A clot retriever device that can be used in intracranial blood vessels is disclosed on the market, which includes a skeleton that can be braided from shape memory alloy wires to capture thrombus. When these thrombus retrieval devices are retrieved after capturing the thrombus, the thrombus is not firmly fixed, easily falls off, and has a complicated structure. In addition, the plaque and broken thrombus on the blood vessel wall are easy to fall off during the thrombectomy process of the current thrombectomy device, and flow to the distal blood vessel, causing new embolism. According to reports, about 70 percent of vascular interventional thrombectomy procedures have seen thrombus fragments and fragments flow to distal vessels, which increases the risk of vascular re-embolization in patients. For example, the Solitaire FR system of the American EV3 company adopts the method of capturing thrombectomy. The device is released at the lesion site through a microcatheter to trap the thrombus, and then the device and the thrombus are put into a guide catheter with a larger inner diameter and withdrawn However, according to the doctor's report, when using this device to remove the thrombus, due to the weak grasping force on the thrombus, the thrombus is very easy to fall off from the thrombus retriever during the recovery process, and needs to be captured repeatedly, which not only increases the pain of the patient, but also It prolongs the operation time and also increases the risk of distal vessel blockage. Therefore, there is a need for an improved vascular thrombectomy device, which should meet the following conditions: 1. The thrombectomy process is simple and convenient; 2. It has good flexibility, high capture rate, lowest support force, and will not damage the inner wall of the blood vessel during thrombus removal; 3. When the thrombus is recovered after capture, the thrombus is firmly fixed and not easy to fall off.
Il DredgerTM intracranial stent retriever produced by NeuroSafe, on the one hand, optimizes the structural design of the push rod to improve the flexibility, twist control, force transmission and ability to pass through tortuous lesions at the head end of the push rod, making it easier for the thrombus retriever release and recover through the embolism; on the other hand, through the design of the front-end umbrella-type basket and the design of the movable grid structure, the capture force of the thrombus can be increased, which can effectively improve the one-time capture efficiency and reduce The pain of the patient's operation can also firmly fix the thrombus, prevent the thrombus from falling off and flow to the small blood vessels at the distal end during the recovery process and cause new blockages, and reduce the incidence of complications of thrombus removal.
