Aortic valve stents to prevent paravalvular leaks

Abstract

The invention discloses an aortic valve stent (100) capable of preventing perivalvular leakage. The aortic valve stent (100) capable of preventing perivalvular leakage comprises a stent (110) and an artificial valve (104), wherein the stent (110) is composed of a plurality of grid cells (112); the artificial valve (104) is connected to the grid cells (112); a sealing unit (106) is arranged at the bottom of the stent (110); the sealing unit (106) is made from a metal memory material and laminated; in a natural state, the sealing unit (106) is arched outwards along the axial direction of the stent and of an annular structure along the peripheral direction of the stent (110); one end of the sealing unit (106) is free and is a free end (116); the other end of the sealing unit (106) is fixed with the bottom of the stent (110) by a fixing element, and is a fixed end (126); when the sealing unit (106) is compressed to enter a sheathing canal, the free end (116) of the sealing unit (106) turns towards the bottom end of the stent and around the fixed end (126), thus the sealing unit (106) is not superposed with the stent (110).

Description

Technical field: [0001] The invention belongs to the field of medical devices, and in particular relates to an aortic valve stent for preventing paravalvular leakage. Background technique: [0002] Aortic valve stenosis is a common heart valve disease in the elderly. The incidence rate is about 4% in patients aged 75-85, and increases to about 7% in patients over 85 years old. Among them, the incidence of aortic valve stenosis due to aortic valve calcification reaches 2%-7%, and with the increase of age, its proportion increases, and it has become an important cause of heart failure, arrhythmia, syncope and sudden death in the elderly one. Surgical valve replacement is the first traditional treatment method, but the mortality rate is very high for patients with advanced age, low heart function or multiple complications. Symptoms and recurrence rates are high. [0003] Since 2002, Cribier et al took the lead in reporting the first case of human percutaneous aortic valve re...

AI Technical Summary

Problems solved by technology

When the compliance of the stent is insufficient, the support force of the stent is high, and the valve stent maintains a circular design after release. Although the hemodynamics and opening and closing functions of the valve are guaranteed, there will be paravalvular leakage in the tissue ring recess; when the stent complies When the stability is good, the support force of the stent is low, and the valve stent conforms to the contour of the tissue ring after being released. At this time, the valve becomes irregular passively, and the protruding part of the tissue ring will deform the valve, and the performance of the valve will decline; 2. The sealing in the existing design The unit cannot automatically fill the concavity of the patient's tissue ring and conform to its convexity; third, the partially sealed unit in the existing design will cause difficulty in sheathing, increase the diameter of the sheath tube, and may cause serious vascular complications after use; Water-swellable materials are used to prevent paravalvular leaks where there may be an uncontrollable rate of swelling and a risk of leakage

Images