Patent ID: 9550030
Date: 2017-01-24
CPC Classifications: A61M

Claim:
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, the plunger rod body includes a radial contacting surface, 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, a first locking element disposed adjacent to the proximal end, 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 rotatable trigger element disposed within the needle chamber and moveable within the retraction barrel independently from the plunger rod, rotatable-trigger element including a second locking element disposed at its proximal end that engages the first locking element of the retraction barrel to prevent movement of the rotatable-trigger element in a proximal direction after the needle cannula is retracted into the retraction barrel, the rotatable trigger element providing a trigger force causing the needle cannula to retract into the retraction barrel, wherein in an initial position of the trigger element, the second locking element is not engaged with the first locking element, and upon the activation of the trigger element, the first locking element engages the second locking element preventing disengagement of the first locking element from the second locking element.