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1.
J Otolaryngol Head Neck Surg ; 49(1): 2, 2020 Jan 06.
Artigo em Inglês | MEDLINE | ID: mdl-31907040

RESUMO

BACKGROUND: Despite significant anatomical variation amongst patients, cochlear implant frequency-mapping has traditionally followed a patient-independent approach. Basilar membrane (BM) length is required for patient-specific frequency-mapping, however cochlear duct length (CDL) measurements generally extend to the apical tip of the entire cochlea or have no clearly defined end-point. By characterizing the length between the end of the BM and the apical tip of the entire cochlea (helicotrema length), current CDL models can be corrected to obtain the appropriate BM length. Synchrotron radiation phase-contrast imaging has made this analysis possible due to the soft-tissue contrast through the entire cochlear apex. METHODS: Helicotrema linear length and helicotrema angular length measurements were performed on synchrotron radiation phase-contrast imaging data of 14 cadaveric human cochleae. On a sub-set of six samples, the CDL to the apical tip of the entire cochlea (CDLTIP) and the BM length (CDLBM) were determined. Regression analysis was performed to assess the relationship between CDLTIP and CDLBM. RESULTS: The mean helicotrema linear length and helicotrema angular length values were 1.6 ± 0.9 mm and 67.8 ± 37.9 degrees, respectively. Regression analysis revealed the following relationship between CDLTIP and CDLBM: CDLBM = 0.88(CDLTIP) + 3.71 (R2 = 0.995). CONCLUSION: This is the first known study to characterize the length of the helicotrema in the context of CDL measurements. It was determined that the distance between the end of the BM and the tip of the entire cochlea is clinically consequential. A relationship was determined that can predict the BM length of an individual patient based on their respective CDL measured to the apical tip of the cochlea.


Assuntos
Membrana Basilar/anatomia & histologia , Ducto Coclear/anatomia & histologia , Variação Anatômica , Membrana Basilar/diagnóstico por imagem , Cadáver , Ducto Coclear/diagnóstico por imagem , Implante Coclear , Humanos , Processamento de Imagem Assistida por Computador , Imageamento Tridimensional , Microscopia de Contraste de Fase , Síncrotrons
2.
J Int Adv Otol ; 15(3): 431-435, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31846925

RESUMO

OBJECTIVES: Temporal bone (TB) studies are essential during the development of new arrays. Postoperative cochlear histology is still regarded as golden standard for the assessment of electrode localization and trauma though it is time consuming, expensive and technically very demanding. The aim of this study is to investigate whether pre-operative evacuation of perilymph improve the assessment of electrode localization and insertion trauma in TBs applying fusion imaging. The results were compared to a prior validated image fusion technique based on the quantification of the electrode placement. MATERIALS AND METHODS: 12 prototype electrodes were implanted in fresh frozen TBs. The perilymph was evacuated from the scale prior to pre-operative cone-beam computer tomography (CBCT). The TB were then immersed in Ringer solution to rehydrated both scalae. After electrode insertion post-operative CBCT were obtained. 3D fusions of the pre- and postoperative registration were reconstructed. The electrode localization with respect to the basilar membrane was visually assessed. RESULTS: The visualization of the BM on the pre-operative scans was achieved beyond the second turn in all TBs. The visual assessment was found to be as accurate as the previously validated fusion technique. There was no statistically significant difference between the methods (p=0.564). The image reconstructions and evaluations, however, were faster to perform and the insertion results are immediately available. CONCLUSION: CBCT in combination with pre- and postoperative image fusion is an accurate method for the post-operative assessment of insertion trauma in TBs. This new application facilitates the identification of the BM and allows for a visual assessment of insertion trauma.


Assuntos
Implante Coclear , Tomografia Computadorizada de Feixe Cônico/métodos , Eletrodos Implantados , Imageamento Tridimensional/métodos , Osso Temporal/diagnóstico por imagem , Membrana Basilar/diagnóstico por imagem , Cadáver , Humanos , Perilinfa , Período Pós-Operatório , Período Pré-Operatório , Reprodutibilidade dos Testes , Osso Temporal/cirurgia
3.
Ear Hear ; 40(2): 393-400, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-29952804

RESUMO

OBJECTIVES: The purpose of this study was to evaluate the three-dimensional (3D) anatomy and potential damage to the hook region of the human cochlea following various trajectories at cochlear implantation (CI). The goal was to determine which of the approaches can avoid lesions to the soft tissues, including the basilar membrane and its suspension to the lateral wall. Currently, there is increased emphasis on conservation of inner ear structures, even in nonhearing preservation CI surgery. DESIGN: Micro-computed tomography and various CI approaches were made in an archival collection of macerated and freshly fixed human temporal bones. Furthermore, synchrotron radiation phase-contrast imaging was used to reproduce the soft tissues. The 3D anatomy was investigated using bony and soft tissue algorithms, and influences on inner ear structures were examined. RESULTS: Micro-computed tomography with 3D rendering demonstrated the topography of the round window (RW) and osseous spiral laminae, while synchrotron imaging allowed reproduction of soft tissues such as the basilar membrane and its suspension around the RW membrane. Anterior cochleostomies and anteroinferior cochleostomies invariably damaged the intracochlear soft tissues while inferior cochleostomies sporadically left inner ear structures unaffected. CONCLUSIONS: Results suggest that cochleostomy approaches often traumatize the soft tissues at the hook region at CI surgery. For optimal structural preservation, the RW approach is, therefore, recommended.


