Artificial valve prosthesis with leaflet clamping device

Abstract

The invention relates to artificial valve prosthesis with a valve leaflet clamping device. The manual valve prosthesis comprises a bracket and an artificial valve, wherein the bracket comprises an auxiliary support clamping section and a valve sewing section; the artificial valve is fixedly connected to the valve sewing section; the auxiliary support clamping section is composed of a support bracket, a valve leaflet clamping device and an upper connection fixing section; the leaflet clamping device, the support bracket and the upper connection fixing section are integrally cut; a lower connection fixing section matched with the upper connection fixing section is arranged on the valve sewing section; the bracket is embedded and connected with the lower connection fixing section into a whole through the upper connection fixing section; one part of the valve leaflet clamping device is overlapped with the valve sewing section; the overlapped part is tightly attached to the outer surface of the valve sewing section in a natural state; a bump which protrudes outwards along the radial direction is arranged on a skeleton structure of the valve sewing section in the overlapped region; and a bending section which bends towards the axis direction of the bracket along the radial direction of the bracket is arranged on the valve leaflet clamping device or the support bracket or the upper connection fixing section.

Description

Technical field: [0001] The invention belongs to the field of medical devices, and in particular relates to an artificial valve prosthesis with a leaflet clamping device. Background technique: [0002] Aortic stenosis is mainly caused by sequelae of rheumatic fever, congenital aortic valve structural abnormalities, or senile aortic valve calcification. Patients are asymptomatic during the compensation period, but most patients with severe aortic stenosis have symptoms of fatigue, dyspnea (exertional or paroxysmal), angina pectoris, dizziness or syncope, and even sudden death. [0003] Aortic valve regurgitation means that the aortic valve opens when the ventricle contracts, the blood flow in the left ventricle enters the aorta and shoots to the whole body, and closes when the ventricle relaxes, preventing the blood in the aorta from returning to the left ventricle. In valvular insufficiency, the aortic valve does not close tightly during diastole, causing backflow of blood ...

AI Technical Summary

Problems solved by technology

The disadvantage of this design is that, since the bracket is cut in one piece, the cutting space of the positioning arch and the holding arch must not overlap each other, and there are at least three problems in the bracket after being shaped like this: one is the shape after shaping. The positioning arches and the retaining arches do not overlap with each other, and when the autogenous valve leaflet is clamped between the positioning arches and the retaining arches, only the line contact of several rods, the autologous Under the action of blood flow, the valve leaflets still vibrate to a large extent in the gap between the rods, which affects the normal movement of the artificial valve prosthesis and reduces the effective opening area; The parts are clamped by line contact, and the insufficient clamping force will easily cause the displacement of the artificial valve prosthesis; the third is that the design sutures the annulus of the artificial valve on the retaining arch, although the positioning arch is cut when the stent is cut. The bottom end of the prosthesis is flat with the annulus of the artificial valve, but the end of the positioning arch is likely to be located above the annulus of the artificial valve after being stretched and shaped. If the positioning arch is used for positioning, the artificial The valve is artificially placed in the lower position of the native valve annulus, becoming "intra-annular" or even "sub-annular", which further reduces the effective opening area

[0010] To sum up, the existing design of aortic valve stents cannot completely solve the problem of positioning and anchoring. Once inaccurate positioning causes coronary artery blockage or postoperative stent fall-off, it will directly threaten the life safety of patients.

However, the existing technologies that use native valves for clamping to improve the anchoring effect also have their own problems.

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