Apparatus and method for cerebral microdialysis to treat neurological disease, including Alzheimer's, Parkinson's or multiple sclerosis

An apparatus for performing cerebral micro-dialysis to treat neurological disease of a patient's brain comprising:

• a catheter for implantation in or near the patient's brain;
• an implantable first pump communicated with the catheter configured to transport cerebrospinal fluid (CSF) from the patient, which CSF contains diseased cells or biomolecules associated with the neurological disease;
• an implantable separation device communicated with the first pump wherein the diseased cells or biomolecules are removed, where the separation apparatus includes a dialysis membrane impregnated with an antibody, a reversible electrostatic filter, and/or a magnetic field effect fractionation chamber wherein a magnetically-tagged antibody scavenges and aids in the removal of circulating diseased cells or biomolecules from the CSF;
• and
• an implantable second pump communicated with a drug reservoir and with the catheter configured to transport CSF and a medication to the patient.