A sheath (24) is provided for a syringe (10) having a barrel (18) with a needle assembly (22) projecting axially from the distal end thereof. The needle assembly (22) has a hub (28) with radially projecting ears (62) for threading into a collar (42) on the barrel (18). At least one axially extending,...http://www.google.co.uk/patents/US4237882?utm_source=gb-gplus-sharePatent US4237882 - Needle sheath
