Summary
Background: So far there is no suitable method to record the function of the Eustachian tube
(ET), because all available techniques either do not reflect physiological requirements
or just record "snapshot" of single openings of the ET.
A new concept is introduced, by which the effect of tube function on the tympanic
membrane (TM) can be measured. In- and outward movements of the TMs are recorded by
means of highly flexible foil strain gauges ("Tensometry").
Methods: First prototypes of thin measuring foils were manufactured, which could be attached
to the TM and fixed by water adhesion forces. The actual foil strain gauges were printed
on thin PET-foils in a photo-chemical procedure. First practical tests were carried
out on volunteers in pressure chambers.
Results: The prototypes were able to record deviations of the TM reproducibly and without
causing pain to the test person. It was possible to detect slow deflections of the
TM due to relative pressure differences between the middle ear and the environment,
and also fast reset movements due to openings of the ET.
Discussion: After demonstrating the basic feasibility of the tensometry method, we now focus
on improving the wearing comfort and the technique for picking up the measuring signals.
A method of wireless recording of such signals is presently being developed, which
will greatly facilitate the measuring procedure.
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Dr. Thorsten Zehlicke
Bundeswehrkrankenhaus Hamburg, Abteilung für Hals-Nasen-Ohrenheilkunde
Lesserstr. 180
22049 Hamburg
