valve regurgitation.

The friction locking mechanism includes an elastic component 300, the connecting seat 204 has a connecting hole 2041 extending along an axial direction, and the elastic component 300 is disposed in the connecting hole 2041. The proximal end of the elastic component 300 is fixedly connected with the proximal end of the connecting seat 204. The threaded rod 205 is disposed through the elastic component 300, and a distal end of the threaded rod 205 extends out of the elastic component 300 and is provided with an upper locking portion 304. Also provided in the coupling hole 2041 is a lower locking portion 306 opposite to the upper locking portion 304. The upper locking portion 304 and the lower locking portion 306 have opposite friction surfaces, and the elastic member 300 is elastically abutted against the upper locking portion 304 in a natural state and frictionally engages and locks the friction surfaces, so that the threaded rod 205 and the connection seat 204 are locked by friction force. When the friction surface is unlocked, the threaded rod 205 can rotate relative to the elastic component 300 and the connecting seat 205, and at this time, the threaded rod 205 can be rotated relative to the fixed seat 206 by operating the threaded rod 205 through the rotation driving component, so as to adjust the distance between the fixed seat 206 and the connecting seat 204, thereby adjusting the opening, closing and locking states of the valve clip.

The distal end of the control mechanism 1 is respectively connected with the fixing seat 206, the threaded rod 205 and the upper locking part 304, and the control mechanism 1 can be released from the fixing seat 206, the threaded rod 205 and the upper locking part 304, namely, after the valve clamp clamps the valve leaves and locks, the control mechanism 1 and the clamping mechanism 2 can be released, and the control mechanism 1 is withdrawn from the body, so that only the clamping mechanism 2 is implanted into the body. The control mechanism 1 is also used for transporting the clamping mechanism 2, i.e. the clamping mechanism 2 to the target treatment site. The control mechanism 1 is further configured to control the movement of the upper locking portion 304 towards the elastic member 300 to unlock the friction surface, and when the upper locking portion 304 moves towards the elastic member 300 (i.e. proximally), the elastic member 300 may be elastically contracted by force, so that a gap is generated between the friction surfaces of the upper locking portion 304 and the lower locking portion 306, and thus the friction surface is unlocked, i.e. the upper locking portion 304 may rotate relative to the lower locking portion 306. The control mechanism 1 is further used for controlling the threaded rod 205 to rotate relative to the fixed seat 206 so as to adjust the distance between the fixed seat 206 and the connecting seat 205. Therefore, the clamping state of the valve clamp can be double-locked through the thread 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, so that the risk of failure in locking the valve clamp is further reduced.

Referring to fig. 3, the control mechanism 1 includes a releasing wire 101, a rotary driving assembly and a fixing base connecting tube 103.

The distal end of the holder connection tube 103 can be connected to the holder 206 to control the holder 206, and the holder connection tube 103 can also exit the holder 206.

Referring to fig. 8a and 8b, the fixed connection tube 103 includes a cylindrical connection tube 1031 and a plurality of connection plates 1032 extending axially from the distal end of the connection tube 1031. The rotary driving assembly can penetrate into the fixed seat connecting pipe 103 and can axially move and circumferentially rotate in the fixed seat connecting pipe 103. The outside of the bottom end of the connecting plate 1032 is provided with a buckle 1033, the side wall of the fixed seat 206 is provided with a clamping groove 2062 which is matched with the buckle 1033, the connecting plate 1032 is folded inwards in a natural state and can be inserted into the fixed seat 206, the positions of the buckle 1033 and the clamping groove 2062 correspond to each other, the rotating driving assembly can drive the connecting plate 1032 to open when being inserted between a plurality of connecting plates 1032 of the fixed seat connecting pipe 103 so that the buckle 1033 is clamped into the clamping groove 2062 of the fixed seat 206, and the connecting plate 1032 can elastically recover when the rotating driving assembly exits the fixed seat connecting pipe 103 so that the buckle 1033 is separated from the clamping groove 2062.

