DISK ELECTRODE FOR ELECTROENCEPHALOGRAPHY

摘要

PURPOSE:To accurately and sharply record a brain wave, by incorporating a buffer amplifier in a disk electrode and setting input impedance high while setting output impedance low. CONSTITUTION:An electrode main body 1 is fixed in an annular side frame 2 and the leading end of the multicore cable 5 connected to an electronic circuit 4 is connected. The non-inversion input side (+) of an operational amplifier 4a is connected to one of the input terminals connected to the electrode main body 1 of the electronic circuit 4 and the inversion input side (-) thereof is connected to the signal wire 5a in the multicore cable 5 to be negatively fed back. Further, power source wires 5b (+), (-) are connected to the amplifier 4a and adhered and mounted to the scalp through an electrode paste 7 before use. Since a bioelectric signal is received at high resistance by the electronic circuit 4 and sent out at low resistance, the bioelectric signal can be accurately measured even when shaking is generated in the signal wire between the electrode and an electrode input box.