A Simple Constant-Current Neural Stimulator With Accurate Pulse-Amplitude Control
Abstract
A simple constant-current electrocutaneous stimulator for high-impedance loads using low-cost, standard high-voltage Components is presented. A voltage-regulator powers an oscillator built across the primary of a transformer whose secondary delivers, after rectification, the high-voltage supply to switched current-mirrors in the driving stage. Since the compliance high-voltage is proportional to the stimulation current, overall power consumption is minimized. By adjusting the regulated voltage, control of the pulsed-current amplitude is achieved. A prototype with readily available components features stimulation currents of amplitude and pulsewidth. Pulse-repetition spans from 1 Hz to 10 Hz. Worst-case ripple is 3.7% I(skin)=1 mA. Measured pulse fall-time is shorter than 32 microns. Overall consumption is 4.4W I(skin)=20 mA. Subject isolation from power line is 4KV.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 25, 2001
- Accession Number
- ADA410000
Entities
People
- A. S. Cordeiro
- J. A. Delima
Organizations
- São Paulo State University