Dual chamber syringe with retractable needle
First Claim
Patent Images
1. A syringe assembly comprising:
- a barrel comprising including an open proximal end, a 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 of the fluid chamber to the proximal end of the fluid chamber, wherein the inside surface of the sidewall includes a retaining ring adjacent to the proximal end defining a second cross-sectional width that is less than the first cross-sectional width and the plunger rod body includes a flexible protrusion having a cross-sectional width greater than the cross-sectional width of the barrel at the rib and a frangible portion; and
a trigger element disposed within the needle chamber, the trigger element 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 trigger element and causing the needle cannula to retract and be retracted within 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.
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Citations
10 Claims
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1. A syringe assembly comprising:
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a barrel comprising including an open proximal end, a 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 of the fluid chamber to the proximal end of the fluid chamber, wherein the inside surface of the sidewall includes a retaining ring adjacent to the proximal end defining a second cross-sectional width that is less than the first cross-sectional width and the plunger rod body includes a flexible protrusion having a cross-sectional width greater than the cross-sectional width of the barrel at the rib and a frangible portion; and a trigger element disposed within the needle chamber, the trigger element 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 trigger element and causing the needle cannula to retract and be retracted within the retraction barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification