Method and apparatus for measuring intracranial fluid pressure

Details Method and apparatus for measuring intracranial fluid pressure Method and apparatus for measuring intracranial fluid pressure

1987-09-17

1989-06-27

Howell, Kyle L.

Surgery

Truss

Pad

128748, A61B 512

Patent

active

048419869

ABSTRACT:
Intracranial fluid pressure is measured as a function of a characteristic or characteristics of an eardrum. Either or both of the displacement of the eardrum when the stapedius muscle is stimulated or the aural acoustic compliance of the eardrum is measured and provided the cochlear aqueduct is open this will give an indication of intracranial fluid pressure without surgery. Acoustic compliance is measured under conditions of tympanometry but the tympanometry facility is disabled during displacement measurement. The data obtained by the method of the invention may be compared with reference data obtained from the same patient or in clinical trials to provide a real-time record of intracranial fluid pressure changes. Preferably eardrum displacement is used as a baseline measure and acoustic compliance measurement records short-term variation, the two records being combined by computer. Reference data may be input to the computer to update the information displayed. This reference data may include known variations determined by surgery or caused by a postural manoeuvre of the patient.

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"A New Method for Noninvasive Measurement of Short-Term Cerebrospinal Fluid Pressure Changes in Humans", Journal of Neurology, by Richard Kast, Spring 1985, pp. 260-261.

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