Interventional valve assembly, interventional valve fixing device and application thereof

Abstract

The invention provides an interventional valve assembly, an interventional valve fixing device and an application thereof. The interventional valve assembly comprises an interventional valve and the interventional valve fixing device for fixing the interventional valve in an annulus and capable of contracting in the radial direction, wherein the interventional valve fixing device is fixed above the annulus, and one end of the interventional valve fixing device abuts against the top end of the annulus. One part of the interventional valve is located in the annulus, and the other part extends out of the annulus to abut against the inner wall of the interventional valve fixing device to fix the interventional valve in the annulus through the interventional valve fixing device. The interventional valve assembly solves the problem in the prior art that the interventional valve conveying difficulty is increased and coronary artery occlusion risk is increased due to the fact that the interventional valve is fixed by increasing the radial force of the interventional valve, and solves the problem that the existing interventional valve is narrow in indication range.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an interventional valve assembly, an interventional valve fixing device and applications thereof. Background technique [0002] Artificial heart valves are divided into mechanical valves, biological valves, and transcatheter implanted artificial heart valves (ie, interventional valves). The interventional valve is mainly composed of a valve frame, leaflets and valve skirt. The implantation process of the interventional valve is as follows: first The interventional valve is compressed into a set of transcatheter delivery system, and then the delivery system is used to deliver the interventional valve to the implantation site through the blood vessel or the apex of the heart and release it, and fix it in the annulus. [0003] At present, the fixation between the interventional valve and the valve annulus mainly acts on the valve annulus through the radial force formed by th...

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Problems solved by technology

[0003] At present, the fixation between the interventional valve and the valve annulus mainly acts on the valve annulus through the radial force formed by the compression of the valve frame, and then the interventional valve is positioned on the implantation site through the friction force between the valve annulus and the valve. , the friction between the valve annulus and the interventional valve is one of the most important factors to determine whether the interventional valve can be placed reliably and stably at the implantation site, and the frictional force depends on two factors, one is the size of the valve holder after implantation Radial force, the other is the friction coefficient between the valve and the valve ring, as shown in the formula: F=μ×Fn, wherein F is the friction force between the valve and the valve ring, μ is the friction coefficient between the valve and the valve ring, Fn is the radial force caused by the compression of the valve frame. If the friction force F is less than the blood pressure between the valves, the valve will not be fixed, and the valve will slide away from the correct fixed position, which will eventually lead to the failure of the operation. Therefore, the friction force F must greater than the blood pressure between the valves, and the change of the friction force needs to be changed from the friction coefficient and the radial force Fn. Among them, the friction coefficient μ is mainly related to the material and structure of the contact part with the valve annulus and the state of the human valve annulus. The limitation of selection makes it difficult to increase the coefficient of friction from the perspective of the valve; while increasing the coefficient of friction from the perspective of the valve annulus is beyond human control, because when the valve leaflets are calcified, the friction coefficient of the valve annulus becomes large, The annulus friction coefficient of non-calcified patients is low, which narrows the range of indications for interventional valves, and the radial force Fn mainly determines the rigidity of the valve frame and the radial compression of the valve, and excessive compression of the valve will affect The performance of the valve, so the rigidity of the valve frame can only be improved to improve the radial force of the valve

[0004] However, due to the increase of the radial force of the valve, the operation of the delivery system will be more difficult, and more importantly, it will also cause fatal dangers such as blockage of the coronary ostium.

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