Study of Occipital Nerve Stimulation for Drug Refractory Migraine

Inclusion Criteria: * Be diagnosed with multiple migraines per month of moderate to severe intensity; * Be refractory to medication; * Be an appropriate candidate for the surgical procedures required fo this study; * Be willing and able to comply with all study related procedures; * Be capable of reading and understanding patient information materials and giving written informed consent. Exclusion Criteria: * Have onset of headache after age 50; * Are current substance abusers (including alcohol and illicit drugs); * Have a significant psychiatric disorder; * Have previously been treated with occipital nerve stimulation (either temporary trial or permanent implant); * Have had nerve stimulation for pain relief. * Have had an injection of botulinum toxin in the head or neck within 6 months prior to enrollment; * Have previously undergone destructive ganglionectomy affecting C2/C3 occipital and/or trigeminal distribution or have an occipital blockade or radiofrequency procedure currently in effect. * Have a condition currently requiring or likely to require the use of MRI or diathermy; * Have an active implantable device; * Are pregnant or lactating or planning to become pregnant in the next 14 months; * Have participated in any drug or device trial in the last 4 weeks or plant to participate in any other study during the next 14 months.