Pulse Oximeter for Low SpO₂ Level Detection Using Discrete Time Signal Processing Algorithm

Oximeter is an important clinical device used for measuring peripheral capillary oxygen saturation (SpO₂) in blood and hence accurate results are needed in order to help physicians predict clinical problems in the initial stage(s) of liver or kidney diagnosis. Different issues associated with the accuracy of SpO₂ and heart rate measurement accuracy are studied in this work. With the understanding of these issues, a new SpO₂ monitoring system is proposed that comprises of a better detection method, novel discrete time signal processing (DTSP) algorithm, and a custom-made oximeter probe head. The proposed SpO₂ measurement system is capable of determining low levels of SpO₂ present in human blood and produce the results in a short time that enable real-time monitoring of a patient SpO₂. It can also distinguish low level of SpO₂ against background noise.