Implantable head located radiofrequency coupled neurostimulation system for head pain

A system for driving a plurality of implantable neurostimulator leads, each lead having an associated plurality of electrodes disposed in at least one array on the lead, the system comprising:

• at least two implantable pulse generators (IPGs), each IPG including:
• an electrode driver for driving the electrodes associated with the IPG,
• a current limiting current regulator for limiting the current to the IPG,
• a load system for determining a minimum load requirement of the IPG to provide the necessary power to the current regulator,
• an IPG power coupler for receiving power across a dermis layer for interface of the power with the electrode driver of the IPG, and
• an IPG communication system for transmitting the determined minimum load requirement of the IPG across the dermis layer;
• and
• an external unit for providing power to the at least two IPGs, the external unit including:
• an external variable power generator,
• an external power coupler for coupling power across the dermis layer to the IPG power couplers,
• an external communication system for receiving from the IPG communication systems the respective determined minimum load requirements, and
• a controller for varying the power level of the variable power generator as a function of the received determined minimum load requirement of the IPG with the greatest minimum load requirement.