System and method for a non-invasive medical sensor
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Publication Number
US-10485463-B2
Publication Date
2019-11-26
Expiration Date
Abstract
A method and system for measuring oxygen levels and various blood constituents utilizing a sensor having one or more light sources, and one or more light detectors is disclosed. The system is capable of using data collected by the one or more detectors from a non-monochromatic light source to provide accurate information during motion events occurring with an extremity the sensor. The system is also capable of detecting and providing an alert if the sensor is not properly placed on a patient or becomes disengaged therefrom.
Core Innovation
The method for eliminating error in a non-invasive optical sensing system uses first and second detectors with different spectral response curves, periodically emitted non-monochromatic light, and red and infrared light. The system generates oxygen saturation values from monochromatic and non-monochromatic measurements, incorporating an oximeter device with centroid-wavelength measurement and signal analysis. It substitutes the non-monochromatic-light value when the ratio of the detectors' measured red-light centroid wavelengths is outside a threshold.
The system includes a wavelength sensor with two detectors having different spectral responses and a processor that generates oxygen saturation values from red and infrared light and from signals produced by periodically emitted non-monochromatic light. The processor replaces the first oxygen saturation value with the value based on the non-monochromatic-light signals when a ratio of those signals indicates that a motion event has occurred.
Claims Coverage
The claims include two independent claims directed to a method and a system, comprising six inventive features across the independent and dependent claims.
Oxygen saturation substitution based on centroid wavelength
The method claim provides first and second detectors with different spectral response curves, periodically emits non-monochromatic light, and emits red and infrared light. It generates oxygen saturation values based on the red and infrared measurements and on the non-monochromatic light, and substitutes the first value with the second value when the ratio of the measured red-light centroid wavelengths is outside a threshold.
System-based oxygen saturation substitution during a motion event
The system claim combines periodically provided non-monochromatic light, red and infrared light, a wavelength sensor with two detectors having different spectral responses, and a processor. The processor generates oxygen saturation values from the detector signals and from red and infrared light, then substitutes the first value with the second value when a ratio of the detector signals indicates that a motion event has occurred.
Arterial pulse rate data during a motion event
A dependent claim adds generation of arterial pulse rate data from the first and second signals when a motion event occurs with tissue in the non-invasive optical sensor.
Notification based on a signal ratio threshold
A dependent claim adds generation of a notification when the ratio of the first signal to the second signal is above or below a threshold.
Centroid wavelength range check and alert
A dependent claim adds measurement of the emitted red-light centroid wavelength, checking whether it is within a range configured to ensure measurement accuracy, and generating an alert when it is outside the range.
Signal proportional to the red-light centroid wavelength
A dependent claim uses the detectors' different spectral response curves to derive a fourth signal proportional to the emitted red-light centroid wavelength.
The claims cover a method and a system that derive oxygen saturation from monochromatic and non-monochromatic light and substitute values under specified centroid-wavelength or motion-event conditions. Dependent claims add pulse-rate data generation, threshold-based notification, centroid-wavelength checking and alerting, and derivation of a signal proportional to the emitted red-light centroid wavelength.
Stated Advantages
The method is directed to eliminating error when using a non-invasive optical sensing system.
The centroid-wavelength range check is configured to ensure measurement accuracy.
Documented Applications
Non-invasive optical sensing to generate oxygen saturation values from red and infrared light and from non-monochromatic light, including within an oximeter device.
Generation of arterial pulse rate data when a motion event occurs with tissue in the non-invasive optical sensor.
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