PROBLEM TO BE SOLVED: To provide a hemadynamometer which reduces variation of a pressurizing force which can occur while driving a hemadynamometer using a piezoelectric pump, and also, which can pressurize at a constant flow rate even when there is individual variation in the piezoelectric pump.SOLUTION: A hemadynamometer 10 has: a piezoelectric pump 25 for pressurizing a cuff 50 a frequency generation part 31 for generating a drive frequency of the piezoelectric pump 25 a drive circuit 26 for driving the piezoelectric pump 25 at a drive frequency generated by the frequency generation part 31 a pressure sensor 23 for detecting the pressure inside the cuff 50 pressurized by the piezoelectric pump 25 and a blood pressure value measurement part 34 for measuring a blood pressure value of a person to be measured based on detection data by the pressure sensor 23. The frequency generation part 31 makes the drive frequency temporally change in a repeated manner in a whole prescribed frequency range in which a resonance frequency of the piezoelectric pump 25 fluctuates.COPYRIGHT: (C)2014,JPO&INPIT【課題】圧電ポンプを用いた血圧計の駆動中に生じ得る加圧力の変動を低減させ、また、圧電ポンプに個体ばらつきがあっても一定流速で加圧可能な血圧計を提供する。【解決手段】血圧計10は、カフ50を加圧する圧電ポンプ25と、圧電ポンプ25の駆動周波数を生成する周波数生成部31と、周波数生成部31により生成された駆動周波数で圧電ポンプ25を駆動する駆動回路26と、圧電ポンプ25により加圧されるカフ50内の圧力を検出する圧力センサ23と、圧力センサ23による検出データに基づいて被測定者の血圧値を測定する血圧値測定部34と、を有する。周波数生成部31は、圧電ポンプ25の共振周波数が変動する所定周波数範囲全体で、駆動周波数を繰り返し時間変化させる。【選択図】図2
