Foot pump+lower limbs pump Orthropaedic branch of Chinese medical association enrolled intermittent pneumatic compression system for preventing DVT into VTE prevention guideline Applications: 1) Deep vein thrombosis prophylaxis Except pediatric department, all the long-term bed and perioperative period patients are applicable. 2)Treatment for limbs edema caused by different reasons, like: Upper or lower limbs lymphedema caused by breast cancer operation or trauma; Venous return disfunction like varicosity, venous valve incompetence, etc.; Traumatic or acute limbs edema; Long-term chronic edema, refractory ankle edema, etc.