When ST-gel is used for biomedical electrodes, depending on applications, it can control electric conductivity for highly precise monitoring electrodes for ECG requiring transmission of very low electric signals, as well as electrodes for electric therapeutic machines, requiring control of quantity of electricity given to the skin by constant transmission of electric signals.
Example of ST-gel used for ECG electrode
Structure and electric performance of ST-gel
Generally, ion-conducting materials transmit electric signals as free electrons by combination with electrode elements. However, conventional products have the disadvantages of contact impedance increasing due to electric repulsion at the interface with the electrode element material as well as having higher impedance of their own. ST-gel minimizes such electric repulsion and thus can precisely transmit weak signals.
Polymer matrix image
Characteristics of electrodes for electro-cardiography (according to AAMI Disposable ECG electrodes)
AAMI (Association for the Advancement of Medical Instrumentation) standards
Electrode for ECG using ST-gel
Voltage across electrode pair (mV)
100 or less
0.5
Impedance across electrode pair (Ω)
2000 or less
150
Defibrillation-resistance of electrode 5-sec (mV)
100 or less
15
* The above data shows an example of the measured values on the monitoring electrode with adhesive framework.
