The invention contemplates a non-invasive technique and apparatus for artificially stimulating the venous-return flow of blood from the foot by inducing fast-rising pulsed squeezing or necking-down of the vessels of the venous-pump mechanism within the foot. The stimulation results from transient flattening...http://www.google.co.uk/patents/US4696289?utm_source=gb-gplus-sharePatent US4696289 - Method of promoting venous pump action
