Biological state eliminating apparatus and method
First Claim
1. A biological state estimating apparatus comprising:
- a pair of non-invasive electrocardiographic electrodes configured to detect an electrocardiogram signal of a user without implanting the electrocardiographic electrodes in the user;
a non-invasive photoplethysmographic sensor configured to detect a photoplethysmogram signal, the non-invasive photoplethysmographic sensor having a light-emitting element and a light-receiving element;
electronic memory storing a plurality of sleep state correlation information that indicates a relationship between pulse transmission times and a state of sleep and that is predetermined based on a relationship between pulse transmission times before sleep, pulse transmission times after sleep, and a state of sleep; and
a controller configured to;
detect a peak of the electrocardiogram signal,detect a peak of the photoplethysmogram signal,calculate a pulse transmission time based on a time difference between the respective peaks of the photoplethysmogram signal and the electrocardiogram signal, andestimate a state of sleep of the user based on a calculated pulse transmission time before sleep of the user, a calculated pulse transmission time after sleep of the user, and the plurality of sleep state correlation information stored in the electronic memory.
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Accused Products
Abstract
A biological state estimating apparatus includes a pair of electrocardiographic electrodes, a photoplethysmographic sensor, and a controller that includes a peak detecting section, a pulse transmission time measuring section, a correlation information storing section, and a biological state estimating section. The electrocardiographic electrodes detect an electrocardiogram signal and the photoplethysmographic sensor, which has light-emitting and light-receiving elements, detects a photoplethysmogram signal. The controller detects peaks of the electrocardiogram and photoplethysmogram signals and determines a pulse transmission time from the time difference between the respective peaks of the photoplethysmogram and the electrocardiogram signal. Memory stores information determined in advance based on the relationship between pulse transmission time and biological state. The controller further estimates the biological state of the user on the basis of the pulse transmission time, and the correlation information stored in the correlation information storing section.
10 Citations
15 Claims
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1. A biological state estimating apparatus comprising:
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a pair of non-invasive electrocardiographic electrodes configured to detect an electrocardiogram signal of a user without implanting the electrocardiographic electrodes in the user; a non-invasive photoplethysmographic sensor configured to detect a photoplethysmogram signal, the non-invasive photoplethysmographic sensor having a light-emitting element and a light-receiving element; electronic memory storing a plurality of sleep state correlation information that indicates a relationship between pulse transmission times and a state of sleep and that is predetermined based on a relationship between pulse transmission times before sleep, pulse transmission times after sleep, and a state of sleep; and a controller configured to; detect a peak of the electrocardiogram signal, detect a peak of the photoplethysmogram signal, calculate a pulse transmission time based on a time difference between the respective peaks of the photoplethysmogram signal and the electrocardiogram signal, and estimate a state of sleep of the user based on a calculated pulse transmission time before sleep of the user, a calculated pulse transmission time after sleep of the user, and the plurality of sleep state correlation information stored in the electronic memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A biological state estimating apparatus comprising:
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a pair of non-invasive electrocardiographic electrodes configured to detect an electrocardiogram signal of a user without implanting the electrocardiographic electrodes in the user; a non-invasive photoplethysmographic sensor configured to detect a photoplethysmogram signal, the non-invasive photoplethysmographic sensor having a light-emitting element and a light-receiving element; electronic memory storing a plurality of sleep state correlation information that indicates a relationship between pulse transmission times and a state of sleep and that is predetermined based on a relationship between a variation of pulse transmission times during sleep and a state of sleep; and a controller configured to; detect a peak of the electrocardiogram signal, detect a peak of the photoplethysmogram signal, calculate a pulse transmission time based on a time difference between the respective peaks of the photoplethysmogram signal and the electrocardiogram signal, and estimate a state of sleep of the user based on a variation of the calculated pulse transmission time during sleep of the user and the sleep state correlation information stored in the electronic memory.
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11. A method for estimating a biological state of a user, the method comprising:
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detecting an electrocardiogram signal of the user by a pair of non-invasive electrocardiographic electrodes without implanting the electrocardiographic electrodes in the user; detecting a photoplethysmogram signal of the user by a non-invasive photoplethysmographic sensor having a light-emitting element and a light-receiving element; storing, by electronic memory, a plurality of sleep state correlation information that indicates a relationship between pulse transmission times and a state of sleep and that is predetermined based on a relationship between pulse transmission times before sleep, pulse transmission times after sleep, and a state of sleep; detecting a peak of the electrocardiogram signal; detecting a peak of the photoplethysmogram signal; calculating a pulse transmission time based on a time difference between the respective peaks of the photoplethysmogram signal and the electrocardiogram signal; storing, by the electronic memory, the calculated pulse transmission time; and estimating a state of sleep of the user based on a calculated pulse transmission time before sleep of the user, a calculated pulse transmission time after sleep of the user, and the plurality of sleep state correlation information stored in the electronic memory. - View Dependent Claims (12, 13, 14, 15)
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Specification