SYRINGE

摘要

A syringe (1B) comprises: a syringe body (1C) including a plunger (32) to be operated for injection of a drug solution; a cylindrical needle cover (11B) housing an injection needle (100A); and a spring (18) held in a compressed state by the needle cover (11B). The needle cover (11B) has seats (153A) and (155B) in a pair that abut on corresponding opposite ends of the spring (18) to restrict the position of the spring (18). Pushing in the plunger (32) further after injection deforms the seat (155A) to release restriction on the spring (18). The spring (18) free from the restriction abuts on the syringe body (1C). This biases the needle cover (11B) to move the needle cover (11B) to a position where the injection needle (100A) is housed.

主权项

1. A syringe, comprising:
a syringe body including an injection needle, a solution chamber storing a drug solution, and an operational part to be operated in a certain direction to inject the drug solution stored in the solution chamber from the injection needle; a cylindrical needle cover housing the injection needle; and an elastic member held by the needle cover while being compressed in an axial direction of the injection needle, wherein the needle cover has seats in a pair to restrict the positions of both end portions of the elastic member in the axial direction by making abutting contact with the both end portions of the elastic member, the elastic member being held in a gap between the seats in a pair, a seat being one of the seats in a pair is deformed in response to operation on the operational part in the certain direction performed after injection to release restriction on the position of one end portion of the elastic member, and the one end portion of the elastic member is to abut on the syringe body side in response to the deformation of the seat to bias the needle cover, thereby moving the needle cover to a position where the injection needle is housed.