Method of measurement of Eustachian tube opening and associated

Details Method of measurement of Eustachian tube opening and associated Method of measurement of Eustachian tube opening and associated

1983-12-12

1985-10-15

Cohen, Lee S.

Surgery

Truss

Pad

A61B 512

Patent

active

045467790

ABSTRACT:
A sound wave signal is applied to the nasal cavity and is picked up at the auditory canal of the ear of a subject. The phase difference between the two signals is a measure of the extent of opening of the Eustachian tube. By converting the two sound signals to electrical signals and transmitting them to a phase comparator it is possible to ascertain the changes in opening of the Eustachian tube during swallowing.

REFERENCES:
patent: 4429702 (1984-02-01), Von Recklinghausen
Cabot, et al., "Detection of Phase Shifts in Harmonically Related Tones", Journ. of Audio Engr. Soc., vol. 24, No. 7, 9-1976, pp. 568-571.

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