Stent Graft

Abstract

The invention relates to a covered stent. The covered stent comprises a cover film (201) and a stent body (202) arranged outside the cover film in a sleeving mode, wherein the stent body comprises multiple stent rings (203) arranged in the axial direction at intervals, the proximal end of at least one stent ring (203) is attached to the outer surface of the cover film (201), and the telecentric end of at least one stent ring (203) is tilted outwards from the outer surface of the cover film (201). In this way, friction force between the stent body (202) and a vascular wall part can be increased through the titled telecentric ends of the stent rings (203), so that the covered stent can be anchored at a predetermined position more easily and displacement risk under blood flow impact can be reduced greatly.

Description

technical field [0001] The invention relates to the field of covered stents, in particular to a covered stent with the distal end of the stent ring raised. Background technique [0002] With the continuous development of science and technology, various types of aortic stent grafts for endovascular repair of aortic diseases are increasing. Covered stents refer to metal stents coated with special membrane materials (polytetrafluoroethylene, polyester, polyester, polyurethane, etc.). The membrane in it acts as an artificial blood vessel to guide the blood flow into each vessel branch, while the stent acts as a radial support and anchors the membrane. Covered stents not only retain the function of metal stents, but also have the characteristics of membrane materials. [0003] In the prior art, the stent and the graft are completely sutured or bonded, and the stent is integrally attached to the surface of the graft. The aortic covered stent will produce the following problems i...

AI Technical Summary

Problems solved by technology

[0004] 1. Displacement between the stent graft and the blood vessel is easy to occur, which will lose its effect and even cause other blood vessel blockage

In order to avoid the displacement of the stent, methods such as choosing a longer head-end anchoring area, increasing the radial support force of the stent, and adding barbs to the stent, etc., however, these methods will cause damage to the blood vessel;

[0005] 2. When bending, the fit between the stent graft and the blood vessel is reduced, resulting in increased pressure on the blood vessel wall and damage to the blood vessel;

[0006] 3. When the bending is too large, it is easy to cause the stent graft to collapse, which will lead to endoleakage in the stent graft and affect the treatment effect

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