Sticker on the skin could replace scans for shunt checks

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.