Patent ID: 8226616

Claim:
An I.V. flush syringe assembly comprising: a syringe barrel having an elongated body defining a chamber for retaining fluid, an open proximal end, a distal end and a frusto-conically shaped tip extending from said distal end having a tip passageway therethrough in fluid communication with said chamber, said chamber having an inside diameter of at least 13.5 mm (0.53 inch), said chamber having a distal end defined by a distal wall through which said passageway passes, the length of said chamber being no more than 57 mm (2.25 inches); a stopper in fluid-tight engagement inside said barrel; an elongated rigid plunger rod defining a longitudinal axis and extending proximally from said stopper through said open proximal end of said barrel, a flange at a proximal end of said plunger rod; a tip cap releasably connected to said tip for sealing said passageway; and flush solution in said chamber, wherein the fluid pressure in the flush solution injected through said passageway when force is applied to the plunger rod is about one-third of the fluid pressure in a flush solution injected through a passageway of a 3 ml syringe barrel having an inside diameter of about 8.6 mm when the same force is applied to the plunger rod.