Patent ID: 7682345
Filing Date: 2010-03-23
Classification: A61M

Abstract:
1. A plunger for a syringe for use with a medical injector system, the syringe having a barrel and a hub slidingly engaging the barrel, the plunger comprising: an outer surface; an actuating member disposed at least partially within a longitudinal bore defined in the inside of the outer surface; a channel extending in a radial direction; and at least one retention member slideably disposed within the channel to retractably protrude from at least an inner surface to at least above the outer surface, wherein the at least one retention member terminates with an inwardly projection end formed as a curved contacting surface, wherein the retention member is adapted to releasably engage a substantially annular engaging portion on an inner surface of the hub upon retraction of the plunger to permit the hub to be selectively withdrawn along the barrel by the plunger.