A self-expanding transcatheter valve surgical extractor

Abstract

The present invention discloses a self-expanding transcatheter valve surgical extractor, which relates to the technical field of medical devices. The self-expanding transcatheter valve surgical extractor of the present application comprises a disc-shaped base, a sliding disc, a screw and a capture arm. The disc-shaped base comprises an inner rotating disc and an outer rotating disc which are arranged concentrically, and the inner rotating disc and the outer rotating disc can generate relative rotation; one end of the screw is fixed on the inner rotating disc, and the screw is connected to the central threaded hole of the sliding disc; one end of the capture arm is hinged to the outer rotating disc, and the capture arm passes through the through hole of the sliding disc, and the other end of the capture arm is provided with a hook ring, which is used to hook the self-expanding stent of the self-expanding transcatheter valve. When in use, the self-expanding stent of the self-expanding transcatheter valve is first hooked with the hook ring of the capture arm. Then the screw is rotated, and the screw drives the sliding disc to move downward, and the end of the capture arm is folded, thereby driving the self-expanding stent of the transcatheter valve to fold, so as to avoid the metal end of the self-expanding stent from causing damage to the myocardial tissue during the removal process.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular, to a self-expanding transcatheter valve surgical extractor. Background Art

[0002] Cardiac valve diseases affect approximately 300,000 people worldwide each year. These diseases translate into abnormal leaflet tissue, for example, overgrown tissue, tissue degeneration / rupture, or tissue sclerosis / calcification, and some may also translate into abnormal tissue position during the cardiac cycle of the heart, for example, annular dilation or ventricular remodeling. Such abnormal leaflet tissue and abnormal tissue position may lead to the degradation of valve function, including leakage / blood reflux (valvular insufficiency) or resistance to forward blood flow (valvular stenosis).

[0003] Valve replacement surgery is a minimally invasive surgery in which a defective heart valve of a patient is repaired. Therefore, abnormal leaflet tissue or abnormal tissue position can be repaired to restore the operability of the heart valve. In valve replacement surgery, a transcatheter valve is delivered to the patient's native heart valve without removing the native heart valve of the patient, and the function of the native heart valve is replaced by the transcatheter valve.

[0004] Currently, the commonly used transcatheter valve is a self-expanding transcatheter valve prosthesis. The valve prosthesis includes valve leaflets and a self-expanding stent that supports the valve leaflets. During the replacement surgery, the valve prosthesis can be first positioned at the desired position in a compressed or contracted delivery state and then the self-expanding stent is released, so that the valve prosthesis expands back to the deployed state and is fixed at the desired position.

[0005] Since the prosthetic valve components inside the stent structure have a certain service life, when the valve prosthesis has been placed in the body for a period of time, it will need to be replaced. However, after the self-expanding stent is released, it cannot be compressed back, resulting in the metal ends of the self-expanding stent being prone to damage the myocardial tissue during the extraction process of the valve prosthesis. Summary of the Invention

[0006] Embodiments of the present application provide a self-expanding transcatheter valve surgical extractor, which solves the problem in the prior art that the metal ends of the self-expanding stent of the self-expanding transcatheter valve are prone to damage the myocardial tissue, and improves the safety of extracting the self-expanding transcatheter valve.

[0007] Embodiments of the present application provide a self-expanding transcatheter valve surgical extractor, including:

[0008] A disc-shaped base, the disc-shaped base includes an inner turntable and an outer turntable that are concentrically arranged, and relative rotation can occur between the inner turntable and the outer turntable;

[0009] A sliding disc, the sliding disc has a central threaded hole and a through hole;

[0010] A screw, one end of the screw is fixed on the inner turntable, and the screw is connected to the central threaded hole of the sliding disk; and

[0011] A capture arm, the capture arm and the screw are on the same side of the disk-shaped base. One end of the capture arm is hinged to the outer turntable. The capture arm passes through the through hole of the sliding disk. A hook is provided at the other end of the capture arm, and the hook is used to capture the first end of the self-expanding stent of the self-expanding transcatheter valve.

[0012] Further, the self-expanding transcatheter valve surgical extractor further includes a telescopic sleeve. The telescopic sleeve is a metal mesh structure, and one end of the telescopic sleeve is fixed on the side of the sliding disk close to the hook of the capture arm.

[0013] Further, the length of the capture arm is 7.5 - 8.5 cm.

