Syringe Having a Spring Action Plunger Rod

A syringe assembly comprising:

• a syringe barrel having a first end, a second end, and a sidewall extending between the first end and the second end defining a chamber;
• a stopper disposed within the chamber of the syringe barrel;
• a plunger rod associated with the stopper, the plunger rod comprising:
• an outer sleeve having a distal end interconnected to the stopper, the outer sleeve comprising a sidewall portion defining an opening therein;
• an inner sleeve disposed within the outer sleeve, the inner sleeve including a longitudinally extending track, at least a portion of the track being in alignment with the opening in the outer sleeve, wherein the inner sleeve is adapted for telescopic movement with respect to the outer sleeve;
• and
• a spring mounted in association with the inner sleeve;
• and
• a holding mechanism associated with the plunger rod and configured for cooperation with the inner and outer sleeves, wherein relative movement between the inner sleeve and the outer sleeve causes the plunger rod to transition from a collapsed pre-use position to an extended ready-to-use position.