The number of the connecting plates 1032 can be two, and the connecting plates are arranged in an axisymmetric mode. The connecting plate 1032 is heat-set and then bent inwards in a natural state, so that the fixing base connecting pipe 103 can be inserted into the fixing base 206 from the top end, and the position of the buckle 1033 corresponds to that of the clamping groove 2062, but the buckle 1033 is not embedded into the clamping groove 2062 in a natural state, and at this time, the fixing base connecting pipe 103 can be still pulled out from the fixing base 206. Rectangular clamping grooves 2062 are symmetrically arranged on two sides of the top of the fixed seat 206. When the rotation driving assembly is inserted between the two connection plates 1032 of the fixing base connection pipe 103, the rotation driving assembly pushes the buckles 1033 on the two connection plates 1032 into the clamping grooves 2062 of the fixing base 206, so that the fixing base connection pipe 103 is fixedly connected with the fixing base 206. After the rotary driving assembly is drawn out from the fixing base connecting pipe 103, the two connecting plates 1032 of the fixing base connecting pipe 103 are bent inwards and folded under the action of self elastic restoring force, so that the buckle 1033 at the end of the connecting plate 1032 is driven to be separated from the clamping groove 2062 of the fixing base 206, and the fixing base connecting pipe 103 can be drawn out from the fixing base 206.

The rotation driving component is arranged through the fixing base connecting pipe 103 and the fixing base 206 in a penetrating way, and can axially move and circumferentially rotate along the fixing base connecting pipe 103 and the fixing base 206. The distal end of the rotational drive assembly can be coupled to the proximal end of the threaded rod 205 and can drive the threaded rod 205 to rotate relative to the stationary seat 206. The rotation driving assembly, the threaded rod 205 and the upper locking portion 304 are provided with a releasing wire channel for the releasing wire 101 to pass through, the releasing wire 101 penetrates into the releasing wire channel, the distal end of the releasing wire 101 can extend into the upper locking portion 304 and be connected with the upper locking portion 304, and the releasing wire 101 can drive the upper locking portion 304 to move towards the elastic assembly 300. The trip wire 100 can also be tripped from the upper locking portion 304. The fixing seat 206 can be controlled through the fixing seat connecting pipe 103, meanwhile, the threaded rod 205 is driven to rotate through the rotary driving assembly, the threaded rod 205 is driven to move relative to the fixing seat 206, opening and closing of the valve clamp are achieved, and the clamping state of the valve clamp can be automatically locked.

Referring to fig. 3, 7a and 7b, the rotation driving assembly may include: a spring hose 102 and a connecting rod 104 coaxially connected from distal to proximal. The distal end of the connecting rod 104 is provided with an axially extending cross rib 1041, the proximal end of the threaded rod 205 is provided with an axially extending cross groove 2052, and the cross groove 2052 is adapted to the cross rib 1041 to drive the threaded rod 205 to rotate through the connecting rod 104. It will be appreciated that other suitable arrangements for driving the rotation of the threaded rod 205 are possible for the connecting rod 104, such as a linear rib, and accordingly, the threaded rod 205 has a linear groove adapted to the linear rib. The transmission matching structure between the connecting rod 104 and the threaded rod 205 is not particularly limited in this embodiment, 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 may be fixedly connected coaxially by welding or bonding, so that the spring hose 102 can drive the connecting rod 104 to rotate. The spring hose 102 has certain elasticity and rotatability, and the spring hose 102 drives the connecting rod 104 to rotate, and then drives the threaded rod 205 to rotate, so that the acting force of the operation can be fed back.

The upper locking portion 304 is provided with a pin groove therein, and a fixing pin 305 extending in a radial direction is provided in the pin groove. The spring hose 102, the connecting rod 104, the threaded rod 205 and the upper locking portion 304 have a release wire passage through to the securing pin 305. Wherein the connecting rod 104 and the threaded rod 205 each have a through hole. The release wire 101 is folded in half to form a collar 1011, the collar 1011 is sleeved on the fixed pin 305, two ends of the release wire 1011 extend out of the proximal end side of the spring hose 102, namely, one end of the release wire 101 penetrates into the release wire channel to reach the fixed pin 305 and then is folded back from the release wire channel, two ends of the release wire 101 are exposed out of the outer end of the spring hose 102, so that the release wire can be connected with an external operation handle, and tension is applied to the upper locking part 304 through the release wire 101 and the fixed pin 305, so that the friction surface of the upper locking part 304 is separated from the friction surface of the lower locking part 306. The fixing pin 305 may be provided at a middle position of the upper locking part 304, and a through hole extending in a radial direction is processed at a middle position of the upper locking part 304 for mounting the fixing pin 305.

