A tapered vascular stent suitable for main branches of bifurcated vessels

Abstract

The invention provides a conical intravascular stent suitable for the main branch of a furcate blood vessel. The conical intravascular stent comprises two groups of axial support bodies, a plurality of groups of annular support bodies, radial connectors for connecting the two axial support bodies, axial connectors for connecting adjacent annular support bodies, adjustable bent connecting bars and circular arc segments, wherein the stent is provided with branch openings; the intervals L from the wave crests to the wave troughs of the axial support bodies are sequentially reduced from the near end to the far end, and the opening angles alpha of the annular support units are sequentially increased from the near end to the far end, so that the stent forms the conical shape after expanding. During the expansion, one balloon is adopted, so that the problems of guide wire winding, overhigh metal load at the branch openings, unsmooth blood flow, and the like are solved, meanwhile, the physiological feature that the real blood vessel has the taper from the near end to the far end is well adapted, the poor wall-attaching property at the near end of the blood vessel and the overexpansion at the far end of the blood vessel of the stent are improved, moreover, the axial strength and expansion uniformity of the intravascular stent are also improved, the axial shortening ratio of the stent is reduced, and the accurate locating is guaranteed.

Description

technical field [0001] The invention belongs to the field of medical equipment, and relates to a balloon-expandable vascular stent for treating bifurcation diseased blood vessels by using percutaneous coronary artery vascular stent intervention. Background technique [0002] In recent years, interventional therapy for coronary heart disease and other cardiovascular diseases has replaced traditional drug therapy and surgery as the main treatment method for cardiovascular diseases due to its remarkable minimal invasiveness and high efficiency. [0003] Coronary artery bifurcation lesions are a common type in patients with coronary heart disease, accounting for about 15-20% of all lesions. The complexity and variety of classification of bifurcation vascular lesions are a major feature. For example, according to the classification of plaque distribution, the main branch and branch need to be considered Whether there are lesions separately or simultaneously. Therefore, different...

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Problems solved by technology

[0004] However, it has been confirmed by anatomy and clinical practice that in most cases, the use of double-stent technology to implant stents will easily cause overlapping of stents, resulting in heavy metal loads, increased circumferential stress of blood vessels, deformation and insufficient expansion of branch stents during expansion, and scratches. Vascular; kissing balloon dilatation may cause oval deformation, damage proximal segment coating, change strut configuration, cause high wall stress; most vessels taper proximally to distally, and main branches of bifurcated vessels are at bifurcation The diameter decreases faster near the opening. There is a gap between the diameters of the two ends. Implantation of cylindrical stents may cause proximal malapposition and distal overexpansion.

All of the above will cause vascular injury, intimal hyperplasia, increase the incidence of in-stent restenosis and even myocardial infarction

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