PROBLEM TO BE SOLVED: To provide a needle assisted jet injection device in which the occurrence of accidental firing due to stored energy associated with a trigger mechanism is reduced.SOLUTION: An injector 100 comprises: a trigger mechanism including a trigger member 300 disposed about an axis and having an aperture 302 and a protrusion, and a ram assembly 122 further having a trigger engagement member configured to engage the aperture of the trigger member when the trigger member is in a pre-firing condition； an energy source 120 associated with a ram 1232 for powering the ram to expel the medicament； and a firing-initiation member having an aperture engaged with the protrusion of the trigger member and operable for causing an axial translation of the trigger member in a proximal direction from the pre-firing condition to a firing condition in which the trigger engagement member is released from a retaining portion to allow the energy source to fire the ram.SELECTED DRAWING: Figure 1【課題】トリガおよび蓄積されたエネルギーによる偶発的な発射の発生を低減した針支援式ジェット注射器を提供する。【解決手段】注射器１００は、軸の周りに配置され開口３０２および突起部を有するトリガ部材３００と、トリガ部材が発射前状態にあるときにトリガ部材の開口に係合するように構成されたトリガ係合部材をさらに有するラム組立体１２２を含むトリガ機構と、薬剤を発射するためにラム１２３２に力を加えるようにラムに関連付けられるエネルギー源１２０と、トリガ部材の突起部に係合される開口を有し、発射前状態から発射状態へ近位方向にトリガ部材の軸方向移動を引き起こすように操作可能であり、発射状態ではトリガ係合部材が保持部から解放されることでエネルギー源がラムを始動することが可能になる発射開始部材とを含む。【選択図】図１
