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 patients tissue and produce an analog signal indicative of the detected light;
a delta-sigma converter configured to convert the analog signal to a digital signal; and
a processing system configured to receive the digital signal and to process the signal 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.
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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 but extends to other types of measurements.
970 Citations
15 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 patients tissue and produce an analog signal indicative of the detected light; a delta-sigma converter configured to convert the analog signal to a digital signal; and a processing system configured to receive the digital signal and to process the signal 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. - 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 an analog signal indicative of the detected light; a delta-sigma analog to digital converter configured to convert the analog signal to a digital signal; and a processing system configured to receive the digital signal and determine a respiration rate of the patient. - View Dependent Claims (8, 9, 10)
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11. 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; converting the sensed physiological signals from analog signals to digital signals using a delta-sigma analog digital converter; and processing the converted sensed physiological signals in order to determine a respiration portion of the sensed physiological signals caused by respiration of a patient. - View Dependent Claims (12, 13, 14, 15)
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Specification