Patent ID: 6690974
Filing Date: 2004-02-10
Classification: A61N

Abstract:
A neurostimulation system for treating a disorder in a brain of a patient, comprising:a stimulation subsystem adapted to apply an electrical stimulation signal to neural tissue of the patient; and a plurality of electrodes including a first electrode and a second electrode, each in electrical communication with the stimulation subsystem; wherein the stimulation subsystem includes a stimulation signal generator adapted to deliver a controlled electrical current from a stimulation signal input through a stimulation load between the first electrode and the second electrode; and wherein the stimulation signal generator includes a programmable current digital-to-analog converter in series with the stimulation load; and wherein the programmable current digital-to-analog converter comprises a programmable resistor in series with the stimulation load, a reference voltage source providing a reference voltage, and a current controller adapted to match a voltage at an upstream end of the programmable resistor to the reference voltage.