Supplementary video 1. Thrombolysis video. First, the thrombi filled along the vein were removed by venotomy. With an external venous drainage, 100,000 IU urokinase mixed with 100 mL normal sa-line was continuously infused into the arterial pedicle with a butterfly needle. Simultaneously, the venous flow was discharged outside the blood vessel through the resected end to prevent urokinase infusion into systemic circulation. After the vein was sufficiently drained, urokinase infusion was stopped, and venous drainage was continued for 15 minutes at the venotomy. Fresh bleeding is seen through the venotomy site.