Signal processing apparatus
First Claim
Patent Images
1. A method of determining blood oxygen saturation comprising:
- sensing physiological signals resulting from the attenuation of light of at least first and second wavelengths by body tissue carrying pulsing blood;
determining at least two values corresponding to oxygen saturation based upon at least two alternative methods of using the physiological signals; and
determining a resulting value for oxygen saturation from the at least two values corresponding to oxygen saturation, wherein one of the alternative methods comprises at least one calculation in the frequency domain.
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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 correlation 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 blood oximetry measurements.
117 Citations
39 Claims
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1. 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;
determining at least two values corresponding to oxygen saturation based upon at least two alternative methods of using the physiological signals; and
determining a resulting value for oxygen saturation from the at least two values corresponding to oxygen saturation, wherein one of the alternative methods comprises at least one calculation in the frequency domain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 24, 25, 26, 27)
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20. A method of determining pulse rate 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;
determining at least two values corresponding to pulse rate based upon at least two alternative methods of processing the sensed physiological signals from at least one of the first and second wavelengths; and
determining a resulting value for pulse rate from the at least two values corresponding to pulse rate. - View Dependent Claims (21, 22, 23)
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28. A method of determining a physiological characteristic of pulsing blood, the method comprising:
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receiving first and second intensity signals from a light-sensitive detector which detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
providing at least first and second calculation techniques, wherein each calculation technique is capable of generating at least one value representative of the physiological characteristic of the pulsing blood based upon at least one of the first and second intensity signals; and
utilizing at least one of the first and second calculation techniques to determine a resulting value indicative of the physiological characteristic, wherein at least one of the calculation techniques comprises a spectral domain technique.
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29. A method of determining a physiological characteristic of pulsing blood, the method comprising:
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receiving first and second intensity signals from a light-sensitive detector which detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
providing at least first and second calculation techniques, wherein each calculation technique is capable of generating at least one value representative of the physiological characteristic of the pulsing blood based upon at least one of the first and second intensity signals; and
utilizing at least one of the first and second calculation techniques to determine a resulting value indicative of the physiological characteristic, further comprising generating at least one output value from each of the first and second calculation techniques and wherein the utilizing comprises combining the output values to determine the resulting value. - View Dependent Claims (30, 31, 32, 33)
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34. A method of determining a physiological characteristic of pulsing blood, the method comprising:
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receiving first and second intensity signals from a light-sensitive detector which detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
providing at least first and second calculation techniques, wherein each calculation technique is capable of generating at least one value representative of the physiological characteristic of the pulsing blood based upon at least one of the first and second intensity signals; and
utilizing at least one of the first and second calculation techniques to determine a resulting value indicative of the physiological characteristic, wherein each calculation technique relies on at least partially differing strengths associated with that calculation technique.
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35. A method of determining a physiological characteristic of pulsing blood, the method comprising:
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receiving first and second intensity signals from a light-sensitive detector which detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood; and
utilizing at least one of at least first and second calculation techniques to determine a value representing the physiological parameter based upon at least one of the first and second intensity signals, further comprising qualifying the value for inclusion into the step of utilizing depending upon different conditions of the first and second intensity signals.
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36. A method of determining blood oxygen saturation, the method comprising:
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receiving first and second intensity signals from a light-sensitive detector which detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
based on a first technique using at least one of the first and second intensity signals, calculating a first possible value indicative of oxygen saturation of the pulsing blood;
based on a second technique different from the first technique and using at least one of the first and second intensity signals, calculating a second possible value indicative of the oxygen saturation; and
determining a representative output value of the oxygen saturation based on the first and second possible values indicative of the oxygen saturation, wherein at least one of the first and second techniques comprises a spectral domain technique.
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37. A method of determining blood oxygen saturation, the method comprising:
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receiving first and second intensity signals from a light-sensitive detector which detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
based on a first technique using at least one of the first and second intensity signals, calculating a first possible value indicative of oxygen saturation of the pulsing blood;
based on a second technique different from the first technique and using at least one of the first and second intensity signals, calculating a second possible value indicative of the oxygen saturation; and
determining a representative output value of the oxygen saturation based on the first and second possible values indicative of the oxygen saturation, wherein each of the first and second techniques relies on at least partially differing strengths associated with that technique.
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38. A method of determining blood oxygen saturation comprising:
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receiving first and second intensity signals from a light-sensitive detector which detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
determining at least two values indicative to oxygen saturation based upon at least two different methods of obtaining data from the first and second intensity signals; and
determining a resulting value indicative of oxygen saturation from the at least two values, wherein each different method relies on at least partially differing strengths associated with that different method.
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39. A method of monitoring blood oxygen saturation of pulsing blood during motion induced noise, the method comprising:
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receiving first and second intensity signals from a light-sensitive detector which detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
wherein the fist and second intensity signals include motion induced noise;
determining at least two values corresponding to oxygen saturation based upon at least two different methods of obtaining data from the first and second intensity signals; and
determining a resulting value for oxygen saturation from the at least two values corresponding to oxygen saturation, wherein each different method relies on at least partially differing strengths associated with that different method.
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Specification