Design of a low-power consumption wearable reflectance pulse oximetry for ubiquitous healthcare system

This paper describes the designation of a real-time, wearable reflectance pulse oximetry based on a wireless sensor network. In order to monitor human physiological signals continuously, wearable reflectance pulse oximetry is built in wrist form that could used to obtain oxygen saturation of a patient unobtrusively. The wearable reflectance pulse oximetry consists of reflectance probe, SpO₂ module and wireless sensor node. The reflectance probe is designed to collaborate with LEDs with wavelengths of 660 nm and 940 nm. SpO₂ module is designed to manage almost of all of the internal processing (e.g. analog signal processing, signal collection and calibration, etc). It is based on a low-power 8 bit ATmega128L microcontroller that operates in 3 V. Low-power processing SpO₂ module was integrated on wireless sensor node for wireless communication. The oxygen saturation collected from wireless sensor node was transmitted wirelessly to a base-station for storage and display purposes. This paper focused on the successful integration of all these components into wearable reflectance pulse oximetry and performed its ability to measure patientpsila oxygen saturation for ubiquitous healthcare system.