Development of Improved Capacitive Electrodes for Electrocardiographic Monitoring

摘要

The work culminated in the development of an operational prototype capacitive electrode which consists of a self-contained preamplifier and a thin-film coupling capacitor and which, although not designed for clinical use, could be used to obtain physiological electrocardiographic (ECG) signals. The thin-film coupling capacitor is made of Mylar (TM) and can be easily replaced if it should become damaged. This is an important feature of this improved capacitive electrode. Other previous designs involved coupling films that were integral portions of the entire electrode package, thus, when the thin coupling film became damaged, the entire electrode had to be replaced. The integral preamplifier required dc power, so a battery box was provided with each set of monitoring electrodes. A coupling filter for each electrode was included in each battery box to provide controlled shaping of the frequency response characteristics of each electrode. (Author)