PROBLEM TO BE SOLVED: To provide a new injector for single use which does not need complex operation and is easily operated.SOLUTION: The injector includes a syringe 2, a piston 4 and a plunger 5. A sleeve member 10 which has a through-path of the plunger 5 and which can be arranged in a through-hole 3 is provided. Groove parts 10c and a step part 10s are provided on the inner circumferential surface 10f1 of the sleeve member 10. On the inner circumferential surface 2c1 of the syringe 2, oblong hole parts A5 and a step part 21 are provided. Projection parts 10p provided in the sleeve member 10 engage with the oblong hole parts A5 from the inside of the syringe 2, with the result that the oblong hole parts A5 block pull-out of the sleeve member 10 with respect to the syringe 2 and guide the sleeve member 10 so as to be pushed out with respect to the syringe 2.COPYRIGHT: (C)2013,JPO&INPIT【課題】煩雑な操作を要することなく、操作の容易な使い切りを目的とした、新規の注射器を提供する。【解決手段】シリンジ2と、ピストン4と、プランジャ5とを備える注射器である。プランジャ5の貫通通路を有して貫通孔3に配置可能なスリーブ部材10を設け、スリーブ部材10の内周面10f1に溝部10cと段部10sを設ける一方、シリンジ2の内周面2c1に、突起部10pが内側から合わさってスリーブ部材10のシリンジ2に対する引き出しを阻止すると共に、シリンジ2に対してスリーブ部材10を押し出し可能に案内する長孔部A5と段部21とを設けた。【選択図】図1
