PROBLEM TO BE SOLVED: To provide a blood pressure measuring apparatus and method which can prevent the worsening of S/N ratio attributed to pulse wave components generated at a cuff upstream part in the measurement of systolic blood pressures and also achieves a smaller size by eliminating a buffer tank for smaller size using an acoustic impedance device provided in a bypass passage.SOLUTION: The blood pressure measuring apparatus has a blood pressure cuff body 1 made up of a cuff member 2, an air bag 8 for blocking blood which presses a blood pressure measuring site as a whole, a sub air bag 9 for pressing the side of the heart and an air bag 10 for detecting pulse waves which presses the side of the arterial periphery and pressure adjustors 26 and 27 to be connected respectively through the first and second piping 6 and 7. The bypass passage 18 is provided with the acoustic impedance device 22 containing the first and second acoustic resistances and an acoustic innertance and an acoustic compliance.COPYRIGHT: (C)2008,JPO&INPIT【課題】 収縮期血圧測定時のS/N比がカフ上流部に発生する脈波成分により悪化することを防止でき、かつパイパス流路に設けられる音響インピーダンス装置により、大きなバッファタンクが不要となり小型化が図れる血圧測定装置および血圧測定方法の提供。【解決手段】 カフ部材2と、血圧測定部位の全体を圧迫する阻血用空気袋8と、心臓側を圧迫するサブ空気袋9と、動脈抹消側を圧迫する脈波検出用空気袋10とから構成されるカフ本体1と、第1配管6、第2配管7を介して接続される加減圧装置26、27を備えた血圧測定装置であって、バイパス流路18に第1音響抵抗と第2音響抵抗と音響イナータンスと音響コンプライアンスとを含む音響インピーダンス装置22を設ける。【選択図】図1
