Coronary stent

Abstract

The invention discloses a coronary stent. The coronary stent structurally comprises a tubular body structure which is formed by a first class circular unit and a second class circular unit alternatively arranged in sequence along an axial direction, wherein the tubular body structure comprises a bracket with an extensible property along a radius direction; the first class circular unit and the second class circular unit are circular units formed by U-shaped brackets which are provided with openings at one end along the axial direction and connected in series; the opening direction of the U-shaped opening of the U-shaped bracket adjacent to the circular units is an opposite direction; each U-shaped bracket is composed of a line segment and an arc segment, and the U-shaped bracket of the first class circular unit and a part of the corresponding arc segment adjacent to the U-shaped bracket of the second class circular unit are connected by a corresponding connection arc. The coronary stent has the characteristics of good endurance bending strength and high flexibility.

Description

technical field [0001] The invention relates to a coronary stent and belongs to the field of medical instruments. Background technique [0002] In recent years, for arterial blockage caused by atherosclerosis, the treatment method of implanting expansion stents and promoting blood flow has been rapidly popularized and brought good news to patients. This stent for treatment needs to meet three requirements. First, the closed stent is mounted on the distal end of the inflatable balloon catheter, and delivered to the blockage site along the guide wire pre-inserted into the artery. Therefore, it is required that the stent must have sufficient flexibility when passing through the narrowed artery. Secondly, the expanded stent should have enough supporting force to support the artery wall, and enough strength to keep the stenosis open, and must have the fatigue strength to withstand the bending load caused by the heart pulse. Third, the length of the balloon-expanded stent is sh...

AI Technical Summary

Problems solved by technology

Third, the length of the balloon-expanded stent is shorter than the length of the crimped state, that is, the length of the stent will be shortened after expansion, which may prevent the treatment from covering the entire lesion area, so it is required that the length of the stent before and after expansion does not change much

[0008] image 3 , other stents shown in 8 and 9 also have defects in expansibility

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