Anti-downward migration chordal repair device

Abstract

The present invention discloses a chord repair device that prevents downward movement, comprising: a rotary disk for gathering chordae tendineae, wherein the distal end of the rotary disk is connected to an elastic ring that prevents the chord repair device from moving downward; the elastic ring has a plurality of coils of elastic spiral rings that spirally extend from the elastic point toward the distal end, and the spiral angle of the elastic ring is greater than the spiral angle of the rotary disk. The present invention provides an elastic ring with a large spiral angle Φ at the distal end of the rotary disk of the chord repair device, thereby allowing the distal end of the chord repair device to have a certain height or thickness. During the opening and closing process of the leaflet, when the rotary disk moves downward and approaches the papillary muscle, the presence of the elastic ring with a certain height or thickness can push the rotary disk to a suitable position on the length of the chordae tendineae, so that the rotary disk does not move downward and deviate from reaching the upper end of the chordae tendineae, thereby effectively improving the efficiency of chord repair.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a tendon chord repair device that prevents downward movement. Background Art

[0002] The heart's primary function is to guide blood flow into and out of its chambers by contracting or expanding the corresponding valves, opening or closing them. The tricuspid valve, located between the right atrium and right ventricle, functions properly. A normal tricuspid valve ensures that incoming blood flows from the right atrium to the right ventricle and prevents backflow.

[0003] Functional tricuspid regurgitation is often caused by valvular disease in the left heart system, leading to left atrial enlargement, which in turn causes pulmonary hypertension and right ventricular enlargement. This in turn causes the tricuspid annulus to expand, altering the mechanical direction of the chordae tendineae pulling on the valve, resulting in poor leaflet coaptation and tricuspid regurgitation. When moderate to severe tricuspid regurgitation is present before surgery, the tricuspid valve apparatus inevitably exhibits significant pathological structural changes.

[0004] Currently, the commonly used methods for repairing the tricuspid valve are edge-to-edge repair and repair through chordae tendineae. Among them, chordae tendineae repair is less damaging to the heart valve because it is in soft contact with the chordae tendineae and does not completely restrict their movement. However, existing chordae tendineae generally use a spiral winding method to gradually gather the chordae tendineae near the center of the spiral disk to repair the tricuspid valve. For example, publication numbers CN110352045A, CN106901875B, and CN107072782B all involve tricuspid valve regurgitation repair devices with a spiral winding method. However, during the later use of these devices, during the opening and closing of the valve leaflets, there is a technical problem that the repair device will be driven to move downward. Therefore, it is necessary to improve it. Summary of the Invention

[0005] The present invention addresses the technical problem in the prior art that the repair device will be driven to move downward during the opening and closing of the leaflet, and aims to provide a chordal repair device that can prevent downward movement, including: a rotary disk for gathering the chordae tendineae, the chordal repair device also having an elastic ring for preventing the chordal repair device from moving downward, and the elastic ring is connected to the distal end of the rotary disk.

[0006] The rotary disk further has an elastic point, and the elastic point is connected to the elastic ring toward the distal end. Preferably, the elastic point is integrally extended with the elastic ring toward the distal end.

[0007] Preferably, the elastic ring has a plurality of spiral rings extending spirally from the elastic point toward the distal end, and the spiral angle of the elastic ring is greater than the spiral angle of the rotating disk. Preferably, the spiral angle Φ of the elastic ring is 8° to 15°.

[0008] Preferably, the center of the turntable has a disk center, and the turntable has a plurality of disk rings spirally extending from the disk center with a gradually increasing first radius in the radial direction, and the gaps between adjacent disk rings form a disk path.

[0009] Preferably, the elastic spiral ring extends out of the elastic ring with a first radius that gradually increases in accordance with the turntable starting from the elastic point, that is, when viewed from the proximal end to the distal end, the extension direction of the elastic ring overlaps with that of the turntable.

[0010] Preferably, the number of turns of the spring ring is smaller than the number of turns of the disk ring, that is, when viewed from the proximal end to the distal end, the spring ring is completely covered by the disk.

[0011] Preferably, the elastic ring forms an elastic path, and the elastic path is consistent with the extension direction of the disk path.

