Measurements of CSF Shunts and Off-Shunt Locations With Wireless Thermal Anisotropy Measurement Devices

Inclusion criteria:

1. At least one existing ventricular CSF shunt, functional or non-functional (includingan adjustable valve set to "virtual off," ligated shunt, uncorrected distal catheterdisconnection or fracture, distal catheter fragment left in place during shuntsurgery, or indication that the shunt is otherwise non-functional), with a region ofoverlying intact skin appropriate in size for application of the study device

2. If more than one distal shunt catheter is present, at least one distal shuntcatheter is at least 2 cm away from any other distal shunt catheter in the devicemeasurement region

3. Signed informed consent by subject or a parent, legal guardian, health care agent,or surrogate decision maker (according to local statutes)

4. Signed medical records release by subject or a parent, legal guardian, health careagent, or surrogate decision maker (according to local statutes)

5. Verbal assent by minors 7 years of age and older who are able to understand thestudy and communicate their decision

Exclusion criteria:

1. Presence of an interfering open wound or edema in the FlowSense device measurementarea

2. Patient-reported history of serious adverse skin reactions to silicone-basedadhesives

3. Use of the study device would interfere with standard patient care, or emergencysurgery that cannot be delayed, or participation in the study will interfere with,or be detrimental to, administration of optimal healthcare to the subject

4. Participation in any other investigational procedural, pharmaceutical, and/or devicestudy that may influence the collection of valid data under this study