ShuntCheck Accuracy in Detecting Shunt Obstruction Normal Pressure Hydrocephalus (NPH) Patients

This study aims to correlate findings of ShuntCheck and MRI with the Radionuclide patency
study. Patients will be enrolled if they have Hydrocephalus or IIH, present with symptoms of
shunt obstruction and will need to undergo shunt patency test and an MRI along with standard
of care radionuclide study. The ShuntCheck study will be conducted in a clinic, doctor's
office or in an emergency room by the treating physician or by trained health care
professionals.

Also, patients who are found with shunt obstruction as diagnosed by Radionuclide study will
undergo shunt revision and the findings of the study will be correlated with operative
findings. Post Shunt replacement patients who also receive adjustable valve will be
evaluated with shunt Check, before and after adjustment of valves to detect changes in flow
as detected by shunt check.

This is an exploratory study to determine how a non-invasive device can assist in detection
of presence of flow in these patients.

Approximately 20 subjects will be enrolled in a single site in this proof of concept,
physician sponsored study. An approved, commercial device will be available to the site
prior to start of the study.

Inclusion Criteria:

1. Adult Patients > 35 years capable and willing to consent for their participation or
consent obtained from a legal guardian.

2. Patients with an indwelling shunt and clinical assessment strongly suggestive of
shunt obstruction

3. Patients are candidates for shunt patency procedures in the elective extension

Exclusion Criteria:

1. Patients <35 years of age

2. Patients with symptoms attributable to valve malfunction or shunt infection

3. Patients who need urgent shunt replacement and therefore cannot wait for the
SHUNTCHECK evaluation of shunt patency.

4. Patients with edema or wound of skin overlying the shunt tissue.

5. Patients not capable or not willing to consent to participate in the study