A step-shaped balloon-expandable vascular stent

Abstract

The invention provides a stepped balloon dilatation vascular stent. The stepped balloon dilatation vascular stent comprises N stent segments with different dilatation calibers, wherein the adjacent stent segments are connected by transition regions; each stent segment comprises a plurality of ring-shaped support bodies, and the adjacent ring-shaped support bodies are connected by connecting bars; the ring-shaped support bodies are sequentially arranged in the axial direction of the vascular stent; the adjacent ring-shaped support bodies are in mirror symmetry distribution; each ring-shaped support body comprises a plurality of sine unit waves in the same shape, and the unit waves are sequentially arranged in the circumferential direction of the vascular stent. According to the stepped balloon dilatation vascular stent, the axial flexibility and the radial rebound rate of the vascular stent are drawn into consideration by changing the dilatation calibers and the step number of the stent segments, the wave heights and widths of the unit waves and the connecting modes of the transition regions between the stent segments, so that the service life of the vascular stent is prolonged, and vascular stent adherence un-favorability, vascular stent thrombosis and other interventional postoperative complications can be prevented.

Description

technical field [0001] The invention relates to a balloon-expandable vascular stent for the treatment of carotid arteries, femoral arteries, and other coronary arterial lesion vessels with side branches and bifurcations by means of percutaneous coronary artery stent intervention in the technical field of medical equipment manufacturing, and specifically relates to a A ladder-shaped balloon-expandable vascular stent. Background technique [0002] Nowadays, the number of patients with cardiovascular and cerebrovascular diseases is increasing. The World Health Organization indicates that cardiovascular disease has become the most serious disease that endangers human life safety. Among them, the morbidity and mortality of coronary heart disease rank first among all kinds of diseases. At present, ischemic death due to extracranial carotid atherosclerotic stenosis is gradually increasing, and stent implantation has become an effective alternative to carotid endarterectomy because ...

AI Technical Summary

Problems solved by technology

At present, the structural design of the stent in the market and clinically adopts the design with the same parameter value, that is, the structure of the vascular stent is uniform cylindrical, the expansion diameter of the stent section is the same, and the ring support body of the same shape is used, that is, the ring support body The wave height and width of the unit wave are consistent, which makes the whole stent present a consistent cylindrical shape when expanded, causing serious damage to the tributary vessel wall of the bifurcated vessel with a large difference in vessel diameter

Even when the stepped balloon is used, there are still some disadvantages, for example: the traditional stent is used on the trapezoidal balloon. The stress of the stent is often large, while the stress of the stent in the contact with the small-diameter end of the trapezoidal balloon is often small. Due to the serious uneven stress distribution on the entire stent, it is easy to induce fatigue damage to the stent, thereby greatly shortening the service life of the stent That is, the service life

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