O'Banion & Ritchey LLP
Electrical charge balancing method and apparatus for functional stimulation using precision pulse width compensation
An apparatus and method for electrical charge balancing when generating a stimulus during functional neural stimulation is presented. A stimulus pulse is generated (cathodic or anodic), and after a selected delay a charge compensating pulse is generated of an opposite polarity. The electrode circuit discontinuously examines electrode voltage after termination of the stimulus pulse, and utilizes this voltage to determine how long to extend the width of the charge compensating pulse. The electrode circuit thus performs accurate electrical charge cancellation to remove residual charges from the electrode by precisely controlling pulse width for an opposing polarity compensating pulse that need not have the same current level as the stimulus pulse.
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
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Kuanfu Wentai Richard Yi-Kai
Chen Liu Hill Lo