Biological state estimation device

Patent metadata

Field	Value
Publication number	US-2024188874-A1
Application number	US-202418582237-A
Country	US
Kind code	A1
Filing date	Feb 20, 2024
Priority date	Sep 1, 2021
Publication date	Jun 13, 2024
Grant date	—

Abstract

A biological state estimation device that estimates a biological state based on at least an electrocardiographic feature amount and comprises an electrocardiographic waveform acquisition unit; an electrocardiographic feature amount extraction unit, a pulse waveform acquisition unit; a pulse wave feature amount extraction unit an electrocardiographic waveform quality determination unit; a first search reference point setting unit for setting a first reference point for searching the electrocardiographic waveform when the electrocardiographic waveform is of quality to enable extraction of the electrocardiographic feature amount; and a second search reference point setting unit that sets a second reference point for searching the electrocardiographic waveform on the basis of the pulse wave feature amount when the electrocardiographic waveform is of quality to enable extraction of the electrocardiographic feature amount. The electrocardiographic feature amount extraction unit searches the electrocardiographic waveform based on the first reference point or the second reference point an.

First claim

1 . A biological state estimation device which comprises:
an electrocardiographic waveform acquisition unit which acquires an electrocardiographic waveform; an electrocardiographic feature amount extraction unit which searches the electrocardiographic waveform and extracts a feature amount of the electrocardiographic waveform; a pulse waveform acquisition unit which acquires a pulse waveform; and a pulse wave feature amount extraction unit which searches the pulse waveform and extracts a feature amount of the pulse waveform, and which estimates a biological state on a basis of at least the feature amount of the electrocardiographic waveform among the feature amount of the electrocardiographic waveform and the feature amount of the pulse waveform, the biological state estimation device further comprising: an electrocardiographic waveform quality determination unit which determines whether or not the electrocardiographic waveform has a quality of being able to extract the feature amount of the electrocardiographic waveform from only the electrocardiographic waveform; a first search reference point setting unit which sets a first reference point for searching the electrocardiographic waveform in a case where it is determined that the electrocardiographic waveform has the quality of being able to extract the feature amount of the electrocardiographic waveform; and a second search reference point setting unit which sets a second reference point for searching the electrocardiographic waveform on a basis of the feature amount of the pulse waveform in a case where it is determined that the electrocardiographic waveform does not have the quality of being able to extract the feature amount of the electrocardiographic waveform, wherein the electrocardiographic feature amount extraction unit searches the electrocardiographic waveform on a basis of the first reference point or the second reference point and extracts for each beat the feature amount of the electrocardiographic waveform.

2 . The biological state estimation device according to claim 1 , further comprising a pulse waveform quality determination unit which determines whether or not the pulse waveform has a quality of being able to extract the feature amount of the pulse waveform, wherein in a case where it is determined that the pulse waveform has the quality of being able to extract the feature amount of the pulse waveform, the pulse wave feature amount extraction unit extracts the feature amount of the pulse waveform.

3 . The biological state estimation device according to claim 1 , wherein
the pulse wave feature amount extraction unit extracts a rise of the pulse waveform, and the second search reference point setting unit sets a rising time of the pulse waveform as the second reference point.

4 . The biological state estimation device according to claim 1 , wherein
the pulse wave feature amount extraction unit extracts a peak of the pulse waveform, and the second search reference point setting unit sets a time of the peak of the pulse waveform as the second reference point.

5 . The biological state estimation device according to claim 1 , wherein
the pulse wave feature amount extraction unit extracts a peak in a first differential waveform calculated from the pulse waveform, and the second search reference point setting unit sets, as the second reference point, a time of the peak in the first differential waveform calculated from the pulse waveform.

6 . The biological state estimation device according to claim 1 , wherein
the pulse wave feature amount extraction unit extracts a peak in a second differential waveform calculated from the pulse waveform, and the second search reference point setting unit sets, as the second reference point, a time of the peak in the second differential waveform calculated from the pulse waveform.

7 . The biological state estimation device according to claim 1 , wherein a blood pressure value is estimated as the biological state.

8 . The biological state estimation device according to claim 1 , wherein a heart rate is estimated as the biological state.

Assignees

• Omron Healthcare Co Ltd

Inventors

• Ito Akito
• Fujii Kenji
• Kawabata Yasuhiro
• Matsumura Naomi
• Sakaguchi Yuki

Classifications

• A61B5/021

  Measuring pressure in heart or blood vessels · CPC title

• A61B5/7221

  Determining signal validity, reliability or quality (preventing, reducing or removing noise induced by motion artefacts A61B5/7207; noise originating from a therapeutic or surgical apparatus A61B5/7217) · CPC title

• A61B5/0245

  by using sensing means generating electric signals, {i.e. ECG signals} · CPC title

• A61B5/256

  Wearable electrodes, e.g. having straps or bands · CPC title

• A61B5/349 Primary

  Detecting specific parameters of the electrocardiograph cycle · CPC title