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US 2012/0071827 A1Published application
Dual Chamber Syringe With Retractable Needle
AssigneeBecton, Dickinson and Company
InventorsIvan Zivkovic, Christopher A. Battles, James Gleason, Jeffrey Radziunas
Life of this patent
Estimating the term…
Abstract
Embodiments of a retractable syringe assembly are provided that include a dual syringe barrel configuration. One or more embodiments include reuse prevention features and features that prevent premature activation of the retraction mechanism. Methods for aspirating and expelling liquid from medical devices are also provided.
Claims27
A syringe assembly comprising:
- a fluid barrel including a sidewall having an inside surface defining a fluid chamber for retaining fluid and having a first cross-sectional width, an open proximal end and a distal end including a distal wall;
- a plunger rod disposed within the fluid chamber comprising a distal end, a proximal end, a plunger rod body extending from the distal end to the proximal end, and a stopper disposed at the distal end of the plunger rod for forming a fluid-tight seal with the inside surface of the barrel;
- a retraction barrel disposed adjacent to the sidewall of the fluid barrel, the retraction barrel including a wall having an interior surface defining a needle chamber, an open proximal end, an open distal end including a barrier wall, an aperture between the wall of the retraction barrel and the sidewall of the fluid barrel permitting fluid communication between the fluid chamber and the needle chamber and a needle hub assembly comprising a needle hub, a needle cannula attached to the needle hub, the needle cannula being in fluid communication with the aperture and biased to move in a proximal direction;
- and
- a trigger element disposed within the needle chamber and moveable within the retraction barrel independently from the plunger rod, the trigger element providing a trigger force causing the needle cannula to retract into the retraction barrel.
2 more elements
A syringe assembly comprising:
- a fluid barrel including a sidewall having an inside surface defining a fluid chamber for retaining fluid and having a first cross-sectional width, an open proximal end and a distal end including a distal wall;
- a plunger rod disposed within the fluid chamber comprising a distal end, a proximal end, a plunger rod body extending from the distal end to the proximal end, and a stopper disposed at the distal end of the plunger rod for forming a fluid-tight seal with the inside surface of the barrel;
- a retraction barrel disposed adjacent to the sidewall of the fluid barrel, the retraction barrel including a wall having an interior surface defining a needle chamber, an open proximal end, an open distal end including a barrier wall, an aperture between the wall of the retraction barrel and the sidewall of the fluid barrel permitting fluid communication between the fluid chamber and the needle chamber and a needle hub assembly comprising a needle hub, a needle cannula attached to the needle hub, the needle cannula being in fluid communication with the aperture and biased to move in a proximal direction;
- and
- a trigger element disposed adjacent the distal end of the fluid barrel to provide a trigger force causing the needle cannula to retract into the retraction barrel.
2 more elements
A syringe assembly comprising:
- a barrel comprising including an open proximal end, sidewall having an inside surface defining a fluid chamber for retaining fluid and having a first cross-sectional width and a needle chamber for housing a needle hub assembly, the fluid chamber and the needle chamber being circumscribed by a common wall and divided into separate chambers in fluid communication;
- a needle hub assembly disposed within the needle chamber, the needle hub assembly comprising a needle hub, a needle cannula supported within the needle hub, the needle cannula in fluid communication with the first aperture and biased to move in a proximal direction;
- a plunger rod disposed within the fluid chamber comprising a distal end, a proximal end, a stopper disposed at the distal end of the plunger rod for forming a fluid-tight seal with the inside surface of the barrel and a plunger rod body extending from the distal end to the proximal end;
- and
- a retraction member disposed within the needle chamber, the retraction member including a proximal end and an open distal end to cause the needle cannula to retract and be retracted within the retraction member.
2 more elements
A syringe assembly comprising:
- a barrel comprising including an open proximal end, sidewall having an inside surface defining a fluid chamber for retaining fluid and having a first cross-sectional width and a needle chamber for housing a needle hub assembly, the fluid chamber and the needle chamber being circumscribed by a common wall and divided into separate chambers in fluid communication;
- a needle hub assembly disposed within the needle chamber, the needle hub assembly comprising a needle hub, a needle cannula, the needle cannula in fluid communication with the first aperture and biased to move in a proximal direction;
- a plunger rod disposed within the fluid chamber comprising a distal end, a proximal end, a stopper disposed at the distal end of the plunger rod for forming a fluid-tight seal with the inside surface of the barrel and a plunger rod body extending from the distal end to the proximal end;
- and
- a trigger element adjacent the distal end of the plunger rod to provide a force to cause the needle cannula to retract and be retracted within the needle chamber.
2 more elements
Dependencies are inferred from the claim text.