SYRINGE HAVING TAMPER EVIDENCE FEATURES

摘要

A syringe having tamper evidence features includes a barrel (21) having a chamber (22) for retaining fluid, an open proximal end (23), and a distal end (25) having a passageway (27) therethrough in fluid communication with the chamber (22). A needle shield (32) having a longitudinal axis (33), a distal end (34) and an open proximal end (35) slidably engages the distal end of the barrel covering the passageway. The shield (32) includes an outwardly projecting shield lug (37) having a cam surface (38). A collar (40) having an annular side wall (41), an open proximal end (43) and a distal end (44) having an aperture (45) therethrough, is adjacent to the distal end of the barrel with the needle shield projecting distally through the aperture. The aperture is sized so that the proximal end of the needle shield cannot pass therethrough. The collar includes an inwardly projecting lug (46) having a follower surface (47) for contacting the cam surface (38). The cam surface and the follower surface being configured so that rotational force applied to the needle shield around the longitudinal axis causes the cam surface to contact the follower surface to apply a force to the follower surface. Securement means (49) is provided for releasably holding the collar adjacent to the barrel. The securement means is positioned so that the force applied to the follower surface can disengage the securement means allowing the collar to move and allowing the needle shield to be removed from the barrel.