A kind of stent valve prosthesis and delivery system thereof

Abstract

The application relates to a stent valve prosthesis and its delivery system, including a stent, leaflets and clamping parts, the stent includes a support section and a valve sewing section, the proximal end of the support section is connected to the distal end of the valve sewing section, and the leaflet is Connected to the valve sewing segment, the support segment is released and placed on the patient's valve annulus and against the atrial tissue, the clamping part includes one or more side wings, and one end of the clamping part is fixedly connected to the outside of the valve sewing segment On the surface, the clip has three states from compression to complete release. The first state is that the side wings are compressed in the control device; the second state is that the side wings extend along the radial direction of the valve sewing segment and pass through the valve of the adjacent tissue. The junction of the leaflets reaches between the leaflets and the heart wall; the third form is that the wings extend along the circumference of the valve sewing segment and abut against the outer surface of the valve sewing segment. After the release, the patient's tissue leaflets and adjacent chordae are clamped It is held between the side wings and the valve sewing section, which is conducive to improving the anchoring firmness of the valve stent and improving the success rate of the operation.

Description

Technical field: [0001] The invention belongs to the field of medical equipment, and in particular relates to a stent valve prosthesis and a delivery system thereof. Background technique: [0002] The mitral valve structure consists of the mitral annulus, anterior valve, posterior valve, chordae, papillary muscles, left atrium and left ventricle. The anterior leaflet and the posterior leaflet are jointly divided, which are located in the anterolateral part and the posterior middle part, respectively. The chordae from the bilateral papillary muscles are inserted into the valve leaflets. According to the different insertion sites, the chordae are divided into three types as a whole: commissural tendon, anterior lobe tendon, and posterior lobe tendon. The commissure tendon, as its name implies, inserts into the commissure area of ​​the valve. Usually a single tendon originating from the papillary muscle fanned out and inserted into the commissure. The tendon of the anterior ...

AI Technical Summary

Problems solved by technology

There are three problems with this design. One is that the bracket and the clamp are cut in one piece. The clamping capacity of the clamp is greatly affected by the wall thickness of the pipe, and the wall thickness also affects the bracket. When the support force of the bracket is too large, it will cause Compressing the tissues near the mitral valve, such as the normal work of the aortic valve, it is difficult for the designer to balance the supporting force of the stent while pursuing a larger clamping force for the clamping part; success, the fatigue resistance of the clip is also open to question; third, the clip can only cover and clamp from the area of ​​the valve leaflet that is relatively free of chordal tendons, and its clamping stability is not ideal; fourth, the same clip The holder can only hold a single leaflet, and regurgitation between the leaflets cannot be avoided

To sum up, although the technologies described above have certain effects in valve repair, the existing products have more or less defects in the design of the anchoring mechanism

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