[0012] Preferably, the diameter of the spring spiral ring is smaller than the diameter of the disk ring of the rotating disk. The spring point can coincide with the disk center, or there is a certain distance between the spring point and the disk center.

[0013] Preferably, the tendon repair device also has a connector, the connector has a connecting rod, the distal end of the connecting rod is connected to the proximal end of the turntable, and the end face of the proximal end of the connecting rod continues to extend along the axial surface to form a horizontal plate for clamping.

[0014] Preferably, the center of the turntable has a disk core, and the distal end of the connecting rod is integrally connected to the proximal end of the disk core of the turntable.

[0015] Preferably, one side of the transverse plate is connected to the end face of the connecting rod.

[0016] Preferably, one side edge of the transverse plate is integrally formed on the end surface of the connecting rod.

[0017] Preferably, a pair of center columns extend from the centers of the two side surfaces of the transverse plate.

[0018] Preferably, the side surface of the centering column is integrally formed on the side surface of the transverse plate.

[0019] Preferably, a bottom surface of the centering column and an end surface of the connecting rod are integrally formed.

[0020] Preferably, the centering column is an arc column, an elliptical column, a square column or a prism.

[0021] Preferably, a pull wire through hole is provided at the proximal end of the transverse plate.

[0022] Preferably, the angle between the connecting rod and the axis of the rotating disk is 0-15°.

[0023] In a preferred embodiment of the present invention, the turntable has a primary spiral structure in the radial direction, and the turntable also has a secondary spiral structure in the axial direction.

[0024] Preferably, the turntable has a center, and the turntable radially extends spirally with the center as a starting point and a gradually increasing first radius as a radius to form the primary spiral structure.

[0025] Preferably, the rotating disk radially extends a plurality of primary disk rings spirally with a disk center as the starting point and a gradually increasing first radius as the radius to form the primary spiral structure, and the gaps between adjacent primary disk rings form a disk path.

[0026] Preferably, the turntable spirally extends with the spiral line of the primary spiral structure as the axis and the second spiral pitch angle as the angular rate to form the secondary spiral structure.

[0027] Preferably, the rotating disk spirally extends a plurality of secondary disk rings with the spiral line of the primary spiral structure as the axis, the second radius as the radius, and the second spiral rise angle as the angular rate to form the secondary spiral structure.

[0028] Preferably, the turning disk takes the spiral line of the primary spiral structure as the axis, the middle point of the spiral line as the starting point, the second radius as the radius, and the second spiral rise angle as the angular rate to spirally extend a plurality of secondary disk rings to form the secondary spiral structure.

[0029] Preferably, the average value of the first radius is 5 to 50 times the average value of the second radius.

[0030] The positive progress effect of the present invention is:

[0031] 1) The present invention provides a chord repair device with a distal end having a certain height or thickness by disposing an elastic ring with a large helical pitch angle Φ at the distal end of the disc. During the opening and closing of the valve leaflet, when the disc moves downward toward the papillary muscle, the presence of the elastic ring with a certain height or thickness can push the disc to an appropriate position along the chordal length, preventing the disc from moving downward and losing access to the upper chordal end. This effectively improves the efficiency of chordal repair. Furthermore, because the spiral path of the elastic ring and the disc's coiling ring are completely aligned, the elastic ring's elastic path and the disc's coiling path are also completely aligned. When the chordal tendons are retracted, the coiling path can be inserted into the elastic path without being obstructed by the elastic ring's elastic ring. Furthermore, the diameter of the elastic ring's elastic ring is smaller than the diameter of the coiling ring, further reducing obstruction and allowing the chordal tendons to pass freely through the elastic path. Furthermore, the elastic ring and the disc's paths align in direction, allowing them to expand together, facilitating placement into the delivery system for transport.