Referring to fig. 5, the elastic member 300 may include an upper stopper 301, an elastic member 302 and a baffle 303 disposed in the connecting hole 2041 in sequence from the proximal end to the distal end. The elastic member 302 is elastically stretchable in the moving direction of the upper locking portion 304. Threaded rod 205 includes a threaded section 2051 and a smooth rod section 2053 that are connected in sequence from a proximal end to a distal end. The upper stop 301, the elastic member 302 and the baffle 303 are all provided with through holes for the smooth rod segments 2053 to pass through, and the length of the smooth rod segments 2053 is smaller than that of the elastic assembly 300 in a natural state.

The smooth tube segment 2053 of the threaded rod 205 is cylindrical. The upper stop block 301, the elastic member 302 and the baffle 303 are all provided with circular through holes, and the circular through holes of the upper stop block 301, the elastic member 302 and the baffle 303 are coaxially arranged, and the diameter of the circular through holes can be slightly larger than that of the smooth rod section 2053, so that the smooth rod section 2053 can freely rotate relative to the elastic component. The distance between the upper end surface of the upper locking portion 304 and the upper end surface of the elastic component 300 is the length of the smooth rod segment 2053, and since the length of the smooth rod segment 2053 is smaller than the length of the elastic component 300 in the natural state, the elastic component 300 is always subjected to a compressive force, which is the same as the compressive force of the elastic component 300 acting on the upper locking portion 304, so that the friction surfaces of the upper locking portion 304 and the lower locking portion 306 can be tightly contacted and frictionally engaged, and the friction locking of the threaded rod 205 and the connecting seat 204 can be realized. When the trip wire 101 pulls the fixing pin 305, the elastic assembly 300 is further compressed, so that the upper locking part 304 is slightly moved upward to enable the upper locking part 304 to axially generate a gap with the lower locking part 306, so that friction surfaces of the upper locking part 304 and the lower locking part 306 are not contacted any more, thereby enabling the threaded rod 205 to axially rotate relative to the connection seat 204.

The thread 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 small, the distance that the threaded rod 205 moves axially in one rotation is small, so that the clamping state can be accurately adjusted and the risk of thread self-locking failure can be reduced.

The elastic member 302 may be a U-shaped spring. Illustratively, the open end of the U-shaped spring may be directed toward the upper stop 301, or the open end of the U-shaped spring may be directed toward the baffle 303. The U-shaped spring needs to have a certain width, so that after the U-shaped spring is elastically deformed, enough supporting force can be provided, so that the baffle 303 applies enough force to push the upper locking portion 304, and friction surfaces of the upper locking portion 304 and the lower locking portion 306 are always in close contact and in friction engagement, so that a good locking state is maintained. The U-shaped elastic sheet can be made of nickel-titanium alloy materials. The friction locking mechanism 3 controls the friction engagement state of the upper locking part 304 and the lower locking part 306 through the material characteristics of the U-shaped elastic sheet, and has high reliability and transmission efficiency. It will be appreciated that other configurations of the resilient member 302 are possible, as long as the positive friction locking requirements are met.

The distal end of the upper locking portion 304 has a frustoconical portion and the lower locking portion 306 has a frustoconical recess that mates with the frustoconical portion, the opposing surfaces of the frustoconical portion and the frustoconical recess forming a friction surface. The friction locking of the upper locking portion 304 and the lower locking portion 306 is made more stable and reliable by the frustoconical friction surface. The friction surfaces of the upper and

lower locking portions

304 and 306 may be formed by sand blasting so that both have a good coefficient of friction.

The lower end surface of the baffle 303 and the upper end surface of the upper locking portion 304 are smooth surfaces, so that the friction force between the elastic assembly 300 and the upper locking portion 304 is small, and the upper locking portion 304 can freely and flexibly rotate relative to the elastic assembly 300. The baffle 303 may be made of a rigid material that provides little deformability.

Illustratively, the coupling hole 2041 of the coupling seat 204 may be a rectangular through hole extending axially along the coupling seat 204. It is understood that the connecting hole 2041 may be other polygonal through holes, or other shaped through holes.

