A multi-lumen tube arrangement for use in a centrifuge free of a sliding seal, the tube arrangement having at least two individual tubes which are rotated around one another around their longitudinal and/or their parallel axes. The rotation of the tubes takes place in this connection in opposite directions...http://www.google.com.au/patents/US6832981?utm_source=gb-gplus-sharePatent US6832981 - Tube arrangement and a method for its manufacture
