Laser vibrometry for investigation of tympanic membrane implant materials

Publikation: Beitrag in FachzeitschriftKonferenzartikelBeigetragenBegutachtung

Beitragende

  • Thomas Zahnert - , Klinik und Poliklinik für Hals-Nasen-Ohrenheilkunde (Autor:in)
  • Manfred Küster - , Technische Universität Dresden (Autor:in)
  • Uwe Vogel - , Technische Universität Dresden (Autor:in)
  • Gert Hofmann - , Technische Universität Dresden (Autor:in)
  • Karl Bernd Hüttenbrink - , Technische Universität Dresden (Autor:in)

Abstract

The human tympanic membrane has reasonably good sound sensing properties. A destroyed tympanic membrane due to middle ear diseases or traumata may be repaired by different types of grafts. Middle ear surgery mostly uses autologous temporal fascia, cartilage, or cartilage perichondrium transplants. We have investigated the acoustical and mechanical properties of these materials and compared them with human tympanic membrane by constructing an ear canal model completed by an artificial tympanic membrane. Circular stretched human fascia, perichondrium, and cartilage preparations were exposed to static pressures up to 4 kPa and white noise sound pressure levels of 70 dB. The vibrational amplitudes and displacements due to static pressure of the graft material were measured by laser Doppler vibrometry and compared. The thin materials temporal fascia and perichondrium show similar amplitude frequency responses compared to the tympanic membrane for dynamic excitation. The displacement of these materials at static pressures above 4 kPA yields a higher compliance than tympanic membrane. The acoustical and mechanical properties of cartilage transplants change with the thickness of the slices. However, the thinner the cartilage slice combined with lower stability, the more similar is the frequency response with the intact tympanic membrane. The vibration amplitudes decrease more and more for layer thicknesses above 500μm. Cartilage acts as an excellent transplant material which provides a better prognosis than different materials in cases of ventilation disorders with long-term middle ear pressure changes. Large cartilage slice transplants should not exceed layer thicknesses of 500μm in order to prevent drawbacks to the transfer characteristics of the tympanic membrane.

Details

OriginalspracheEnglisch
Seiten (von - bis)11-18
Seitenumfang8
Fachzeitschrift Proceedings of SPIE - The International Society for Optical Engineering
Jahrgang2927
PublikationsstatusVeröffentlicht - 1996
Peer-Review-StatusJa

Konferenz

TitelEuropäische Woche der biomedizinischen Optik 1996
UntertitelOptical and Imaging Techniques for Biomonitoring II
KurztitelBiOS Europe '96
Dauer7 September 1996
StadtVienna
LandÖsterreich

Externe IDs

ORCID /0000-0003-3894-1175/work/148603880

Schlagworte

Ziele für nachhaltige Entwicklung

Schlagwörter

  • Implant materials, Laser vibrometry, Sound transfer, Static pressure, Tympanic membrane