Patent ID: 8043267

Claim:
A prefilled syringe filled with a drug comprising: a hollow cylinder having a nozzle coupled to an opening of the cylinder at a first end and configured to be fitted with an injection needle, and a guard-shaped extension proximate to the nozzle and axially projecting from a shoulder section of the cylinder; a plunger having a plunger rod and a gasket fixedly coupled to a first end of the plunger rod, the plunger arranged to freely move backwards and forwards within the opening of the cylinder at a second end, the plunger rod including a disc-shaped flange at a second end of the plunger rod with the disc-shaped flange having at least one air through-hole; a barrier package that covers the peripheral surface of the cylinder between the first end thereof proximate to the guard-shaped extension and the second end thereof proximate to the opening; a cap fitted onto an end of the nozzle; a filter member that is permeable to moisture, the filter member being arranged adjacent to an outside surface of the disc-shaped flange of the plunger so as to cover the air through-hole; and a shrink film that covers the outer peripheral surface of the barrier package, the cap fitted onto the nozzle and the plunger with the filter member being at least partially exposed such that moisture enclosed in a space formed between the shrink film and an outer surface of the plunger rod is released outside of the shrink film through the air through-hole and the filter member, the shrink film including a pull-tag arranged to be pulled to tear the shrink film.