The threaded rod 205 and the upper locking portion 304 may be welded or glued and ensure that the two are coaxial. Both the upper stop 301 and the lower locking portion 306 may be welded or glued to the connector base 204. The upper end surface of the upper stopper 301 coincides with the upper end surface of the connection seat 204, and the thread segment 2051 of the threaded rod 205 is stopped at the upper end surface of the upper stopper 301. The lower end surface of the lower locking portion 306 coincides with the lower end surface of the connection seat 204.

The number of upper arms 201, lower arms 202, and links 203 is 2, but the present invention is not limited thereto, and may be 3 in some examples. The upper clip arm 201 is snapped onto the fixing base 206 and fixedly connected to the fixing base 206 after being shaped by heat treatment. The two sides of the upper clamping arm 201 are respectively provided with a traction wire, and the traction wires are tensioned through an external handle, so that clamping plates at the two sides of the upper clamping arm 201 are attached to the fastening fixing seat 206. The connecting rod 203 is connected with the connecting seat 204, the connecting rod 203 is connected with the lower clamping arm 202 and the lower clamping arm 202 is connected with the fixing seat 206 through pin shafts or rivets. It is to be understood that the shape, structure and connection manner of the upper arm 201, the lower arm 202, the link 203, etc. of the clamping mechanism 2 are not particularly limited.

In the embodiment of the invention, the upper clamping arm 201 and the U-shaped elastic sheet are preferably made of nickel-titanium alloy materials, and the release wire 101 is made of wear-resistant polymer wires such as polyethylene; the rest parts are preferably cobalt-chromium alloy, titanium-based alloy or 316L stainless steel material.

Referring to fig. 1 to 5, the working principle of the valve repair device of the present embodiment is illustrated below.

In the embodiment of the invention, the valve repairing device is in a closed state as shown in fig. 2 in an initial state, two ends of the release wire 101 are fixedly connected with the external control handle, the proximal end of the spring hose 102 is fixedly connected with the external control handle, the spring hose 102 and the release wire 101 can be controlled by independent handles respectively or can be controlled by the same handle, and the purpose of the valve repairing device is to conveniently control the spring hose 102 and the release wire 101 to synchronously rotate. The proximal end of the fixed seat connecting tube 103 is fixedly connected with the delivery sheath.

During delivery, the valve repair device maintains the condition shown in fig. 2. When the valve leaf is reached, the release wire 101 is pulled by the external handle, so that the fixing pin 305 drives the upper locking part 304 and the baffle 303 to move proximally, and the elastic piece 302 is deformed. The frustoconical roughened surface of the upper locking segment 304 is now separated from the roughened surface of the frustoconical recess of the lower locking segment 306; the external handle drives the release wire 101 and the spring hose 102 to synchronously rotate, so that the connecting rod 104 and the threaded rod 205 are driven to synchronously rotate, the fixed seat 206 moves proximally along the threaded rod 205 (away from the connecting seat 204), and the lower clamping arm 202 is gradually opened. Distally delivering the valve clip such that the leaflets ride on the lower clip arms 202; releasing the traction wire of the upper clamping arm 201 through an external control handle, so that the upper clamping arm 201 is restored to a heat setting shape, and the upper clamping arm 201 and the lower clamping arm 202 clamp the valve leaflet; again by operating the external handle, the trip wire 101 and the spring hose 102 are rotated in opposite directions, such that the fixing base 206 moves distally along the threaded rod 205 (even if the fixing base 206 approaches the connecting base 204), and the lower clamp arm 202 gradually closes to complete the leaflet clamping.

After confirming that the clamping state of the valve leaflet meets the requirement, the release wire 101 is released through the external handle, and the elastic piece 302 is restored to the heat setting state to push the baffle 303 and the upper locking block 304 to move distally, so that the conical rough surface at the far end of the upper locking part 304 is tightly attached to the rough surface of the conical table groove at the near end of the lower locking part 306. In this state, the rotational friction between the two roughened surfaces is greater than the rotational driving force applied by the handle or leaflet, upper clip arm 201, thereby maintaining the stable gripping state of the clip, which is no longer closed or open.

