RESUMO
Tympanic membrane perforation is one of the common diseases in otolaryngology. The main causes of tympanic membrane perforation are otitis,trauma and etc. With the rapid development of finite element analysis method, this method is applied to clinical evaluation of tympanic membrane perforation and repair materials. By establishing the finite element model of the middle ear, the characteristics of tympanic membrane perforation and tympanic membrane repair materials were analyzed from the biomechanical aspect, with combination of clinical application results. In this review, the finite element analysis and clinic research progress of tympanic menbrane perforation and tympanic membrane repair materials were summarized.
RESUMO
Objective Clinical reports on perilymphatic fistulae(PLF) of the round window membrane(RWM) have shown different degrees of hearing loss. For the unknown mechanisms of hearing loss, the morphological changes of cochlea with perilymphatic fistulae(PLF) was studied.Methods Among 10 guinea pigs, each ear on one side was punctured and the ear of another side was used as control. 4 hours after operation, the morphological changes of cochlea were observed.Results It was found that 2 ears with endolymphatic hydrops, 1 ear with strica vascularis stripped, venous hyperemia and hemorrhage in cochlea, 7 ears with no changes.Conclusion The study suggestes that the normal and the abnormal morphological changes of cochlea can all be seen after the rupture of RWM.