For purposes of validation, this study compares intracranial pressure measurements obtained with a novel self-calibrating, non-invasive, intracranial pressure measuring (ICP) device, with the values obtained from (a) patients in an intensive care unit (ICU) whose meet standard clinical indications for ICP measurement and whose ICP is measured using gold-standard implanted intracranial instrumentation and in (b) ambulatory subjects who meet clinical indications for lumbar puncture.
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Non-invasive intracranial pressure (ICP) value
Timeframe: Up to 5 days after admission to ICU
Second non-invasive intracranial pressure (ICP) value
Timeframe: Up to 6 days after admission to ICU