Telemetry based system for measurement and monitoring of biomedical signals

The paper presents design and implementation of a telemetry system for measurement and monitoring of bioelectric signals such as EEG, ECG or EMG. The proposed system consists of two parts, a portable part and a stationary part. The transmitter uses a pair of 2.8v lithium D cell batteries and can operate for 1.5 months before replacement. The stationary part consists of a commercial radio receiver. The signals can be plotted (using x-y plotter), displayed (using a conventional analogue CRT), or sent to PC system for further processing and interpretation. The design details of the circuits are presented together with the essential operational software of the system. The performance of the proposed system is practically assessed. This is achieved by connecting the patient´s body to the system through bipolar surface electrodes. The bioelectric signals are successfully picked up within the range of the used electrodes.