Substep clamping-type valve prosthesis and conveying system thereof

Abstract

The invention relates to a substep clamping-type valve prosthesis and a conveying system thereof. The valve prosthesis comprises a support body and a clamping body, the support body is provided with achannel for blood to flow in, and the clamping body comprises a first clamping body and a second clamping body; the support body is connected to one end of the first clamping body, the other end of the first clamping body is a free end, and the second clamping body is connected with the first clamping body; the clamping body has three forms from compression to complete release in sequence, and inthe first form, the first clamping body and the second clamping body are compressed and limited; in the second form, the second clamping body is limited, and the first clamping body extends in the radical direction of the support body to reach between the valve and the heart wall; in the third form, the second clamping body extends out of the first clamping body, extends in the circumference direction of the support body and abuts against the outer surface of the support body. The autologous valve and adjacent tissue are clamped among the second clamping body, the first clamping body and thesupport body, the contact area of the valve prosthesis and the autologous tissue can be increased, the position stability in the heart is improved, and the success rate of the surgery is increased.

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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