Bare stent compressible and stretchable in axial direction

Abstract

The invention relates to a bare stent compressible and stretchable in the axial direction. The bare stent is used in the aorta and provided with at least two layers of woven meshes, and is characterized in that the bare stent is provided with a non-sparse-mesh area and a sparse-mesh area; the non-sparse-mesh area is formed by overlapping and interweaving at least two kinds of first wires and second wires with different diameters, the first wires have the diameter of 20-150 microns, and the second wires have the diameter of 150-600 microns; the sparse-mesh area is only composed of the second wires and is arranged at the position, with a branch artery, in the corresponding treatment position after the bare stent is released; and in the natural release state, except the sparse-mesh area, the bare stent has the metal coverage rate of at least 60%. The present invention relates to the bare stent for the treatment of aortic aneurysms and / or aortic dissection lesions, in particular type A aortic dissection, which is axially stretchable and radially compressible in a released state to obtain a delivery configuration of suitable dimensions for performing a procedure using a delivery catheter conventionally delivered through the femoral artery.

Description

technical field [0001] The invention relates to a bare stent, in particular to a bare stent used in the treatment of aortic lesions, such as aortic aneurysm or aortic dissection. Background technique [0002] The arterial wall is composed of intima, media, and adventitia tightly fitting together. When the inner wall of the arterial vessel is partially damaged, under the strong impact of the arterial blood flow, the medial membrane of the arterial vessel wall is gradually peeled off, so that blood enters between the medial membrane and the adventitia of the vessel wall, forming two lumens, true and false. The most common is aortic dissection. An aortic dissection weakens the arterial wall and is at risk of rupture, which can kill the patient within minutes. [0003] Aortic dissection is divided into type A and type B according to the intimal tear site and extent (i.e., Stanford classification). Type A refers to lesions involving the ascending aorta. The site of dissection ...

AI Technical Summary

Problems solved by technology

Such a large diameter dense mesh stent cannot be radially compressed to a small diameter, often requiring a thicker delivery system

This makes it difficult to place the delivery system through the femoral artery with a relatively small diameter, especially for Asians with relatively thin blood vessels, and even makes it impossible to implement

In order to reduce the diameter of the stent in its compressed state, thinner wires can be used to braid the stent, but this results in insufficient radial support of the stent for therapeutic purposes

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