Master thesis by Thomas Höller, electrical engineer
For the treatment of many diseases, such as COPD, sleep apnea, diabetes, obesity or Covid-19, the assessment of respiratory function is essential. The oxygen saturation of the patient is one of the most important measurements. For this reason, measurements with a pulse oximeter in an inpatient environment are now routine. However, in the outpatient sector, i.e. in the daily life of the patients, the measurement of oxygen saturation is only carried out relatively rarely. One of the main reasons for this are the currently available devices, which restrict the wearer’s freedom of movement and are sensitive to disturbing influences from everyday life, such as limb movements, local hypothermia or unfavorable lighting conditions. An alternative with great potential, however, is the measurement of oxygen saturation in the ear canal. There the mentioned interferences lose massively in importance. In my master thesis I therefore dealt with the question whether a reliable and continuous measurement of oxygen saturation with an in-ear system based on the cosinuss° One is possible.