Thrombus taking device

Abstract

The invention belongs to the field of interventional medical instruments, and particularly relates to a thrombus taking device for taking thrombus out of a blood vessel. The thrombus taking device comprises an elongate delivery member and a plurality of thrombus taking members disposed on the elongate delivery member, wherein the thrombus taking member has a compressed configuration and an expanded configuration formed by self-expansion from the compressed configuration, and at least one of the multiple thrombus taking members is rotatably connected with the elongate delivery member. Accordingto the thrombus taking device, the thrombus taking member has the rotating freedom degree, so that thrombus can enter the thrombus taking member easily through the thrombus inlet, and the thrombus taking member can be fully expanded and make full contact with the thrombus so as to achieve the effective capture of the thrombus.

Description

technical field [0001] The invention belongs to the field of interventional medical devices, and in particular relates to a thrombus removal device for removing thrombus in a blood vessel. Background technique [0002] Stroke is a common disease in medicine. China is a major stroke country in the world, and stroke has become the number one cause of death among Chinese residents. According to relevant epidemiological studies, 3 out of every 4 stroke patients suffer from different degrees of disability. Acute ischemic stroke (AIS, commonly known as cerebral infarction) is the damage of nerve tissue caused by ischemic necrosis of local brain tissue caused by sudden blockage of blood flow in the brain. Acute ischemic stroke is the most common type of stroke and the main cause of death and disability in middle-aged and elderly people. Vascular recanalization is the key to the treatment of acute ischemic stroke. At present, the conventional methods for the treatment of acute i...

AI Technical Summary

Problems solved by technology

[0005] 1. The grid of the thrombectomy stent is the passage for the thrombus to enter its interior, so the size of the grid determines the effect of the thrombus retrieval stent on capturing the thrombus. Usually, the integral thrombectomy stent has the largest grid size when it is fully expanded. The thrombus retrieval stent is always in a compressed state in the blood vessel, which makes the grid of the thrombus retrieval scaffold not in an optimal size, especially when catching white blood clots / hard thrombi rich in white blood cells (the thrombus is rich in fibers and has strong viscoelasticity). , studies have shown that the force required to compress leukocyte-rich white thrombus / hard thrombus is 9mN / mm 2 ), the radial force of the self-expanding stent is not enough to allow the mesh rods of the stent to penetrate into the white thrombus, and the mesh size of the thrombectomy stent cannot allow the white thrombus to enter the thrombus retrieval stent from the mesh

[0006] 2. The local deformation of the thrombectomy stent will cause the grid associated with this part to deform simultaneously, which will cause the overall diameter of the thrombectomy stent to become smaller when the thrombectomy stent passes through the curved vessel part during the retraction process, thereby separating from the blood vessel , causing the thrombus to dislodge from the stent

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