An implantable stimulation system includes a pulse generator having at least one implantable lead (200) with a proximal end (301) electrically connected to the pulse generator, and a distal end bearing at least one stimulation electrode (201.1, 201.2) electrically connected to the proximal end (301), and thus to the pulse generator. The distal end of the lead (200) includes at least one expandable member (202) configured to laterally extend from the lead (200) in its expanded state, and that carries the stimulation electrode(s) (201.1, 201.2).
