A positive displacement flush syringe includes a barrel (21) having a chamber (25) for retaining fluid and an elongate tip (31) extending distally therefrom having a passageway (32) therethrough in fluid communication with the chamber. A plunger (37) having a stopper (41) which is slidably positioned in said chamber for driving fluid out of the chamber by movement of the stopper relative to the barrel is provided. Further, a structure is provided to move fluid distally in the passageway after fluid has been delivered from the chamber and the stopper is in contact with the distal wall of the chamber.
