NEW PNEUMOPHONE: An Economical and Simple Diagnostic Instrument for Rapid Quantitative Determination of Eustachian Tubal Function

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Abstract
THE PRINCIPLE of listening for a change in sound intensity with change in tension of the tympanic membrane has been known for more than 70 years, since the writing of Lucas and Gellé, and is now fully accepted by recent researchers in the field.1 Taking cognizance of the clinical importance of this technical principle, van Dishoeck in 1937 introduced a practical pneumophone for accurately evaluating Eustachian tube function.2 No doubt because of the complexity and the cost of the pneumophones used by the researchers, there has been very little appeal to the practicing otolaryngologists to use them in routine office practice. To overcome these disadvantages, I am presenting a new apparatus. Van Dishoeck3 stated that a very simple pneumophone could be constructed by fixing the bone receiver of an audiometer to the outer wall of a small metal chamber provided with an earpiece. The 500 cps tone

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