BigPatents India

A single use syringe assembly is provided as well as a locking element for such an assembly. The single use syringe assembly includes a barrel , a plunger rod assembly and a locking element positioned within the barrel . The locking element includes one or more barbs for engaging the inside surface of the barrel . The barbs prevent the locking element from moving proximally within the barrel , but allow its distal movement therein with the plunger rod assembly . A spring member may be provided for urging the barbs towards the inside surface of the barrel . The barbs are preferably positioned on the edge portions of opposing legs that form part of the locking element.