Signal processing apparatus
First Claim
1. A physiological monitoring system including an optical probe configured to output one or more intensity signals representative of at least one physiological characteristic of body tissue, and a signal processing device configured to accept one or more signals representative of the physiological characteristic and configured to determine a resulting value indicative of the physiological characteristic, the physiological monitoring system comprising:
- an optical probe including a light-sensitive detector configured to detect light of at least first and second wavelengths attenuated by body tissue carrying pulsing blood and configured to output one or more intensity signals based on the detected light; and
a signal processing device including;
a first calculator capable of utilizing a first calculation technique to determine at least a first value representative of at least one physiological characteristic of the pulsing blood based on at least one of the one or more intensity signals, a second calculator capable of utilizing a second calculation technique to determine at least a second value representative of the physiological characteristic based on at least one of the one or more intensity signals, and an processing module configured to utilize at least one of the first and second calculators to determine a resulting value indicative of the physiological characteristic.
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Abstract
The present invention involves method and apparatus for analyzing measured signals that are modeled as containing primary and secondary portions. Coefficients relate the two signals according to a model defined in accordance with the present invention. In one embodiment, the present invention involves utilizing a transformation which evaluates a plurality of possible signal coefficients in order to find appropriate coefficients. Alternatively, the present invention involves using statistical functions or Fourier transform and windowing techniques to determine the coefficients relating to two measured signals. Use of this invention is described in particular detail with respect to blood oximetry measurements.
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Citations
61 Claims
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1. A physiological monitoring system including an optical probe configured to output one or more intensity signals representative of at least one physiological characteristic of body tissue, and a signal processing device configured to accept one or more signals representative of the physiological characteristic and configured to determine a resulting value indicative of the physiological characteristic, the physiological monitoring system comprising:
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an optical probe including a light-sensitive detector configured to detect light of at least first and second wavelengths attenuated by body tissue carrying pulsing blood and configured to output one or more intensity signals based on the detected light; and
a signal processing device including;
a first calculator capable of utilizing a first calculation technique to determine at least a first value representative of at least one physiological characteristic of the pulsing blood based on at least one of the one or more intensity signals, a second calculator capable of utilizing a second calculation technique to determine at least a second value representative of the physiological characteristic based on at least one of the one or more intensity signals, and an processing module configured to utilize at least one of the first and second calculators to determine a resulting value indicative of the physiological characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A patient monitoring apparatus comprising:
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a light-sensitive detector configured to detect light of at least first and second wavelengths attenuated by body tissue carrying pulsing blood and configured to output one or more output signals based on the detected light; and
an electronic processing system capable of utilizing (i) a first calculation technique adapted to remove motion induced noise from one of the one or more output signals, and (ii) a second calculation technique, wherein the electronic processing system determines a value indicative a physiological parameter through utilization of at least one of the first and second calculation techniques. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. A patient monitoring apparatus comprising:
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a light-sensitive detector configured to detect light of at least first and second wavelengths attenuated by body tissue carrying pulsing blood and configured to output one or more output signals based on the detected light; and
an electronic processing system capable of utilizing a first calculation technique based at least in part on a time domain analysis of at least one of the one or more output signals, and a second calculation technique based at least in part on a frequency domain analysis of at least one of the one or more output signals, wherein the electronic processing system determines a value indicative a physiological parameter through utilization of at least one of the first and second calculation techniques.
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Specification