The primary objective of this study is to test the hypothesis that direct dorsal column stimulation is safe in the treatment of medically refractory, chronic neuropathic pain. The study will examine the feasibility of Direct Dorsal Column Stimulation using existing Stimulation Leads (Ad-Tech). Secondary endpoints will include pain relief, somatosensory evoked potentials (SSEPs), stimulator settings required, improvement in quality of life and use of pain medications.