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Detection of tympanic membrane movement using film patch with integrated strain gauge, assessed by optical coherence tomography: experimental study

  • T Just (a1), T Zehlicke (a1) (a2), O Specht (a3), W Sass (a4), C Punke (a1), W Schmidt (a3), E Lankenau (a5), D Behrend (a3) and H W Pau (a1)...

Abstract

Objective:

We report an ex vivo and in vivo experimental study of a device designed to measure tympanic membrane movement under normal and pathological conditions, assessed using optical coherence tomography.

Materials and methods:

We designed two types of flexible, round film patch with integrated strain gauge, to be attached to the tympanic membrane in order to measure tympanic membrane movement. Tympanic membrane attachment was assessed using optical coherence tomography. The devices were tested experimentally using an ex vivo model with varying middle-ear pressure.

Results:

Optical coherence tomography reliably assessed attachment of the film patch to the tympanic membrane, before and after middle-ear pressure changes. Strain gauge voltage changes were directly proportional to middle-ear pressure recordings, for low pressure changes. Tympanic membrane perforations smaller than 2 mm could be sealed off with the film patch.

Conclusion:

Attachment of the film patch with integrated strain gauge to the tympanic membrane was not ideal. Nevertheless, the strain gauge was able to precisely detect small pressure changes within the middle ear, in this experimental model.

Copyright

Corresponding author

Address for correspondence: Dr Tino Just, Department of Otorhinolaryngology, Head and Neck Surgery, University of Rostock, Doberaner Str 137–139, D-18057 Rostock, Germany Fax: +49 381 494 8302 E-mail: tino.just@med.uni-rostock.de

References

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2Pau, HW, Sievert, U, Just, T, Sade, J. Pressure changes in the human middle ear without opening the eustachian tube. Acta Otolaryngol 2009;129:1182–6
3Just, T, Lankenau, E, Hüttmann, G, Pau, HW. Intra-operative application of optical coherence tomography with an operating microscope. J Laryngol Otol 2009;123:1027–30
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5Zehlicke, T, Behrend, D, Schmidt, W, Hoffmann, F, Müller, J, Pau, HW. Tensometry – concept and first results of a new technique for measuring the tube function via highly flexible foil strain gauges [in German]. Laryngorhinootologie 2008;87:542–5
6Lankenau, E, Klinger, D, Winter, C, Malik, A, Muller, HH, Oelckers, S et al. Combining optical coherence tomography (OCT) with an operating microscope. In: Buzug, TM, Holz, D, Weber, S, Bongartz, J, Kohl-Bareis, M, Hartmann, U, eds. Advances in Medical Engineering. Berlin, Heidelberg: Springer, 2007;343–8
7Sass, W, Zehlicke, T, Moß, C, Pau, HW, Müller, J. Testing of Eustachian tube functioning via strain gauge measurements of the tympanic membrane movement. In: Dössel, O and Schlegel, WC, eds. Berlin, Heidelberg: Springer, IFMBE Proceedings 25/XI, 2009:72–5
8McBride, TP, Decray, CS, Cunningham, MJ, Doyle, WJ. Evaluation of noninvasive Eustachian tube function tests in normal adults. Laryngoscope 1988;98:655–8
9Di Martino, EF, Nath, V, Telle, A, Antweiler, C, Walther, LE, Vary, P. Evaluation of Eustachian tube function with perfect sequences: technical realization and first clinical results. Eur Arch Otorhinolaryngol 2010;267:367–74

Keywords

Detection of tympanic membrane movement using film patch with integrated strain gauge, assessed by optical coherence tomography: experimental study

  • T Just (a1), T Zehlicke (a1) (a2), O Specht (a3), W Sass (a4), C Punke (a1), W Schmidt (a3), E Lankenau (a5), D Behrend (a3) and H W Pau (a1)...

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