Methods and systems for determining a probe-off condition in a medical device
First Claim
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1. A method for determining whether a pulse oximetry sensor is properly positioned on a subject, the method comprising:
- receiving a detected light signal using the pulse oximetry sensor;
processing, using a pulse oximeter, the light signal to obtain a first signal corresponding to ambient light;
processing, using the pulse oximeter, the light signal to obtain a second signal corresponding to an emitted photonic signal and ambient light;
identifying, using the pulse oximeter, an inverse effect based on the first signal and the second signal, wherein the inverse effect corresponds to when two signals change inversely with respect to each other, wherein identifying the inverse effect comprises;
determining a difference signal by subtracting the first signal from the second signal;
determining a weight based on the first signal and the difference signal;
determining a count based on the first signal and the difference signal;
determining a metric based on the weight and the count; and
comparing the metric to a threshold; and
determining, using the pulse oximeter, that the pulse oximetry sensor is not properly positioned based on the identification of an inverse effect.
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Abstract
A physiological monitoring system may determine a probe-off condition. A physiological sensor may receive a light signal including one or more wavelengths of light. The received light signal may be processed to obtain a light signal corresponding to an ambient light signal and a light signal corresponding to an emitted light signal and the ambient light signal. The signals may be analyzed to identify an inverse effect. The system may determine whether the physiological sensor is properly positioned based on the identification of an inverse effect.
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Citations
12 Claims
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1. A method for determining whether a pulse oximetry sensor is properly positioned on a subject, the method comprising:
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receiving a detected light signal using the pulse oximetry sensor; processing, using a pulse oximeter, the light signal to obtain a first signal corresponding to ambient light; processing, using the pulse oximeter, the light signal to obtain a second signal corresponding to an emitted photonic signal and ambient light; identifying, using the pulse oximeter, an inverse effect based on the first signal and the second signal, wherein the inverse effect corresponds to when two signals change inversely with respect to each other, wherein identifying the inverse effect comprises; determining a difference signal by subtracting the first signal from the second signal; determining a weight based on the first signal and the difference signal; determining a count based on the first signal and the difference signal; determining a metric based on the weight and the count; and comparing the metric to a threshold; and determining, using the pulse oximeter, that the pulse oximetry sensor is not properly positioned based on the identification of an inverse effect. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for determining whether a pulse oximetry sensor is properly positioned on a subject, the system comprising:
a pulse oximeter configured to; receive a detected light signal using the pulse oximetry sensor; process the light signal to obtain a first signal corresponding to ambient light; process the light signal to obtain a second signal corresponding to an emitted photonic signal and ambient light; determine a difference signal by subtracting the first signal from the second signal; determine a weight based on the first signal and the difference signal; determine a count based on the first signal and the difference signal; determine a metric based on the weight and the count; compare the metric to a threshold; identify an inverse effect based on the first signal and the second signal, wherein the inverse effect corresponds to when two signals change inversely with respect to each other; and determine that the pulse oximetry sensor is not properly positioned based on the identification of an inverse effect. - View Dependent Claims (8, 9, 10, 11, 12)
Specification