Thrombus taking stent, preparation method of thrombus taking stent and thrombus taking device

Abstract

The invention relates to medical instruments, in particular to a thrombus taking stent, a preparation method of the thrombus taking stent and a thrombus taking device. The thrombus taking stent mainlycomprises a stent body produced with a shape memory alloy as a raw material, a hydrophilic layer is arranged on the outer surface of the stent body, and a micro-nano porous structure layer is arranged on the inner surface of the stent body. Under the structure that the diameter of the stent body is smaller than 2 mm, the effects of optimizing the grabbing capacity of the stent body and minimizingthe damage effects on blood vessel walls can be achieved, the operation performing difficulty and time can be reduced and shortened to a great extent during an operation, and the operation efficiencycan be effectively improved.

Description

technical field [0001] The invention relates to medical devices, in particular to a thrombus retrieval bracket, a preparation method thereof, and a thrombus retrieval device. Background technique [0002] Acute ischemic stroke is a cerebrovascular disease with high disability rate and high fatality rate, and its diagnosis and treatment methods have always been a hot spot for medical personnel to explore. Once ischemic stroke occurs, treatment must be carried out within the effective time window, which can be accomplished by pharmacological elimination of thromboembolism and mechanical elimination of thromboembolism. [0003] Pharmacological elimination can be achieved by intravenous injection of rt-PA or urokinase to dissolve thrombus, or by intra-arterial exposure to thrombolysis, anti-platelet aggregation and anticoagulant drug therapy. However, there are some unresolved problems in drug thrombolysis: firstly, the time window of thrombolysis is short. According to the res...

AI Technical Summary

Problems solved by technology

However, there are some unresolved problems in drug thrombolysis: firstly, the time window of thrombolysis is short. According to the research of the National Institute of Neurological Disorders and Stroke in the United States, intravenous thrombolysis should be performed within 3 hours of onset, and the time window of arterial thrombolysis It should be within 6 hours, and such a short thrombolysis time window results in only 4.5%-6.3% of patients receiving thrombolysis; secondly, the recanalization time of drug thrombolysis is long, and the recanalization time may affect clinical One of the important factors of prognosis, whether it is intravenous thrombolysis or arterial thrombolysis, the recanalization time needs at least 1-2 hours, and there are large sequelae; in addition, some patients are not suitable for thrombolysis

[0007] It is not difficult to find that most of the existing thrombectomy stents focus on the improvement of the geometric parameters of the unit structure, and there are few studies on the surface modification of the stent material, that is, how to increase the distance between the stent and the vessel wall by modifying the stent. Lubrication properties, and the study of enhancing the grasping ability of stents to thrombus are relatively few

Images