Occlusion meter and associated method for measuring the occlusio

Details Occlusion meter and associated method for measuring the occlusio Occlusion meter and associated method for measuring the occlusio

1995-03-29

1996-11-26

Sykes, Angela D.

Surgery

Truss

Pad

381 60, A61B 512

Patent

active

055775110

ABSTRACT:
An instrument for measuring the degree of occlusion of an occluding object, such as an earmold, in the ear canal of a subject is set forth that overcomes the problems associated with prior art devices. The instrument includes a first microphone for transducing sound waves exterior to the ear canal into electrical signals and a first microphone for transducing sound waves within the ear canal into electrical signals. These electrical signals are respectively supplied to first and second logarithmic amplifiers. The first logarithmic amplifier is connected to receive the electrical signals from the first microphone and has a DC output signal that is logarithmically related to the peak amplitude value of the electrical signals received from the first microphone. The second logarithmic amplifier is connected to receive the electrical signals from the second microphone and has a DC output signal that is logarithmically related to the peak amplitude value of the electrical signals received from the second microphone. The DC output signals are supplied to a DC meter. The DC meter may be analog, digital, or may be a video display that provides a visual indication of the difference between the DC outputs of the first and second logarithmic amplifiers. A method of measuring the degree of occlusion of an occluding object in an ear canal is also set forth.

REFERENCES:
patent: 4498332 (1985-02-01), Bruckhoff
patent: 4809708 (1989-03-01), Geisler et al.
patent: 5044373 (1991-09-01), Northeved et al.
patent: 5317273 (1994-05-01), Hanson et al.

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