- Each patient must have an implanted programmable SynchroMed infusion device or a CADD-Micro external programmable infusion device and spinal catheter (hereafter "IT pump and spinal catheter") prior to enrollment into this trial. (If a patient has an external pump, the Investigator must ensure that the patient is at a low risk for infection and that the patient is capable of maintaining good personal hygiene. The Investigator must have demonstrated the ability to successfully manage patients with external pumps prior to enrolling a patient in this trial.)