Prefilled syringe with a limited-withdrawal plunger rod

A prefilled syringe comprising:

• a barrel having a closed front-end wall with a small passageway through which injection liquid is discharged and a rear opening;
• a plunger including a sliding plug liquid tightly contacting with the inner surface of the barrel and partitioning the inside of the barrel into a liquid-filled area which is formed between said plunger and said closed front-end wall and in which the injection liquid is filled and sealed, and a liquid-unfilled area in the back of the liquid-filled area and a plunger rod extending backward from said sliding plug through said rear opening of the barrel;
• and
• a plunger withdrawal-limiting member in the form of a flange fixed to the rear opening of said barrel and extending inwardly in the radial direction from the periphery of the rear opening of said barrel, which limits plunger withdrawal by engaging said plunger,
• wherein, said plunger withdrawal-limiting member has an opening sized to allow said plunger rod to pass therethrough, and said plunger rod has a stopper member extending outwardly in the radial direction from the plunger rod, withdrawal of said plunger being limited by contact of said stopper member with said plunger withdrawal-limiting member.