Method and apparatus for estimating a physiological parameter
First Claim
1. In a physiological monitor, a method for determining a patient'"'"'s pulse rate using data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, the method comprising:
- tracking the pulse rate in the data using an adaptive comb filter, said data having signal portions corresponding to the pulse rate and signal portions corresponding to noise;
periodically calculating a frequency power spectrum of one of said wavelengths; and
using the frequency power spectrum in a pulse rate calculator to determine the pulse rate or to verify the pulse rate calculated by the pulse rate calculator.
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Abstract
In a physiological monitor, a method and an apparatus for determining a patient'"'"'s pulse rate using data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient. The method includes tracking the pulse rate in the data using an adaptive comb filter, the data having signal portions corresponding to the pulse rate and signal portions corresponding to noise, periodically calculating a frequency power spectrum of one of the wavelengths, and using the frequency power spectrum in a pulse rate calculator to determine the pulse rate or to verify the pulse rate calculated by the pulse rate calculator.
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Citations
38 Claims
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1. In a physiological monitor, a method for determining a patient'"'"'s pulse rate using data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, the method comprising:
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tracking the pulse rate in the data using an adaptive comb filter, said data having signal portions corresponding to the pulse rate and signal portions corresponding to noise; periodically calculating a frequency power spectrum of one of said wavelengths; and using the frequency power spectrum in a pulse rate calculator to determine the pulse rate or to verify the pulse rate calculated by the pulse rate calculator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A physiological monitor for monitoring a pulse rate of a patient using data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, said monitor comprising a processor configured to:
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track the pulse rate in the data using an adaptive comb filter, said data having signal portions corresponding to the pulse rate and signal portions corresponding to noise; periodically calculate a frequency power spectrum of one of said wavelengths; and use the frequency power spectrum in a pulse rate calculator to determine the pulse rate or to verify the pulse rate calculated by the pulse rate calculator. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. In a physiological monitor, a method for determining a patient'"'"'s pulse rate using time-domain data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, said data having signal portions corresponding to the pulse rate and signal portions corresponding to noise, the method comprising:
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obtaining a first estimate of the pulse rate; transforming the time-domain data into a spectral domain data; identifying a plurality of spectral peaks at non-zero frequencies in said spectral domain data; processing said plurality of spectral peaks in a pulse rate calculator to identify a fundamental frequency and one or more harmonics of the fundamental frequency; and using one or more rules for verifying or resetting the first estimate of the pulse rate from said processing. - View Dependent Claims (23, 24, 25, 26)
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27. A physiological monitor for monitoring a pulse rate of a patient using time-domain data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, said monitor comprising a processor configured to:
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obtain a first estimate of the pulse rate; transform the time-domain data into a spectral domain data; identify a plurality of spectral peaks at non-zero frequencies in said spectral domain data; process said plurality of spectral peaks in a pulse rate calculator to identify a fundamental frequency and one or more harmonics of the fundamental frequency; and use one or more rules to verify or reset the first estimate of the pulse rate from said processing. - View Dependent Claims (28, 29, 30)
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31. In a physiological monitor, a method for determining a patient'"'"'s pulse rate using time-domain data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, said data having signal portions corresponding to a plethysmographic waveform and signal portions corresponding to noise, the method comprising:
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transforming one or more of the plurality of wavelengths of the time-domain data into a spectral domain data to obtain a frequency power spectrum; classifying spectral lines in the frequency power spectrum into spectral values corresponding to a fundamental frequency and one or more harmonics of the fundamental frequency; and estimating the pulse rate from the spectral values using one or more rules to obtain an estimated pulse rate, wherein said using one or more rules comprises selectively applying one or more of the rules based on a confidence measure associated with the estimated pulse rate. - View Dependent Claims (32, 33)
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34. In a physiological monitor, a method for determining a patient'"'"'s pulse rate using time-domain data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, said data having signal portions corresponding to a plethysmographic waveform and signal portions corresponding to noise, the method comprising:
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transforming one or more of the plurality of wavelengths of the time-domain data into a spectral domain data to obtain a frequency power spectrum; classifying spectral lines in the frequency power spectrum into spectral values corresponding to a fundamental frequency and one or more harmonics of the fundamental frequency; and estimating the pulse rate from the spectral values using one or more rules to obtain an estimated pulse rate, wherein estimating the pulse rate further includes [by] tracking the pulse rate in the time-domain data using an adaptive comb filter.
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35. A physiological monitor for monitoring a pulse rate of a patient using time-domain data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, said monitor comprising a processor configured to:
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transform one or more of the plurality of wavelengths of the time-domain data into a spectral domain data to obtain a frequency power spectrum; classify spectral lines in the frequency power spectrum into spectral values corresponding to a fundamental frequency and one or more harmonics of the fundamental frequency; and estimate the pulse rate from the spectral values using one or more rules to obtain an estimated pulse rate by selectively applying one or more of the rules based on a confidence measure associated with the estimated pulse rate. - View Dependent Claims (36, 37)
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38. A physiological monitor for monitoring a pulse rate of a patient using time-domain data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient, said monitor comprising a processor configured to:
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transform one or more of the plurality of wavelengths of the time-domain data into a spectral domain data to obtain a frequency power spectrum; classify spectral lines in the frequency power spectrum into spectral values corresponding to a fundamental frequency and one or more harmonics of the fundamental frequency; and estimate the pulse rate from the spectral values using one or more rules to obtain an estimated pulse rate, wherein the estimate the pulse rate processing further includes tracking the pulse rate in the time-domain data using an adaptive comb filter.
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Specification