A sterile, nonimplantable, rigid tube intended to be surgically inserted through the skull to access the brain (e.g., cerebral ventricles) for cerebrospinal fluid (CSF) drainage, infusion of materials, and/or for use as a port through which instruments, leads and/or probes can be passed to perform a variety of diagnostic, treatment, or surgical procedures. It is usually made of metal (e.g., stainless steel) and may include a stylet/trocar blade. This is a single-use device.