A syringe for a power injector has an adapter with engaging and gripping means for being secured to the machine grippable protrusion of a backer plate of the piston of the syringe. The rear end of the adapter has a machine grippable protrusion so that the syringe, having its volume reduced by the length...http://www.google.es/patents/US4636198?utm_source=gb-gplus-sharePatente US4636198 - Power syringe with volume reducing adapter
