Syringe with disinfecting tip feature

A flush syringe assembly comprising:

• a barrel including a side wall having an inside surface defining a chamber for retaining a fluid, an open proximal end, a distal end including a distal wall with a first tip extending distally therefrom having a first passageway therethrough in fluid communication with said chamber;
• a plunger rod disposed within the barrel, the plunger rod comprising a distal portion and a proximal portion, the plunger rod further comprising a distal end including a stopper slidably positioned in fluid-tight engagement with the inside surface of the barrel for drawing the fluid into and driving the fluid out of the chamber by movement of the stopper relative to the barrel, the plunger rod extending outwardly from the open proximal end of the barrel, the stopper having a distal surface;
• and
• a reservoir collar mounted on the distal wall of the barrel and surrounding the first tip, the reservoir collar including at least one side wall having an inside surface defining a compartment containing a disinfectant or an antimicrobial agent, a plurality of threads on the inside surface of the at least one side wall of the reservoir collar for connection to a hub of a vascular access device, a sealed distal end, a proximal end adjacent the distal wall of the barrel, with disinfection of the hub of the vascular access device by the disinfectant or the antimicrobial agent, and a second tip with a second passageway therethrough which, upon interlocking of the second tip with the first tip of the barrel and connection of the second tip to the hub of the vascular access device, produces one integral passageway for fluid communication from the barrel to the vascular access device.