This will be a pilot study conducted at Akron Children's Hospital. A maximum of 40 patients with severe traumatic brain injury (TBI) or neurological conditions requiring ICP monitoring will be studied over 2 years. All patients treated with either surgical ICP monitor (external ventricular drain [EVD] or subarachnoid manometer [Bolt]) are eligible for study enrollment. The HS-1000 device will be deployed as soon as possible after surgical ICP monitor placement to record and collect data in parallel with the surgical device.