Apparatus and method for measurement of intracranial pressure with lower frequencies of acoustic signal
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United States of America Patent
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Jul 6, 1999
Grant Date -
N/A
app pub date -
May 6, 1997
filing date -
May 6, 1997
priority date (Note) -
Expired
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Abstract
A non-invasive apparatus and method are disclosed for measuring intracranial pressure. The intracranial measurement system transmits acoustic signals through a cranium and provides an indication of intracranial pressure based on the received acoustic signals after interaction with the brain. Properties such as acoustic transmission impedance, resonant frequency, resonance characteristics, velocity of sound and the like may be measured and correlated with intracranial pressure. The acoustic signals have typical frequencies of less than 100 kHz, for example, in the audible and sub-audible frequency ranges. The intensity of the transmitted acoustic signals used to determine intracranial pressure is relatively low, resulting in little or no health risks during short term or long term monitoring.
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