The present invention is directed to an electrode for use in measuring low level signals amidst competing noise signals. The electrode includes an electrically non-conductive substrate having a closed loop of electrical conductive and adhesive material carried by the substrate which defines therein an...http://www.google.es/patents/US5237995?utm_source=gb-gplus-sharePatente US5237995 - Concentric electrode for use in detecting low level bioelectric signals
Concentric electrode for use in detecting low level bioelectric signals
