Wearable LED Sensor Device Configured to Identify a Wearer's Pulse
First Claim
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1. A wearable sensor device comprising:
- a housing configured to allow the wearable sensor device to be worn on a portion of the body; and
a circuit comprising;
a first LED secured to the housing in a manner that causes the first LED to face the portion of the body when the wearable sensor device is worn;
a light sensor secured to the housing, the light sensor being positioned to receive light that is transmitted from the first LED and reflected from or transmitted through the portion of the body, the light sensor being configured to generate a photoplethysmogram (“
PPG”
) representing the amount of light that is received by the light sensor over time;
a processing unit configured to receive the PPG and to process the PPG, the processing of the PPG including;
identifying peaks in the PPG;
identifying valleys in the PPG;
using the valleys to generate a base of the PPG; and
subtracting the base from the PPG to yield beat data; and
a storage for storing the beat data.
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Abstract
A wearable sensor device can include at least one LED and a light sensor for generating a photoplethysmogram (“PPG”) from light emitted by the at least one LED. The wearable sensor device can also include a processing unit that is configured to process the PPG to produce a highly reliable representation of the wearer'"'"'s pulse.
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Citations
24 Claims
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1. A wearable sensor device comprising:
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a housing configured to allow the wearable sensor device to be worn on a portion of the body; and a circuit comprising; a first LED secured to the housing in a manner that causes the first LED to face the portion of the body when the wearable sensor device is worn; a light sensor secured to the housing, the light sensor being positioned to receive light that is transmitted from the first LED and reflected from or transmitted through the portion of the body, the light sensor being configured to generate a photoplethysmogram (“
PPG”
) representing the amount of light that is received by the light sensor over time;a processing unit configured to receive the PPG and to process the PPG, the processing of the PPG including; identifying peaks in the PPG; identifying valleys in the PPG; using the valleys to generate a base of the PPG; and subtracting the base from the PPG to yield beat data; and a storage for storing the beat data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method, performed by a wearable sensor device that includes an LED and a light sensor that generates a photoplethysmogram (“
- PPG”
) from light emitted from the LED, for generating beat data from the PPG, the method comprising;receiving the PPG at a processing unit of the wearable sensor device; identifying peaks in the PPG; identifying valleys in the PPG; using the valleys to generate a base of the PPG; subtracting the base from the PPG to yield the beat data; and storing the beat data in a storage of the wearable sensor device. - View Dependent Claims (19, 20, 21, 22, 23)
- PPG”
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24. A method for acquiring heartbeat information to perform differential diagnosis of heart disease;
- comprising;
attaching a wearable sensing device to a user, the sensing device having an LED and a light sensor; generating a photoplethysmogram (PPG) from light emitted from the LED; and deriving beat data from the PPG to perform differential diagnosis of heart disease by distinguishing between conditions such as hypertrophy, cardiomyopathy, aortic stenosis, hypertension, arrhythmia and low perfusion and to derive left ventricle ejection time.
- comprising;
Specification