PROBLEM TO BE SOLVED: To provide a medical liquid administration device capable of accurately detecting an amount of medical liquid stored in a medical liquid storage part.SOLUTION: A medical liquid administration device 1 includes a medical liquid storage part 13, a plunger member 18, a capacity measuring part 31, and an arithmetic part. The capacity measuring part 31 includes a plurality of electrodes 31a and 31b disposed, with their facing an external wall of the medical liquid storage part 13. The capacity measuring part 31 measures an electrostatic capacity between the plurality of electrodes 31a and 31b. The arithmetic part calculates an amount of the medical liquid filling the medical liquid storage part 13 from the electrostatic capacity measured by the capacity measuring part 31.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】薬液貯蔵部に貯蔵された薬液の量を正確に検出することができる薬液投与装置を提供する。【解決手段】薬液投与装置1は、薬液貯蔵部13と、押し子部材18と、容量測定部31と、演算部と、を備えている。容量測定部31は、薬液貯蔵部13の外壁と対向して配置された複数の電極31a、31bを有している。そして、容量測定部31は、複数の電極31a、31bの間の静電容量を測定する。演算部は、容量測定部31が測定した静電容量から薬液貯蔵部13に充填された薬液の量を演算する。【選択図】図1
