| 摘要 |
PROBLEM TO BE SOLVED: To provide a needleless injector that facilitates its shorter-time charging with chemical by small force and eliminates infection via fewer skin injuries. SOLUTION: The disposable needleless injector comprises an inner unit 8 consisting of a cylinder for chemical storage which is mountable driving unit 10 for driving with high pressure a piston 5 that is fitted in the cylinder and which has at its forward end an injection opening 7, and an outer unit 3 consisting of an outer cylinder which is fixable in a fitted state on the inner unit 8 and which has at its forward end a minimal-diameter nozzle 1 connecting to and smaller in diameter than the injection opening 7 at the forward cylinder end of the inner unit 8. A chemical 4 to fill the injector is introduced in it via the injection opening 7 of the inner unit 8 while the outer unit 3 is removed away.
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