Patent ID: 9636469
Date: 2017-05-02
CPC Classifications: A61M

Claim:
1. A syringe assembly comprising: a barrel comprising including an open proximal end, a distal end, a sidewall extending from the distal end and open proximal end defining a chamber having an inside surface, a dividing wall to divide the chamber to define a fluid chamber having a first cross-sectional width for retaining fluid and a needle chamber for housing a needle hub assembly, the dividing 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 attached to the needle hub in fluid communication with the first aperture, a second conduit that extends from an open end of the needle cannula to a second aperture of the needle chamber, the needle cannula biased to move in the proximal direction by a biasing element, the dividing wall including a supporting element that extends into the needle chamber to engage a needle hub and a ramped portion that extends into the fluid chamber, the supporting element applies a force in the distal direction to the needle hub so that the needle cannula extends beyond an open distal end of a 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 a projection extending radially outwardly from the plunger rod to interact with the ramped portion of the dividing wall and cause the needle cannula to retract and be housed within the needle chamber in a second position.