Mechanical thrombus extraction is mainly through the arterial puncture, through the catheter into the thrombus extraction device, the embolus in the blood vessel out of the body, to achieve the purpose of dredging. Mechanical embolization is mainly for the early formation of thrombus, the distal end has not yet appeared obvious ischemia, through the removal of embolism after dredging blood vessels to improve blood circulation, to avoid causing serious tissue necrosis. In most clinical cases, after puncture through the femoral artery, an embolizer is inserted through an interventional catheter, and the corresponding embolus is removed by intravascular operation. Mechanical thrombus extraction needs to grasp the appropriate time window, preferably within 6-8 hours. Mechanical thrombolysis has certain advantages, but thrombolysis may cause vascular damage and postoperative thrombus recurrence, so after the end of thrombolysis must be anticoagulation therapy, close observation of whether accompanied by bleeding and serious vascular damage.