stent graft

Abstract

The invention relates to a covered stent. The stent comprises a near-end support section, a far-end support section and a recessed section. The recessed section comprises a recessed part recessed close to a vertical center shaft of the covered stent. The recessed part is provided with at least one through hole used for inserting branch stents and comprises a bottom surface, a near-end peripheral surface and a far-end peripheral surface. The recessed part further comprises at least one group of support parts comprising near-end bent parts arranged on the near-end peripheral surface and far-end bent parts arranged on the far-end peripheral surface. The covered stent has the following beneficial effects: when the covered stent is implanted into a body and the recessed part bends towards the arch bend of the aorta, no deformation or smaller deformation occurs on the near-end peripheral surface and the far-end peripheral surface of the recessed part so that the distance between the bottom surface of the recessed part and a blood pipe wall is ensured; therefore, blood flows can flow through a pipe cavity of the covered stent through the through holes into the recessed part and flow into branch blood vessels; and therefore, the branch stents can smoothly flow through the through holes and corresponding branch blood vessels.

Description

technical field [0001] The invention relates to the technical field of interventional medical devices, in particular to a covered stent for implanting a thoracic aorta. Background technique [0002] With the sharp increase in the incidence of hypertension, the incidence of arterial-related diseases has increased significantly, and is expected to increase at a rate of more than 40% in the next 5 to 7 years. Among them, acute Stanford type A aortic dissection (acute aortic dissection type A, referred to as AADA) is the most common and dangerous aortic emergency in the field of cardiovascular surgery. If left untreated, the mortality rate of AADA one week after onset is as high as 50-91%. If only conservative medical treatment is received, the 24-hour mortality rate can reach 20%, and the 48-hour mortality rate can reach 30%. Therefore, once AADA is diagnosed, emergency surgical intervention is necessary if there are no surgical contraindications. However, even under modern m...

AI Technical Summary

Problems solved by technology

[0006] However, when the radial recess distance of the recessed portion along the aortic stent vessel is large, although a large space is reserved to facilitate the implantation of the branch stent, the space corresponding to the recessed portion of the aortic stent vessel changes accordingly. Therefore, the blood flow supply of the aortic stent will inevitably be affected, which will spread to the brachiocephalic trunk and abdominal aorta, causing corresponding complications

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