A flexible, disposable centrifuge bag for receiving and holding a fluid sample, comprising one or more tubes and upper and lower flexible sheets having doughnut shaped configurations. The upper and lower sheets are superimposed and completely sealed together at their outer perimeters to define an outer...http://www.google.ca/patents/US7306741?utm_source=gb-gplus-sharePatent US7306741 - Flexible centrifuge bag and methods of use
