Compound netty stent

Abstract

The invention relates to a netty stent for endovascular treatment. An existing technical scheme for treating vascular dilation diseases by the aid of a netty stent includes that a plurality of netty metal stents are coaxially overlapped and metal thin wires are woven three-dimensionally, so that a three-dimensional netty stent is formed, the principle includes that the disorder state of blood in a dilated blood vessel cavity is changed by the netty stent, and lesions are promoted to be repaired by a natural blood coagulation mechanism. The technical scheme of the invention includes that on the basis of an existing vascular laminating film stent consisting of an elastic supporting frame and a laminating film, a flow limiting screen with a flexible three-dimensional structure is used for replacing the laminating film, and the supporting frame and the flow limiting screen are compounded internally and externally so as be connected integrally. The compound netty stent further can be manufactured into a separate combined type or integral branch stent. The compound netty stent has the advantages that the compound netty stent is easy in manufacture and flexible in implantation, and an anatomy channel of a lesion blood vessel can be recovered.

Description

technical field [0001] The invention relates to a medical device, more specifically, to a mesh support for intravascular treatment. Background technique [0002] In recent years, with the continuous development of endovascular treatment technology, various types of stent grafts have been widely used. The main structure is a foldable channel composed of a metal support frame and an artificial vascular membrane covering its inner or outer wall. The treatment principle is to use the pipeline structure formed by the stent to isolate the dilated vascular disease and blood flow, so as to avoid the expansion and rupture of the diseased blood vessel and ensure the smooth flow of the blood vessel access. The use of the stent has achieved good results in isolating various aneurysms and arterial dissections to prevent the enlargement and rupture of the aneurysms and dissections. Its disadvantage is that when the shape or location of the lesion is not suitable for endovascular exclusio...

AI Technical Summary

Problems solved by technology

Its disadvantage is that when the shape or location of the lesion is not suitable for endovascular exclusion, such as the proximal end of the aneurysm or the dissection opening is adjacent to important blood vessel branches, the neck of the aneurysm is too short to provide enough space for the proximal end of the graft. Anchoring, or when the lesion involves extensive thoracoabdominal aorta, or when aortic dissection involves important branch vessels such as the brachiocephalic trunk, left common carotid artery, left subclavian artery, and celiac trunk, the graft should be placed in the isolated tumor body At the same time, it will also obscure these branch vessels, resulting in serious consequences

The disadvantages of this kind of stent are: firstly, the multilayer metal hard stent has a large volume after shrinkage and needs to be assembled in a guide sheath with a large diameter, which is not conducive to the delivery of the graft; secondly, when this kind of graft is used in tube Multi-layer hard stents will make the diameter of the vessel narrower

Finally, once the stent mesh at the branch vessel is blocked in the long-term, due to the characteristics of its own metal hard stent, it will become impossible to recanalize the vascular intervention at the branch entrance, and an intervascular intervention has to be performed. open surgery

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