An external ventricular drain (EVD) is a device used in neurosurgery to relieve intracranial pressure (ICP) resulting from a disturbance in cerebrospinal fluid (CSF) drainage due to tumors, cysts, bleeding, infection, hydrocephalus, and trauma. Current EVD’s consist of a catheter inserted into the ventricle, a collection bag and tubing manually leveled with the ventricle in such a way, as to produce the desired ICP through a hydrostatic column. EVD position with respect to the patient must be closely monitored to avoid over-drainage and underdrainage of the CSF. Over-drainage can result in irreversible damage to the brain in a matter of a few seconds. It can result in a collapse of the brain away from the inner surface of the skull, with the risk of bleeding.