BIOLOGICAL INFORMATION MEASURING APPARATUS

PROBLEM TO BE SOLVED: To suitably perform air exhaustion of a cuff with a simple structure and with easy control.SOLUTION: A cuff 10 configured in an expandable and contractable manner includes a pump 212 for performing air supply, a first pressure sensor 204 for measuring cuff pressure in the cuff 10, and a constant discharge valve 208 and a rapid discharge valve 210 for reducing cuff pressure by performing air exhaustion of the cuff 10. A control part 214 performs air exhaustion of the cuff 10 expanded by the pump 212 at a constant flow rate per unit time to reduce cuff pressure by performing control for adjusting the opening of the constant discharge valve 208 while opening the rapid discharge valve 210. 【課題】簡易な構造で、且つ、容易な制御でカフの排気を好適に行うこと。【解決手段】膨縮可能に構成されたカフ１０に給気するポンプ２１２と、カフ１０内のカフ圧を測定する第１圧力センサ２０４と、カフ１０の排気を行うことによりカフ圧を減小する定排弁２０８及び急排弁２１０と、を有する。制御部２１４は、急排弁２１０を開きつつ、定排弁２０８の開度を調整する制御を行うことにより、ポンプ２１２により膨張させたカフ１０の排気を単位時間当たり一定の流量で行ってカフ圧を減小する。【選択図】図６