Patent ID: 7981088

Claim:
A syringe system for administering lyophilized drugs, the syringe system comprising a syringe barrel comprising a proximal end and a distal end, the proximal end configured to receive a plunger and a stopper; a stopper coupled with the syringe barrel; a plunger being configured to be removably coupled with the stopper and including a proximal cap covering a radial element of the plunger that is configured to allow transition of the plunger from an extended, reconstitution length to a shortened, administration length, the plunger comprising a stem and being movable from a proximal position towards a distal position; and a needle guard coupled with the syringe barrel, the needle guard comprising a body being configured to receive the syringe barrel, a shield slidable between a retracted position and an extended position, and latch members coupled to the body or the shield, wherein the shield transitions from the retracted position to the extended position when the radial element of the plunger contacts the latch members; wherein the proximal cap of the plunger does not contact the latch members when the plunger is in the extended, reconstitution length.