The Normatec recovery systems are FDA cleared devices that are safe for home use. Do not use Normatec if you have any of the following conditions: -Acute pulmonary edema -Acute thrombophlebitis -Acute congestive cardiac failure -Acute infections -Deep vein thrombosis (DVT) -Episodes of pulmonary embolism -Wounds, lesions, infection, or tumors at or near the site of application -Where increased venous and lymphatic return is undesirable -Bone fractures or dislocations at or near the site of application