Pulse oximetry is a valuable monitoring technology used at present mainly for immobile patients. The reason for the limitation concerning the user's mobility is due principally to unsuitable sensors and sensor locations. This is particularly the case with finger sensors, which tend to work best in respect to signal quality i.e. modulation depth, but are quite susceptible to motion artifacts. In order to achieve mobility for pulse oximetry monitoring, an ear canal sensor was developed. This area was chosen based on the assumption that intensive movement and acceleration of this part of the body is generally avoided as it produces unpleasant feelings.
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