| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize and lighten an automatic injector to improve operability and decrease the quantity of consumables. SOLUTION: This automatic injector is provided with a first cylinder having a medical fluid sealed therein, a needle on the tip side of the first cylinder, a piston moving from the rear end side forward the tip side inside the first cylinder in order to eject the medical fluid in the cylinder from the needle, a coaxial second cylinder in the rear end side of the first cylinder, a partitioned second cylinder chamber inside the second cylinder, an operation rod lineally moved by the pressure of an operating fluid supplied into the second cylinder chamber to push the piston, and a fluid supplying part for supplying the operating fluid into the second cylinder chamber. The fluid supplying part and the second cylinder are provided so as to be connected each other by a fluid tube through which the operating fluid flows. |