[0032] 2) The tendon repair device of the present invention is provided with a coupler for connecting to a conveyor at the proximal end of the rotary disk. The coupler has an axially connected transverse plate, which is axially engaged and inserted into the distal end of the coupler. This engagement is secure and reliable, preventing the tendon repair device from idling when transported by the conveyor. When the rotary disk is rotated, the tendons can be well gathered within the disk path of the rotary disk, preventing slippage and idling between the distal end of the conveyor and the coupler. Furthermore, because the centers of both side surfaces of the transverse plate have centering columns, and when the transverse plate is axially engaged and inserted into the distal end of the conveyor, the entire rotary disk is inserted into the distal end of the conveyor in a centered and aligned manner, ensuring the stability and accuracy of the delivery of the tendon repair device.

[0033] 3) The turntable of the tendon repair device of the present invention not only has a conventional primary spiral structure on the radial surface, but also has a secondary spiral structure one level higher on the axial surface perpendicular to the radial surface. During the opening and closing process of the valve leaflet, due to the existence of the secondary spiral structure, the elasticity of the secondary spiral structure can greatly cushion the collision between the outer ring of the turntable and the inner wall of the heart, thereby reducing damage to the heart. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the three-dimensional structure of the tendon repair device of the present invention;

[0035] Figure 2A Schematic diagram of the primary spiral structure of the turntable 10 of the present invention;

[0036] Figure 2B Schematic diagram of the secondary spiral structure of the turntable 10 of the present invention;

[0037] Figure 2C This is an enlarged view of a portion of the secondary spiral structure of the turntable 10 of the present invention;

[0038] Figure 2D It is a side structural diagram of the secondary spiral structure of the turntable 10 of the present invention;

[0039] Figures 2E to 2F This is a structural diagram of the starting point position of the secondary spiral structure of the turntable 10 of the present invention;

[0040] Figure 3A This is a schematic structural diagram showing the elastic ring 20 from the side of the tendon repair device of the present invention;

[0041] Figure 3B for Figure 3A A top view of

[0042] Figure 3C for Figure 3A Bottom view of

[0043] Figures 3D-3EA schematic diagram of the elastic ring and the rotating disk being stretched together;

[0044] Figure 4 for Figure 3A An enlarged schematic diagram of the coupling 30;

[0045] Figure 5A A working process state diagram of the tendon repair device of the present invention;

[0046] Figure 5B This is a working process state diagram of the tendon repair device of the present invention. DETAILED DESCRIPTION

[0047] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0048] It should be noted that the terms "distal" and "proximal" are used in this invention as directional terms, which are commonly used in the field of interventional medical devices. "Distal" refers to the end away from the operator during surgery, while "proximal" refers to the end closer to the operator during surgery. "Radial" refers to the direction of the plane of the rotating disk. "Axial" refers to the direction perpendicular to the plane of the rotating disk.

[0049] like Figure 1 The chord repair device of the present invention is shown to have a rotary disk 10 , an elastic ring 20 and a connector 30 .

[0050] like Figure 2A As shown, the turntable 10 of the present invention has a primary spiral structure in the radial direction. The primary spiral structure can be a spiral ascending structure, that is, the spiral rise angle Φ1 is a positive angle, the spiral rise angle Φ1 can be any angle, and a better angle can be, for example, 0 to 10°, preferably 0 to 5°. It can also be an approximate spiral plane structure, that is, the spiral rise angle Φ1 can be 0, or it can be a spiral descending structure, that is, the spiral rise angle Φ1 is a negative angle, and the descending spiral rise angle Φ1 can also be any angle, and a better angle can be, for example, 0 to -10°, preferably 0 to -5°. Any structure that can gather the tendons can be used as the turntable structure of the present invention, and no specific structure is limited here.

[0051] As an example, this embodiment is illustrated by taking a turntable with a first-level spiral structure that is approximately flat. The turntable 10 has a center 10a in the radial direction. The turntable 10 spirally extends a plurality of first-level disk rings 11 in the radial direction with the center 10a as the starting point and a first radius r1 that gradually increases as the radius. The first radius r1 gradually increases as the spiral extends. The rate of increase, that is, the acceleration rate of radius growth, can be the same or different, as long as it shows an increasing trend overall. The starting radius of the first radius r1 can start from 0, of course, the starting radius can also start from a positive number that is not 0. The number of turns of the spirally extended first-level disk ring can be any number, for example, it can be 3 to 5 turns. In this way, a first-level spiral structure is formed.

