| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to easily and properly discharging a gas in a drug space of an injector from the drug space.SOLUTION: An injector 10 includes: a syringe 30 which has a cylindrical portion extending in a predetermined direction, enables an injection needle to be attached to one end of the predetermined direction, and has an opening formed in the other end; a piston 40 which can be accommodated inside the cylindrical body 30a of the syringe 30, and can slide in a predetermined direction inside the cylindrical body 30a; and a plunger rod which is attached on the other end side of the piston 40, and allows the piston 40 to slide. The piston 40 has a gas-liquid separating film 64 for allowing a gas in the drug space S to pass and a liquid in the drug space S not to pass at a position communicating with the drug space S on the one end side of the piston 40. |
