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Numerous IoT based systems are in deployment in the healthcare industry in order to monitor and diagnose the current state and to facilitate the wellbeing of a patient in an autonomous way. Increasing global populations in need of care, abundance of low cost powerful smart devices, enormous progress of communication technologies and emergence of robust data analytics have influenced the upsurge of IoT based healthcare systems. However, the reliability and durability of biosignals sensors and devices play vital roles towards establishing an ideal IoT healthcare system. Biosignals that originate due to the alterations of cell membrane potentials, carry important underlying physiological information. Any variations in them from the normal patterns can help diagnose abnormalities in the human body. Hence, to acquire these biosignals special bio-compatible electrodes, amplifiers, safety and isolation circuitry and measurement techniques are required due to their characteristic features like low amplitude, bandwidth and susceptibility to noise. Furthermore, to ensure ubiquitous and reliable data availability, acquired data signals need to be digitized, filtered and processed for the extraction of underlying events and features. All the relevant things are discussed in this chapter in a view to relate their significance in healthcare IoT services and applications. Overall, the chapter provides the fundamental information regarding the most important physiological data for the development of a ubiquitous IoT healthcare system that can ensure more accurate diagnosis, real-time evidence based treatment, lower hospital visits, and optimal utilization of resources. |
