SINGLE USE SYRINGE

摘要

A syringe intended for use only once and then disposed. The syringe comprises a barrel (11) and a plunger (15) slidably and sealingly mounted in the barrel. A control means (17) provided on the plunger co-operates with the barrel to permit movement of the plunger along the barrel in one direction while resisting movement in the reverse direction thereby to present further use. More particularly, the control means (17) includes a portion (45) which is arranged to brush against the barrel upon movement of the plunger in one direction to permit such movement and which is arranged to bite against said barrel upon attemptive movement of the plunger in the reverse direction thereby to resist such movement.