Implanted completely bioresorbable blood vessel polymer support

Abstract

The invention relates to an implanted completely bioresorbable blood vessel polymer support which comprises five or more annular wave-shaped supporting rods and connecting rods connected between the supporting rods at intervals. The supporting rods of the support are formed by alternately connecting quasi-arc-shaped waves and quasi-m-shaped waves, wherein the quasi-arc-shaped waves and the quasi-m-shaped waves are formed by connecting two sets of forward s and inverted s respectively, and every two adjacent supporting rods are connected by connecting the tops of the quasi-arc-shaped waves and the bottoms of the quasi-m-shaped waves through the corresponding connecting rod. The net pattern form of the polymer support is carved on a thin wall pipe through lasers. According to the scheme, the contradiction among the radial supporting force, the wall thickness and flexibility of the polymer support is resolved, the radial supporting force, the wall thickness and flexibility are considered at the same time, good passage capacity is achieved, enough mechanical supporting can be given to a lesion segment within the specific time of injury healing, the support is gradually absorbed by the body after injury healing, endothelialization is good, and the stenosis rate of the support and the risk of the support in later stent thrombosis are reduced effectively.

Description

technical field [0001] The invention belongs to the field of medical devices, in particular to an implantable fully bioabsorbable blood vessel polymer stent. Background technique [0002] Since the first metal stent Palmaz-Schatz was implanted into the human body in 1985, stent interventional therapy has successfully solved the problem of high restenosis rate in the era of simple balloon dilatation, and has become the main method of clinical treatment. After the metal stent is implanted in the human body, it is found that the restenosis rate in the stent is still as high as about 20% due to inflammatory reactions, neointimal hyperplasia, negative vascular remodeling, and delayed endothelialization of the stent. [0003] In order to solve this problem, the first generation of polymer-coated drug-eluting stents came into being. The emergence of drug-eluting stents will reduce the restenosis after interventional treatment from 30-40% in the era of simple PTCA to 15-25% in the ...

AI Technical Summary

Problems solved by technology

However, this solution also has relatively large deficiencies in setting smaller crimping diameters, and especially in the support and stability of its sections when used in polymer stents

[0012] In addition, the tube wall thickness of the existing degradable stent is affected by the material and processing methods, which are thicker than the metal stent, which is 2 times or more than the metal stent, which increases the difficulty of endothelial cells climbing up the stent rod and wrapping it completely , making it difficult to re-endothelialize the surface of the stent, affecting the risk of stent thrombosis

[0013] At present, all kinds of fully bioabsorbable stents on the market cannot achieve the perfect unity of various technical indicators, especially the radial support force, wall thickness and flexibility of the stent

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