PROBLEM TO BE SOLVED: To provide a medicine injector and a medicine injecting method capable of suppressing decomposition of medicine due to heat and the like, and injecting and diffusing powdery or liquid medicine with high pressure.SOLUTION: A medicine injector 1 is provided with: a container main body 11 that accommodates a water 90 a first cap 81 having a cylinder part 54 that is formed to penetrate a lid part 52 blocking an upper end opening 13 of the container main body 11 a piston 63 that air-tightly slides with respect to a slide inner peripheral wall 55 of the cylinder part 54 and defines a gap (S) with respect to an enlarged diameter inner peripheral wall 56 a compression coil spring 80 that restricts movement of the piston 63 a powdery medicine 30 stored in a storage chamber 58 a second cap 23 having a sealing part 41 sealing an upper part side opening of a cylindrical part 26 that is formed to penetrate a lid part 21 blocking a lower end opening 15 of the container main body 11 a gas generating agent 43 stored in the cylindrical part 26 and a fracture member 33 for releasing a sealed state of the sealing part 41 so as to cause the water 90 to flow into the cylindrical part 26.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2016,JPO&INPIT【課題】熱などによる薬剤の分解を抑え、粉状又は液状の薬剤を高圧で噴射拡散することができる薬剤噴射装置及び薬剤噴射方法を提供する。【解決手段】薬剤噴射装置1は、水90を収容する容器本体11と、容器本体11の上端開口部13を塞ぐ蓋部52に貫通形成されるシリンダ部54を有する第1キャップ81と、シリンダ部54の摺動内周壁55に対しては気密に摺動すると共に拡径内周壁56に対しては空隙(S)を画成するピストン63と、ピストン63の移動を規制する圧縮コイルばね80と、収容室58に収納される粉状薬剤30と、容器本体11の下端開口部15を塞ぐ蓋部21に貫通形成される筒体部26の上部側開口を封止する封止部41を有する第2キャップ23と、筒体部26に収容されるガス発生剤43と、封止部41の封止状態を解除して水90を筒体部26内に流入させるための破断部材33と、を備える。【選択図】図2
