Measuring method, measuring apparatus and indication method of t

Details Measuring method, measuring apparatus and indication method of t Measuring method, measuring apparatus and indication method of t

1989-10-18

1991-11-12

Pellegrino, Stephen C.

Surgery

Truss

Pad

128747, 73585, A61B 500

Patent

active

050639463

ABSTRACT:
A probe is inserted into an external auditory meatus; the internal pressure of the external auditory meatus is maintained at the predetermined pressure by supplying the air from an air pump connected to one of the sound induction hole; an oscillation signal within the audible range converted into a sound with a predetermined sound pressure is transmitted into the external auditory meatus through another sound induction hole of said probe; and the change in the sound pressure within the external auditory meatus is measured through a microphone. Said probe is to be formed of a hard and relatively thick material and as small as possible in length. Said internal pressure of the external auditory meatus, the frequency of said oscillation signal and the said sound pressure in the external auditory meatus are plotted on a three-dimensional coordinates in order to express three-dimensionally the change in the sound pressure in said external auditory meatus accompanying the change in the impedance of the eardrum surface to the inputted sound where said internal pressure of the external auditory meatus and the frequency of said oscillation signal are given as the parameters.

REFERENCES:
patent: 3757769 (1973-09-01), Arguimbau et al.
patent: 4079198 (1978-03-01), Bennett
patent: 4251686 (1981-02-01), Sokolich
patent: 4289143 (1981-09-01), Cananesio et al.
patent: 4349083 (1982-09-01), Bennett
patent: 4586194 (1986-04-01), Kohashi et al.
patent: 4809708 (1989-03-01), Geisler et al.
patent: 4850962 (1989-07-01), Schaefer

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