[0014] Further, the stroke of the sliding disk is 6 - 8 cm.

[0015] Further, the disk-shaped base further includes a fixed disk. The fixed disk is fixedly connected to the outer turntable. The fixed disk has a central through hole. The screw passes through the central through hole, and one end of the capture arm is hinged on the fixed disk.

[0016] Further, the self-expanding transcatheter valve surgical extractor has a plurality of the capture arms. The number of the through holes on the sliding disk is equal to the number of the capture arms, and the centers of the through holes are all located on the same concentric circle with the center of the sliding disk.

[0017] Further, the self-expanding transcatheter valve surgical extractor has 2 - 4 of the capture arms.

[0018] Further, the distance from the center of the through hole on the sliding disk to the center of the sliding disk is 2.5 - 4 cm.

[0019] Further, a rotary handle is provided on the side of the inner turntable opposite to the screw.

[0020] Further, the rotary handle is fixed on the inner turntable through a rigid connecting rod.

[0021] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0022] The self-expanding transcatheter valve surgical extractor includes a disc-shaped base, a sliding disc, a screw and a capture arm. The disc-shaped base includes an inner rotating disc and an outer rotating disc that are concentrically arranged, and the inner rotating disc and the outer rotating disc can generate relative rotation; the sliding disc has a central threaded hole and a through hole; one end of the screw is fixed on the inner rotating disc, and the screw is connected to the central threaded hole of the sliding disc; the capture arm and the screw are located on the same side of the disc-shaped base, one end of the capture arm is hinged to the outer rotating disc, the capture arm passes through the through hole of the sliding disc, and the other end of the capture arm is provided with a hook ring, and the hook ring is used to hook the self-expanding stent of the self-expanding transcatheter valve. When in use, first use the hook ring of the capture arm to hook the self-expanding stent of the self-expanding transcatheter valve. The handle is then rotated to drive the inner turntable and the screw fixed on the inner turntable to rotate, and the screw drives the sliding disk to move downward, so that the end of the capture arm is retracted, thereby driving the self-expanding stent of the transcatheter valve to retract, avoiding the metal end of the self-expanding stent to damage the myocardial tissue during the removal process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the current self-expanding transcatheter valve;

[0024] Figure 2 A top view of a schematic diagram of the structure of a current self-expanding transcatheter valve;

[0025] Figure 3 This is a schematic structural diagram of a self-expanding transcatheter valve surgical extractor in an embodiment of the present invention;

[0026] Figure 4 A parts diagram of a disc-shaped base of a self-expanding transcatheter valve surgical extractor according to an embodiment of the present invention;

[0027] Figure 5 A parts diagram of a sliding disk of a self-expanding transcatheter valve surgical extractor according to an embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of a sleeve in a retracted state in an embodiment of the present invention;

[0029] Figure 7 It is a schematic diagram of the expanded state of the sleeve in an embodiment of the present invention.

[0030] Reference numerals:

[0031] Disk-shaped base 210, inner turntable 211, outer turntable 212, rotary handle 213, rigid connecting rod 214, fixed disk 215, sliding disk 220, central threaded hole 221, through hole 222, screw 230, capture arm 240, hook 241, telescopic sleeve 250, valve prosthesis 100, expandable stent 102, valve leaflet 104, raised portion 108. Detailed implementation mode

[0032] To make the objectives, technical solutions and advantages of the present invention clearer, the following will further describe in detail the embodiments of the present invention with reference to the accompanying drawings.

[0033] Figure 1 It is a schematic structural diagram of a currently self-expanding transcatheter valve. Figure 2 It is a top view of the schematic structural diagram of a currently self-expanding transcatheter valve. As Figure 1 and Figure 2 shown, the valve prosthesis 100 includes valve leaflets 104 and a self-expanding stent 102 that supports the valve leaflets 104. The valve leaflets 104 can block blood flow in one direction to regulate the blood flow through the valve prosthesis 100 via the valve leaflets 104, and the valve leaflets 104 can form a mitral or tricuspid replacement valve. Figure 2 An exemplary tricuspid replacement valve with three valve leaflets 104 is shown. The self-expanding stent 102 is self-expanding and can return from a compressed or contracted delivery state to an expanded deployed state. The expanded self-expanding stent 102 includes an enlarged first end 116, a waist region 117, and a second end 118, so that the self-expanding stent 102 can be better fixed in the desired position when it is deployed. The self-expanding stent 102 may also include a raised portion 108 extending from its first end 116 for positioning in the delivery catheter.

