Methods and apparatus for disinfecting and reflux prevention flush syringe assembly

A flush syringe assembly comprising:

• a barrel including a side wall having an inside surface defining a chamber for retaining fluid, an outside surface, an open proximal end, a distal end including a distal wall having a passageway therethrough in fluid communication with the chamber;
• an elongate plunger rod disposed within the barrel, the plunger rod comprising a distal end including a stopper slidably positioned in fluid-tight contact with the inside surface of the barrel for driving fluid out of the chamber by movement of the stopper relative to the barrel, wherein the stopper comprises a stopper body and a detachable stopper tip;
• a cap comprising an outer wall surrounding a Luer connection, wherein the cap comprising a passageway for fluid communication therethrough, wherein the passageway is undercut to receive and retain the stopper tip when the plunger rod is fully depressed, the cap further comprises a distal end for releasably attaching the cap to a vascular access device (VAD) and a proximal end for releasably attaching the cap to the barrel;
• a sleeve external to the barrel having a distal end and a proximal end, and an inside surface and an outside surface, wherein the sleeve slides from distal to proximal positions in relationship to the barrel;
• and
• a disinfecting system comprising a disinfectant contained in a hub wherein the disinfectant system is released upon proximal motion of the sleeve.