| 摘要 |
PURPOSE: To secure safety for handling, pollution or the like during injection by a method wherein a protruded part and a recessed part are formed each on slide contact surfaces of a movable member and a immovable member, the protruded parts of the movable member and the immovable member are fitted into a communication path facing them in the closing of the communication path and the protruded parts are fitted into the recessed parts facing them in the opening of the communication path. CONSTITUTION: An injector 1 comprises an outer cylinder 2 having an injection port 2A and a plunger 3 to be fitted into the outer cylinder 2. A communication path 8 is formed in a plug body 5 for communication between the inside of a filling chamber 6 of an injection liquid and the injection port 2A while the plug body 5 is made up of a movable member 5A rotatable through an operation hole and an immovable member 5B non-rotatable and the communication path 8 is opened or closed by turning the movable member 5A. A protruded part 10 and a recessed part 11 are formed each on slide contact surfaces of the movable member 5A and the immovable member 5B. The protruded member parts 10 of the movable member 5A and the immovable member 5B are fitted into the communication path 8 facing them in the closing of the communication path 8 and the protruded parts 10 of the movable member 5A and the immovable member 5B are fitted into the recessed parts 11 facing them in the opening of the communication path 8.
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