Covered stent

Abstract

The invention provides a covered stent which comprises a cylindrical covered stent body. A plurality of middle covered stent units are sequentially connected to the near end and / or the far end of the covered stent body in a sleeved mode, and each middle covered stent unit comprises a tubular covering film and an annular stent body fixed to the surface of the near end of the covering film, wherein parts of adjacent middle covered stent units are overlapped. By means of the structure, the covering films forming the middle covered stent units are arranged in the overlapped mode, and in this way, the sealing effect on the near end and / or the far end of the covered stent body can be easily improved; meanwhile, the arrangement density of the stent bodies located at the near end and / or the far end of the covered stent body can be improved, the radial supporting force can be easily increased, and the covered stent can be effectively prevented from being shifted. In addition, the bending or arrangement flexibility of the near end and / or the far end of the covered stent can be improved, the covered stent can be well matched with the blood vessel wall or the tumor neck accordingly, and inner leakage is prevented from being formed at the end of covered stent.

Description

technical field [0001] The invention relates to a covered stent. Background technique [0002] Aneurysm is a very dangerous vascular disease clinically. Therefore, once an aneurysm is found, it should be treated as soon as possible. At present, the minimally invasive interventional therapy technology using the principle of intracavitary isolation has been widely used. It uses a delivery system with a small diameter to deliver the compressed stent graft to the position of the diseased blood vessel and release it accurately. Covering the diseased vessel segment, isolating the aneurysm cavity and forming a new blood flow channel; after the aneurysm loses blood supply, the residual blood in the aneurysm cavity gradually forms a thrombus and muscularizes into vascular tissue, and the expanded aneurysm wall shrinks due to negative pressure , and gradually return to the original shape, so as to achieve the purpose of treating aneurysms. This technique greatly reduces surgical tra...

AI Technical Summary

Problems solved by technology

[0003] However, during the treatment process, the ends of the existing stent-grafts are easily bent and deformed after being released, which deteriorates the adhesion between the stent-graft and the vessel wall or neck of the tumor, and easily leads to displacement of the stent-graft and Endoleak

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