Active-pulse blood analysis system
First Claim
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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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.
921 Citations
20 Claims
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1. 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 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, and select 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 determined from an arterial pulse; applying an active pulse calibration curve stored in one or more memory devices to the arterial pulse ratios so as to generate an SpO2AP parameter indicative of arterial oxygen saturation determined from an active pulse; and choosing between the SpO2 parameter and the SpO2AP parameter so as to generate an SpO2M output parameter, the SpO2M output parameter comprising either the SpO2 parameter or the SpO2AP parameter, based on signal conditions. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An active-pulse blood analysis apparatus comprising:
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an optical sensor means for transmitting multiple wavelengths of light into a tissue site and detecting the transmitted light after attenuation by arterial blood flow and active pulsed blood flow within the tissue site so as to generate plethysmograph data; a filter means for separating the detected plethysmograph data into arterial pulse data and active pulse data; a processor means for calculating an arterial pulse ratio from the arterial pulse data and an active pulse ratio from the active pulse data; a means for storing; an arterial calibration curve means for relating arterial pulse ratios to oxygen saturation values (SpO2); and an active pulse calibration curve means for relating active pulse ratios to active pulse oxygen saturation values (SpO2AP); a means for selecting; an oxygen saturation value (SpO2) from the arterial calibration curve means based on the arterial pulse ratio; and an active pulse oxygen saturation value (SpO2AP) from the active pulse calibration curve means based on the active pulse ratio; and a means for selecting either the oxygen saturation value (SpO2) or the active pulse oxygen saturation value (SpO2AP) as an oxygen saturation value (SpO2M) based on signal conditions. - View Dependent Claims (19, 20)
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Specification