Dual Chamber Syringe With Retractable Needle
First Claim
Patent Images
1. 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, wherein the trigger element includes a proximal end, a free and open distal end that provides the trigger force, and a trigger element body extending from the proximal end to the distal end and including an interior surface defining a hollow interior, the trigger element providing a trigger force causing the needle cannula to retract into the retraction barrel.
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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.
13 Citations
35 Claims
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1. A syringe assembly comprising:
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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, wherein the trigger element includes a proximal end, a free and open distal end that provides the trigger force, and a trigger element body extending from the proximal end to the distal end and including an interior surface defining a hollow interior, the trigger element providing a trigger force causing the needle cannula to retract into the retraction barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A syringe assembly comprising:
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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 divided by a barrier wall having a first aperture permitting fluid communication between the fluid chamber and the needle chamber; 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 by a frangible connection, 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 rod disposed within the needle chamber, the retraction rod including a proximal end and an open distal end for breaking the frangible connection of the needle hub assembly upon application of a distally directed force to the retraction rod and causing the needle cannula to retract and be retracted within the retraction rod. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification