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Active-pulse blood analysis system

  • US 9,724,025 B1
  • Filed: 07/10/2014
  • Issued: 08/08/2017
  • Est. Priority Date: 01/16/2013
  • Status: Active Grant
First Claim
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1. An active-pulse blood analysis system comprising:

  • an optical sensor that illuminates a tissue site with multiple wavelengths of optical radiation and that outputs sensor signals responsive to the optical radiation after attenuation by pulsatile blood flow within the tissue site;

    a monitor that 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 an arterial pulse ratio and an active pulse ratio according to the wavelengths;

    one or more memory devices storing an arterial calibration curve that relates arterial pulse ratios to arterial oxygen saturation values (SpO2);

    one or more memory devices storing an active pulse calibration curve that relates active pulse ratios to arterial oxygen saturation values (SpO2AP);

    one or more processors configured to;

    select a first arterial oxygen saturation value (SpO2) from the arterial calibration curve based on the arterial pulse ratio generated by the monitor, andselect a second arterial oxygen saturation value (SpO2AP) from the active pulse calibration curve based on the active pulse ratio generated by the monitor; and

    a selection module that outputs a third arterial oxygen saturation value (SpO2M) selected from one of the first arterial oxygen saturation value (SpO2) and the second arterial oxygen saturation value (SpO2AP) based on signal conditions.

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