Stent Graft

Abstract

The invention provides a stent-graft, comprising a stent body and a film, the stent body is arranged on the surface of the stent body, the stent body includes a main body stent part and a branch stent part, two branch stent parts and a main body stent part are connected with each other The covering film is fixedly connected and forms a Y-shaped structure. The stent body includes several annular stent segments arranged at intervals in the axial direction. and the transition zone; the outer diameter of the transition zone decreases from the proximal end to the distal end; the main body zone has the same outer diameter; the outer diameter of the proximal end of the transition zone is the same as the outer diameter of the main body zone; The proximal sealing area includes a proximal sealing bracket section, the transition area includes a transition bracket section, and the main body area includes a main body bracket section; the maximum length of the wave rod of the proximal sealing bracket section is less than that of the main body bracket section The length; this configuration improves the flexibility of the covered stent and reduces the risk of endoleak and displacement.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a covered stent. Background technique [0002] As a minimally invasive treatment, vascular interventional therapy improves the survival probability for patients with vascular diseases who cannot tolerate surgery. There are many bifurcation points of blood vessels in the human body, and some lesion areas of aneurysms or dissections will involve the bifurcation points of blood vessels and their branches. Taking the abdominal aorta as an example, the distal end of the abdominal aorta bifurcates into two iliac arteries. For cases of abdominal aortic aneurysm or dissection, conventional vascular interventional surgery will use the main body stent (placed at the abdominal aortic lesion) and branch stent (placed at the bilateral iliac artery lesion) to splice in vivo in the lesion area It is more effective to reconstruct the blood flow channel, especially when the lesion invol...

AI Technical Summary

Problems solved by technology

Most of the main body stents are designed with barbs, and the barbs puncture the blood vessels for anchoring. However, this treatment method requires three independently formed stents, which increases the cost of the operation, and the splicing between the stents also increases the risk of endoleaks at the splicing sites. risk, but also prolong the operation time, which is not good for the patient

At present, there are also a very small number of integrated stent products, but these products adopt a braided structure as a whole, have a large crimping size, poor flexibility, and high risk of internal leakage, and there are also shortcomings such as long-term displacement.

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