Covered stent

Abstract

The invention discloses a covered stent, which comprises a support structure and a tectorial membrane unit, and is characterized in that: the tectorial membrane unit comprises an inner-layer tectorial membrane and an outer-layer tectorial membrane which coats the support structure; the outer-layer membrane coats on the outer side of the inner-layer tectorial membrane; the inner-layer tectorial membrane is a biological membrane with good blood compatibility, and the outer-layer tectorial membrane is a biological membrane which is easy to induce the formation of thrombus; the inner-layer tectorial membrane contacting blood has good blood compatibility, can effectively reduce the formation of the thrombus, and maintains normal blood flowing channels; and the outer-layer tectorial membrane can induce the formation of the thrombus in aneurysm or thrombus of bleeding parts, promotes the aneurysm to be quickly activated and reduced, reduces the mass effect in vivo, simultaneously effectively adheres endothelial cells, promotes differentiation and proliferation of cells, quickens the endothelialization of lesion parts of vessels, and can more effectively treat vascular diseases such as the aneurysm and the like.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a covered stent for treating vascular diseases. Background technique [0002] Common vascular diseases include aneurysm, vascular rupture, vascular perforation, vascular dilatation and other diseases. Aneurysms are caused by diseases, injuries or congenital factors that cause the arterial wall to become weak locally. Under the impact of blood flow, the weak point of the arterial wall protrudes outwards and gradually expands to form an aneurysm. Round, oval, or prismatic cystic enlargement. Aneurysm is a potentially life-threatening disease. Under the impact of blood flow, aneurysm grows continuously, compressing surrounding organs or tissues and causing symptoms; aneurysm rupture due to increased blood pressure or other factors causes rapid bleeding. Aneurysms can occur in different parts of the body, the most common being abdominal aortic aneurysms and intracranial aneurysms. ...

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the existing covered stent only isolates the blood flow at the lesion site of the aneurysm from the normal blood circulation through the physical isolation of the covering, and forms a new blood flow channel inside the covered stent. The covered stent only has the function of isolating The role of aneurysm disease requires self-healing of the aneurysm lesion to achieve aneurysm treatment, and active treatment of the lesion cannot be implemented. Therefore, using the covered stent to treat aneurysms has slow results and poor therapeutic effect

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