A low-cost neurostimulator with accurate pulsed-current control

J.A. De Lima, A.S. Cordeiro
2002 IEEE Transactions on Biomedical Engineering  
A constant-current stimulator for high-impedance loads using only low-cost standard high-voltage components is presented. A voltage-regulator powers an oscillator built across the primary of a step-up transformer whose secondary supplies, after rectification, the high voltage to a switched current-mirror in the driving stage. Adjusting the regulated voltage controls the pulsed-current intensity. A prototype produces stimulus of amplitude and pulsewidth within 0 20 mA and 50 s 1 ms,
more » ... 1 ms, respectively. Pulse-repetition spans from 1 Hz to 10 Hz. Worst case ripple is 3.7% at = 1 mA. Overall consumption is 5.6 W at = 20 mA. Index Terms-Current source, current stimulator, electrocutaneous stimulation, high voltage.
doi:10.1109/10.995689 pmid:12002182 fatcat:qg4cvvqxn5gapgjijq76567fji