A Study Evaluate Aqueduct's Smart External Drain

Inclusion Criteria: 1. Stable Neuro - examination on standard EVD assessed as Not Clinically Significant (NCS) by PI or delegated Sub-I prior to study treatment. 2. GCS \> 13 (minimum of E3V5M5) prior to study treatment. 3. Subject must be scheduled to have an EVD placed as part of routine management and for a length of at least 48 hours. (e.g. in the setting of a tumor removal or treatment of hydrocephalus) 4. Age 5-80. 5. Stable Vital Signs - Blood pressure (Systolic and Diastolic), Heart Rate, Respiratory Rate and weight assessed as not clinically significant (NCS) and afebrile as per PI/Sub-assessment. (Stable Vital signs will be re-assessed again prior to treatment with the SED on Day 2) 6. Able to perform and follow simple commands (ex: sit up in bed, lay down in bed) 7. Pre-Study CT/MRI Imaging stable per PI Sub-I Assessment post ventriculostomy. 8. Able to stand 9. Able to obtain consent Exclusion Criteria: 1. Refractory ICP or needing active ICP management 2. Unable to tolerate brief clamping of EVD (\<5min) 3. Unable to follow simple commands 4. Unconscious 5. Anticoagulant Therapy 6. Known bleeding diathesis 7. Scalp Infection 8. In the opinion of the Investigator the subject is not a good study candidate