Flush syringe having anti-reflux features
AssigneeBecton, Dickinson and Company
InventorsThomas A. Alheidt, Tracy Ray Hottovy, Dustin Drake
Life of this patent
Estimating the term…
Abstract
An I.V. flush syringe assembly includes a barrel having an inside surface defining a chamber for retaining fluid, an open proximal end and a distal end with a passageway therethrough in fluid communication with the chamber. An elongate plunger having a proximal end, a distal end and a flexible stopper is slidably positioned in fluid-tight engagement with the inside surface of the barrel for drawing fluid into and out of the chamber by movement of the stopper relative to the barrel. The barrel includes anti-reflux structure for holding said stopper in a partially deflected position after fluid has been delivered from the chamber and the stopper is being force against the distal end of the chamber.
Claims9
An I.V. flush syringe assembly comprising:
- a barrel having an inside surface defining a chamber for retaining 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, said inside surface having distal annular recess at the distal end;
- a plunger including an elongate body portion having a proximal end, a distal end and a flexible stopper 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 stopper including a distal annular rib, a middle annular rib and a proximal annular rib wherein said distal annular rib is configured to be received within said annular recess at said distal end of said barrel via a friction fit or an interference fit upon completion of a flush procedure, thereby holding said stopper in compressed form and preventing withdrawal of said stopper in a proximal direction.
Dependencies are inferred from the claim text.