Rozhraní biomedicínských aplikací

Abstract

With the expansion of mobile technology in medicine there is currently an effort to create a reliable mobile ECG monitoring system. In order for this system to be accurate, it is necessary to eliminate interference or at least minimize it. Precise hardware design and signal processing quality are prerequisites. This work describes the development of a new type of capacitive electrodes, where a simple design innovation was able to increase the quality of transmitted ECG signal. Unfortunately, along with relevant ECG signal is also always transmitted the movement of the wearer and thus the motion artifacts which are the main problem of mobile monitors. There is a large number of works dealing with the detection and elimination of these artifacts. However, so far there is no method developed which reliably and completely eliminate motion artifacts, especially because the frequency spectrum of ECG signal and motion artifacts overlap and thus it is very difficult, if not impossible to separate these two components. In this work is described a new approach to solve this problem. It is a prototype of measuring device that allows simultaneous recording of ECG and VCG (vectorcardiograph). This makes possible to compare these records and decide which one is superior in terms of motion artifacts. This is performed by a new comparator i.e. algorithm that automatically evaluates and performs the selection of better quality lead almost in real time. New capacitive electrodes and the comparator are therefore suitable for use in mobile ECG monitor.