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.
The principal aim of foetal monitoring during labor is early detection of hypoxia. Current methods are unable to accomplish this task. Pulse oximetry permits continuous measurement of oxygen saturation and is the best method to detect early hypoxia. In this report, an optical scalp electrode is presented, which permits continuous monitoring of foetal oxygen saturation during labor.
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