Signal processing apparatus
First Claim
Patent Images
1. A pulse oximetry system comprising:
- an optical probe including light emitting elements and a light detecting element, said light detecting element configured to detect light emitted from the light emitting elements and attenuated by tissue of a patient, the light detector further configured to output a signal, the signal including a plurality of intensity signals indicative of the detected attenuated light, said signal comprising signal portions and noise portions; and
a patient monitor comprising;
a sensor port communicating with said optical probe to receive said signal; and
a signal processor configured to determine an indication of correlation between at least two of the plurality of intensity signals and, based on the indication of correlation, determine whether to include one or more of the plurality of intensity signals in a determination of a physiological parameter, the signal processor further configured to execute a closed loop adaptive process using said intensity signals to determine an indication of a physiological parameter.
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Abstract
The present disclosure describes a method and an apparatus for analyzing measured signals using various processing techniques. In certain embodiments, the measured signals are physiological signals. In certain embodiments, the measurements relate to blood constituent measurements including blood oxygen saturation.
955 Citations
32 Claims
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1. A pulse oximetry system comprising:
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an optical probe including light emitting elements and a light detecting element, said light detecting element configured to detect light emitted from the light emitting elements and attenuated by tissue of a patient, the light detector further configured to output a signal, the signal including a plurality of intensity signals indicative of the detected attenuated light, said signal comprising signal portions and noise portions; and a patient monitor comprising; a sensor port communicating with said optical probe to receive said signal; and a signal processor configured to determine an indication of correlation between at least two of the plurality of intensity signals and, based on the indication of correlation, determine whether to include one or more of the plurality of intensity signals in a determination of a physiological parameter, the signal processor further configured to execute a closed loop adaptive process using said intensity signals to determine an indication of a physiological parameter. - View Dependent Claims (2, 3)
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4. A method of determining a physiological parameter of a patient using a pulse oximetry system, the method comprising:
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communicating a plurality of light emitter drive signals to a noninvasive optical sensor comprising light emitters capable of producing light of at least two wavelengths; receiving a signal indicative of light attenuated by tissue of a patient, the signal including a plurality of intensity signals attenuated by tissue of a patient; determining an indication of correlation between the intensity signals for the at least two wavelengths; and based on the indication of correlation, determining a reliability of the intensity signals for use in a determination of a physiological characteristic of pulsing blood closed loop adaptive processing the received signal to provide at least one output signal; and calculating a physiological parameter based upon the at least one output signal and the reliability. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 32)
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23. A method of determining a physiological parameter of a patient comprising:
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communicating at least one light emitter drive signal to a noninvasive optical sensor comprising light emitters capable of producing light of at least two wavelengths; receiving a signal indicative of light attenuated by tissue of a patient comprising at least first and second portions corresponding to the at least first and second wavelengths; processing the at least one signal using a least squares algorithm and a determination of an indication of correlation between the first and second portions to provide at least one output signal; and calculating oxygen saturation based upon the at least one output signal; wherein the at least one signal has a desired portion and a noise portion, and wherein the processing reduces noise in the at least one signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification