Abstract
Pulse oximeters are measuring the oxygen level of the arterial blood with a non-invasive method. The paper introduces the working principles and the build-up of modern pulse oximeters. The construction steps of a new kind of diagnostic tool, the wireless fetal pulse oximeter will be described also. Eliminating the catheter from the fetal blood oxygen monitoring system gives the possibility of free movement to the mother in labor. Furthermore, the uncomfortable feeling caused by the catheter can be reduced with this wireless device. With these advantages the wireless fetal pulse oximeter is a promising diagnostic tool for the labor rooms in the future. The radio range, the operation time, and the waterproof capability of the sealing of the prototype were examined in the paper.
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