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US 8,574,202 B2Granted
Positive displacement flush syringe
AssigneeBecton, Dickinson and Company
InventorThomas Adam Alheidt
Life of this patent
Estimating the term…
Abstract
A positive displacement flush syringe includes a barrel having a chamber for retaining fluid and an elongate tip extending distally therefrom having a passageway therethrough in fluid communication with the chamber. A plunger having a stopper which is slidably positioned in said chamber for driving fluid out of the chamber by movement of the stopper relative to the barrel is provided. Further, structure is provided to move fluid distally in the passageway after fluid has been delivered from the chamber and the stopper is in contact with the distal wall of the chamber.
Claims20
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 an elongate tip extending distally therefrom, the elongate tip defining a passageway therethrough in fluid communication with the chamber;
- and
- a plunger including an elongate body portion extending outwardly from the open proximal end of the barrel, a proximal end, a distal end having a discontinuity and a spring disposed at the distal end;
- a resilient stopper slidably positioned in fluid-tight engagement with the inside surface of the barrel for drawing fluid into and driving fluid out of the chamber by movement of the stopper relative to the barrel;
- wherein the stopper includes a distal end having a distal surface including a distally directed projection shaped to fit in the chamber of the barrel, a first discontinuity and a second discontinuity located distally from the first discontinuity and a proximal end defining a cavity therein;
- wherein the distal end of the plunger is connected to the stopper by a complementary detent structure defining a first detent position wherein the plunger discontinuity engages the first discontinuity and a second detent position wherein the plunger discontinuity engages the second discontinuity;
- wherein the detent structure is configured so that a distally directed force applied to the plunger after fluid has been delivered from the chamber causes the spring to compress and the plunger to move distally with respect to the stopper from the first detent position to the second detent position so a distal tip on the distal end of the plunger contacts the inside surface of the stopper forcing the distally directed projection on the distal end of the stopper into the passageway of the elongate tip to move fluid distally in the passageway after fluid has been delivered from the chamber and the stopper is in contact with the distal wall.
4 more elements
An I.V. flush syringe assembly comprising:
- a barrel including a cylindrical side wall with 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, the elongate tip defining a passageway therethrough in fluid communication with the chamber;
- wherein the distal wall of the barrel defines a total included angle A;
- a plunger including an elongate body portion extending outwardly from the open proximal end of the barrel, a proximal end, a distal end having a discontinuity, a distal tip and a spring positioned between the distal tip and the distal end;
- a resilient stopper operably engaged to the plunger and slidably positioned in fluid-tight engagement with the inside surface of the barrel for drawing fluid into and driving fluid out of the chamber by movement of the stopper relative to the barrel;
- wherein the stopper includes a distal end having a distal surface including a distally directed projection shaped to fit in the chamber of the barrel, a first discontinuity and a second discontinuity located distally from the first discontinuity and a proximal end defining a cavity therein;
- wherein the distal end of the stopper defines a total included angle B;
- wherein the distal end of the plunger is connected to the stopper by a complementary detent structure defining a first detent position in which the plunger discontinuity engages the first discontinuity and a second detent position in which the plunger discontinuity engages the second discontinuity;
- wherein the detent structure is configured so that a distally directed force applied to the plunger after fluid has been delivered from the chamber causes the spring to compress and the plunger to move distally with respect to the stopper from the first detent position to the second detent position so a distal tip on the distal end of the plunger contacts the inside surface of the stopper forcing the distally directed projection on the distal end of the stopper into the passageway of the elongate tip to move fluid distally in the passageway after fluid has been delivered from the chamber and the stopper is in contact with the distal wall;
- and
- wherein the total included angle A is greater than the total included angle B.
7 more elements
Dependencies are inferred from the claim text.