US 6,599,269 B1Granted

Single-use syringe

AssigneeBecton, Dickinson and Company

InventorsRaymond D. Lewandowski, Karin Gunther, Marcos Calucho Villas

Life of this patent

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Abstract

A syringe assembly includes a barrel having a chamber for retaining fluid. The barrel has an open proximal end, a distal end and an elongated tip extending from the distal end having a passageway therethrough in fluid communication with the chamber. The tip has a diameter at its distal end of less than about 3.8 mm and a side wall tapered proximally outwardly at a taper of from 4% to 8%. A plunger rod includes an elongated body portion having a proximal end, a distal end and a stopper at the distal end. The stopper is slidably positioned in fluid-tight engagement in the barrel. An elongated projection extending distally from the distal end of the plunger rod is shaped to fit within the passageway of the elongated tip. Structure is provided for preventing proximal motion of the plunger rod with respect to the barrel after distal motion of the stopper to expel fluid through the passageway.

Claims28

Dependent claims

An operable syringe assembly comprising:

a barrel having an inside surface describing a chamber for retaining fluid, an open proximal end, a distal end, and an elongated tip extending from said distal end having a passageway therethrough in fluid communication with said chamber, said tip having a diameter at its distal end of less than 3.8 mm and a side wall tapered proximally outwardly at a taper of from 4% to 8%;
a plunger rod including an elongated body portion having a proximal end, a distal end, and a stopper at said distal end, said stopper being slidably positioned in fluid-tight engagement in said barrel, an elongated projection extending distally outwardly from said distal end of said plunger rod, said elongated projection being shaped to fit within said passageway of said elongated tip, said body portion extending outwardly from said open proximal end of said barrel;
and
a locking element positioned in said barrel between said elongate body portion of said plunger rod and said inside surface of said barrel, said element having a proximal portion and a distal portion, said locking element including a proximally and outwardly facing locking barb, a distally and inwardly facing resisting edge and an inwardly facing driving edge at said proximal portion of said element, said driving edge adapted to interact with said body portion of said plunger rod to move said locking element along said barrel as said stopper is advanced along said barrel, said resisting edge and said barb adapted to prevent proximal motion of said plunger rod with respect to said barrel after initial distal motion of said stopper to expel fluid through said passageway wherein subsequent proximal motion of said plunger rod with respect to said barrel causes said resisting edge to engage said plunger rod causing said locking element to move in a proximal direction wherein said locking barb engages said inside surface of said barrel to prevent further movement and allowing only distal movement of said plunger rod with respect to said barrel.

1 more element

An operable syringe assembly comprising:

a barrel having an inside surface describing a chamber for retaining fluid, said barrel having an open proximal end and a distal end, and an elongated tip extending from said distal end having a passageway therethrough in fluid communication with said chamber, said tip having a diameter at its distal end of less than about 3.8 mm and a side wall tapered proximally outwardly at a taper of from 4% to 8%;
a plunger rod including an elongated body portion having a proximal end, a distal end, and a stopper at said distal end, said stopper being slidably positioned in fluid-tight engagement in said barrel, an elongated projection extending distally outwardly from said distal end of said plunger rod, said elongated projection being shaped to fit within said passageway of said elongated tip, said body portion extending outwardly from said open proximal end of said barrel;
means for preventing proximal motion of said plunger rod with respect to said barrel after distal motion of said stopper to expel fluid through said passageway;
and
a needle assembly including a cannula having a proximal end, a distal end and a lumen therethrough, a hub having an open proximal end with a tapered cavity therein, said tapered cavity having a side wall tapered distally inwardly at a taper of from 4% to 8% said cavity having a diameter of less than about 3.85 mm at said open proximal end, said hub including a distal end joined to said proximal end of said cannula so that said lumen is in fluid communication with said cavity, said needle assembly being connected to said barrel so that said elongated tip of said barrel engages said tapered cavity of said hub.

2 more elements

An operable syringe assembly comprising:

a barrel having an inside surface describing a chamber for retaining fluid, said barrel having an open proximal end and a distal end, and an elongated tip extending from said distal end having a passageway therethrough in fluid communication with said chamber, said tip having a side wall tapered proximally outwardly at a taper of about 6%;
a plunger rod including an elongated body portion having a proximal end, a distal end, and a stopper at said distal end, said stopper being slidably positioned in fluid-tight engagement in said barrel, an elongated projection extending distally outwardly from said distal end of said plunger rod, said elongated projection being shaped to fit within said passageway of said elongated tip, said body portion extending outwardly from said open proximal end of said barrel;
means for preventing proximal motion of said plunger rod with respect to said barrel after distal motion of said stopper to expel fluid through said passageway;
a needle assembly including a cannula having a proximal end, a distal end, and a lumen therethrough, a hub having an open proximal end with a tapered cavity therein including a side wall tapered distally inwardly at a taper of about 6% said cavity having a diameter of less than about 3.85 mm at said open proximal end, said hub including a distal end joined to said proximal end of said cannula so that said lumen is in fluid communication with said cavity and a needle shield removably connected to said hub so that said distal end of said cannula is in said needle shield;
and
a package enclosing said syringe assembly and said needle assembly.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/631,362Filed 2 Aug 2000
Granted: 29 Jul 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

A61M 5/3134
Syringe barrels: characterised by constructional features of the distal end, i.e. end closest to the tip of the needle cannula
A61M 5/5013
Having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile: means for blocking the piston or the fluid…
A61M 5/346
Constructions for connecting the needle , e.g. to syringe nozzle or needle hub: friction fit
A61M 5/502
Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe: for blocking the piston