Zimmer ATS 3000 Automatic Tourniquet System….. The A.T.S. 3000 is a dual-port, dual-cuff medical tourniquet system with microprocessor controls and dedicated ports for supplying and measuring pressure independently. With the innovative Limb Occlusion Pressure (LOP) feature, the A.T.S. 3000 combines the latest in advanced surgical tourniquet technology with the well-established Zimmer tradition of safety, reliability, and convenience.