ACTIVE-PULSE BLOOD ANALYSIS SYSTEM
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Abstract
An active-pulse blood analysis system has an optical sensor that illuminates a tissue site with multiple wavelengths of optical radiation and outputs sensor signals responsive to the optical radiation after attenuation by pulsatile blood flow within the tissue site. A monitor communicates with the sensor signals and is responsive to arterial pulses within a first bandwidth and active pulses within a second bandwidth so as to generate arterial pulse ratios and active pulse ratios according to the wavelengths. An arterial calibration curve relates the arterial pulse ratios to a first arterial oxygen saturation value and an active pulse calibration curve relates the active pulse ratios to a second arterial oxygen saturation value. Decision logic outputs one of the first and second arterial oxygen saturation values based upon perfusion and signal quality.
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Citations
34 Claims
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1-18. -18. (canceled)
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19. An active-pulse blood analysis system comprising:
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an optical sensor that illuminates a tissue site with multiple wavelengths of optical radiation and that outputs sensor data responsive to the optical radiation after attenuation by pulsatile blood flow within the tissue site; one or more filters configured to receive the sensor data and separate the sensor data into arterial pulse data and active-pulse data; one or more memory devices storing an arterial calibration curve that relates arterial pulse ratios to oxygen saturation values; one or more processor configured to; receive the arterial pulse data and active-pulse data, generate an arterial ratio from the arterial pulse data, generate an active-pulse ratio from the active-pulse data, output an arterial saturation value (SpO2) by comparing the generated arterial ratio to the arterial calibration curve, and output a venous oxygen saturation value (SpvO2A) by comparing the generated active-pulse ratio to the arterial calibration curve. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An active-pulse blood analysis method comprising:
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receiving sensor data responsive to optical radiation after attenuation by pulsatile blood flow within the tissue site from an optical sensor that illuminates a tissue site with multiple wavelengths of optical radiation; filtering the sensor data to separate the sensor data into arterial pulse data and active-pulse data; calculating an arterial ratio from the arterial pulse data; calculating an active-pulse ratio from the active-pulse data; outputting an arterial saturation value (SpO2) by comparing the calculated arterial ratio to an arterial calibration curve that relates arterial pulse ratios to oxygen saturation values; outputting a venous oxygen saturation value (SpvO2A) by comparing the generated active-pulse ratio to the arterial calibration curve. - View Dependent Claims (26, 27, 28, 29, 30)
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31. An active-pulse blood analysis method comprising:
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receiving sensor data responsive to optical radiation after attenuation by pulsatile blood flow within the tissue site from an optical sensor that illuminates a tissue site with multiple wavelengths of optical radiation; filtering the sensor data to separate the sensor data into arterial pulse data and active-pulse data; calculating an arterial ratio from the arterial pulse data; calculating an active-pulse ratio from the active-pulse data; outputting an arterial saturation value (SpO2) by comparing the calculated arterial ratio to an arterial calibration curve that relates arterial pulse ratios to oxygen saturation values; outputting a venous oxygen saturation value (SpvO2A) by comparing the generated active-pulse ratio to the arterial calibration curve.
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32. An active-pulse blood analysis method comprising:
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inputting optical sensor data; filtering the optical sensor data into arterial pulse data at a lower range of frequencies and active pulse data at a higher range of frequencies; calculating arterial pulse ratios from the arterial pulse data; calculating active pulse ratios from the active pulse data; applying an arterial calibration curve stored in one or more memory devices to the arterial pulse ratios so as to generate an SpO2 parameter indicative of arterial oxygen saturation; and applying the arterial calibration curve stored in the one or more memory devices to the active pulse ratios so as to generate an SpvO2A parameter indicative of venous oxygen saturation. - View Dependent Claims (33, 34)
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Specification