Covered stent

Abstract

The invention provides a covered stent, which comprises a tubular covered membrane and at least one first stent unit connected with the end of the covered membrane, each first stent unit comprises first wave rings and second wave rings, and the first wave rings and the second wave rings are overlapped to form a plurality of intersection points; wherein each of the first wave ring and the second wave ring comprises a plurality of wave crests and a plurality of wave troughs, at least one sewing knot is arranged at at least one of the adjacent wave crests and wave troughs, and at least one sewingknot is arranged at the intersection point. According to the covered stent, the first stent unit is tightly sewn with the covered membrane, so that the adherence of the stent and the sealing performance of the covered stent are greatly enhanced, the problem of covered membrane flanging of the covered stent is solved, the use safety of the implanted stent is guaranteed, and I-type inner leakage isavoided.

Description

technical field [0001] The invention relates to the field of implanted medical devices, in particular to a covered stent. Background technique [0002] Aortic aneurysm and aortic dissection are extremely dangerous diseases, mainly divided into aortic dissection, aortic true aneurysm, and aortic pseudoaneurysm. The mortality rate of aortic disease is greater than 50% 48 hours after the onset, and greater than 5% 2 weeks after the onset, which has seriously threatened human health. With the arrival of the aging trend in China, the incidence of aortic aneurysm and aortic dissection will continue to rise. [0003] For aortic disease, the main treatment at present is artificial vascular graft. Therefore, a large number of artificial vascular stents are clinically required as vascular substitutes. At present, stents made of polyester (PET), polytetrafluoroethylene (PTFE), natural silk and other artificial materials have been used clinically, and satisfactory results have been a...

AI Technical Summary

Problems solved by technology

After the stent is implanted, if the metal stent shifts or warps, not only the shape of the stent and the therapeutic effect are not good, but also type I endoleak is likely to occur, and a second intervention is required to ensure the therapeutic effect of the operation, which increases the cost of surgical treatment. time, increasing the difficulty of the operation and the risk of intraoperative trauma to the patient

In addition, the displacement of the metal stent and the tilting of the metal stent can easily cause damage to the patient's own blood vessels

[0005] Based on this, it is necessary to provide a stent graft with good wall-adherence, which can solve the problem of the flanging of the stent graft, so that type I endoleak is not easy to occur after the stent is implanted in the human body.

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