| 摘要 |
PROBLEM TO BE SOLVED: To ensure an easy setting of a required amount by providing in preparation a chemical feeding amount control mechanism for inputting a required amount of chemical, a drive mechanism for feeding out a specified amount of chemical, a means of operating the drive mechanism, and a pen needle assembly. SOLUTION: A chemical feeding control mechanism is composed of a knob for feeding 51, a barrel for feeding 60 and a window for feeding 70. When an amount of chemical to be delivered out is set by turning the knob 51, the mechanism is moved to a basic end direction by the moving amount proportional to a required feeding amount set by the mechanism. Movement of sliding sleeve 90 and engagement of a detent 94 for a feeding claw 81 indicates a user that the mechanism is completely positioned at a preparation completion position for a proper medical feeding out of the mechanism. When the knob 51 is pressed to a distal end after the preparation of operation of a medical feed-out pen 10, the barrel 60, window 70, collet and plunger 100 move to the distal end direction to thereby feed out a required amount of chemical. |
