SIGNAL PROCESSING APPARATUS
First Claim
1. A method of determining a pulse rate of a patient using a patient monitoring device that includes a non-invasive optical probe and signal processing components capable of processing signals received from the non-invasive optical probe and capable of determining the pulse rate, the method comprising:
- receiving physiological signals representative of 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 physiological signals; and
determining a resulting value for pulse rate from the at least two values corresponding to pulse rate.
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Accused Products
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.
129 Citations
22 Claims
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1. A method of determining a pulse rate of a patient using a patient monitoring device that includes a non-invasive optical probe and signal processing components capable of processing signals received from the non-invasive optical probe and capable of determining the pulse rate, the method comprising:
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receiving physiological signals representative of 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 physiological signals; and determining a resulting value for pulse rate from the at least two values corresponding to pulse rate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of determining pulse rate 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 attenuated by body tissue carrying pulsing blood; determining at least two values corresponding to pulse rate based upon at least two different methods of processing the physiological signals; and determining a resulting value for pulse rate from the at least two values corresponding to pulse rate. - View Dependent Claims (8, 9, 10, 11, 12)
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13. 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 (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification