A sterile implantable device intended to divert excessive cerebrospinal fluid (CSF) from the ventricles (fluid-filled cavities) of the brain to either the peritoneal cavity or the right atrium (i.e., dual-capability) where it can be absorbed into the body. It typically consists of a ventricular catheter, a mechanical shunt valve, and a distal catheter(s) that channels the CSF to the peritoneal cavity or right atrium. This device is intended as a therapeutic measure for situations where increased CSF causes increased intracranial pressure (hydrocephalus). Disposable devices associated with implantation may be included.