Electrodes

Claim 1

IN A SYSTEM FOR DERIVING SIGNALS IN RESPONSE TO VOLTAGES GENERATED BY THE MUSCLES OF A HUMAN OR ANIMAL SUBJECT WITHOUT DERIVING SIGNIFICANT NOISE WHEN THE SUBJECT IS MOVING, AN ELECTRODE UNIT HAVING A CUP COMPOSED ENTIRELY OF ELECTRICALLY INSULATING MATERIAL, SAID CUP INCLUDING A SUBSTANTIALLY PLANAR RIM ADAPTED TO BE SECURED TO THE SKIN OF SAID SUBJECT, SAID RIM DEFINING THE MOUTH OF SAID CUP, AN AMPLIFIER ELECTRICALLY CONNECTED TO BE RESPONSIVE TO THE SIGNAL PICKED UP BY SAID ELECTRODE UNIT, THE IMPROVEMENT IN SAID UNIT COMPRISING: A SIGNLE ELECTRODE MOUNTED WITHIN SAID CUP AND COMPLETELY REMOVED FROM ITS MOUTH, AN ELECTROLYTE COMPLETELY FILLING THE VOLUME OF SAID CUP SO THAT THE ONLY SIGNAL PATH BETWEEN THE SKIN OF THE SUBJECT AND SAID ELECTRODE IS THROUGH SAID ELECTROLYTE AND THE RESISTANCE OF SAID PATH REMAINS SUBSTANTIALLY CONSTANT DESPITE MOVEMENT OF SAID SUBJECT.