[0034] Figure 3 It is a schematic structural diagram of a self-expanding transcatheter valve surgical extractor in an embodiment of the present invention. As shown in the figure, the self-expanding transcatheter valve surgical extractor includes a disk-shaped base 210, a sliding disk 220, a screw 230, and a capture arm 240.

[0035] Figure 4 It is a part drawing of the disk-shaped base 210 of a self-expanding transcatheter valve surgical extractor in an embodiment of the present invention. As Figure 4 shown, the disk-shaped base 210 includes a concentrically arranged inner turntable 211 and an outer turntable 212, and relative rotation can occur between the inner turntable 211 and the outer turntable 212. Specifically, the inner turntable 211 can be a disk-shaped part, and the outer turntable 212 can be an annular part. The inner turntable 211 is embedded in the annular middle empty part of the outer turntable 212, so that relative rotation can occur between the inner turntable 211 and the outer turntable 212.

[0036] Figure 5 FIG. 2 is a part diagram of a sliding disk 220 of a self-expanding transcatheter valve surgical extractor according to an embodiment of the present invention, as shown in FIG. Figure 5 As shown, the sliding plate 220 has a central threaded hole 221 and a through hole 222 .

[0037] See also Figure 3 , Figure 4 and Figure 5 One end of the screw rod 230 is fixed on the inner rotating disk 211, and the screw rod 230 is connected to the central threaded hole 221 of the sliding disk 220. The capture arm 240 and the screw rod 230 are located on the same side of the disk-shaped base 210, and one end of the capture arm 240 is hinged to the outer rotating disk 212, and the capture arm 240 passes through the through hole 222 of the sliding disk 220. The other end of the capture arm 240 is provided with a hook ring 241, and the hook ring 241 is used to capture the first end 116 of the self-expanding stent 102 of the self-expanding transcatheter valve.

[0038] When in use, the self-expanding stent is first hooked with the hook ring 241 of the capture arm 240. Then, by rotating the inner turntable 211, the inner turntable 211 and the screw 230 fixed on the inner turntable 211 are driven to rotate, and the screw 230 drives the sliding plate 220 to move downward, so that the end of the capture arm 240 is retracted, thereby driving the first end 116 of the self-expanding stent 102 of the transcatheter valve to retract, so that the diameter of the first end 116 is reduced, so as to prevent the metal end of the self-expanding stent 102 from causing damage to the myocardial tissue during the removal process.

[0039] Further, a rotating handle 213 is provided on the side of the inner rotating disk 211 opposite to the screw rod 230. Specifically, the rotating handle 213 can be fixed on the inner rotating disk 211 through a hard connecting rod 214 to facilitate the rotation of the inner rotating disk 211.

[0040] Furthermore, the length of the capture arm 240 is 7.5-8.5 cm, preferably 8 cm. The travel of the sliding plate 220 is 6-8 cm, preferably 7 cm.

[0041] In some embodiments, the disc-shaped base 210 further includes a fixed disc 215, the fixed disc 215 is fixedly connected to the outer rotating disc 212, the fixed disc 215 has a central through hole (not shown in the figure), the screw rod 230 passes through the central through hole, and one end of the capture arm 240 is hinged on the fixed disc 215. Specifically, one end of the capture arm 240 can be hinged on the fixed disc 215 at a position close to the center, so as to expand the deployment angle of the capture arm 240, reduce the stroke of the screw rod 230, and facilitate the miniaturization of the self-expanding transcatheter valve surgical extractor.

[0042] Optionally, the radius of the fixed disk 215 is the same as the radius of the outer rotating disk 212, and the outer edges of the fixed disk 215 and the outer rotating disk 212 are fixed by connecting rods.

[0043] Furthermore, the self-expanding transcatheter valve surgical extractor has a plurality of the capture arms 240, and the number of the through holes 222 on the sliding disk 220 is equal to the number of the capture arms 240. Refer to Figure 5 , the centers of the through holes 222 are all located on the same concentric circle centered on the center of the sliding disk 220, so that the strokes and opening and closing angles of the plurality of capture arms 240 are the same, facilitating the opening and closing operations of the capture arms 240.

[0044] Furthermore, the distance L from the center of the through hole 222 on the sliding disk 220 to the center of the sliding disk 220 is 2.5 - 4 cm, preferably, L is 3 cm.

