An elongated rectangular cuff having electrodes combined with a motion detector for detecting muscle contraction with an attached control unit for providing a predetermined electrical signal to the electrodes. The predetermined electrical signal is substantially a square wave with a duration of between...http://www.google.com/patents/US6282448?utm_source=gb-gplus-sharePatent US6282448 - Self applied and self adjusting device and method for prevention of deep vein thrombosis with movement detection
