After successful anesthesia, the patient was placed in prone position and routinely disinfected and toweled. An “S”-shaped incision was made in the N fossa of the left lower extremity, about 10 cm long, and the skin and subcutis were incised layer by layer, and the fatty tissue in the middle of the N fossa was separated, and the N artery was found. The distal part of the N artery was dissected downward, and no pulsation was detected, and a vascular blocking tape was applied. Intraoperatively, the outer membrane of the N artery and many fibrinous adhesions were seen, resulting in compression of the N artery lumen. Heparin 40 mg was given intravenously, and an incision of about 1 cm in length was made at the distal end to remove the mixed thrombus and part of the intima under the incision, which was about 6 cm long. The Fogarty 4 and 3 embolization catheters were used to remove the embolus to the distal end, and after removing a small amount of fragmented old thrombus, the blood was returned well, and the embolus was repeatedly removed until no thrombus could be removed, and the distal end was injected with heparin saline to block the distal N artery, and then the proximal N artery was embolized After removing the mixed thrombus of about 4 cm in length and part of the intima, the proximal blood spray was strong, the proximal end was injected with heparin saline, the proximal N artery was blocked, and the N artery incision was flushed, and the incision was closed with 7-0 Prolene sutures with continuous episiotomy. The incision was observed to have no obvious bleeding, and the gauze instruments were counted correctly, and a rubber drain was placed in another poked hole to close the incision layer by layer. There was little intraoperative bleeding. The patient’s condition was stable.