Tympanometric apparatus

Details Tympanometric apparatus Tympanometric apparatus

1982-06-04

1984-03-06

Howell, Kyle L.

Surgery

Truss

Pad

128 9, 128746, A61B 600

Patent

active

044348002

ABSTRACT:
Tympanometric apparatus comprises a housing of two tubular parts (10, 11) interconnected in a T-shape, a first part (10) having an eyepiece (13) and a speculum (12) at its opposite ends, a semi-silvered or dielectric mirror (14) between the ends, and light and sound sources (15, 16) between the mirror and speculum, and the other housing part (11) having a photodetector (19) across a small area thereof and focusing means (22) between this and the first housing part, the light source projecting a beam through the speculum for reflection from a tympanum to be examined, this reflection being partly transmitted through the mirror to the eyepiece and partly reflected again to be focused on the photodetector, and the sound source causing oscillation of the tympanum with consequent variation of the reflection path and photodetector output. Preferably a microphone (23) is also carried by the first housing part to monitor the acoustic pressure adjacent the tympanum. The mirror is suitably of dichroic form and preferably transmits visible light while reflecting infrared.

REFERENCES:
patent: 3596653 (1971-08-01), Hotchkiss
patent: 3952583 (1976-04-01), Rosati
patent: 4339954 (1982-07-01), Anson et al.
Jako, G. J. et al., "Use of a New Photoelectric Device (Fotonic Sensor) for Vibration Measurements in the Ear," Journal Acoustical Soc. Am., vol. 40, No. 5, p. 1263, Nov. 1966.
Uyemura, T. et al., "Holographic Interferometry for Study on Hearing Mechanism and Combination with Optical Fibers," Proc. Soc. Photo-Opt. Instrum. Eng., (USA), vol. 192, pp. 209-216, (1979).

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