Patent ID: 8718756

Claim:
An apparatus for applying a therapeutic electric field to a target region, the apparatus comprising: a first pair of insulated electrodes, each electrode having a conductor and a surface configured for placement against a patient's body that is insulated from the conductor; a second pair of insulated electrodes, each electrode having a conductor and a surface configured for placement against a patient's body that is insulated from the conductor; a signal generator that generates a periodic control signal with first and second output states, the first and second output states each having a duration between 20 and 500 ms; an AC signal generator that generates a first AC signal across the conductors of the first pair of electrodes when the control signal is in the first output state and generates a second AC signal across the conductors of the second pair of electrodes when the control signal is in the second output state, the first and second AC signals having a frequency between 50 and 500 kHz.