Thrombus extraction stent and thrombus extraction device

Abstract

The invention relates to the technical field of medical apparatuses for internal medicine, and in particular to a thrombus extraction stent and a thrombus extraction device. The thrombus extraction stent comprises a stent main body which achieves self-expanding in a circumferential direction of a longitudinal axis, wherein the stent main body comprises a distal portion, a middle portion and a proximal portion connected to a push rod, and the distal portion, the middle portion and the proximal portion are sequentially connected; the distal portion comprises first closed-loop net units; the plurality of first closed-loop net units are mutually connected, so that a sleeve structure is defined; the middle portion comprises a plurality of second closed-loop net units; the plurality of second closed-loop net units are mutually connected, so that a sleeve structure is defined; the proximal portion comprises a plurality of third closed-loop net units; the plurality of third closed-loop net units are mutually connected, so that a taper-tube structure is defined; and both the first closed-loop net units and the third closed-loop net units are less than the second closed-loop net units in meshes. The invention also provides the thrombus extraction device. Due to small-mesh design of the distal portion and the proximal portion, thrombus displacement and falling-off are prevented from easily occurring in a withdrawal process. With large-mesh design of the middle portion, a thrombus can be conveniently taken out as a whole body.

Description

technical field [0001] The invention relates to the technical field of internal medicine medical devices, in particular to a thrombus retrieval bracket and a thrombus retrieval device. Background technique [0002] Stroke, also known as apoplexy, is a group of acute cerebrovascular diseases with cerebral ischemia and hemorrhagic injury symptoms as the main clinical manifestations, because of its high morbidity, high mortality, high disability rate, high recurrence rate and High economic burden and other characteristics seriously endanger the life, health and quality of life of the public. [0003] Stroke is divided into two types: ischemic stroke and hemorrhagic stroke, and ischemic stroke accounts for 70% to 80%. In patients with ischemic stroke, intracranial large vessel occlusion caused by various reasons has the most serious consequences and has always been a difficult point in treatment. The current treatment methods include intravenous drug thrombolysis, arterial drug...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a thrombectomy support, through the small mesh design of the distal end and the large mesh design of the second closed-loop mesh unit in the middle, it solves the problem that the radial support force is relatively weak when catching thrombus in the prior art. Small, the problem that the thrombus is easy to fall off when the stent body is withdrawn

[0007] Another object of the present invention is to propose a thrombus removal device, which solves the problem that the thrombus is easy to fall off when the thrombus removal device in the prior art is working, and the wall adhesion and flexibility are poor, and it is easy to cause spasm of the cerebral blood vessels of the patient.

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