Bracket for repairing mitral valve

Abstract

The stent comprises a skeleton and a membrane assembly, the skeleton comprises an atrium limiting part and a membrane fixing part, the membrane fixing part comprises a V-shaped supporting section, a first sleeve and a second sleeve, the first sleeve and the second sleeve are connected to the left end and the right end of the V-shaped supporting section in a bilateral symmetry mode, and the membrane assembly is fixed in the membrane fixing part. The atrium limiting piece comprises a first limiting curve section located above the front side and a second limiting curve section located above the rear side, and the first limiting curve section and the second limiting curve section are crossed twice on the left side and the right side respectively to form an annular part and then are connected with the upper ends of the first sleeve and the second sleeve; the framework further comprises an upturning abutting piece located on the front side and / or the rear side of the membrane fixing piece, the lower end of the upturning abutting piece is connected with the tip end of the lower portion of the V-shaped supporting section, and the upper end of the upturning abutting piece abuts against the lower surface of the mitral valve annulus. The stent has the advantages that the defects that an existing stent is unstable in anchoring, cannot be recovered to the initial state, is limited in indications, increases the risk of thrombosis in use and the like can be effectively overcome.

Description

technical field [0001] The invention belongs to the field of medical devices and relates to a repairing device for mitral valve insufficiency, in particular to a mitral valve valve repairing stent. Background technique [0002] The surgical treatment of mitral regurgitation is divided into valve repair and valve replacement. Surgical valve repair or replacement is considered the standard treatment for the disease. However, surgical procedures have disadvantages such as large trauma, high risk, and slow recovery. With the development of interventional therapy technology, transcatheter mitral valve replacement or repair has been rapidly developed and applied clinically. The interventional catheter is sent through the femoral vein, jugular vein or heart apex, and the artificial heart valve or repair instrument is delivered to the valve. The open area can preserve the original structure of the mitral valve to the greatest extent, so as to restore the valve function. [0003] ...

AI Technical Summary

Problems solved by technology

The MitraClip technology in edge-to-edge repair has been applied clinically. It has the characteristics of high surgical success rate and relatively good safety, but it also has disadvantages: complex operation, easy to damage the valve, sacrificing the effective opening area of ​​the valve, and limited long-term effectiveness. lacking

On the basis of the above-mentioned support, follow-up in-depth research has found that it also has the following problems: (1) the bottom of the support extends outwards to have a limit curve section that plays a role in positioning the support (such as the third limit curve section 12 and 12 in CN113476181A The fourth limiting curve segment 13) will have more contact with the original leaflet of the mitral valve during use. On the one hand, it will cause the stent to jump up and down greatly, the device is unstable, and the position of the intima component of the stent is not fixed. , the position of the original valve leaflet clamping membrane component is lower and affects the effect of valve repair. On the other hand, frequent and continuous contact will also cause damage to the original valve leaflet; (2) When the stent is squeezed, especially the force in the left and right directions, The anterior and posterior membranes of the intima component are prone to deformation and unevenness, resulting in insufficient fit between the membrane component and the original valve leaflets. In addition, there is a narrow channel for blood flow between the anterior and posterior membranes. The study found that this The existence of channels increases the risk of thrombus formation, and because the front and rear membranes are separable, in order to ensure the repair effect, the positioning requirements for stent implantation are relatively high

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