Graft for repairing or replacing native valve of heart

Abstract

The invention relates to the technical field of medical instruments, and provides a graft for repairing or replacing a native valve of the heart. The graft can comprise a first covered stent and a second covered stent, wherein the first covered stent has a first internal passage in an expanded state; an artificial leaflet for replacing a native leaflet is fixedly connected to the interior of the first internal passage; the second covered stent has a second internal passage in an expanded state; the first covered stent is located in the second internal passage and fixedly connected with the second covered stent; the second covered stent is suitable for being anchored to a valve ring and a subvalvular structure; and in the expanded state, the atrial side of the second covered stent has a radially extending flange that is adapted to be located on the atrial side of the valve ring, and the atrial-side end aperture of the second covered stent is greater than the ventricular-side end aperture of the second covered stent. The graft is of a double-layer stent structure, so that the anchoring force of the graft can be increased, the stability is improved, and perivalvular leakage and left ventricular outflow tract obstruction can be reduced.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a graft suitable for repairing or replacing a heart's own valve. Background technique [0002] Heart valve refers to the valve between atrium and ventricle or between ventricle and artery. The role of the valves in the heart's never-ending pumping of blood is as mundane as it is crucial: They act as gatekeepers, preventing backflow of blood into the atria (atrioventricular valves) or ventricles (semilunar valves) that have just left. Heart valve damage can be caused by many reasons, such as congenital malformation, aging and myocardial infarction, etc., and the damage left by rheumatic fever is the most common reason, among which the mitral valve located between the left ventricle and left atrium is the most vulnerable . [0003] Mitral valve disease is the most common heart valve disease. With the obvious decline of rheumatic valve disease, the incidence of mitral valv...

AI Technical Summary

Problems solved by technology

[0004] Mitral valve repair or replacement is the gold standard of care for MR, but some studies have shown that as many as half of patients with severe MR do not opt ​​for surgery, largely because of the risks associated with surgery

Therefore, reducing the incidence of LVOT obstruction after TMVR is also a major challenge for TMVR

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