A step-by-step clamping valve prosthesis and its delivery system

Abstract

The application relates to a step-by-step clamping valve prosthesis and its delivery system. The valve prosthesis includes a stent body and a clamping body. The stent body has a channel for blood circulation, and the clamping body includes a first clamping body and a clamping body. The second clamping body, one end of the first clamping body is connected to the support body, and the other end is a free end, the second clamping body is connected to the first clamping body, and the clamping body has three forms from compression to complete release, The first form is that both the first clamping body and the second clamping body are compressed and restricted; the second form is that the second clamping body is restricted, and the first clamping body extends along the radial direction of the stent body to reach the valve leaflet and between the heart walls; the third shape is that the second clamping body protrudes from the first clamping body, extends along the circumference of the stent body and abuts against the outer surface of the stent body, and the autogenous valve leaflet and adjacent tissues are clamped at the second Between the second clamping body, the first clamping body and the support body, the contact surface between the valve prosthesis and the autologous tissue can be increased, the position stability in the heart can be improved, and the success rate of the operation can be improved.

Description

Technical field: [0001] The invention belongs to the field of medical devices, and in particular relates to a step-by-step clamping valve prosthesis and a delivery system thereof. Background technique: [0002] The mitral valve body 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 tendons, anterior lobe tendons, and posterior lobe tendons. The single tendon from the papillary muscle bifurcates in a fan shape and inserts into the commissure area of ​​the leaflets. The anterior leaflet tendons insert into the free edge of the anterior leaflet to provide ...

AI Technical Summary

Problems solved by technology

There are three problems with this design. One is that the bracket and the clamping body are cut in one piece. The clamping capacity of the clamping body is greatly affected by the wall thickness of the pipe, and the wall thickness also affects the supporting force of the bracket. When the supporting force of the bracket is too large Sometimes it will cause compression of the tissues near the mitral valve, such as the normal work of the aortic valve. It is difficult for the designer to balance the support force of the stent while pursuing a larger clamping force for the clamping body; the second is that the process of flipping and shaping the clamping body is complicated , even if the shape is successful, the fatigue resistance of the clamping body is still open to question; the third is that the clamping body can only cover and clamp from the area of ​​the valve leaflet that is relatively free of chordae, and its clamping stability is not ideal; The same clamping body can only clamp a single leaflet, and regurgitation between the leaflets cannot be avoided

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