Selection of ensemble averaging weights for a pulse oximeter based on signal quality metrics
AssigneeNellcor Puritan Bennett LLC
InventorClark R. Baker, Jr.
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Abstract
A method and a system for ensemble averaging signals in a pulse oximeter, including receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light, obtaining an assessment of the signal quality of the electromagnetic signals, selecting weights for an ensemble averager using the assessment of signal quality, and ensemble averaging the electromagnetic signals using the ensemble averager.
Claims20
A method of ensemble averaging signals in a pulse oximetry system, comprising:
- receiving, via a sensor, first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light;
- and
- using an oximeter,
- obtaining an assessment of the signal quality of the electromagnetic signals;
- calculating weights for an ensemble averager from a continuous weighting function based at least in part upon the assessment of signal quality;
- and
- ensemble averaging the electromagnetic signals using the ensemble averager.
A pulse oximetry system, comprising:
- a sensor configured to receive first and second electromagnetic signals from a blood perfused tissue portion corresponding to two different wavelengths of light;
- and
- a pulse oximeter configured to:
- obtain an assessment of a signal quality of the first and second electromagnetic signals;
- calculate a first weight associated with the first and second electromagnetic signals for an oxygen saturation ensemble averager and/or calculate a second weight associated with the first and second electromagnetic signals for a pulse rate ensemble averager using at least one continuously variable weighting function based at least in part upon the assessment of the signal quality;
- and
- calculate an oxygen saturation value with an oxygen saturation averager based on the first weight and the first and second electromagnetic signals and/or calculate a pulse rate value with the pulse rate ensemble averager based at least in part upon the second weight and the first and second electromagnetic signals.
A pulse oximetry system, comprising:
- a sensor configured to receive first and second electromagnetic signals from a blood perfused tissue portion corresponding to two different wavelengths of light;
- and
- a pulse oximeter configured to:
- obtain an assessment of a signal quality of the first and second electromagnetic signals, wherein the assessment comprises a determination of whether arrhythmia is present;
- calculate a weight associated with the first and second electromagnetic signals for an ensemble averager using at least one continuously variable weighting function based at least in part upon the assessment of the signal quality;
- and
- calculate an oxygen saturation value with the ensemble averager based at least in part upon the determination of whether arrhythmia is present, the weight, and the first and second electromagnetic signals.
Dependencies are inferred from the claim text.