Syringe Assembly Having a Rotatably Advanceable Plunger Rod

A plunger rod assembly comprising a plunger rod for use with a syringe assembly, the plunger rod comprising:

• an inner member having a distal end configured for securement to a stopper disposed within a syringe barrel;
• an outer member having an open portion configured for rotational advancement with respect to the inner member to axially displace the outer member with respect to the inner member, wherein the plunger rod is transitionable from a collapsed position in which a portion of the inner member is nested within the outer member, to an extended position in which the same portion of the inner member extends outside the outer member;
• and
• a restraint configured to limit axial advancement of the outer member with respect to the inner member in the extended position.

A syringe assembly, comprising:

• a syringe barrel having a first end, a second end, and a sidewall extending therebetween defiling a chamber;
• a stopper slideably disposed at least partially within the chamber;
• and
• a plunger rod comprising:
• an inner member engaged with a portion of the stopper and comprising a radial extension;
• and
• an outer member defining a track adapted to receive the radial extension therein,
• wherein rotation of the outer member about the inner member axially displaces the track about the radial extension to transition the plunger rod from a collapsed position in which a portion of the inner member is nested within the outer member, to an extended position in which the same portion of the inner member extends outside the outer member.