An implantable stimulator includes a tube assembly that is configured to house a number of components that are configured to apply at least one stimulus to at least one stimulation site within a patient. The tube assembly has a shape that allows the stimulator to be implanted within said patient in a pre-determined orientation. Exemplary methods of stimulating a stimulation site within a patient include applying an electrical stimulation current to a stimulation site via one or more electrodes extending along one or more sides of a stimulator. The stimulator has a shape allowing the stimulator to be implanted within the patient in a pre-determined orientation.
