Signal processing apparatus
DCFirst 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:
- activating a first light source of said optical probe for a first active time period;
deactivating said first light source of said optical probe for a first inactive time period, said first inactive time period having no light sources of said optical probe activated;
activating a second light source of said optical probe for a second active time period;
deactivating said second light source of said optical probe for a second inactive time period, said second inactive time period having no light sources of said optical probe activated;
receiving physiological signals representative of attenuation of light during at least said first and second active and said first and second inactive time periods, said attenuated light comprising at least first and second wavelengths, said attenuation caused at least by body tissue carrying pulsing blood; and
with one or more processors of said patient monitoring device, 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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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.
952 Citations
32 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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activating a first light source of said optical probe for a first active time period; deactivating said first light source of said optical probe for a first inactive time period, said first inactive time period having no light sources of said optical probe activated; activating a second light source of said optical probe for a second active time period; deactivating said second light source of said optical probe for a second inactive time period, said second inactive time period having no light sources of said optical probe activated; receiving physiological signals representative of attenuation of light during at least said first and second active and said first and second inactive time periods, said attenuated light comprising at least first and second wavelengths, said attenuation caused at least by body tissue carrying pulsing blood; and with one or more processors of said patient monitoring device, 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, 7, 8, 9)
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10. 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, said first and second intensity signals each including a first time where it is responsive to ambient light and a respective one of said first and second wavelengths of light and a second time where it is responsive to said ambient light; electronically determining with a processor at least two values corresponding to pulse rate based upon at least two different methods of processing the intensity signals; and electronically determining with said processor a resulting value for pulse rate from the at least two values corresponding to pulse rate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of determining pulse rate comprising:
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driving a plurality of light sources of a noninvasive optical sensor to include inactive portions of a drive cycle where none of said plurality of light sources are active; sensing physiological signals resulting from the attenuation of light of said light sources of at least first and second wavelengths by body tissue carrying pulsing blood and signals corresponding to ambient light; determining with a signal processor 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 the signals corresponding to ambient light; and determining with a signal processor a resulting value for pulse rate from the at least two values corresponding to pulse rate. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification