Abdominal aorta covered stent and conveying device thereof and using method

Abstract

The invention relates to an abdominal aorta covered stent and a conveying device thereof and a using method. The abdominal aorta covered stent comprises a main body stent and lengthened stents. The main body stent comprises a metal framework and a laminating film. The metal framework comprises a plurality of elastic metal rings. The near-end of the main body stent is provided with a bare stent which is uncovered with the laminating film an can shrink inwards, the bare stent is in a W shape and has two primary wave crests, a secondary wave crest and two troughs. The top ends of the adjacent primary wave crests are provided with first fixed rings, the bottoms of the first fixed rings are provided with first barbs, the top end of the secondary wave crest is provided with a second fixed ring, and the top end of one of the two troughs is provided with a second barb. The rear end of the main body stent is provided with a first branch stent and a second branch stent. The top ends of the two lengthened stents are fixedly connected with the inside of the far-ends of the first branch stent and the second branch stent respectively through anti-dropping structures. The abdominal aorta covered stent can be used for intracavitary therapy of abdominal aortic aneurysm and can reduce occurrence rate of adverse events such as shifting and endoleak after implantation of the stent.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an abdominal aortic stent graft, a delivery device and a use method thereof. Background technique [0002] Abdominal aortic aneurysm is an aneurysm-like expansion of the abdominal aorta, which is caused by a localized expansion of the abdominal aorta due to sclerosis, injury, infection, etc., and slowly appears tumor-like under the impact of high-pressure blood flow. After a long period of expansion of the abdominal aorta, the blood vessel wall becomes very fragile and is very prone to rupture. Once the abdominal aortic aneurysm ruptures, it will inevitably cause massive bleeding, which is known as the "bomb" in the body. With the increase of population aging, the improvement of people's living standard and the continuous improvement of medical level, the incidence and detection rate of abdominal aortic aneurysm have been increasing year by year. [0003] The...

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Problems solved by technology

[0006] 2. It is easy to cause the proximal renal artery occlusion of the aneurysm neck

Especially for the patient structure with a large angle between the aneurysm neck and the long axis of the aneurysm, most of the existing stent graft structures only have the design that the stent graft is displaced downward by the blood flow, and the aneurysm neck is not considered. When the angle with the long axis of the aneurysm is large, the side of the lesser curvature moves up after the stent graft is implanted, causing the stent graft to partially block the opening of the renal artery, resulting in renal ischemia

[0007] 3. After the barbed bare stent is released, the impact force on the blood vessel wall is too large, causing damage to the blood vessel wall

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