A composite function intravascular stent

Abstract

The invention discloses an intravascular stent with complex functions. The intravascular stent comprises a stent main body which is mesh-shaped and can be released from and retracted to a feeding catheter, wherein a near end of the stent main body is openly conical, the middle part of the stent main body is circular tube-shaped, and a far end of the stent main body has a closed structure; and the stent main body has a mesh shape which is woven by single wires or a plurality of wires or is engraved by a laser engraving machine. The stent which is taken as an acute thrombus removal system can quickly and efficiently take out thrombi, and can also capture small thrombi which flow toward the far end so as to avoid secondary stroke caused by the thrombus blockage of the far end; the stent which is taken as a temporary stent expands intracranial blood vessels or narrow and blocked blood vessels on other parts of human bodies, plays the effects of dredging and reconstructing blood flow, and can capture small thrombi or emboli; and the stent which is taken as a long-term implanted stent performs adjuvant therapy on arterial aneurysms of furcations, and fills in a market gap. If the position of the stent is not satisfactory, the entire stent can be retracted to the feeding catheter, and is released again. The maneuverability of the stent is high, so the operation difficulty is reduced, and the surgical success rate is greatly improved.

Description

technical field [0001] The invention relates to a composite function intravascular stent, which belongs to the technical field of medical devices. Background technique [0002] Stroke is a refractory disease that seriously endangers human health and life safety. According to statistics, there are 2.8 million stroke patients in China every year, and 1.5 million stroke patients die every year. There are 8 million survivors of stroke, 6 million of whom have lost their labor force and are unable to take care of themselves to varying degrees. For patients with cerebral apoplexy who are sent to the hospital in time, the conventional treatment plan is drug thrombolysis, but the active ingredients of many drugs are difficult to reach the lesion, so that the intended treatment purpose cannot be achieved. Secondly, the best window time for drug thrombolysis (the time from the onset of the disease to the time of treatment) is within 4 hours. Since most of the patients in our country l...

AI Technical Summary

Problems solved by technology

However, such an interventional operation is very difficult, the success rate is not high, and the long-term effect is not good, because two round tube-shaped stents placed side by side occupy most of the vascular space. Stenosis or even blockage of the blood vessel will occur in most of the stents, which will bring fatal danger to the patient

[0006] The Solitaire FR Device of the American ev3 company and the Merci Retrieval Device of the American Concentric Medical Company have several major shortcomings in common in actual clinical use: 1) Both of them have no distal vascular protection design, and small thrombus will peel off from the main body during use. Flow to more distal blood vessels, thereby blocking smaller blood vessels, causing secondary strokes, and even endangering the patient's life

However, the fatal disadvantage of this stent is that the wires at both ends are all tied tightly in the developing ring, forming a densely woven structure at both ends of the stent, so that after the blood flow enters the proximal end of the stent, the flow rate is greatly reduced, thereby promoting the formation of thrombus in the stent, resulting in In-stent occlusion, which also gradually occludes the vessel, poses a significant risk to the patient

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