Patent ID: 8512298

Claim:
An I.V. flush syringe assembly comprising: a barrel having an inside surface defining a chamber for retaining flush fluid, an open proximal end and a distal end including a distal wall with an elongate tip extending distally therefrom having a passageway therethrough in fluid communication with said chamber; and a plunger including an elongate body portion having a proximal end, a distal end including a flexible base extending axially therefrom, and a stopper made from a material and supported by said flexible base and being slidably positioned in fluid-tight engagement with said inside surface of said barrel for drawing fluid into and driving fluid out of said chamber by movement of said stopper relative to said barrel, said elongate body portion extending outwardly from said open proximal end of said barrel and said flexible base being made of a material more flexible than said stopper material in response to proximally directed forces; wherein deflection of said stopper is minimized when fluid has been delivered from said chamber and said stopper is in contact with said distal wall.