Biodegradable Metal Vascular Stents

Abstract

The invention relates to a biodegradable vascular scaffold, which comprises: a tubular biodegradable metal structure, optionally a biodegradable metal layer covering at least one part of the surface of the metal structure, and optionally a compound layer covering at least one part of the surface of the metal structure and / or the metal layer, wherein the thickness of the metal layer is 0-20 [mu]m, preferably 5-15 [mu]m, and the thickness of the compound layer is 0-5 [mu]m, preferably 1-4 [mu]m.

Description

technical field [0001] The invention generally relates to a biodegradable metal stent, in particular to a blood vessel stent for a human body, and belongs to the technical field of medical materials. Background technique [0002] Vascular stents are used to treat occlusions in the lumen of blood vessels in animals. Vascular stents are generally tubular in shape and open at both longitudinal ends. The stent is placed into the body in a collapsed shape, usually into the lumen of a vessel, and then expanded to an expanded shape when at the treatment site. Vascular stents have become the treatment of choice for vascular disease, especially where the vascular disease occurs in the coronary arteries and peripheral vessels. [0003] Traditional vascular stents are constructed of alloys such as stainless steel, nickel-titanium, and cobalt-chromium, which are designed to maintain structural integrity throughout the life of the recipient. Biodegradable materials can have many advan...

AI Technical Summary

Problems solved by technology

Corrosion too fast in body fluids and insufficient mechanical strength are the two main disadvantages of pure magnesium

Corrosion is too fast, on the one hand, the hydrogen, magnesium ions, and hydroxide ions generated by degradation will have a toxic effect on the human body; on the other hand, the stent will lose its integrity in a short period of time, failing to achieve the expected effect

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