A separator that uses centrifugation to fractionate a suspension such as blood comprises a separation container and a buoy. The buoy is carried in the separation container and has a tuned density that is configured to reach an equilibrium position in a suspension. The guide surface is carried on the...http://www.google.fr/patents/US7806276?utm_source=gb-gplus-shareBrevet US7806276 - Buoy suspension fractionation system
