Finite element modeling of free oscillations of the reconstructed middle ear under stapedotomy
In this paper was performed the finite element calculation of the natural frequencies of free oscillations of the reconstructed middle ear. Models of the malleus, incus and stape obtained on the basis of the tomographic data. The eardrum consists of parts <i>pars tensa</i> and <i>pars flaccid</i>a, having different thickness and elastic modulus. Modal analysis of the oscillation system of the middle ear and normal middle ear prosthesis was performed with a standard negative pressure. The values of the natural frequencies of free vibrations of the normal middle ear and middle ear with prosthesis are found for the respective waveforms. Dependence of the natural frequencies of free oscillations from the number of the main form of the normal middle ear and the middle ear with prosthesis are given. It is shown that at lower frequencies observed the most significant movement of the prosthesis but at the high frequencies the prosthesis hardly moves, due to prevailing oscillations of the tympanic membrane of the middle ear.