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TMD for non-invasive intracranial pressure measurement

We have over 15 years of experience in assessing intracranial pressure non-invasively within the NIPA (non-invasive intracranial pressure) unit, using the MMS-11 cerebral and cochlear fluid pressure analyser (also known as the MMS-11 tympanic membrane displacement analyser).

This technique is mainly used for assessing relative changes in pressure, for example if you are having medical or surgical treatment that is being used to regulate intracranial pressure.

You may be referred for further investigation by the NIPA unit if: 

  • you are at risk of intracranial hypertension or hypotension, and if you would benefit from short, medium or long-term serial pressure measurements
  • a non-invasive intracranial pressure measurement technique would reduce the need for lumbar puncture or surgical methods of intracranial pressure monitoring.

Having a TMD

The tympanic membrane displacement is simple, painless and non-invasive. A detector is placed within your ear canal. You may hear a series of clicks or tones. The measurement takes up to 40 minutes. TMD is also used in balance and hearing assessment.

Meet the team

Dr Bob Marchbanks is head of the service. He pioneered the TMD technique and is involved in many research projects relating to its use.

You can email Dr Marchbanks at

Contact us

Call us on 023 8120 6109.