Apparatus and method for measurement of intracranial pressure with lower frequencies of acoustic signal
First Claim
1. Apparatus for measuring intracranial pressure comprising:
- at least one acoustic signal transmitter capable of transmitting an acoustic signal including frequencies of less than about 100 kHz into a cranium to ensonify a brain in the cranium;
at least one acoustic signal receiver in communication with the acoustic signal transmitter for receiving the acoustic signal; and
an analyzer capable of indicating intracranial pressure based on the received acoustic signal.
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Accused Products
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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Citations
24 Claims
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1. Apparatus for measuring intracranial pressure comprising:
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at least one acoustic signal transmitter capable of transmitting an acoustic signal including frequencies of less than about 100 kHz into a cranium to ensonify a brain in the cranium; at least one acoustic signal receiver in communication with the acoustic signal transmitter for receiving the acoustic signal; and an analyzer capable of indicating intracranial pressure based on the received acoustic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for measuring intracranial pressure comprising:
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means for transmitting an acoustic signal including frequencies of less than about 100 kHz into a cranium to ensonify a brain in the cranium; means for receiving the acoustic signal; and means for indicating intracranial pressure based on the received acoustic signal. - View Dependent Claims (9, 10, 11, 12)
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13. Apparatus for measuring intracranial pressure comprising:
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means for transmitting an acoustic signal including frequencies of less than about 100 kHz into a cranium; and means for indicating intracranial pressure based on a driving point impedance of the acoustic signal transmitting means.
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14. A method of measuring intracranial pressure comprising:
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receiving an acoustic signal including frequencies of less than about 100 kHz from an ensonified brain in a cranium; and determining intracranial pressure from the received acoustic signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method of measuring intracranial pressure comprising:
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transmitting an acoustic signal including frequencies of less than about 100 kHz into a cranium with an acoustic signal transmitter; and indicating intracranial pressure based on a driving point impedance of the acoustic signal transmitter.
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23. A method of measuring intracranial pressure comprising:
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generating at least one resonant frequency within a brain in a cranium; and determining intracranial pressure based on the at least one resonant frequency. - View Dependent Claims (24)
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Specification