| 摘要 |
A cartridge-type syringe in which a cartridge, having liquid medicine or the like sealed therein, is inserted in a holder having a discharge needle at its distal end, and the cartridge is advanced to cause the discharge needle to pierce it, thereby injecting the liquid medicine or the like into an object, and when a piston rod of the cartridge is pushed to cause the discharge needle to pierce, the liquid medicine or the like will not be discharged in error in a large amount. In particular, there is provided a releasable lock mechanism by which when a piston rod 15 is pushed, the piston rod 15 advances together with a tubular body 11 of a cartridge 10 without moving a piston 14 within the tubular body 11. For example, in a first embodiment, when a discharge needle 5 pierces the distal end of the tubular body 11, an engagement member 24 is pressed to be brought into intimate contact with the piston rod 15, thereby releasing the lock mechanism 21, and by pushing the piston rod 15, the piston 14 is driven to advance within the tubular body 11, thereby discharging liquid medicine or the like via the discharge needle 5.
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