[0052] As the primary rings 11 of the rotating disk 10 spiral, the gaps between adjacent primary rings 11 naturally form a disk path 12. Path 12 begins at starting point 12a, near the outermost end of the primary rings 11, and spirals inward to the disk center 10a, where it terminates. The chordae tendineae of the heart valves are drawn into disk path 12 from starting point 12a, drawn by the outermost end of the primary rings 11, like a safety helmet, from the beginning. They then continue along disk path 12, slowly converging toward the center until they converge at the disk center.

[0053] As an example, the terminal end of the primary spiral of primary ring 11 may be provided with a protective member, such as a safety cap (not shown). Alternatively, the distal end of primary ring 11 may be bent outward or inward to form a blunt tip, thereby preventing the primary ring 11 from damaging the tendons due to a sharp tip when the primary ring 11 is wound around them. The safety cap may be welded, threaded, or snap-fitted to the distal end of primary ring 11.

[0054] After the chordae tendineae repair device retracts the chordae tendineae, during the opening and closing movement of the heart valve, the outer ring of the primary disk ring 11 of the rotating disk 10 will inevitably collide with the inner wall of the heart, causing damage to the heart. Figures 2B to 2FAs shown, the turntable 10 of this embodiment further comprises a secondary spiral structure in a direction perpendicular to the radial surface. For example, the secondary spiral structure spirally extends a plurality of secondary rings 13 around the spiral line of the primary spiral structure, with a second radius r2 as the radius and a second spiral pitch angle Φ2 as the angular velocity, thereby forming a secondary spiral structure. The secondary spiral structure can start from the starting point of the spiral line of the primary spiral structure, i.e., the center 10a of the disk, or from a point in the middle of the spiral line of the primary spiral structure. In this case, the middle point of the spiral line of the primary spiral structure is referred to as the midpoint 11b. Of course, the secondary spiral structure can also start from the outermost two turns of the primary spiral structure and continue to the end of the primary spiral structure. The second radius r2 can be a fixed radius or a slightly variable radius. Any radius is acceptable, as long as it is not greater than the first radius r1 of the corresponding point on the spiral line. Preferably, the average value of the first radius r1 is 5 to 50 times the average value of the second radius r2. The second helix angle Φ2 can be any angle, which can be positive or negative. Preferably, the second helix angle Φ2 is 60°≤Φ2<90° (90° indicates that the secondary helical structure does not exist, but the helix angle of the secondary helical structure can be infinitely close to 90°).

[0055] like Figures 3A to 3C As shown, after the chordal repair device retracts the chordae tendineae, the heart valve's opening and closing motion inevitably causes the repair device to move toward the inferior papillary muscles, causing the disc 10 to lose its proper position along the length of the chordae tendineae. To address this issue, this example further includes an elastic ring 20 to prevent the chordal repair device from moving downward. The elastic ring 20 is attached to the distal end of the disc 10, and preferably extends integrally toward the distal end.

[0056] In one example, the elastic ring 20 includes multiple spiral rings 21 that can spirally extend from the center 10a of the disk 10 toward the distal end, or from a starting point 10b a certain distance from the center 10a. The spiral rings 21 spirally extend from the disk 10 at a predetermined pitch angle φ3, with a first radius that gradually increases from corresponding points on the disk 10. A corresponding point is defined as a point on the elastic ring where, when viewed from the distal end toward the proximal end, the projection of the projection coincides with a point on the disk.

