Signal processing apparatus
First Claim
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1. A non-invasive optical based physiological monitoring system configured to determine a plurality of physiological parameters, the monitoring system comprising:
- a plurality of light emitting elements configured to emit light of at least two different wavelengths into tissue of a patient;
a detector configured to detect the light of the at least two different wavelengths after it has been attenuated by the patient'"'"'s tissue and produce a signal indicative of the detected light; and
a processing system configured to receive the signal produced by the detector and to process only the signal using adaptive techniques in order to determine a first signal component indicative of a first physiological parameter and a second signal component indicative of a second physiological parameter;
wherein the first physiological parameter is oxygen saturation and the second physiological parameter is respiration rate and wherein the second signal component is used by the processing system as a reference signal when determining the first physiological parameter.
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Abstract
The present invention involves a method and an apparatus for analyzing measured signals, including the determination of a measurement of oxygen saturation and respiration rate in the measured signals during a calculation of a physiological parameter of a monitored patient. Use of this invention is described in particular detail with respect to oximetry-based measurements.
977 Citations
9 Claims
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1. A non-invasive optical based physiological monitoring system configured to determine a plurality of physiological parameters, the monitoring system comprising:
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a plurality of light emitting elements configured to emit light of at least two different wavelengths into tissue of a patient; a detector configured to detect the light of the at least two different wavelengths after it has been attenuated by the patient'"'"'s tissue and produce a signal indicative of the detected light; and a processing system configured to receive the signal produced by the detector and to process only the signal using adaptive techniques in order to determine a first signal component indicative of a first physiological parameter and a second signal component indicative of a second physiological parameter; wherein the first physiological parameter is oxygen saturation and the second physiological parameter is respiration rate and wherein the second signal component is used by the processing system as a reference signal when determining the first physiological parameter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-invasive optical based physiological monitoring system configured to determine a plurality of physiological parameters, the monitoring system comprising:
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a plurality of light emitting elements configured to emit light of at least two different wavelengths into tissue of a patient; a detector configured to detect the light of the at least two different wavelengths after it has been attenuated by the patient'"'"'s tissue and produce a signal indicative of the detected light; and a processing system configured to receive the signal produced by the detector and determine a respiration rate of the patient using only the signal and at least a wavelet transform; and said processing system further configured to determine an oxygen saturation measurement from the signal produced by the detector, said determining said oxygen saturation measurement comprising determining a first signal portion and determining a reference signal portion, where the first signal portion is caused by an arterial pulse and the reference signal portion is substantially caused by respiration of the patient.
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8. A method of determining blood oxygen saturation comprising:
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sensing physiological signals resulting from the attenuation of light of at least first and second wavelengths by body tissue carrying pulsing blood; processing the sensed physiological signals using a wavelet transform in order to determine a respiration portion of the sensed physiological signals caused by respiration of a patient; and determining an oxygen saturation measurement, wherein said processing the sensed physiological signals comprises determining a first signal portion and a reference signal portion where the first signal portion is caused by an arterial pulse and the reference signal portion is substantially caused by the respiration of the patient. - View Dependent Claims (9)
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Specification