Pulse wave analyzer and blood pressure estimator using the same

摘要

In a pulse wave analyzer, an ECG signal and a pulse wave signal are detected from an object to be analyzed. A plurality of feature points are extracting from the acquired ECG signal, the feature points appearing in a waveform of the ECG signal. The acquired pulse wave signal is segmented into a plurality of pulse wave signal pieces based on times at which the feature points appear. Each of the pulse wave signal pieces is segmented every heart beat. A reference pulse wave is calculated based on the plurality of pulse wave signal pieces, by multiplying the pulse wave signal pieces by coefficients and averaging the pulse wave signal pieces multiplied by the coefficients. The reference pulse wave is used to estimate the blood pressure of the object.

主权项

1. A pulse wave analyzer comprising:
signal acquiring means for acquiring an ECG signal and a pulse wave signal which are detected from an object to be analyzed; feature point extracting means for extracting a plurality of feature points from the acquired ECG signal, the feature points appearing in a waveform of the acquired ECG signal; signal segmenting means for segmenting the acquired pulse wave signal into a plurality of pulse wave signal pieces based on times at which the plurality of feature points appear, each of the pulse wave signal pieces being segmented every heart beat; calculating means for calculating, for estimation of a blood pressure of the object, a reference pulse wave based on the plurality of pulse wave signal pieces, by multiplying the plurality of pulse wave signal pieces by coefficients and averaging the plurality of pulse wave signal pieces multiplied by the coefficients, wherein the calculation of the reference pulse wave is performed repeatedly at intervals with a part of the plurality of pulse wave signal pieces interchanged with another new pulse wave signal piece; and coefficient setting means for setting the coefficients based on a coefficient of correction between the new pulse wave signal piece and the reference pulse wave calculated immediately before the interchange such that the larger the coefficient of correlation, the larger a contribution of the pulse wave signal pieces to the reference pulse wave.