JP2010220690A5 - - Google Patents

Claims (7)

A light-emitting element that irradiates light to the human body; and a light-receiving element that detects the amount of received light. A pulse wave detector that detects a wave and converts the pulse wave into an electrical signal;
A feature point calculation unit that calculates a feature point of the pulse wave based on the waveform of the electrical signal converted by the pulse wave detection unit;
A feature point period calculation unit that calculates a period of the feature points calculated by the feature point calculation unit;
A propagation time calculation unit that calculates the propagation time of the pulse wave based on the period calculated by the feature point period calculation unit;
A blood pressure value estimating unit configured to estimate the blood pressure value of the human body based on the propagation time calculated by the propagation time calculating unit and the respiration of the human body estimated from the fluctuation of the propagation time. A blood pressure measurement device.   The blood pressure value measuring apparatus according to claim 1, wherein the feature point calculation unit calculates the feature point based on an n-order differential waveform obtained by performing n-order differentiation (n is a natural number) of the pulse wave.   The blood pressure value measuring device according to claim 1 or 2, wherein the feature point calculation unit calculates each feature point based on a pulse wave detected from one pulse wave measurement point of the human body. The pulse wave detection unit includes a pulse rate counting unit that counts the pulse rate of the pulse wave,
4. The blood pressure value according to claim 1, wherein the blood pressure value estimating unit estimates a blood pressure value by correcting a propagation time of the pulse wave based on the pulse rate counted by the pulse rate counting unit. measuring device. A reference value storage unit for storing a cuff measurement blood pressure value of the human body measured using a cuff as a reference value of the blood pressure value;
The reference value of the blood pressure value stored in the reference value storage unit is compared with the blood pressure value estimated by the blood pressure value estimation unit, and the difference between the reference value of the blood pressure value and the estimated blood pressure value is If it is more than a predetermined value, according to claim 1-4, wherein the divergence has a blood pressure value correcting unit for correcting a blood pressure value estimated by the blood pressure estimating portion so as to be smaller than the predetermined value The blood pressure measurement device according to any one of the above. A plurality of the pulse wave detectors attached to different parts of the human body;
The feature point calculation unit, the feature point period calculation unit, the propagation time calculation unit, and the blood pressure value estimation unit are characterized by a feature point of the pulse wave for each pulse wave detected by the plurality of pulse wave detection units, The blood pressure value measuring apparatus according to any one of claims 1 to 5 , wherein a period of the feature point, a propagation time of the pulse wave, and a blood pressure value of the human body are respectively calculated or estimated. A blood pressure measurement method performed by a blood pressure measurement device,
A light-emitting element that irradiates light to the human body; and a light-receiving element that detects the amount of received light. Detecting a wave and converting the pulse wave into an electric signal;
A feature point calculating step for calculating a feature point of the pulse wave based on the waveform of the electrical signal converted by the pulse wave detecting step;
A feature point period calculating step for calculating a period of the feature point calculated by the feature point calculating step;
A propagation time calculating step for calculating a propagation time of the pulse wave based on the period calculated by the feature point period calculating step;
A blood pressure value estimating step of estimating the blood pressure value of the human body based on the propagation time calculated by the propagation time calculating step and the respiration of the human body estimated from the fluctuation of the propagation time. A blood pressure measurement method.