Headphones to diagnose brain injury, infection

How would you use this for stroke or TBI detection?
http://blog.applysci.com/?p=4026
Robert Marchbanks and Tony Birch at University Hospital Southampton have developed a noninvasive  brain pressure test to detect head injuries and infections.
The cerebral and cochlear fluid pressure (CCFP) test uses patient headphones  to measure ICP via a channel which links the inner ear with the brain. As fluids in the ear and brain are connected, a change in pressure in the brain is reflected by a pressure change in the ear.  Changes to ICP occur when the brain swells due to injury or infection and prevents blood flow.
ICP is currently measured by drilling a hole through the skull to implant a pressure probe, or by lumbar puncture, where a spinal cord fluid sample is removed with a needle.