Patent ID: 8394068

Claim:
A flush syringe assembly comprising: a barrel including a side wall having an inside surface defining a chamber for retaining fluid, an open proximal end and a distal end including a distal wall with a tip extending distally therefrom having a passageway therethrough in fluid communication with said chamber; an elongate 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 having a distal face and a proximal end; and one or more pulsing elements disposed on at least one of the plunger rod or the inside surface of the barrel that provide increased mechanical interference between the plunger rod and barrel, the one or more pulsing elements being rotatable to create pulsatile movement or continuous and unimpeded movement of the plunger rod within the barrel.