Method for improved oxygen saturation estimation in the presence of noise

摘要

The present disclosure relates, according to some embodiments, to devices, systems, and methods for estimating a physiological parameter in the presence of noise. For example, the disclosure relates, in some embodiments, to devices, systems, and methods for assessing (e.g., estimating, measuring, calculating) oxygen saturation (SpO2). Methods of assessing SpO2 may include assessing a noise metric associated with motion artifact. In some embodiments, a percentage (e.g., an empirically determined percentage) of a noise metric may be simply added to the SpO2 estimate to produce a corrected SpO2 estimate. An oximetry algorithm may include, according to some embodiments, combining multiple internal SpO2 estimates and associated noise and/or signal quality metrics (e.g., using a radial basis neural network) to produce a modified (e.g., corrected) SpO2 estimate (e.g., rather than merely selecting the estimate from a finite number of candidates). A modified SpO2 estimate may include little or no movement-based error.

主权项

1. A method for estimating oxygen saturation in the presence of noise, the method comprising:
determining a change in estimated oxygen saturation comprising calculating a difference between a first estimated oxygen saturation value at a first time and a second estimated oxygen saturation value at a second time; determining a change in a saturation noise estimate between a first saturation noise estimate at the first time and a second saturation noise estimate at the second time, wherein the change in the saturation noise estimate attends the change in estimated oxygen saturation; selecting either the first estimated oxygen saturation value or the second estimated oxygen saturation value based at least in part on a comparison between the change in the estimated oxygen saturation and the change in the saturation noise estimate; and displaying the selected estimated oxygen saturation value.