Parallel alarm processor
First Claim
1. A parallel alarm processor comprising:
- a sensor signal responsive to multiple wavelengths of light transmitted into a tissue site and detected after attenuation by pulsatile blood flow within the tissue site;
a first processor having an input responsive to the sensor signal and a smoothing output responsive to relatively long duration oxygen desaturations;
a second processor having an input responsive to the sensor signal and a predictor output responsive to relatively short duration, intermittent oxygen desaturations;
a threshold detector responsive to the smoothing output so as to generate a first alarm when the smoothing output crosses a predetermined threshold; and
a pattern processor responsive to the predictor output so as to generate a second alarm when a predetermined pattern is detected in a series of oxygen desaturations.
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Accused Products
Abstract
A parallel alarm processor has a threshold detector, a pattern extractor, a predetermined reference pattern, a first alarm and a second alarm. The threshold detector has a first output responsive to relatively long duration oxygen desaturations. The pattern extractor has a second output responsive to relatively short duration oxygen desaturations. The predetermined reference pattern is indicative of a series of intermittent oxygen desaturations. A first alarm is triggered when the first output crosses a lower limit threshold. A second alarm is triggered when the second output matches the predetermined reference pattern. In an embodiment, an integrator inputs smoothed oxygen saturation measurements to the threshold detector, and a predictor inputs predictive oxygen saturation measurements to the pattern extractor.
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Citations
9 Claims
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1. A parallel alarm processor comprising:
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a sensor signal responsive to multiple wavelengths of light transmitted into a tissue site and detected after attenuation by pulsatile blood flow within the tissue site; a first processor having an input responsive to the sensor signal and a smoothing output responsive to relatively long duration oxygen desaturations; a second processor having an input responsive to the sensor signal and a predictor output responsive to relatively short duration, intermittent oxygen desaturations; a threshold detector responsive to the smoothing output so as to generate a first alarm when the smoothing output crosses a predetermined threshold; and a pattern processor responsive to the predictor output so as to generate a second alarm when a predetermined pattern is detected in a series of oxygen desaturations. - View Dependent Claims (2, 3)
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4. A parallel alarm processor method comprising:
- transmitting light having multiple wavelengths into a patient tissue site;
detecting the light after attenuation by pulsatile arterial blood flow within the tissue site so as to generate a sensor signal; generating a first blood oxygen saturation measurement responsive to the sensor signal and to short duration, intermittent oxygen desaturations of the patient; generating a second smoother blood oxygen saturation measurement responsive to the sensor signal and to long duration oxygen desaturations of the patient; detecting a threshold crossing of the smoother blood oxygen saturation measurement; recognizing a pattern in the first blood oxygen saturation measurement; and triggering a first alarm in response to the recognized pattern and a second alarm in response to the threshold crossing. - View Dependent Claims (5, 6)
- transmitting light having multiple wavelengths into a patient tissue site;
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7. A parallel alarm processor comprising:
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a threshold detector having a first output responsive to relatively long duration oxygen desaturations; a pattern extractor having a second output responsive to relatively short duration oxygen desaturations; a predetermined reference pattern indicative of a series of intermittent oxygen desaturations; a first alarm triggered when the first output crosses a lower limit threshold; and a second alarm triggered when the second output matches the predetermined reference pattern. - View Dependent Claims (8, 9)
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Specification