Methods and systems for qualifying physiological values based on metrics
First Claim
1. A subject monitoring pulse oximetry system for updating a display rate for a subject, comprising:
- a pulse oximetry sensor configured to detect light attenuated by the subject and generate a photoplethysmographic (PPG) signal based on the detected attenuated light;
a pulse oximeter coupled to the pulse oximetry sensor; and
a display coupled to the pulse oximeter, wherein the display is configured to display the display rate for the subject, wherein;
the pulse oximeter is configured to;
determine a value indicative of a physiological rate of the subject;
determine a first metric based on the PPG signal;
perform a filtering calculation based on the PPG signal to generate a filtered PPG signal, wherein the filtering calculation comprises a high-pass filter having a cut-off set at a frequency higher than a frequency corresponding to the value indicative of the physiological rate of the subject;
determine a second metric based on the filtered PPG signal;
qualify the value indicative of the physiological rate of the subject based on the first and second metrics; and
update the display rate on the display based on the qualified value indicative of the physiological rate.
2 Assignments
0 Petitions
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.
35 Citations
28 Claims
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1. A subject monitoring pulse oximetry system for updating a display rate for a subject, comprising:
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a pulse oximetry sensor configured to detect light attenuated by the subject and generate a photoplethysmographic (PPG) signal based on the detected attenuated light; a pulse oximeter coupled to the pulse oximetry sensor; and a display coupled to the pulse oximeter, wherein the display is configured to display the display rate for the subject, wherein; the pulse oximeter is configured to; determine a value indicative of a physiological rate of the subject; determine a first metric based on the PPG signal; perform a filtering calculation based on the PPG signal to generate a filtered PPG signal, wherein the filtering calculation comprises a high-pass filter having a cut-off set at a frequency higher than a frequency corresponding to the value indicative of the physiological rate of the subject; determine a second metric based on the filtered PPG signal; qualify the value indicative of the physiological rate of the subject based on the first and second metrics; and update the display rate on the display based on the qualified value indicative of the physiological rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A pulse oximetry processing module for updating a display rate for a subject on a display, wherein the pulse oximetry processing module is coupled to the display and comprises non-transitory computer readable media configured to store instructions that instruct the pulse oximetry processing module to:
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receive a photoplethysmographic (PPG) signal from a pulse oximetry sensor, wherein the pulse oximetry sensor detects light attenuated by the subject and generates the PPG signal based on the detected attenuated light; determine a value indicative of a physiological rate of the subject; determine a first metric based on the PPG signal; perform a filtering calculation based on the PPG signal to generate a filtered PPG signal, wherein the filtering calculation comprises a high-pass filter having a cut-off set at a frequency higher than a frequency corresponding to the value indicative of the physiological rate of the subject; determine a second metric based on the filtered PPG signal; qualify the value indicative of the physiological rate of the subject based on the first and second metrics; and update the display rate on the display based on the qualified value indicative of the physiological rate. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for updating a display rate for a subject on a display, comprising:
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receiving, using a pulse oximeter, a photoplethysmographic (PPG) signal from a pulse oximetry sensor, wherein the pulse oximetry sensor detects light attenuated by the subject and generates the PPG signal based on the detected attenuated light; determining, using the pulse oximeter, a value indicative of a physiological rate of the subject; determining, using the pulse oximeter, a first metric based on the PPG signal; performing, using the pulse oximeter, a filtering calculation based on the PPG signal to generate a filtered PPG signal, wherein the filtering calculation comprises a high-pass filter having a cut-off set at a frequency higher than a frequency corresponding to the value indicative of the physiological rate of the subject; determining, using the pulse oximeter, a second metric based on the filtered PPG signal; qualifying, using the pulse oximeter, the value indicative of the physiological rate of the subject based on the first and second metrics; and updating, using the pulse oximeter, the display rate on the display based on the qualified value indicative of the physiological rate. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A non-transitory computer-readable medium for use in updating a display rate for a subject on a display, the non-transitory computer-readable medium comprising:
computer program instructions recorded thereon for causing a pulse oximeter to; receiving an intensity receive a photoplethysmographic (PPG) signal from a pulse oximetry sensor, wherein the pulse oximetry sensor detects light attenuated by the subject and generates the PPG signal based on the detected attenuated light; determine a value indicative of a physiological rate of the subject; determine a first metric based on the PPG signal; perform a filtering calculation based on the PPG signal to generate a filtered PPG signal, wherein the filtering calculation comprises a high-pass filter having a cut-off set at a frequency higher than a frequency corresponding to the value indicative of the physiological rate of the subject; determine a second metric based on the filtered PPG signal; qualify the value indicative of the physiological rate of the subject based on the first and second metrics; and update the display rate on the display based on the qualified value indicative of the physiological rate. - View Dependent Claims (23, 24, 25, 26, 27, 28)
Specification