Inter alia , there is disclosed an implantable device characterized in that it comprises: an implantable electrode carrier having an outer surface including a plurality of electrode contacts for electrically stimulating nearby neural tissue； an enlarged fluid storage reservoir within the electrode carrier for storing a treatment volume of therapeutic fluid for an extended therapeutic treatment period； and at least one fluid delivery port connecting the fluid storage reservoir to the outer surface of the electrode carrier for delivering the therapeutic fluid from the fluid storage reservoir to the outer surface.
