Intracranial aneurysm embolism auxiliary stent and conveying system

Abstract

The invention belongs to the technical field of medical instruments, particularly relates to the field of A61F2/90, and particularly relates to an intracranial aneurysm embolism auxiliary stent and a conveying system. The intracranial aneurysm embolism auxiliary stent comprises a stent main body, the stent main body is of a hollow cylindrical structure, the side wall of the cylindrical structure of the stent main body is of a net structure, the far end of the stent main body is a closed-loop stent, the near end of the stent main body is an open-loop stent, and the axial length of the closed-loop stent accounts for 1/2-2/3 of the axial length of the stent main body. By the aid of the open-loop stent and the closed-loop stent, the stent can be partially released and recycled and has good wall attaching performance, bending resistance and displacement prevention performance.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to the field of A61F2 / 90, in particular to an auxiliary stent for intracranial aneurysm embolization and a delivery system. Background technique [0002] Intracranial aneurysms are mostly abnormal bulges that occur on the walls of intracranial arteries, and are the number one cause of subarachnoid hemorrhage. In cerebrovascular accidents, they rank second only to cerebral thrombosis and hypertensive cerebral hemorrhage. three. At present, the treatment of intracranial aneurysms is mainly divided into: simple spring embolization therapy, balloon-assisted coil therapy, stent-assisted coil therapy, and blood flow diversion device therapy. [0003] Among them, stent-assisted coil therapy is the mainstream aneurysm treatment method in clinical practice. There are two types of embolization-assisted stents, cut stents and braided stents. The metal coverage rate of the cut stent ...

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Problems solved by technology

However, the metal coverage is too high, and the crossing points between the braided wires are likely to cause thrombosis, leading to vascular embolism, and high postoperative complications

[0004] The main problems of embolization-assisted stents currently on the market are: 1. Cutting stent meshes are mainly divided into two types: closed-loop design and open-mesh design. The advantage of the closed-loop design is that the stent is partially released and can be recycled. The open-loop design of the stent cannot be partially released. Recycling; the advantage of the open-loop design is that the bracket has good wall adhesion, good bending resistance, and the bracket is not easy to shift. The closed-loop design bracket needs a special mesh design to improve its adhesion, bending resistance and anti-movement Generally speaking, these two performance closed-loop designs are still inferior

2. The development points of the cutting bracket are basically installed at both ends of the bracket, and the middle of the bracket is not developed. Due to the poor development of NiTi material, especially when the rod width is thin, the development in the middle of the bracket is not clear , so the actual situation of the stent in the blood vessel is often not observed, for example: the stent collapses in the curved blood vessel, folds, poor adhesion, etc., so it cannot be adjusted in time

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