Towards an adaptive modified quasi-tripole amplifier configuration for EMG neutralization in neural recording tripoles

Recording neural information using implanted cuff electrodes in a tripolar arrangement is affected by myoelectric interference present at the implantation site. The performance of the recently proposed mQT was suboptimal in that tuning was required to compensate for such interference. In this work we present an improvement where interference in the mQT is removed by modeling the impedance profile of our electrodes. Simulation data show that by employing this “adaptive” approach, a 33% imbalance in the axial resistances when the interference is of 10 mV at 500 Hz and 10 kHz, results in an interference breakthrough that is about 7230 and 100 times less, respectively, at the amplifier´s output.