A heart valve prosthesis

Abstract

The invention relates to a heart valve prosthesis, comprising a stent and an artificial valve, the stent includes an atrium segment and a valve sewing segment, the artificial valve is fixedly connected to the valve sewing segment, and the valve sewing segment The skeleton of the distal end portion of the valve is extended to form a support segment, the support segment and the valve sewing segment are integral structures, one end of the atrial segment is connected with the distal end of the support segment, and the other end of the atrial segment is free , on a cross section perpendicular to the central axis of the artificial valve, the valve sewing segment is located in the support segment, the center of the valve sewing segment does not coincide with the center of the support segment, and the support segment The cross-sectional area of ​​the valve is greater than the cross-sectional area of ​​the valve sewing segment, the cross-sectional area of ​​the atrial segment is greater than the cross-sectional area of ​​the support segment, and the cross-sectional area of ​​the valve sewing segment is smaller than the patient's native valve annulus In the free state, the support segment is at least partially located between the patient's native valve annulus.

Description

Technical field: [0001] The invention belongs to the field of medical equipment, and in particular relates to a heart valve prosthesis. Background technique: [0002] The mitral valve is located at the left atrioventricular orifice and consists of five parts: the valve annulus, valve leaflets, chordae, papillary muscles, and junctional junction. Its anatomically accurate name is mitral apparatus (mitral apparatus) or mitral valve compound Body (mitral complex). The mitral annulus is a band of fibrous tissue attached to the edge of the left atrioventricular orifice, in an irregular "D" shape. The anterior third of the mitral annulus is the continuous part of the anterior valve and the aorta. The angle formed by the corresponding atrium and the mitral valve ring is also different, and the left atrial appendage is attached to the atrium. Mitral valve insufficiency is one of the most common heart diseases, such as mitral valve regurgitation caused by mitral valve prolapse diso...

AI Technical Summary

Problems solved by technology

The main reason is that the mitral valve complex has a special physiological structure, and there is a complex physiological environment below the valve annulus, making it very difficult to accurately position and fix the product

The existing technical problems are summarized as follows: the valve stent is designed as a symmetrical structure, and doctors often choose valve specifications that are equal to or larger than the mitral valve annulus of the patient to cater to the contour of the mitral valve tissue. In addition, direct use of the entire grid structure to contact the mitral annulus will cause compression to the surrounding tissue, further blocking the blood flow of the left ventricular outflow tract; in the current technology, the stent is divided into two parts, the inner and outer parts, and then reconnected , will inevitably cause the stents to overlap. On the one hand, the diameter of the sheath will be increased, and on the other hand, the steps formed at the connection will not be conducive to re-sheathing and re-recovery. Finally, overlapping connections will increase the risk of failure of the connection, such as suture breakage, Stent contact corrosion, etc.; the current mainstream technologies on the market have not fully realized the re-sheathing function of the stent. If it enters the heart and releases some parts, it cannot be withdrawn. Once there is a problem with the stent, it can only be urgently transferred to a surgical thoracotomy. The risk of surgery high

[0012] In summary, although the techniques described above have certain effects on mitral valve replacement, they still have shortcomings. In the field of surgery for the treatment of heart valve disease, a new heart valve prosthetic to solve the above problems

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