[0057] The spring-loaded spiral ring 21 spirally extends with a first, gradually increasing radius consistent with the corresponding point on the disk 10. This means that the starting radius and radius growth rate of the corresponding point at the disk center 10a or the spring-loaded starting point 10b are consistent. That is, the first radius r1, which is the same as that of the disk 10, gradually increases as the spiral extends, and the rate of increase, or the acceleration rate of radius growth, remains consistent with the corresponding point on the disk 10. In other words, in the projection direction, the radius of the spring-loaded spiral ring 21 at the corresponding projection point is the same as the radius of the primary ring 11, including the direction of the tangent to the radius at this point. This ensures that the spring-loaded spiral ring 20 and the disk 10 completely overlap in their extension direction, i.e., projection, when viewed from the proximal end toward the distal end. The spring-loaded spiral ring 21 spirally extended from the spring-loaded spiral ring 20 can have any number of turns, for example, 3 to 5, but the total number of turns of the spring-loaded spiral ring 21 does not exceed the number of turns of the primary ring 11 on the disk 10, for example, 2 to 4. The ring diameter of the elastic screw ring 21 (i.e., the ring thickness of the elastic screw ring 21, i.e., the thickness of the elastic ring spiral line) is smaller than the ring diameter of the disk ring 11 of the rotating disk 10 (i.e., the ring thickness of the disk ring 11, i.e., the thickness of the disk ring spiral line). When the number of turns and the ring diameter (i.e., the ring thickness) of the elastic screw ring 21 are both smaller than those of the disk ring 11, that is, when viewed from the proximal end to the distal end, the elastic ring 20 is completely covered by the rotating disk 10.

[0058] As an example, a protective member, such as a safety cap 23, can be provided at the terminal end of the spring screw ring 21 by bending the distal end of the spring screw ring 21 outward or inward to form a blunt tip. This prevents the sharp tip of the spring screw ring 21 from damaging the tendon when it is wound around the tendon. The safety cap can be welded, threaded, or snap-fitted to the terminal end of the spring screw ring 21.

[0059] In this case, due to the spiral extension of the elastic ring 20, the gaps between adjacent elastic spiral rings 21 naturally form an elastic path 22. Since the elastic ring 20 maintains the same radius and spiral direction as the rotating disk 10, the elastic path 22 also maintains the same extension direction as the disk path 12. The direction of the elastic path 22 starts from the starting point 22a of the elastic path 22. When the number of turns of the elastic spiral ring 21 is the same as the number of turns of the disk ring 11, the projection of the starting point 22a of the elastic path 22 is at the starting point 12a of the disk path 12. When the number of turns of the elastic spiral ring 21 is less than the number of turns of the disk ring 11, the projection of the starting point 22a of the elastic path 22 is at the corresponding projection point on the disk path 12. The end point of the elastic path 22 is the starting point 10b.

[0060] With this design, as the tendons are gradually retracted within the disk path 12 of the turntable 10, the tendons will also pass through the elastic path 22, which has the same path as the distal end. The elastic spiral ring 21 will not hinder the operation of the tendons being retracted by the turntable. When the elastic point 10b does not coincide with the disk center 10a, the tendons can still be retracted and approached to the disk center 10a. The elastic ring and the turntable have the same path direction and can be stretched together. Figures 3D-3E .

[0061] In one example, the spiral ring 21 of the elastic ring 20 maintains the same spiral extension radius and direction as the disc ring 11. The helical pitch angle of the elastic ring 20 can be different from that of the disc 10. In a preferred example, the helical pitch angle Φ3 of the elastic ring 20 is significantly greater than the helical pitch angle Φ1 of the primary helical structure of the disc 10. The helical pitch angle Φ3 of the elastic ring 21 is 8° to 15°. Even if the elastic ring 20 and the disc 10 overlap when projected, with a larger helical pitch angle Φ3, the multiple turns of the elastic ring 21 of the elastic ring 20 form a certain height or thickness. This allows the outermost turn of the elastic ring 20, with a certain height, to rest against the papillary muscles or inner heart wall during valve opening and closing, while the proximal disc 10 is supported by the elastic ring 20, thereby precisely locating the disc 10 along the length of the chordae tendineae, ultimately improving the efficiency of chordae tendineae repair.

