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The reconstruction of the sound conductive mechanism: a new concept.

Heterologous tympanoplasty using the collagen-serosa that is prepared in a special way has been performed for over 20 years with good success. The membrane is well tolerated as a platform for the overgrowing lining and a drum head of three layers is formed. The newly devised tympanic prosthesis seems to be very useful so far. Experiences and results will be discussed in future.