Methods and systems for determining physiological information based on low and high frequency components
First Claim
1. A subject pulse oximetry monitoring system for determining physiological information of a subject, comprising:
- a pulse oximetry sensor configured to generate an intensity signal, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject; and
a pulse oximeter coupled to the pulse oximetry sensor, wherein the pulse oximeter is configured to;
filter the intensity signal into a low frequency component and a high frequency component, wherein each of the low frequency component and the high frequency component is a candidate for being associated with a physiological rate of the subject;
determine one or more metrics for each of the low frequency component and the high frequency component;
compare the one or more metrics determined based on the low frequency component with the one or more metrics determined based on the high frequency component;
select either the low frequency component or the high frequency component based on the comparison;
determine a value indicative of the physiological rate of the subject based on the selected frequency component, wherein the physiological rate is not determined from the frequency component that was not selected; and
display the value indicative of the physiological rate of the subject on a display.
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Accused Products
Abstract
A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
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Citations
24 Claims
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1. A subject pulse oximetry monitoring system for determining physiological information of a subject, comprising:
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a pulse oximetry sensor configured to generate an intensity signal, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject; and a pulse oximeter coupled to the pulse oximetry sensor, wherein the pulse oximeter is configured to; filter the intensity signal into a low frequency component and a high frequency component, wherein each of the low frequency component and the high frequency component is a candidate for being associated with a physiological rate of the subject; determine one or more metrics for each of the low frequency component and the high frequency component; compare the one or more metrics determined based on the low frequency component with the one or more metrics determined based on the high frequency component; select either the low frequency component or the high frequency component based on the comparison; determine a value indicative of the physiological rate of the subject based on the selected frequency component, wherein the physiological rate is not determined from the frequency component that was not selected; and display the value indicative of the physiological rate of the subject on a display. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A processing module of a pulse oximeter for determining physiological information of a subject, wherein the processing module is configured to:
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receive an intensity signal derived from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject; filter the intensity signal into a low frequency component and a high frequency component, wherein each of the low frequency component and the high frequency component is a candidate for being associated with a physiological rate of the subject; determine one or more metrics for each of the low frequency component and the high frequency component; compare the one or more metrics determined based on the low frequency component with the one or more metrics determined based on the high frequency component; select either the low frequency component or the high frequency component based on the comparison; determine a value indicative of the physiological rate of the subject based on the selected frequency component, wherein the physiological rate is not determined from the frequency component that was not selected; and display the value indicative of the physiological rate of the subject on a display. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for determining physiological information of a subject using a pulse oximeter, comprising:
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receiving, using the pulse oximeter, an intensity signal derived from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject; filtering, using the pulse oximeter, the intensity signal into a low frequency component and a high frequency component, wherein each of the low frequency component and the high frequency component is a candidate for being associated with a physiological rate of the subject; determining, using the pulse oximeter, one or more metrics for each of the low frequency component and the high frequency component; comparing, using the pulse oximeter, the one or more metrics determined based on the low frequency component with the one or more metrics determined based on the high frequency component; selecting, using the pulse oximeter, either the low frequency component or the high frequency component based on the comparison; determining, using the pulse oximeter, a value indicative of the physiological rate of the subject based on the selected frequency component, wherein the physiological rate is not determined from the frequency component that was not selected; and display the value indicative of the physiological rate of the subject on a display. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A non-transitory computer-readable medium for use in determining physiological information of a subject, the non-transitory computer-readable medium comprising:
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computer program instructions recorded thereon for causing a pulse oximeter to; receive an intensity signal derived from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject; filter the intensity signal into a low frequency component and a high frequency component, wherein each of the low frequency component and the high frequency component is a candidate for being associated with a physiological rate of the subject; determine one or more metrics for each of the low frequency component and the high frequency component; compare the one or more metrics determined based on the low frequency component with the one or more metrics determined based on the high frequency component; select either the low frequency component or the high frequency component based on the comparison; determine a value indicative of the physiological rate of the subject based on the selected frequency component, wherein the physiological rate is not determined from the frequency component that was not selected; and display the value indicative of the physiological rate of the subject on a display. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification