Publicação: A low-cost neurostimulator with accurate pulsed-current control
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2002-05-01
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Institute of Electrical and Electronics Engineers (IEEE)
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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 less than or equal to I-skin less than or equal to 20 mA and 50 mus less than or equal to T-pulse less than or equal to 1 ms, respectively. Pulse-repetition spans from 1 Hz to 10 Hz. Worst case ripple is 3.7% at I-skin = 1 mA. Overall consumption is 5.6 W at I-skin = 20 mA.
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IEEE Transactions on Biomedical Engineering. New York: IEEE-Inst Electrical Electronics Engineers Inc., v. 49, n. 5, p. 497-500, 2002.
