PROBLEM TO BE SOLVED: To set an appropriate control gain in a feedback control irrespective to attributes of a person to be measured in non-invasive measurement of a blood pressure per heartbeat according to a volume compensation method.SOLUTION: A direct current component of an arterial volume signal obtained at the maximum amplitude at which the amplitude of an artery volume varied signal indicating a varied component of an artery volume signal using a pulse wave is brought to the maximum by varying a cuff pressure is determined as a control target value for the artery volume (S4). Then, a feedback control is made to control the cuff pressure so that the arterial volume signal matches the control target value (S6). A cross correlation function between the artery volume varied signal obtained in a period including the maximum amplitude point and a cuff pressure signal that is under adjustment of a control gain of the feedback control is calculated (S7). A control gain obtained when the cross correlation function becomes equal to or higher than a threshold is determined as an optimum control gain (S10).COPYRIGHT: (C)2014,JPO&INPIT【課題】容積補償法により非観血的に1心拍ごとの血圧測定を行う場合に、被測定者の属性によらず、フィードバック制御の制御ゲインを適切に設定すること。【解決手段】カフの圧力を変化させて、動脈容積信号の脈波による変化成分を表す動脈容積変化信号の振幅が最大になった振幅最大時点の動脈容積信号の直流成分を、動脈容積についての制御目標値として決定する(S4)。その後、フィードバック制御を行って、動脈容積信号が制御目標値と一致するように、カフの圧力を制御する(S6)。振幅最大時点を含む期間の動脈容積変化信号と、フィードバック制御の制御ゲイン調整中のカフ圧信号との間の相互相関関数を算出する(S7)。相互相関関数が閾値以上になった時点の制御ゲインを、最適な制御ゲインとして決定する(S10)。【選択図】図2
