Effect of New High Ankle Block on Wound Healing After the Operation of Debridement of Diabetes Foot

The goal of this clinical trial is to compare high ankle block and general anesthesia on wound recovery and ankle blood flow perfusion after diabetes foot surgery in diabetics. The main questions it aims to answer are: * weather the high ankle block can fast wound recovery after the surgery * weather the high ankle block can improve ankle blood flow perfusion after the surgery Participants will receive either high ankle block or general anesthesia during surgery. After the operation, foot ulcer area and pulse perfusion index will be measured on the postoperative day of 1 and 14; lower limb hemodynamic parameters will be measured by ultrasound on the postoperative days of 1, 7, and 14. Researchers will compare high ankle block and general anesthesia to see if they have the different on the wound recovery and blood flow perfusion of the patients' foot.