Physiological data collection
First Claim
1. A portable monitoring device comprising:
- at least one light emitter to emit first light having a first wavelength in a first range of wavelengths and second light having a second wavelength in a second range of wavelengths;
at least one light detector to generate a first electrical signal based on light detected by the light detector while the light emitter emits the first light, a second electrical signal based on light detected by the light detector while the light emitter emits the second light, and a third electrical signal based on ambient light detected while the light emitter is not emitting light;
at least one ambient light cancellation circuit to generate a countering signal to counter a portion of one or both of the first and the second electrical signals associated with an ambient light component, the ambient light cancellation circuit generating the countering signal based on a value of the third electrical signal;
at least one analog to digital converter (ADC) to generate a first digital signal based on values of the first electrical signal and to generate a second digital signal based on values of the second electrical signal; and
a controller to control operation of the at least one light emitter, the at least one light detector and the ambient light cancellation circuit, the controller being further configured to determine or update a saturation of peripheral oxygen (SpO2) metric based on the first digital signal and the second digital signal.
1 Assignment
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Accused Products
Abstract
In some implementations, a device includes light emitter(s) to emit first light having a first wavelength and second light having a second wavelength. The device also includes light detector(s) to generate a first electrical signal while the light emitter emits the first light, a second electrical signal while the light emitter emits the second light, and a third electrical signal while the light emitter is not emitting light. The device also includes ambient light cancellation circuit(s) to generate a countering signal to counter a portion of one or both of the first and second electrical signals based on the third electrical signal. The device also includes analog to digital converter(s) to generate first and second digital signals based on values of the first and second electrical signals, respectively. The device further includes a controller to determine a saturation of peripheral oxygen metric based on the first and second digital signals.
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Citations
27 Claims
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1. A portable monitoring device comprising:
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at least one light emitter to emit first light having a first wavelength in a first range of wavelengths and second light having a second wavelength in a second range of wavelengths; at least one light detector to generate a first electrical signal based on light detected by the light detector while the light emitter emits the first light, a second electrical signal based on light detected by the light detector while the light emitter emits the second light, and a third electrical signal based on ambient light detected while the light emitter is not emitting light; at least one ambient light cancellation circuit to generate a countering signal to counter a portion of one or both of the first and the second electrical signals associated with an ambient light component, the ambient light cancellation circuit generating the countering signal based on a value of the third electrical signal; at least one analog to digital converter (ADC) to generate a first digital signal based on values of the first electrical signal and to generate a second digital signal based on values of the second electrical signal; and a controller to control operation of the at least one light emitter, the at least one light detector and the ambient light cancellation circuit, the controller being further configured to determine or update a saturation of peripheral oxygen (SpO2) metric based on the first digital signal and the second digital signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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emitting, by at least one light emitter, first light having a first wavelength in a first range of wavelengths; generating, by at least one light detector, a first electrical signal based on light detected by the light detector while the light emitter emits the first light; generating, by at least one ambient light cancellation circuit, a first countering signal based on a value of an electrical signal generated by the light detector while the light emitter is not emitting light; countering, using the first countering signal, a portion of the first electrical signal associated with an ambient light component; generating, by at least one analog to digital converter (ADC), a first digital signal based on values of the first electrical signal; emitting, by the at least one light emitter, second light having a second wavelength in a second range of wavelengths; generating, by the at least one light detector, a second electrical signal based on light detected by the light detector while the light emitter emits the second light; generating, by the at least one ambient light cancellation circuit, a second countering signal based on a value of an electrical signal generated by the light detector while the light emitter is not emitting light;
countering, using the second countering signal, a portion of the second electrical signal associated with an ambient light component;generating, by the at least one ADC, a second digital signal based on values of the second electrical signal; and determining or updating, by a controller, a saturation of peripheral oxygen (SpO2) metric based on the first digital signal and the second digital signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. Non-transitory storage media including processor-executable code that, when executed, is configured to:
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cause at least one light emitter to emit first light having a first wavelength in a first range of wavelengths; cause at least one light detector to generate a first electrical signal based on light detected by the light detector while the light emitter emits the first light; cause at least one ambient light cancellation circuit to generate a first countering signal based on a value of an electrical signal generated by the light detector while the light emitter is not emitting light; cause the at least one ambient light cancellation circuit to counter, using the first countering signal, a portion of the first electrical signal associated with an ambient light component; cause at least one an analog to digital converter (ADC) to generate a first digital signal based on values of the first electrical signal; cause the at least one light emitter to emit second light having a second wavelength in a second range of wavelengths; cause the at least one light detector to generate a second electrical signal based on light detected by the light detector while the light emitter emits the second light; cause the at least one ambient light cancellation circuit to generate a second countering signal based on a value of an electrical signal generated by the light detector while the light emitter is not emitting light; cause the at least one ambient light cancellation circuit to counter, using the second countering signal, a portion of the second electrical signal associated with an ambient light component; cause the at least one ADC to generate a second digital signal based on values of the second electrical signal; and determine or update a saturation of peripheral oxygen (SpO2) metric based on the first digital signal and the second digital signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification