Wireless skin sensor aims to detect silent shunt failures

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Existing ventricular cerebrospinal fluid (CSF) shunt. * Region of intact skin overlying an unambiguously identifiable, palpable, chronically indwelling ventricular shunt crossing the clavicle and appropriate in size for application of the study device. * Written informed consent provided by the participant or, when applicable, by a parent, legal guardian, health care agent, or surrogate decision maker according to local regulations. For participants with planned "virtual off" measurements: -Existing ventricular CSF shunt with a programmable valve that has an available manufacturer-reported "virtual off" setting and can be programmed noninvasively. For participants whose valve will be adjusted to the "virtual off" setting during the study: -Subject-reported or documented history of successful shunt valve adjustment(s). Exclusion Criteria: * Presence of more than one distal shunt catheter in the study device measurement region. * Presence of an open wound or edema in the study device measurement region that would interfere with device placement. * Shunt difficult to palpate or shunt depth greater than 5 mm from the skin surface at the measurement location as determined by ultrasound. * Subject-reported or documented history of serious adverse skin reactions to silicone-based adhesives. * New or worsening symptoms suggestive of shunt malfunction within the previous 7 days. * Use of the study device would interfere with standard patient care, emergency surgery cannot be delayed, or study participation would interfere with optimal medical care. * Participation in another investigational procedural, pharmaceutical, or device study that may affect data collected in this study. * Previous participation in a Rhaeos clinical study using the current-generation RH05-B1 study device. For participants with planned "valve normal" measurements only: -Investigator judges the participant is likely to be shunt independent (e.g., does not require a functional shunt for management of hydrocephalus). This format follows ClinicalTrials.gov conventions by separating general criteria from those that apply only to specific participant subgroups.