A blood processing system includes a flow reversing device with at least an air sensor in the venous line located near the patient. During treatment, blood flow is reversed to cause air to infiltrate the blood lines if any disconnections or breaks in the blood line are present. One means for placing...http://www.google.de/patents/US8002727?utm_source=gb-gplus-sharePatent US8002727 - Methods and apparatus for leak detection in blood processing systems