Patent ID: 9452268
Filing Date: 2016-09-27
CPC Classification: A61M

Claim Text:
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.