Use of time indexed plethysmographic spectral data in assessing saturation estimation validity
First Claim
1. A method for use in a pulse oximetry system, comprising the steps of:
- obtaining a time-based signal representative of an optical signal potentially including physiological information based on interaction with a patient;
first performing a transform on said time-based signal to obtain frequency related information;
second performing an analysis on said frequency related information to obtain a value independent of a shape and waveform of a spectrum of said time-based signal; and
using said value to determine a quality of said time-based signal in relation to one of physiological information content and artifact content.
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Abstract
Detector signals in a pulse oximeter are analyzed to determine a quality of the signals in relation to desired information content or artifact content. The analysis involves performing a transform on a signal to obtain frequency related information and analyzing the frequency related information to obtain a value independent of a shape and waveform of a spectrum of the time-based signal. In one implementation, the analysis involves the relative amplitude or power measures of corresponding peaks in the red and infrared spectra. For example, the ratio of the amplitude of the fundamental peak in the red spectrum and the amplitude of the fundamental peak in the infrared spectrum may be tracked over time. In another implementation, the analysis involves consideration of the relative phase of the fundamental and harmonic components of a signal. In either case, signals including desired physiological information can be distinguished from artifact affected signals. Based on this analysis, signals can be validated or an appropriate processing algorithm can be selected.
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Citations
24 Claims
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1. A method for use in a pulse oximetry system, comprising the steps of:
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obtaining a time-based signal representative of an optical signal potentially including physiological information based on interaction with a patient;
first performing a transform on said time-based signal to obtain frequency related information;
second performing an analysis on said frequency related information to obtain a value independent of a shape and waveform of a spectrum of said time-based signal; and
using said value to determine a quality of said time-based signal in relation to one of physiological information content and artifact content. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for use in a pulse oximetry system, comprising the steps of:
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obtaining an input signal representative of an optical signal potentially including physiological information based on interaction with a patient;
determining first information regarding an energy related parameter for a first signal component in a first channel of said input signal;
determining second information regarding an energy related parameter for the first signal component in a second signal channel different than the first signal channel of said input signal, wherein said first channel corresponds to a different spectral component of said optical signal than said second channel; and
using said first information and said second information to determine a quality of the input signal in relation to one of a desired information content and an artifact content. - View Dependent Claims (15, 16, 17, 18)
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19. A pulse oximetry apparatus, comprising:
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a port for receiving an input signal representative of an optical signal potentially including physiological information based on interaction with a patient; and
a processor operative for determining first information regarding an energy related parameter for a first signal component in a first signal channel, determining second information regarding an energy related parameter for the first signal component in a second signal channel different than the first channel, and using the first information and second information to determine a quality of the input signal in relation to one of desired information content and artifact content. - View Dependent Claims (20, 21)
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22. A method for use in a pulse oximetry system, comprising the steps of:
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obtaining an input signal representative of an optical signal potentially including physiological information based on interaction with a patient;
identifying first and second components of said input signal for analysis;
evaluating said first and second components to distinguish potential artifact content from potential arrhythmia content; and
selectively processing said input signal based on said determination. - View Dependent Claims (23, 24)
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Specification