A system for treating a disorder of a central nervous system (CNS) comprises first and second conduits, distal ends of which are open to a patients cerebrospinal fluid (CSF). A proximal end of the second conduit opens to drain CSF from the CNS. A first implantable reservoir holds a first material to be introduced to the CNS. An intracranial pressure detecting unit includes a transmitter for providing auditory signals to the patient and a BAUR analyzer for analyzing brainstem evoked auditory potentials to determine current intracranial pressure. A pump is coupled to the first reservoir and introduces the first material to the CNS via the first conduit. A brain activity detection unit delects and analyzes brain activity of the patient and controls drainage of CSF based on input from the intracranial pressure detecting unit to maintain intracranial pressure within a predetermined range.
