Novel thrombus removal device with built-in barb structure

Abstract

The invention provides a novel thrombus removal device with a built-in barb structure. The thrombus removal device comprises a main body net barrel, a traction portion is arranged at the proximal endof the main body net barrel, multiple barbs warping towards the interior of the main body net barrel are arranged in net holes of the distal end of the main body net barrel, and the barbs are disposedin the circumferential direction of the main body net barrel. Each barb includes a barb top and protection portions on both sides of the barb top, the end parts of the protection portions are connected to grid lines of the main body net barrel to form a whole, and the barbs form a thrombus capturing, anti-falling and anti-escaping structure. The novel thrombus removal device has high thrombus capture capability, and more importantly, the distal protection design is novel and effective.

Description

technical field [0001] The invention belongs to the field of medical devices, in particular to a mechanical thrombectomy device for the treatment of acute ischemic stroke. Background technique [0002] Stroke is divided into hemorrhagic stroke (also known as cerebral hemorrhage) and ischemic stroke (also known as cerebral infarction), of which ischemic stroke accounts for 80%. Taking China as an example, the population of stroke has exceeded 70 million, the number of new strokes is about 2.5 million every year, and the number of stroke deaths is about 1.65 million every year, and it is showing a younger trend, which constitutes a heavy social and economic burden. [0003] At present, intravenous thrombolysis with tPA is an effective method for the treatment of acute ischemic stroke, but the treatment time window is narrow, only 4.5 hours. As a result, patients who exceed the time window cannot be treated in time. At present, the rate of thrombolytic therapy with tPA drugs i...

AI Technical Summary

Problems solved by technology

[0006] There is a problem with several mechanical thrombectomy devices commonly used in the market: the thrombectomy device does not have a distal protection design or the distal protection design is improper. When a small thrombus falls off and escapes, it is easy to cause secondary embolism.

The end protection design of the traditional thrombectomy device is divided into the following types: (1) The end design is just a few wires tied together, which is not dense enough to capture the dislodged thrombus, such as Figure 2A (2) A membrane is used at the end as a tool to capture thrombus. The disadvantages are a) if it is made of metal material, it is not easy to press; b) the membrane is often sewn on, easy to detach, and the manufacturing process is more complicated ,like Figure 2B ; (3) It can be designed as an externally embedded positive spine structure, such as Figure 2C , but this design thrombus can still fall out

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