[0062] In one example, a coupling is provided at the proximal end of the rotary disk 10. In the present invention, any coupling that can connect the rotary disk 10 to the conveyor is feasible. Figure 4 As shown, in one example, the connector 30 has a connecting rod 31, and the distal end of the connecting rod 31 is preferably connected to the proximal end of the center 10a of the turntable 10 by an integral molding. There may be a small angle between the connecting rod 31 and the axis of the turntable 10, for example, the angle is 0 to 15 degrees, and more preferably 0 degrees, that is, the connecting rod 31 is vertically arranged at the center of the turntable 10. The end face of the proximal end of the connecting rod 31 continues to extend along the axial surface to form a transverse plate 32 for clamping the port at the distal end of the conveyor. During the process of conveying the tendon repair device, the transverse plate 32 can be inserted and clamped in the distal end port of the conveyor. One side of the transverse plate 32 is connected to the end face of the connecting rod 31, and is more preferably integrally molded on the end face of the connecting rod 31. The horizontal plate 32 is axially snapped into place at the distal end of the coupler. This secure and reliable connection prevents the chord repair device from spinning while being transported by the conveyor. When the turntable 10 rotates, the tendons are securely gathered within the turntable's path 12, preventing slippage and spinning between the distal end of the conveyor and the coupler 30. A pull-wire hole 321 is provided at the proximal end of the horizontal plate 32. The pull-wire in the conveyor can be passed through this hole, keeping the chord repair device connected to the distal end of the conveyor until it is inserted. Once inserted, the pull-wire is released, and the chord repair device is implanted at the appropriate location along the length of the tendon.

[0063] In one example, a pair of center columns 33 extend from the center of each of the two side surfaces of the transverse plate 32. When the tendon repair device is clamped in the distal end of the conveyor in an axial manner on the transverse plate 32, the presence of the centering columns 33 ensures that the entire turntable can be inserted into the distal end of the conveyor in a centered and aligned manner. The side surfaces of the centering columns 33 are integrally formed on the side surfaces of the transverse plate 32. In a further preferred example, a bottom surface of the centering column 33 is integrally formed with the end surface of the connecting rod 31. The centering column 33 can be various cylinders that can be used for center alignment, such as arc cylinders, elliptical cylinders, square cylinders or prisms, etc. For ease of processing, arc cylinders are preferred.

[0064] like Figures 5A-5B As shown, the steps of a preferred embodiment of the chordae tendineae repair device provided by the present invention (taking tricuspid valve repair as an example, the device is also applicable to mitral valve) are as follows:

[0065] Step 1: The guidewire punctures the right femoral vein. The catheter sheath and catheter enter the right femoral vein along the guidewire and exit the catheter sheath to form a pathway.

[0066] Step 2: Insert the delivery device, pre-loaded with the present invention's chordal repair device, along the catheter into the right atrium. Direct the delivery device's distal end (away from the operator) across the tricuspid valve and into the right ventricle. Gradually release the device until it is free, allowing the chordae tendineae to pass through. Rotate the operating handle to gradually draw the chordae tendineae in the right ventricle toward the center of the rotating disk.

[0067] Step 3: After implantation is complete, gradually withdraw the delivery device and release the connector.

[0068] Step 4: After confirming that the device is installed properly, withdraw the conveyor and complete the operation.

[0069] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined by the appended claims.

Claims

1. A chordal tendon repair device that prevents downward migration, comprising: A rotary disk for retracting chordae tendineae, characterized in that the chordae tendineae repair device further comprises an elastic ring for preventing the chordae tendineae repair device from moving downward, and the distal end of the rotary disk is connected to the elastic ring; The rotating disk is also provided with an elastic starting point, and the elastic starting point is connected to the elastic ring toward the far end; The elastic ring has a plurality of spiral rings extending from the elastic point to the distal end; The center of the rotating disk has a disk center, and the rotating disk has a plurality of disk rings extending spirally with a first radius gradually increasing from the disk center in the radial direction, and the gaps between adjacent disk rings form a disk path; The elastic spiral ring is extended out of the elastic ring in a spiral with a first radius gradually increasing and coinciding with the corresponding point of the rotating disk from the elastic point as the starting point, that is, when viewed from the proximal end to the distal end, the extension direction of the elastic ring and the rotating disk overlap; The elastic ring forms an elastic path, and the elastic path is consistent with the extension direction of the disk path; The number of turns of the spring ring is smaller than the number of turns of the disk ring, that is, when viewed from the proximal end to the distal end, the spring ring is completely covered by the disk; The helix angle Φ of the spring spiral ring is 8° to 15°.

