RETRACTABLE SYRINGE WITH REDUCED RETRACTION FORCE

摘要

A tamperproof retractable non-reusable syringe has a one piece hollow outer body (12) with a barrel (14) for a slidable plunger, a transition zone and a smaller diameter nose portion (16). An elongated needle holder (22) and spri ng (24) combination is installable from the rear of the outer body, guided into the nose portion and held by cooperating inwardly and outwardly facing surfaces oriented in the direction of retraction at the most constricted par t of the transition zone where the nose begins.