| 摘要 |
<P>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. <P>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 Δt, namely the propagation time of the pulse waves Δt [msec]. A blood pressure value estimating section 109 estimates the blood pressure value on the basis of regressive correlation between the propagation time Δt and the blood pressure value x [mmHg]. <P>COPYRIGHT: (C)2011,JPO&INPIT |
