The Cerebrospinal Fluid (CSF) Physiologic Controller is an implantable active battery−operated device that is microprocessor controlled via algorithms stored in its memory. It is a multi mode drainage system that contains at least two flow paths : a low resistance flow path for when the patient is in the supine or substantially supine position and a flow path containing a programmable variable check valve to prevent over−drainage when the patient is in the upright or substantially upright position.
