Physiological information measurement system and physiological information measurement method

Patent metadata

Field	Value
Publication number	US-2025099011-A1
Application number	US-202418890574-A
Country	US
Kind code	A1
Filing date	Sep 19, 2024
Priority date	Sep 27, 2023
Publication date	Mar 27, 2025
Grant date	—

Abstract

The physiological information measurement system includes: a detector configured to detect a candidate QRS complex from an electrocardiogram of a subject; and an estimator configured to estimate whether the candidate QRS complex is a QRS complex based on the candidate QRS complex and information on a cardiac function of the subject.

First claim

1 . A physiological information measurement system comprising:
a detector configured to detect a candidate QRS complex from an electrocardiogram of a subject; and an estimator configured to estimate whether the candidate QRS complex is a QRS complex based on the candidate QRS complex and information on a cardiac function of the subject.

2 . The physiological information measurement system according to claim 1 , further comprising:
a calculator configured to calculate a heart rate based on the waveform estimated as QRS by the estimator.

3 . The physiological information measurement system according to claim 1 , wherein
the information on the cardiac function is a pulse wave or a cardiac sound.

4 . The physiological information measurement system according to claim 1 , wherein
the estimator estimates whether the candidate QRS complex is the QRS complex based on presence and absence of information on the cardiac function corresponding to the candidate QRS complex.

5 . The physiological information measurement system according to claim 4 , wherein
the estimator determines the presence and absence of the information on the cardiac function corresponding to the candidate QRS complex based on whether information on the cardiac function is detected within a prescribed time delay range after the candidate QRS complex is detected.

6 . The physiological information measurement system according to claim 4 , wherein
the estimator uses information on the cardiac function, which is used for determining the presence and absence of the information on the cardiac function corresponding to the candidate QRS complex, that satisfies at least one of following conditions: the information is a pulse wave or a cardiac sound; an amplitude and a slope of a waveform are within prescribed ranges from past average values; an interval of the waveforms is constant; and a degree of similarity between the waveform and a template waveform or an adjacent waveform in time series is greater than or equal to a prescribed value.

7 . The physiological information measurement system according to claim 2 , wherein
the calculator calculates a heart rate by calculating an RR interval of the waveform estimated as QRS by the estimator.

8 . The physiological information measurement system according to claim 1 , wherein
the estimator estimates whether the candidate QRS complex is the QRS complex based on a probability of the candidate QRS complex being the QRS complex based on the candidate QRS complex and a probability of a pulse wave corresponding to the candidate QRS complex.

9 . A physiological information measurement method comprising:
detecting a candidate QRS complex from an electrocardiogram of a subject; and estimating whether the candidate QRS complex is a QRS complex based on the candidate QRS complex and information on a cardiac function of the subject.

10 . The physiological information measurement method according to claim 9 , further comprising:
calculating a heart rate based on the waveform estimated as QRS in the estimating.

11 . The physiological information measurement method according to claim 9 , wherein
the information on the cardiac function is a pulse wave or a cardiac sound.

12 . The physiological information measurement method according to claim 9 , wherein
in the estimating, whether the candidate QRS complex is the QRS complex is estimated based on presence and absence of information on the cardiac function corresponding to the candidate QRS complex.

13 . The physiological information measurement method according to claim 12 , wherein
in the estimating, the presence and absence of the information on the cardiac function corresponding to the candidate QRS complex is determined based on whether information on the cardiac function is detected within a prescribed time delay range after the candidate QRS complex is detected.

14 . The physiological information measurement method according to claim 12 , wherein
in the estimating, information on the cardiac function used for determining the presence and absence of the information on the cardiac function corresponding to the candidate QRS complex satisfies at least one of following conditions: the information is a pulse wave or a cardiac sound; an amplitude and a slope of a waveform are within prescribed ranges from past average values; an interval of the waveforms is constant; and a degree of similarity between the waveform and a template waveform or an adjacent waveform in time series is greater than or equal to a prescribed value.

15 . The physiological information measurement method according to claim 10 , wherein
in the calculating, a heart rate is calculated by calculating an RR interval of the waveform estimated as QRS in the estimating.

16 . The physiological information measurement method according to claim 9 , wherein
in the estimating, whether the candidate QRS complex is the QRS complex is estimated based on a probability of the candidate QRS complex being the QRS complex based on the candidate QRS complex and a probability of a pulse wave corresponding to the candidate QRS complex.

Assignees

• Nihon Kohden Corp

Inventors

• Kimura Kei
• Wada Fumiya

Classifications

• A61B7/04

  Electric stethoscopes · CPC title

• A61B5/7264

  Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems · 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

• A61B5/366 Primary

  Detecting abnormal QRS complex, e.g. widening · CPC title

• A61B5/352

  Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval · CPC title