 In 1979, Wand et. al. found that small amounts of morphine, when injected into the sub-arachnoid space, had significant affect in reducing pain. Since that time a number of drug products and infusion pumps have been developed to address this condition. The primary drug used for this purpose in preservative-free morphine sulfate solution which is delivered via an implanted intrathecal catheter. The Prometra Intrathecal Pump System is only the second programmable pump to be used in the treatment of chronic pain. 