49 documents found, page 1 of 5
Numerical study of tympanosclerosis including its effect on human hearing
Gentil, Fernanda; Parente, Marco; Santos, Carla; Areias, Bruno; Jorge, Renato NatalTympanosclerosis is an abnormal disorder of the middle ear or only the eardrum (i.e., myringosclerosis) in which there are calcium deposits. Normally, it is caused by recurrent middle ear infections. In this work, a 3D finite element model of the ear was developed, simulating different cases of tympanosclerosis. Through this model, the magnitude and the phase angle of the umbo and stapes displacement were obtai...
Efeitos biomecânicos da evolução do colesteatoma sobre a corda do tímpano
Gentil, Fernanda; Mendonça, Leonor; Santos, Carla; Parente, Marco; Areias, Bruno; Natal, RenatoA otite média crónica pode levar ao aparecimento de um tumor benigno do ouvido, chamado colesteatoma. Esta patologia, se não for devidamente tratada, pode ter graves consequências. Uma delas pode resultar em paralisia facial se comprimir um ramo do nervo facial que atravessa o ouvido médio. Neste trabalho foram avaliadas as tensões exercidas do tumor contra o nervo. A maior tensão foi obtida na área de contacto...
Auditory brainstem response in children with risk factor for hearing loss: comp...
Quintela, Lara; Gentil, Fernanda; Tavares, João Manuel R.S.The auditory brainstem response (ABR) is classically evoked with the click stimulus. New stimuli, such as chirp, have been proposed with the aim of improving the identification of different types and degrees of hearing loss.
On the hearing effects of a cholesteatoma growing: A biomechanical study
Mendonça, Leonor ; Santos, Carla F.; Gentil, Fernanda; Parente, Marco ; Areias, Bruno ; Jorge, Renato NatalChronic otitis media enables the appearance of a benign middle ear tumor, known as a cholesteatoma, that may compromise hearing. To evaluate the influence of a cholesteatoma growth on the hearing function, a computational middle ear model based on the finite element method was used and three different size of cholesteatoma were modeled. The cholesteatoma solidification and the consequent degradation of the ossi...
A finite element model to predict the consequencesof endolymphatic hydrops in t...
Areias, Bruno; Parente, Marco P. L.; Gentil, Fernanda; Caroça, Cristina; Paço, João; Jorge, Renato M. NatalMénière's disease is an inner ear disorder, associated with episodes of vertigo,fluctuant hearing loss, tinnitus, and aural fullness. Ménière's disease is associ-ated with endolymphatic hydrops. Clinical evidences show that this disease isoften incapacitating, negatively affecting the patients' everyday life. The patho-genesis of Ménière's disease is still not fully understood and remains unclear.Previous numer...
Modelação computacional de um tumor do ouvido médio e análise biomecânica do se...
Santos, Carla F.; Mendonça, Leonor; Gentil, Fernanda; Parente, Marco; Jorge, Renato NatalA otite média crónica é uma condição que pode levar ao aparecimento e crescimento de um tumor benigno do ouvido médio, um colesteatoma, o que poderá comprometer a audição [1]. De forma a avaliar a influência do crescimento de um colesteatoma na função auditiva, foi utilizado um modelo do ouvido médio desenvolvido através do método de elementos finitos. O colesteatoma foi modelado na conexão entre o martelo e a ...
Influence of the basilar membrane shape and mechanical properties in the cochle...
Areias, Bruno; Parente, Marco; Gentil, Fernanda; Jorge, Renato NatalHearing impairment is one of the most common health disorders, affecting individuals of all ages, reducing considerably their quality of life. At present, it is known that during an acoustic stimulation a travelling wave is developed inside the cochlea. Existing mathematical and numerical models available in the literature try to describe the shape of this travelling wave, the majority of them present a set of ...
Influence of the insertion speed during a straight electrode array implantation...
Areias, Bruno; Parente, Marco; Gentil, Fernanda; Natal, RenatoApproximately 466 million people worldwide suffer from some type of hearing loss. About ninety-three percent of them are adults, aged over 15 years (World Health Organization 2018). Profound hearing loss in children lead to a deficient development of spoken language, resulting in a negative impact on daily communication. On the other hand, in adults which have acquired the profound hearing loss after having dev...
Influence of middle ear tumours on the biomechanical behaviour of the chorda ty...
Mendonça, Leonor; Santos, Carla F.; Gentil, Fernanda; Parente, Marco; Areias, Bruno; Jorge, Renato NatalChronic otitis media may lead to the development of a cholesteatoma, a benign middle ear tumour. If this occurs, the chorda tympani nerve, a facial nerve branch that crosses the middle ear, may be compromised. The influence of cholesteatoma development near chorda tympani nerve was studied, in order to assess the consequences of this mass in terms of possible facial paralysis. To do so, an ear model based on th...
Cupula response to otoconia debris in the semicircular canal
Santos, Carla F.; Belinha, J.; Gentil, Fernanda; Parente, Marco; Jorge, Renato NatalThe vertigo symptoms are commonly related with inner ear diseases and it affects 20%-30% of the world population, and its prevalence increases with age. In this work, a three-dimensional computational model of the semicircular canal of the vestibular system, containing the fluids which promote the body balance, was used. The smoothed-particle hydrodynamics method was the computational process used to simulate t...