Asymmetric intravascular stent

Abstract

The invention provides an asymmetric intravascular stent. The asymmetric intravascular stent comprises a plurality of annular supports and connecting ribs, wherein every two annular supports are connected through the corresponding connecting rib. The annular supports are arranged in the longitudinal direction of an intravascular stent body in sequence, and each annular support comprises a plurality of sinusoidal unit waves which are arranged in the circumferential direction of the intravascular stent body in sequence; the widths of the connecting ribs keep constant, the rib widths of the annular supports are regularly changed, that is, the rib widths of the annular supports are gradually increased from the upper ends and the lower ends to the middle ends at the same time, and in the axialdirection of the stent body, the rib widths of the annular supports are gradually increased from the far end to the near end. In the asymmetric intravascular stent, the characteristics that the circumferential thicknesses of the blood vessel are different and the axial thicknesses of the blood vessel are different are comprehensively considered, the adherence of the stent is improved, and the vascular stress and strain are reduced. Besides, a functionally graded material is adopted, while good supporting performance is ensured, the dog bone effects of a cobalt-chromium alloy stent and a stainless steel stent are greatly reduced, and the long-time curative effect of the stent is improved.

Description

technical field [0001] The invention belongs to the technical field of medical device manufacturing, and in particular relates to an asymmetric blood vessel stent. Background technique [0002] Coronary atherosclerotic heart disease is a heart disease caused by atherosclerotic lesions in the coronary arteries that cause stenosis or blockage of the vessel lumen, resulting in myocardial ischemia, hypoxia or necrosis. According to the statistical data analysis of the World Health Organization, cardiovascular disease has become the number one disease with the highest fatality rate. In recent years, due to the changes in people's lifestyles and the improvement of material living standards, the incidence of cardiovascular diseases has become higher and higher, and the incidence of cardiovascular diseases is showing a younger trend. Traditional cardiovascular disease treatment methods include drug therapy and surgical treatment. However, the effect of drug treatment is slow and t...

AI Technical Summary

Problems solved by technology

Clinically, vascular stents with a fixed thickness are often used, which will lead to uneven expansion of the stent, damage to the vessel wall, and lead to restenosis

In addition, the adherence performance of the stent cannot be guaranteed, the blood flow environment of the implanted segment is disturbed, and the remodeling of the blood flow environment is affected

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