Dual chamber passive retraction needle syringe
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 such that the fluid chamber and the needle chamber are in fluid communication and a needle hub assembly comprising a needle hub, a needle cannula attached to the needle hub in fluid communication with the aperture, the needle hub assembly biased to move in the proximal direction; and
a trigger element moveable with the plunger rod and extending into the needle chamber of the retraction barrel, 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. In one or more embodiments, the assemblies include a fluid barrel for retaining fluid and a retraction barrel for housing the retraction feature and the needle hub assembly. The assemblies include a trigger element that moves with the plunger rod to activate the retraction feature within the retraction mechanism.
81 Citations
32 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 such that the fluid chamber and the needle chamber are in fluid communication and a needle hub assembly comprising a needle hub, a needle cannula attached to the needle hub in fluid communication with the aperture, the needle hub assembly biased to move in the proximal direction; and a trigger element moveable with the plunger rod and extending into the needle chamber of the retraction barrel, 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)
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22. 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 divided by a barrier wall having a first aperture permitting fluid communication between the fluid chamber and the needle chamber, the needle chamber including a flexible tab that extends into the needle chamber to engage a needle hub assembly disposed therein;
a needle hub assembly disposed within the needle chamber, the needle hub assembly comprising a needle hub, a needle cannula attached to the needle hub in fluid communication with the first aperture, the needle cannula biased to move in the proximal direction, the flexible tab positioned to engage the needle hub and apply a force in the distal direction to the needle hub so that the needle cannula extends beyond the open distal end of the retraction barrel in a first position; and
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, a plunger rod body extending from the distal end to the proximal end, and an activation element disposed on the plunger rod to move the flexible tab and cause the needle cannula to retract and be housed within the retraction barrel in a second position. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
- 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, the needle chamber including a flexible tab that extends into the needle chamber to engage a needle hub assembly disposed therein;
Specification