[0045] Furthermore, the self-expanding transcatheter valve surgical extractor has 2 - 4 of the capture arms 240. Exemplarily, Figure 3 only shows the case of 2 capture arms 240, but it is not a limitation of this application. In other embodiments, the self-expanding transcatheter valve surgical extractor may also be provided with 3 or 4 capture arms 240.

[0046] In some embodiments, the self-expanding transcatheter valve surgical extractor further includes a telescopic sleeve 250. The telescopic sleeve is a metal mesh structure, and one end of the telescopic sleeve is fixed to the side of the sliding disk 220 close to the hook 241 of the capture arm 240. Exemplarily, the telescopic sleeve may be composed of a metal wire mesh. Specifically, the telescopic sleeve may adopt a multi-section manner, and when it contracts, it is nested together to reduce the volume, and when it expands, it is pulled out from the end.

[0047] Refer to Figure 6 and Figure 7 , after the end of the capture arm 240 hooks the self-expanding stent of the self-expanding transcatheter valve, the telescopic sleeve is deployed, and the remaining self-expanding transcatheter valve can be further contracted into the telescopic sleeve, physically isolating the self-expanding stent and the myocardial tissue, and further improving the safety when the self-expanding transcatheter valve is removed.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A self-expanding transcatheter valve surgical extractor, characterized in that, the self-expanding transcatheter valve surgical extractor comprises: a disc-shaped base (210), the disc-shaped base (210) includes a concentrically arranged inner turntable (211) and an outer turntable (212), and relative rotation can occur between the inner turntable (211) and the outer turntable (212); a sliding disc (220), the sliding disc has a central threaded hole (221) and a through hole (222); a screw rod (230), one end of the screw rod (230) is fixed on the inner turntable (211), and the screw rod (230) is connected to the central threaded hole (221) of the sliding disc (220); and a capture arm (240), the capture arm (240) and the screw rod (230) are on the same side of the disc-shaped base (210), one end of the capture arm (240) is hinged to the outer turntable (212), the capture arm (240) passes through the through hole of the sliding disc (220), and a hook ring (241) is provided at the other end of the capture arm (240), and the hook ring (241) is used to capture the first end (116) of the self-expanding stent (102) of the self-expanding transcatheter valve.

2. The self-expanding transcatheter valve surgical extractor according to claim 1, characterized in that, the self-expanding transcatheter valve surgical extractor further comprises a telescopic sleeve (250), the telescopic sleeve (250) is a metal mesh structure, and one end of the telescopic sleeve (250) is fixed to the side of the sliding disc (220) close to the hook ring (241) of the capture arm (240).

3. The self-expanding transcatheter valve surgical extractor according to claim 1, characterized in that, the disc-shaped base further comprises a fixed disc (215), the fixed disc (215) is fixedly connected to the outer turntable (212), the fixed disc (215) has a central through hole, the screw rod (230) passes through the central through hole, and one end of the capture arm (240) is hinged to the fixed disc.

4. The self-expanding transcatheter valve surgical extractor according to claim 1, characterized in that, the length of the capture arm (240) is 7.5 - 8.5 cm.

5. The self-expanding transcatheter valve surgical extractor according to claim 1, characterized in that, the stroke of the sliding disc (220) is 6 - 8 cm.

6. The self-expanding transcatheter valve surgical extractor according to any one of claims 1 - 5, characterized in that, the self-expanding transcatheter valve surgical extractor has a plurality of the capture arms (240), the number of the through holes (222) on the sliding disc is equal to the number of the capture arms (240), and the centers of the through holes (222) are all located on the same concentric circle with the center of the sliding disc (220).

7. The self-expanding transcatheter valve surgical extractor according to claim 6, characterized in that, the self-expanding transcatheter valve surgical extractor has 2 - 4 of the capture arms (240).

8. The self-expanding transcatheter valve surgical extractor according to claim 6, It is characterized in that the distance from the center of the through hole (222) on the sliding disk (220) to the center of the sliding disk (220) is 2.5 to 4 cm.

9. The self-expanding transcatheter valve surgical extractor according to any one of claims 1 to 5, It is characterized in that a rotating handle (213) is provided on one side of the inner turntable (211) opposite to the screw (230).

10. The self-expanding transcatheter valve surgical extractor according to claim 9, It is characterized in that the rotating handle (213) is fixed on the inner turntable through a rigid connecting rod (214).

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