System and method for monitoring cardiorespiratory parameters
First Claim
1. A system for measuring and analyzing respiration and cardiac activity, the system comprising:
- one or more radio-frequency Doppler sensors configured to receive a reflected radio-frequency (RF) signal off a living subject, wherein the RF signal comprises a pulsed RF signal;
a mixer that mixes the reflected signal over a predefined period with an RF signal transmitted toward the living subject, the transmitted signal being associated with the reflected signal; and
a processor configured to analyze the reflected signal to determine a measurement of respiration and cardiac activity of the living subject;
wherein the processor is configured to calculate a parameter of cardiorespiratory performance by relating the measured cardiac activity to the measured respiration over a defined period of measurement.
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Accused Products
Abstract
An apparatus, system, and method is disclosed for monitoring the motion, breathing, heart rate of humans in a convenient and low-cost fashion, and for deriving and displaying useful measurements of cardiorespiratory performance from the measured signals. The motion, breathing, and heart rate signals are obtained through a processing applied to a raw signal obtained in a non-contact fashion, typically using a radio-frequency sensor. Processing into separate cardiac and respiratory components is described. The heart rate can be determined by using either spectral or time-domain processing. The respiratory rate can be calculated using spectral analysis. Processing to derive the heart rate, respiratory sinus arrhythmia, or a ventilatory threshold parameter using the system is described. The sensor, processing, and display can be incorporated in a single device which can be worn or held close to the body while exercising (e.g., in a wristwatch or mobile phone configuration), or alternately placed in a fixed piece of exercise equipment at some distance form the body (e.g., in a treadmill dash panel), and may also be integrated with other sensors, such as position locators.
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Citations
41 Claims
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1. A system for measuring and analyzing respiration and cardiac activity, the system comprising:
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one or more radio-frequency Doppler sensors configured to receive a reflected radio-frequency (RF) signal off a living subject, wherein the RF signal comprises a pulsed RF signal; a mixer that mixes the reflected signal over a predefined period with an RF signal transmitted toward the living subject, the transmitted signal being associated with the reflected signal; and a processor configured to analyze the reflected signal to determine a measurement of respiration and cardiac activity of the living subject; wherein the processor is configured to calculate a parameter of cardiorespiratory performance by relating the measured cardiac activity to the measured respiration over a defined period of measurement. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 38, 40, 41)
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2. A system for measuring and analyzing respiration and cardiac activity, the system comprising:
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one or more radio-frequency Doppler sensors configured to receive a reflected radio-frequency (RF) signal off a living subject, wherein the RF signal comprises a single RF frequency; and a processor configured to analyze the reflected signal to determine a measurement of respiration and cardiac activity of the living subject; wherein the processor is configured to calculate a parameter of cardiorespiratory performance by relating the measured cardiac activity to the measured respiration over a defined period of measurement.
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3. A system for measuring and analyzing respiration and cardiac activity, the system comprising:
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two or more radio-frequency Doppler sensors, each sensor configured to receive at a different radio frequency a reflected radio-frequency (RF) signal off a living subject; a processor configured to analyze the reflected signals to determine a measurement of respiration and cardiac activity of the living subject, wherein the processor is configured to calculate a parameter of cardiorespiratory performance by relating the measured cardiac activity to the measured respiration over a defined period of measurement.
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34. A method for measuring and analyzing respiration and cardiac activity, the method comprising:
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receiving a pulsed radio-frequency (RF) signal, at at least one radio-frequency Doppler sensor, reflected from the living subject; analyzing the reflected signal to produce measurements relating to the respiration and cardiac activity of the living subject; and calculating a parameter of cardiorespiratory performance, using a processor, by relating the measured cardiac activity to the measured respiration over a defined period of measurement. - View Dependent Claims (35, 36, 37, 39)
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Specification