A flexible piston rod for use in cylinder ampoules comprises a tape shaped body (1) which is along its length provided with supporters (2; 6; 16) projecting from at least one side of the tape. The tape (1) has a width and the supporters a length so that sides of the tape and the free ends of the supporters...http://www.google.de/patents/US6302869?utm_source=gb-gplus-sharePatent US6302869 - Syringe having a flexible piston rod
