Integrated electronics for photoplethysmography and electrocardiography
First Claim
1. A system comprising:
- a light emitter, wherein the light emitter is configured to illuminate a portion of subsurface vasculature via an external body surface;
a photodetector, wherein the photodetector is configured to receive light emitted from the portion of subsurface vasculature responsive to illumination by the light emitter;
an electrocardiogram sensor, wherein the electrocardiogram sensor is configured to detect an electrocardiographic signal via the external body surface;
an amplifier;
a multiplexer, wherein the multiplexer is electrically connected to an output of the photodetector, an output of the electrocardiogram sensor, and an input of the amplifier, and wherein the multiplexer is controllable to selectively connect the output of the photodetector and the output of the electrocardiogram sensor to the input of the amplifier;
an analog-to-digital converter, wherein the analog-to-digital converter is configured to generate digital codes based on an output of the amplifier; and
a controller, wherein the controller is configured to perform controller operations comprising;
operating the light emitter, during a first plurality of specified periods of time, to illuminate the portion of subsurface vasculature;
operating the multiplexer, during the first plurality of specified periods of time, to connect the output of the photodetector to the input of the amplifier;
operating the analog-to-digital converter to generate a first plurality of digital codes based on the output of the amplifier during the first plurality of specified periods of time;
operating the multiplexer, during a second plurality of specified periods of time, to connect the output of the electrocardiogram sensor to the input of the amplifier, wherein the second plurality of specified periods of time are offset in time from the first plurality of specified periods of time; and
operating the analog-to-digital converter to generate a second plurality of digital codes based on the output of the amplifier during the second plurality of specified periods of time.
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Accused Products
Abstract
Devices and systems are provided to electrically and optically detect hemodynamic properties of a body. Such devices are configured to detect electrocardiographic signals and photoplethysmographic signals and to operate a single analog-to-digital converter (ADC) to sample one or more of each of such signals. This includes operating a multiplexer to connect electrical signals related to the detected optical and electrical properties to the single ADC during respective different sampling times or periods. This can include connecting the detected electrocardiographic signals and photoplethysmographic signals to the ADC during alternating periods of time. Using a single ADC to sample one or more of each of electrocardiographic signals and photoplethysmographic signals can provide samples of such signals that have a relative timing that is known, stable, and controllable.
7 Citations
20 Claims
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1. A system comprising:
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a light emitter, wherein the light emitter is configured to illuminate a portion of subsurface vasculature via an external body surface; a photodetector, wherein the photodetector is configured to receive light emitted from the portion of subsurface vasculature responsive to illumination by the light emitter; an electrocardiogram sensor, wherein the electrocardiogram sensor is configured to detect an electrocardiographic signal via the external body surface; an amplifier; a multiplexer, wherein the multiplexer is electrically connected to an output of the photodetector, an output of the electrocardiogram sensor, and an input of the amplifier, and wherein the multiplexer is controllable to selectively connect the output of the photodetector and the output of the electrocardiogram sensor to the input of the amplifier; an analog-to-digital converter, wherein the analog-to-digital converter is configured to generate digital codes based on an output of the amplifier; and a controller, wherein the controller is configured to perform controller operations comprising; operating the light emitter, during a first plurality of specified periods of time, to illuminate the portion of subsurface vasculature; operating the multiplexer, during the first plurality of specified periods of time, to connect the output of the photodetector to the input of the amplifier; operating the analog-to-digital converter to generate a first plurality of digital codes based on the output of the amplifier during the first plurality of specified periods of time; operating the multiplexer, during a second plurality of specified periods of time, to connect the output of the electrocardiogram sensor to the input of the amplifier, wherein the second plurality of specified periods of time are offset in time from the first plurality of specified periods of time; and operating the analog-to-digital converter to generate a second plurality of digital codes based on the output of the amplifier during the second plurality of specified periods of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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illuminating, by a light emitter operated by a controller during a first plurality of specified periods of time, a portion of subsurface vasculature via an external body surface; connecting, by a multiplexer operated by the controller during the first plurality of specified periods of time, an output of a photodetector to an input of an amplifier, wherein the photodetector is configured to receive light emitted from the portion of subsurface vasculature responsive to illumination by the light emitter; generating, by an analog-to-digital converter operated by the controller during the first plurality of specified periods of time, a first plurality of digital codes based on the output of the amplifier; connecting, by the multiplexer operated by the controller during a second plurality of specified periods of time, an output of an electrocardiogram sensor to the input of the amplifier, wherein the second plurality of specified periods of time are offset in time from the first plurality of specified periods of time, and wherein the electrocardiogram sensor is configured to detect an electrocardiographic signal via the external body surface; and generating, by the analog-to-digital converter operated by the controller during the second plurality of specified periods of time, a second plurality of digital codes based on the output of the amplifier. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification