To evaluate the performance characteristics of the Smart External Drain (SED) compared with standard EVD drains in the hospital setting, specifically:

• Number, type and duration of staff interactions.
• Regulating and controlling ICP and CSF drainage.
• Maintaining system control with patient movement.

In this two day clinical trial, subjects will be observed on Day 1 of study during their routine treatment and using their already existing EVD. On Day 2 of study; subjects will be switched to the Smart External Drain for monitoring and management of ICP and CSF

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