After confirming that the valve clamp has completed clamping the valve leaflet, one end of the release wire 101 can be pulled out from the handle until the release wire 101 is completely withdrawn; then the spring hose 102 is retracted from the handle end, so that the connecting rod 104 moves proximally until the connecting rod 104 is retracted into the sheath; finally, the connecting plate 1032 at the distal end of the fixing base connecting tube 103 loses the support of the connecting rod 104, returns to the heat-set internal buckling shape, and the buckling 1033 of the connecting plate 1032 is disengaged from the clamping groove 2062 of the fixing base, so that the fixing base connecting tube 103 is separated from the fixing base 206. Thus, the valve clip is released, and the delivery sheath can be withdrawn from the body.

The embodiment of the invention can complete the movement of the fixing seat 206 along the threaded rod 205 through external rotation driving. And the present invention controls the frictional locking state of the upper locking part 304 and the lower locking part 306 depending on the material characteristics of the elastic member 302; compared with thread self-locking, the thread self-locking device has higher reliability and transmission efficiency. And moreover, the operation is simple, the operation efficiency is high, the release mode can be repeatedly operated, and the risk caused by misoperation in the operation is avoided.

Based on the technical scheme, the invention has at least the following advantages and positive effects:

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. A valve repair device, comprising:

the clamping mechanism comprises an upper clamping arm, a lower clamping arm, a connecting rod, a connecting seat, a threaded rod and a fixing seat; the upper clamping arm and the lower clamping arm are respectively connected with the fixed seat, and the connecting rod is connected with the lower clamping arm and the connecting seat; the fixing seat is provided with an internal thread, the threaded rod is provided with an external thread, and the fixing seat is in threaded fit with the threaded rod; the distal end of the threaded rod is connected with the connecting seat, can rotate relative to the connecting seat and is limited with the connecting seat axially; the lower clamping arm, the connecting rod, the connecting seat, the threaded rod and the fixing seat form a crank slide block mechanism;

2. The valve repair device of claim 1, wherein the control mechanism comprises: the wire releasing, the rotary driving assembly and the fixing seat connecting pipe are disconnected;

3. The valve repair device of claim 2, wherein the rotational drive assembly comprises: a spring hose and a connecting rod coaxially connected from a distal end to a proximal end;

4. The valve repair device of claim 3, wherein the upper locking portion is provided with a pin slot therein, a radially extending fixing pin is provided in the pin slot, the spring hose, the connecting rod, the threaded rod and the upper locking portion are provided with a release wire passage penetrating through the limiting pin, the release wire is folded in half to form a collar, the collar is sleeved on the fixing pin, and two ends of the release wire extend out of the proximal end side of the spring hose.

5. The valve repair device according to claim 2, wherein the fixing seat connecting tube comprises a cylindrical connecting tube section and a plurality of connecting plates extending axially from the distal end of the connecting tube section, a buckle is arranged at the outer side of the bottom end of the connecting plate, a clamping groove matched with the buckle is arranged on the side wall of the fixing seat, the connecting plates are folded inwards in a natural state and can be inserted into the fixing seat, and the positions of the clamping grooves correspond to those of the clamping grooves; the rotary driving assembly can drive the connecting plates to open when being inserted among the plurality of connecting plates of the fixed seat connecting pipe so that the buckle is clamped into the clamping groove, and can elastically recover to enable the buckle to be separated from the clamping groove when the rotary driving assembly exits from the fixed seat connecting pipe.

6. The valve repair device of claim 1, wherein the elastic assembly comprises: the upper stop block, the elastic piece and the baffle are sequentially arranged in the connecting hole from the proximal end to the distal end; the elastic piece can elastically stretch and retract along the moving direction of the upper locking part;

7. The valve repair device of claim 6, wherein the connection aperture is a rectangular through-hole extending axially along the connection seat;

8. The valve repair device of claim 6, wherein a lower end surface of the baffle and an upper end surface of the upper locking portion are both smooth surfaces;

9. The valve repair device of claim 6, wherein the elastic member is a U-shaped spring;

optionally, the open end of the U-shaped spring is towards the upper stop.

10. The valve repair device of any one of claims 1 to 9, wherein the upper locking portion distal end has a frustoconical portion, the lower locking portion having a frustoconical recess conforming to the frustoconical portion, the frustoconical portion and an opposing surface of the frustoconical recess constituting the friction surface;

optionally, the friction surface is formed by sand blasting;