2. The chordal tendon repair device for preventing downward migration according to claim 1, characterized in that: The elastic ring is integrally extended from the elastic point toward the distal end.

3. The chordal tendon repair device for preventing downward migration according to claim 2, characterized in that: The helical pitch angle of the elastic ring is greater than the helical pitch angle of the rotating disk.

4. The chord tendon repair device for preventing downward migration according to claim 1, characterized in that: The ring diameter of the spring screw ring is smaller than the ring diameter of the disk ring of the rotating disk.

5. The chordal tendon repair device for preventing downward migration according to claim 1, characterized in that: The springing point coincides with the disk center, or there is a certain distance between the springing point and the disk center.

6. The chord tendon repair device for preventing downward migration according to claim 1, characterized in that: The tendon repair device also has a connector, which has a connecting rod. The distal end of the connecting rod is connected to the proximal end of the rotary disk, and the end face of the proximal end of the connecting rod continues to extend along the axial surface to form a horizontal plate for clamping.

7. The chord tendon repair device for preventing downward migration according to claim 6, characterized in that: The center of the rotating disk has a disk core, and the distal end of the connecting rod is integrally connected with the proximal end of the disk core of the rotating disk.

8. The chord tendon repair device for preventing downward migration according to claim 6, characterized in that: One side of the transverse plate is connected to the end surface of the connecting rod.

9. The chordal tendon repair device for preventing downward migration according to claim 8, characterized in that: One side of the transverse plate is integrally formed on the end surface of the connecting rod.

10. The chord tendon repair device for preventing downward migration according to claim 6, characterized in that: A pair of center columns extend from the centers of the two side surfaces of the transverse plate.

11. The chord tendon repair device for preventing downward migration according to claim 10, characterized in that: The side surface of the centering column is integrally formed on the side surface of the transverse plate.

12. The chord tendon repair device for preventing downward migration according to claim 11, characterized in that: A bottom surface of the centering column and an end surface of the connecting rod are integrally formed.

13. The chord tendon repair device for preventing downward migration according to claim 10, characterized in that: The centering column is an arc column, an elliptical column, a square column or a prism.

14. The chord tendon repair device for preventing downward migration according to claim 6, characterized in that: A wire through hole is provided at the proximal end of the transverse plate.

15. The chord tendon repair device for preventing downward migration according to claim 6, characterized in that: The angle between the connecting rod and the axis of the rotating disk is 0-15°.

16. The chord tendon repair device for preventing downward migration according to claim 6, characterized in that: The rotating disk has a primary spiral structure in the radial direction, and also has a secondary spiral structure in the axial direction.

17. The chord tendon repair device for preventing downward migration according to claim 16, wherein: The rotating disk has a disk center. The rotating disk radially extends spirally with the disk center as a starting point and a gradually increasing first radius as a radius to form the primary spiral structure.

18. The chord tendon repair device for preventing downward migration according to claim 17, wherein: The rotating disk radially extends a plurality of primary disk rings spirally with the disk center as the starting point and a gradually increasing first radius as the radius to form the primary spiral structure, and the gaps between adjacent primary disk rings form a disk path.

19. The chord tendon repair device for preventing downward migration according to claim 18, wherein: The turning disk spirally extends with the spiral line of the primary spiral structure as the axis and the second spiral lead angle as the angular rate to form the secondary spiral structure.

20. The chordal tendon repair device for preventing downward migration according to claim 19, wherein: The rotating disk spirally extends a plurality of secondary disk rings with the spiral line of the primary spiral structure as the axis, the second radius as the radius, and the second spiral rise angle as the angular rate to form the secondary spiral structure.

21. The chord tendon repair device for preventing downward migration according to claim 20, characterized in that: The rotating disk takes the spiral line of the primary spiral structure as the axis, the middle point of the spiral line as the starting point, the second radius as the radius, and the second spiral rise angle as the angular rate to spirally extend a plurality of secondary disk rings to form the secondary spiral structure.

22. The chord tendon repair device for preventing downward migration according to claim 19, wherein: An average value of the first radius is 5 to 50 times an average value of the second radius.

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