Artery capturing and thrombus extraction stent and thrombus extraction device

Abstract

The invention belongs to the technical field of medical devices and particularly relates to an artery capturing and thrombus extraction stent and a thrombus extraction device, wherein the thrombus extraction stent comprises a mesh-tube shaped stent body which is formed by connecting multiple meshes; the stent body comprises a proximal end, a middle main body part and a distal end which are integrally formed and are connected with one another in a smooth transition manner, folds under the action of an external force and the stent body is released and recovered after the external force is eliminated; the proximal end of the stent body is in an approximately triangular shape after being laid and spread; the middle main body part is in an approximately rectangular shape after being laid and spread; and the distal end is of a blast cap shaped structure after being laid and spread. When the stent body is in a releasing state, the proximal end is of a conical structure with smaller proximal portion and larger distal portion, the middle main body part is of a cylinder structure, and the distal end is of tuck net structure with closed tail end. The thrombus extraction device comprises the artery capturing and thrombus extraction stent and a push-pull guide wire; and the stent body can be recovered into a thrombus extraction micro-catheter under the action of the push-pull guide wire. The artery capturing and thrombus extraction stent and the thrombus extraction device provided by the invention can prevent thrombus from escaping, increases the thrombus capturing rate and thus improves clinical prognosis and the life quality of a patient.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an arterial grabbing thrombus bracket and a thrombus removal device. Background technique [0002] Thrombus is a clot formed by blood in the heart of the cardiovascular system or on the surface of a blood vessel outside the heart under pathological conditions. It is generally composed of red blood cells, fibrin, platelets, and white blood cells in different proportions. Ischemic stroke caused by thrombosis in the cerebral vessels is a refractory disease that seriously endangers human health and life safety. According to statistics, there are 3 million stroke patients in China every year, and 1.2 million stroke patients die every year. At present, the number of stroke patients in my country is The incidence rate is increasing at an annual rate of 8.7%. The number of deaths due to stroke in China has surpassed tumors and cardiovascular diseases and has become the...

AI Technical Summary

Problems solved by technology

However, as far as the mechanical thrombectomy device is concerned, there are still many problems in the process of thrombectomy: for example, most of the thrombectomy devices are designed with fewer development points, and the contact between the thrombectomy device and the thrombus cannot be clearly observed during the thrombectomy process. The position and shape of the thrombus cannot be clarified, resulting in a low capture rate of the thrombus

And the existing device type is fixed, and the size of the stent mesh and the diameter of the nickel-titanium alloy wire that constitutes the stent are also fixed between different models and in the same stent, which will cause the radial support force to be fixed, which cannot adapt to the brain. The specific requirements of different diameters and different anatomical parts of blood vessels in the vascular system will lead to failure of thrombectomy and damage to the vessel wall

The focus and difficulty of this treatment method lies in the capture and capture of the thrombus by the thrombus retrieval device used in the operation and how to avoid the damage to the vessel wall during the operation, because the damage to the vessel wall will lead to the reocclusion of the vessel, thus making clinical poor prognosis

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