Pushing sheath tube for intracranial self-expanding bracket conveyer

Abstract

The invention relates to a push-delivery sheathing canal used in an intracranial self-expandable stent conveyer, which pertains to a medical apparatus technical field and is characterized in that: stainless steel tube with the length equal to two thirds height of a grown-up, the external diameter less than the inside diameter of human blood vessel and an end providing with a photographic loop is adopted; the end of the stainless steel tube props a contractive net-type sent positioned in a conduit of an outer sheathing canal; the push-delivery sheathing canal is formed; the thickness of tube wall of the formed push-delivery sheathing canal becomes thinner successively from proximal end to the distal end. Or the stainless steel tube transmural spiral scroll is cut out and the thread pitch of the shear mark becomes narrower successively. Or the stainless steel tube is connected with the medium part and the distal part (of the push-delivery sheathing canal) which are composed of a spring formed by elastic metal material tightly entwined without any gap so as to form various series of structures which can meet different requirements; the push-delivery sheathing canal of the invention has enough pliability and ensures the positioning accuracy in stent release; since the two problems are solved, the push-delivery sheathing canal of the invention can be adopted for practical application.

Description

technical field [0001] The invention belongs to the technical field of medical devices, specifically relates to an interventional therapy device technology for treating cerebral artery hemangioma and cerebral artery stenosis. Background technique [0002] At present, for the treatment of intracranial aneurysms, in addition to direct surgical clipping, interventional aneurysm embolization is used. The commonly used technique is coil embolization. One or more coils are implanted into the aneurysm by interventional methods. When the volume occupied by the coils reaches a certain proportion of the entire aneurysm volume, the blood flow rate in the aneurysm gradually decreases. , Finally, a thrombus is formed in the aneurysm close to the coil, and the thrombus is organized into a solid body to seal the aneurysm, thereby preventing the aneurysm from rupturing. However, for wide-necked aneurysms, the clinical effect of single coil embolization is not good. One of the main reasons ...

AI Technical Summary

Problems solved by technology

Because making it too hard is not only difficult to pass through the blood vessels, but also causes vasospasm, resulting in catastrophic accidents

However, if the push sheath is made too soft and the gap between the inner and outer sheaths is too large, the pushing force and rigidity of the push sheath will be affected.

That is to say, when the push sheath is under pressure, the push sheath is retracted, so that the pushed stent is displaced, resulting in inaccurate release and positioning of the stent

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