expandable skirt aortic mechanical valve

Abstract

The invention relates to mechanical valve prosthesis of expansion valve skirt aorta, which can be quickly implanted by a cardiac surgeon under direct vision. The mechanical valve prosthesis of the expansion valve skirt aorta comprises a valve frame; one side of the outer circle of the valve frame forms an annular valve groove; an annular spring valve skirt is fixed within the annular valve groove; an open chamber formed inside the spring valve skirt is filled with polyester fiber fillers; shaping sutures are bundled up at the waist part of the outer side of the spring valve skirt. The shaping sutures are bundled up at the waist part of the outer side of the spring valve skirt to reduce the ring size of the spring valve skirt, and after the shaping sutures are released, the spring recovers and the valve groups are expanded. Three noninvasive sutures with needles are preset and fixed on the spring valve skirt. The mechanical valve prosthesis disclosed by the invention can fulfill the aim of replacing the mechanical valve prosthesis of the aorta by only three-needle suture, realizes clinical effects of greatly shortening extracorporeal circulation and cardiac arrest time in operation, implanting large-size mechanical valve prosthesis and remarkably reducing perivalvular leakage complication, and effectively improves the curative effect on replacement of a mechanical valve of the aorta.

Description

technical field [0001] The invention belongs to the technical field of medical devices and relates to a novel aortic mechanical valve with an expandable valve skirt. Background technique [0002] A heart valve is a device similar to a "one-way valve" that keeps blood in the heart in a one-way flow of right atrium-right ventricle-pulmonary circulation-left atrium-left ventricle-systemic circulation. Heart valves play a vital role in maintaining normal heart function and hemodynamic stability in the human body. Heart valvular disease is one of the most common heart diseases, which is extremely harmful to human health and is one of the most important causes of heart failure, especially in China: 1. The incidence of rheumatic heart valvular disease in my country is much higher than that in Europe and the United States 2. my country has gradually entered into an aging society, with a large population base, and the number of patients with degenerative heart valve disease is increa...

AI Technical Summary

Problems solved by technology

However, the current TAVI technology and the suture-free aortic valve are both developed on the basis of biological valves. This is because the biological valve itself is soft and can be placed in a special sheath or implanted device, but the mechanical valve is made of pyrolytic carbon. Creates a rigid structure that cannot be implanted transcatheterly or suture-free with current technology

However, these biological valve-based technologies not only face the serious problem of valve failure, but also have many unresolved defects in clinical application: the clinical indications of TAVI technology are strict, it is difficult to accurately locate the valve under non-direct vision, and the diseased valve Unresectable results in high incidence of paravalvular leakage, high incidence of malignant arrhythmia during operation, and large postoperative transvalvular pressure difference, etc.

[0005] To sum up, at present, the aortic valves that can be implanted through the catheter or directly implanted without sutures (less sutures) are bioprosthetic valves, which are not only easy to perish, but the applicable patient population is narrow, with many postoperative complications and long-term effects. Not good, and the technical process is complicated and expensive, so it is not suitable for most patients in our country

More than 90% of patients in my country choose mechanical valves, but the existing mechanical aortic valves also have the following shortcomings: 1. The process of valve suture, lower valve, and knotting during the operation is time-consuming, and it is impossible to achieve suture-free or less-suture implantation under direct vision. Therefore, the time between CPB and cardiac arrest is long, which is not conducive to the protection of systemic organs, and the risk of surgery is relatively high; 2. The mechanical valve skirt (sewing ring) is not expandable, and it needs to be implanted smaller than the measured diameter of the aortic valve ring by 1 No. or No. 2 artificial valves limit the effective opening area of ​​the implanted valve, increase the transvalvular pressure difference and cardiac load, and are not conducive to the recovery of cardiac function; 3. For aortic valve ring damage or too little residual and connective tissue In diseased patients, it is difficult for the mechanical valve skirt to be firmly sutured and fixed with the original valve ring tissue, which is not only difficult to operate, but also prone to paravalvular leakage after surgery

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