Adjustable stent with buckle structure

Abstract

The invention discloses an adjustable stent with a buckle structure. The adjustable stent comprises a stent body with a cavity and elastic buffer ribs arranged on the stent body; the stent body is formed by spirally winding a single metal wire or a plurality of composite metal wires, or is formed by 3D printing of an elastic polymer material, and has an axial compression structure and an axial expansion structure; the buffer ribs are in a slender S shape and are fixed on the outer surface or the inner surface of the stent body in a spot welding or bonding mode; when the stent is axially compressed or expanded, the buffer ribs are correspondingly compressed or expanded along with the stent body; the number of the buffer ribs is two, and the buffer ribs are symmetrically arranged along the central axis of the stent; one end of each buffer rib is attached to the first end of the stent body, the other end of each buffer rib is attached to the second end of the stent body, the first end and the second end of the stent body are arranged more closely than the middle section and are stacked ends formed by tightly winding wires for 2.5 circles; and the slender S-shaped buffer ribs have supporting and buffering effects.

Description

technical field [0001] The invention relates to the technical field of implantable stents in the body, in particular to an adjustable stent with a buckle structure. Background technique [0002] At present, common cardiovascular and cerebrovascular diseases mainly include arterial stenosis, aneurysm, etc. Cardiovascular and cerebrovascular diseases are one of the important causes of human death, and stent intervention is one of the main means of treating cardiovascular diseases, and it is widely used clinically. Vascular stents mainly include bare metal stents and drug-eluting stents. Bare metal stents have achieved remarkable curative effects after entering clinical treatment, but after more than ten years of application, some shortcomings and disadvantages have gradually been exposed, such as prone to thrombosis, high restenosis rate, and damage to vessel walls, etc. Clinical studies have shown that the incidence of in-stent restenosis 6 months after bare metal stent impl...

AI Technical Summary

Problems solved by technology

Bare metal stents have achieved remarkable curative effects after entering clinical treatment, but after more than ten years of application, some shortcomings and disadvantages have gradually been exposed, such as prone to thrombosis, high restenosis rate, and damage to vessel walls, etc. Clinical studies have shown that the incidence of in-stent restenosis 6 months after bare metal stent implantation is as high as 20% to 30%.

The application of drug-eluting stents has reduced the restenosis rate to less than 10% within one year after surgery, but clinical studies have shown that drug-eluting stents have poor long-term efficacy and are prone to thrombosis, and the mortality rate or incidence of myocardial infarction is relatively low. high

In-stent restenosis has seriously affected the quality of life and health of patients, and it is a technical problem that needs to be solved urgently

[0003] Most of the stents in the prior art are laser-cut tubular stents. Although there are also wire-woven mesh stents, a large number of different stents are used in different treatment processes, and these stents can be delivered to the diseased part of the blood vessel through a catheter , such as: vascular stenosis, hemangioma, arteriovenous fistula and other abnormal blood vessels; the stents in the prior art are mostly laser-cut tubular stents, although there are also wire-woven mesh stents, but the actual surgical situation is sometimes more complicated. The shape and position of most stents after release are unsatisfactory, unable to meet the requirements of the treatment itself, and often need to be recovered into the catheter or sheath for secondary positioning and release.

However, at present, some stents cannot realize the functions of recyclability and repeatable positioning; while some can only realize the function of partial recovery, but cannot meet other requirements

[0004] In addition, local vascular injury caused by expansion of stent implantation is one of the root causes of in-stent restenosis, while the expansion of existing bare metal stents, drug-eluting stents, and biodegradable stents will cause different degree of vascular injury, and there is still insufficient stability after implantation. In view of the defects of the above-mentioned stents, it is necessary to design and invent an ideal vascular stent that is more in line with clinical requirements.

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