Middle Ear Mechanics of Cartilage Tympanoplasty Evaluated by Laser Holography and Vibrometry

摘要: Cartilage is commonly used in reconstruction of the tympanic membrane (TM) to provide mechanical stability prevent formation retraction pockets and also reduce extrusion ossicular replacement prostheses. A variety cartilage grafts varying size, shape, thicknesses have been described (1,2). Although used, effects TM on middle ear sound transmission not characterized a systematic manner. Only few studies investigated acoustics grafts. Lee et al. (3,4), using finite element model analysis, suggested that graft should be as thin possible optimize its acoustic characteristics. Zahnert (5) Murbe (6) studied properties an experimental setting. In present study, we mechanics tympanoplasty by laser holography Doppler vibrometry cadaveric temporal bone preparation. We applied computer-assisted high-speed optoelectronic (OEH) study vibration entire (7). The main features OEH are holographic interference patterns digitized, computation images enabled use computer-controlled variations length optical path (8). Optoelectronic promising new technique for investigating function (7,9). produces time-averaged holograms (TAHs) show different kinds fringe depending sound-stimulus frequency level. can divided into simple, complex, ordered (7,10,11).