PROBLEM TO BE SOLVED: To improve blood pressure measurement accuracy regarding a blood pressure meter used for measuring biological information such as blood pressure.SOLUTION: A blood pressure meter includes a cuff to be wound around an upper arm of a subject, a pressure sensor for measuring the cuff pressure including a pulse wave component, and a CPU for acquiring data of the cuff pressure. When removing the vascular obstruction on the outside of the upper arm in the width direction when the cuff is wound around, the pressure sensor gradually expands the measurable range of the cuff pressure including the pulse wave component while it quickly expands the measurable range when removing the vascular obstruction on the inside of the upper arm in the width direction when the cuff is wound around. When removing the vascular compression on the outside of the upper arm, the pressure sensor measures the cuff pressure, on which the pulse wave component is superposed, with higher intensity in the partial range compared with the remaining range while it measures the cuff pressure, on which the pulse wave component is superposed, with uniform intensity over the whole range when removing the vascular compression on the inside of the upper arm. The CPU determines the blood pressure on the basis of the cuff pressure indicated in data measured and acquired when the shape of a specific time phase for every pulse-wave period is deformed.COPYRIGHT: (C)2013,JPO&INPIT【課題】血圧計測精度を向上させること。【解決手段】血圧計は、被検者に巻回可能なカフ、脈波成分を含むカフ圧を測定する圧力センサ、及びカフ圧のデータを取得するCPUを有する。圧力センサは、前記カフの巻回時の幅方向において外側部での血管閉塞を解消するときは、脈波成分を含むカフ圧の測定可能範囲を漸次拡大し、前記カフの巻回時の幅方向において内側部での血管閉塞を解消するときは、前記測定可能範囲を急拡大する。また圧力センサは、前記外側部での血管圧迫を解消するときは、一部の範囲では残りの範囲に比べて高強度で脈波成分が重畳されたカフ圧を測定し、前記内側部での血管圧迫を解消するときは、全範囲にわたって均一強度で脈波成分が重畳されたカフ圧を測定する。CPUは、脈波周期毎の特定時相の形状が変形した時に測定され、取得したデータに示されたカフ圧に基づいて、血圧を判定する。【選択図】図4
