Implantable head mounted neurostimulation system for head pain

A implantable neurostimulator for subcutaneous implantation in a position posterior and cephalad to a pinna and between an outer surface of the skull and overlying skin, where the outer surface of the skull has curved contour having a first tangential plane at a first point and a second tangential plane at a second point, comprising:

• an implantable pulse generator (IPG), the IPG including a metal housing defining a housing interior volume, the housing having a major top surface and a shape that divides the housing into a first housing portion and a second housing portion, the housing interior volume including a first interior region within the first housing portion and a second interior region within the second housing portion, wherein:
• the first housing portion contains within the first interior region an integrated circuit for generating stimulating signals, the integrated circuit being fabricated on a planar substrate, wherein the planar substrate corresponds to a first plane of the IPG,
• the second housing portion contains within the second interior region a coil for inductively receiving power, the coil having a generally planar coil loop corresponding to a second plane, wherein the first housing portion is adjacent and non-overlapping the second housing portion, when viewed from a top side of the IPG toward the major top surface, the coil in the second housing portion being interfaced with the integrated circuitry in the first housing portion;
• wherein, when the IPG is implanted in the position over the skull, the first plane associated with the first housing portion is generally parallel to the first tangential plane of the outer surface of the skull and the second plane associated with the second housing portion is generally parallel to the second tangential plane of the outer surface of the skull to generally conform to the curvature of the skull;
• a battery for being charged inductive power received by the coil;
• a first lead having a first lead body interfaced with the integrated circuit in the first housing portion on a proximal end and having a first array of electrodes exposed to the exterior of the first lead body proximate a distal end thereof, each of the electrodes conductively and separately interfaced to the circuitry in the first housing portion through the first lead body to receive stimulating signals therefrom;
• a second lead having a second lead body interfaced with the circuitry in the first housing portion on a proximal end and having a second array of electrodes exposed to the exterior of the second lead body proximate a distal end thereof, each of the electrodes conductively and separately interfaced to the circuitry in the first housing portion through the second lead body to receive stimulating signals therefrom;
• and
• a coating disposed over the first and second housing portions and at least a portion of the first and second leads on the proximal ends thereof to form a unibody construction;
• wherein the circuitry in the first housing portion is operable to drive the first and second arrays simultaneously, so that select ones of the electrodes can be driven to provide stimulating signals;
• and
• wherein the electrodes in each of the first and second arrays are programmed to function as anodes and cathodes.