intra-abdominal catheter is tunneled to the vertebral canal and threaded to the intradural space.

The catheter is inserted into the intrathecal space; intraspinal location, inside the dura and outside the spinal cord. This allows optimal location for delivery of baclofen. This avoids blood brain barrier reducing absortpion or penetration to the central nervous system - there is now a direct delivery to the site of action intraspinal gaba receptors. There is now possible a more effective response at a lower concentration.