| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact and portable drug solution injection device in a simple structure capable of being manufactured at a low cost, by which a stable discharge pressure is obtained. SOLUTION: A drug solution chamber 10 whose one end is tightly closed, for which a lid part 60 having the injection and flow-out port of a drug solution is fixed to the other end is internally fitted and disposed, the lid part is projectingly provided on a bottom wall part 40 provided on one end of a cylinder 30 and a piston 50 freely slidably and airtightly moving in the axial direction of the cylinder is internally fitted and disposed. The drug solution chamber is internally fitted to the cylinder so as to be held between the bottom wall part 40 and the piston. When the lid part is fixed to the bottom wall part, the part between the drug solution chamber and the cylinder is turned to an airtight space F. When the drug solution is filled in the drug solution chamber and the airtight space F is vacuumed, the piston is energized by the atmospheric pressure and pressurizes the drug solution chamber trying to return in a bottom wall part direction. When the flow-out port of the lid part is opened, the drug solution inside the drug solution chamber is discharged by the pressurization. |
