| 摘要 |
PROBLEM TO BE SOLVED: To avoid occurrence of an accident in which an injection needle pierces, for example, a hand of a patient due to any operational error during an accommodating operation.SOLUTION: A sleeve 10 is externally fitted to an injection cylinder 2 movably in an axial direction from an administration position at which an injection needle 5 protrudes toward a tip side to an accommodating position at which the injection needle 5 is accommodated. A coil spring 16, which urges the sleeve 10 toward the accommodating position, is arranged between the sleeve 10 and the injection cylinder 2. The coil spring 16 is retained beforehand in a compression state by the spring holder 17. The spring holder 17 is linked beforehand to the injection cylinder 2 so that the coil spring is released by further forcibly inserting the injection cylinder 2 toward the tip side after completion of administration of a liquid medicine. Further, the sleeve 10 and the injection cylinder 2 are engaged in the axial direction so that locking occurs at the accommodating position when the sleeve 10 is moved to the accommodating position by means of an urging force of the coil spring 16. |
