Patent ID: 9700724
Date: 2017-07-11
CPC Classifications: A61N

Claim:
1. An apparatus for electrical charge balancing when generating functional neural stimulation, comprising: (a) one or more stimulus electrodes; (b) a stimulation pulse generation circuit having a current sink and a current source, with said stimulation pulse generation circuit configured for directly driving current waveforms, without passing through a blocking capacitor, as a bi-phasic stimulus having both a cathodic and anodic phase through a single stimulus electrode within said one or more stimulus electrodes; (c) a switching circuit configured for sampling electrode voltage from each said stimulus electrode when each bi-phasic stimulus terminates with residual voltage sampled before the next stimulus pulse begins; (d) a feedback sensor coupled to said switching circuit for generating triggering signals in response to comparing electrode voltage sampled by said switching circuit with a reference; and (e) a digital control circuit coupled to said switching circuit and configured for receiving said feedback sensor triggering signals from said feedback sensor, said digital control circuit is configured for performing steps comprising: