US Patent 7899547 Level-dependent stimulation methods and systems

An exemplary method includes an implantable stimulator simultaneously applying stimulation current to a stimulation site within a patient via at least one stimulating electrode and compensating current via one or more additional electrodes of opposite polarity as the at least one stimulating electrode and dynamically adjusting the simultaneously applied compensating current as a function of a stimulation level of the stimulation current by increasing a stimulation level of the compensating current if the stimulation level of the stimulation current decreases and decreasing the stimulation level of the compensating current if the stimulation level of the stimulation current increases. Corresponding methods and systems are also disclosed.