Positive displacement flush syringe
AssigneeBecton, Dickinson and Company
InventorAnthony Kosinski
Life of this patent
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Abstract
A flush syringe assembly comprises a barrel including a cylindrical side wall having an inside surface defining a chamber for retaining fluid, an open proximal end and a distal end including an elongate tip extending distally therefrom having a passageway in fluid communication with the chamber. A plunger including an elongate body portion has a stopper at its distal end. The stopper is slidably positioned in fluid-tight engagement with the inside surface of the barrel for driving fluid out of the chamber. The distal end of the stopper is configured to collapse while fluid is being driven though the passageway through motion of a plunger and to continue to drive fluid through the passageway after motion of the plunger has stopped.
Claims32
A flush syringe assembly comprising:
- a barrel including a cylindrical 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;
- a plunger including an elongate body portion having a proximal end and a distal end, a stopper slidably positioned in fluid-tight engagement with said inside surface of said barrel for 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
- means for moving additional fluid distally in said passageway at the completion of the flush procedure after distal motion of said plunger with respect to said barrel has stopped.
The syringe assembly of claim 9 wherein said additional fluid is delivered in a time of 0.5 second or more when said syringe is connected to a peripheral catheter.
An I.V. flush syringe assembly comprising:
- a barrel including a cylindrical 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;
- a tip cap releasably connected to said tip for sealing said passageway;
- a plunger including an elongate body portion having a proximal end and a distal end, a resilient stopper, a quantity of flush solution in said chamber, said stopper slidably positioned in fluid-tight engagement with said inside surface of said barrel for 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
- structure for moving additional flush solution distally in said passageway after flush solution has been delivered from said chamber and distal motion of said plunger with respect to said barrel has stopped, including said stopper having a distal end including a distal wall and a cavity therein defining an inside surface and a proximal end, said distal wall being flexible enough to collapse at least partially, into said cavity under the liquid pressure and to move back toward its original shape at the completion of the flush procedure to force additional flush solution of at least 0.001 ml into said passageway when said syringe is connected to a peripheral catheter.
Dependencies are inferred from the claim text.