An apparatus for the continuous flow fractionation of whole blood incorporates motor driven whole blood, anti-coagulant and replacement pumps, negative and positive pressure monitors, and a dual bubble detector which function in conjunction with a disposable single-use flow system and a hollow fiber...http://www.google.de/patents/US4501531?utm_source=gb-gplus-sharePatent US4501531 - Control circuit for a blood fractionation apparatus
