PROBLEM TO BE SOLVED: To provide a portable blood pressure value measuring apparatus that allows a user to measure the blood pressure value at any time easily.SOLUTION: A first pulse wave detecting section 101A1 is attached to the earlobe e of a human body and detects pulse waves of the human body at the earlobe e using an infrared ray. A first pulse wave interval calculating section 102B1 calculates, as shown in Fig.4-1, the maximum point of the pulse waves fluctuating periodically. In addition, one cycle of the pulse waves corresponding to one beat, namely the pulse wave interval, is calculated by using two adjacent feature points As. A pulse wave first differential calculating section 103 calculates a first differential waveform by subjecting the original waveform of the pulse waves outputted by the first pulse wave interval calculating section 102B1 to first differential processing. A feature point calculating section 104 calculates the maximum point (feature point B) and the minimum point (feature point C) of the first differential waveform of the pulse wave fluctuating periodically. The time difference between the feature point B and the feature point A is the propagation time &Deltat, namely the propagation time of the pulse waves &Deltat [msec]. A blood pressure value estimating section 109 estimates the blood pressure value on the basis of regressive correlation between the propagation time &Deltat and the blood pressure value x [mmHg].COPYRIGHT: (C)2011,JPO&INPIT【課題】血圧値測定装置に可搬性を持たせ、いつ何時でも気軽に血圧値を測定することが出来る様にする。【解決手段】第1脈波検出部101A1は、人体の耳朶eに取り付けられ、耳朶eにおける人体の脈波を赤外線を用いて検出する。第1脈波間隔算出部102B1は、図4-1に示す様に、周期的に変動する脈波の最大点を算出する。また、隣り合う二つの特徴点Aから脈波の一拍分の周期、すなわち脈波間隔を算出する。脈波一次微分算出部103は、第1脈波間隔算出部102B1が出力した脈波の元波形を一次微分して一次微分波形を算出する。特徴点算出部104は、周期的に変動する脈波の一次微分波形の最大点(特徴点B)及び最小点(特徴点C)を算出する。特徴点B及び特徴点Aの時間差が伝搬時間Δtである。血圧値推定部109は、脈波の伝播時間Δt[msec]として、伝播時間Δtと血圧値x[mmHg]との回帰的相関関係に基づき血圧値を推定する。【選択図】図1