Assuntos
Membrana Basilar/diagnóstico por imagem , Implante Coclear , Janela da Cóclea/diagnóstico por imagem , Membrana Basilar/patologia , Cadáver , Cóclea/diagnóstico por imagem , Cóclea/patologia , Implantes Cocleares , Humanos , Imageamento Tridimensional , Microscopia de Contraste de Fase , Janela da Cóclea/patologia , Síncrotrons , Microtomografia por Raio-X
4.
Eur Arch Otorhinolaryngol ; 275(7): 1723-1729, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29799084

RESUMO

PURPOSE: To evaluate the insertion characteristics and trauma of a new slim lateral wall electrode (SlimJ) in human temporal bones (TB). METHODS: Pre- and postoperative assessment was performed using cone beam computed tomography (CBCT) and image fusion in 11 human TB. The position of the array in each cochlea was analyzed and described using a vertical scaling factor, calculated by dividing the distance of the scala tympani floor to the centre of the electrode by the duct height. Insertion trauma was scaled according to the presumed localization of the basilar membrane, which was modeled from histologic sections of 20 TBs. The insertion trauma was described by the adaptation of the Eshragi trauma grading. RESULTS: A full electrode insertion, via the round window, was achieved in all TBs. Surgical handling was good, with a favorable compromise between high flexibility but sufficient stiffness to facilitate smooth insertions. The median angular insertion depth was 368° (range 330°-430°). Scala tympani placement was achieved in ten out of eleven TBs; in one TB a scala translocation was observed, occurring at approximately 180°. CONCLUSIONS: The SlimJ showed atraumatic insertion characteristics. The CBCT fusion technique provides an accurate and reliable assessment of the electrode position and allows for grading insertion trauma without histology. The SlimJ true potential for structure and hearing preservation needs to be further assessed in vivo.


Assuntos
Implante Coclear , Implantes Cocleares , Eletrodos Implantados , Osso Temporal/diagnóstico por imagem , Membrana Basilar/diagnóstico por imagem , Cadáver , Tomografia Computadorizada de Feixe Cônico , Desenho de Equipamento , Humanos , Janela da Cóclea/cirurgia , Rampa do Tímpano/diagnóstico por imagem , Rampa do Tímpano/cirurgia , Osso Temporal/cirurgia
5.
Hear Res ; 363: 28-38, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29605168

RESUMO

Miniature high frequency ultrasound devices show promise as tools for clinical middle ear and basal cochlea imaging and vibrometry. However, before clinical use it is important to verify that the ultrasound exposure does not damage the cochlea. In this initial study, electrophysiological responses of the cochlea were measured for a range of stimulus frequencies in both ears of anesthetized chinchillas, before and after exposing the organ of Corti region of one ear to pulsed focused ultrasound for 30 min. Measurements were again taken after an 11 day survival period. Cochlear tissue was examined with a confocal microscope for signs of damage to the cochlear hair cells. No significant change in response thresholds due to exposure was found, and no signs of ultrasound-induced tissue damage were observed, although one animal (out of ten) did have a region of extensive tissue damage in the exposed cochlea. However, after further analysis this was concluded to be not likely a result of the ultrasound exposure.


Assuntos
Membrana Basilar/diagnóstico por imagem , Cóclea/diagnóstico por imagem , Células Ciliadas Auditivas , Ultrassonografia/métodos , Estimulação Acústica , Animais , Audiometria de Resposta Evocada , Limiar Auditivo , Membrana Basilar/fisiologia , Sobrevivência Celular , Chinchila , Cóclea/fisiologia , Desenho de Equipamento , Células Ciliadas Auditivas/fisiologia , Masculino , Microscopia Confocal , Miniaturização , Valor Preditivo dos Testes , Medição de Risco , Fatores de Risco , Fatores de Tempo , Transdutores , Ultrassonografia/efeitos adversos , Ultrassonografia/instrumentação
6.
Ups J Med Sci ; 123(1): 9-18, 2018 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-29537931

RESUMO

OBJECTIVE: We used synchrotron radiation phase contrast imaging (SR-PCI) to study the 3D microanatomy of the basilar membrane (BM) and its attachment to the spiral ligament (SL) (with a conceivable secondary spiral lamina [SSL] or secondary spiral plate) at the round window membrane (RWM) in the human cochlea. The conception of this complex anatomy may be essential for accomplishing structural preservation at cochlear implant surgery. MATERIAL AND METHODS: Sixteen freshly fixed human temporal bones were used to reproduce the BM, SL, primary and secondary osseous spiral laminae (OSL), and RWM using volume-rendering software. Confocal microscopy immunohistochemistry (IHC) was performed to analyze the molecular constituents. RESULTS: SR-PCI reproduced the soft tissues including the RWM, Reissner's membrane (RM), and the BM attachment to the lateral wall (LW) in three dimensions. A variable SR-PCI contrast enhancement was recognized in the caudal part of the SL facing the scala tympani (ST). It seemed to represent a SSL allied to the basilar crest (BC). The SSL extended along the postero-superior margin of the round window (RW) and immunohistochemically expressed type II collagen. CONCLUSIONS: Unlike in several mammalian species, the human SSL is restricted to the most basal portion of the cochlea around the RW. It anchors the BM and may influence its hydro-mechanical properties. It could also help to shield the BM from the RW. The microanatomy should be considered at cochlear implant surgery.


Assuntos
Implante Coclear/métodos , Lâmina Espiral/diagnóstico por imagem , Membrana Basilar/anatomia & histologia , Membrana Basilar/diagnóstico por imagem , Humanos , Imuno-Histoquímica , Janela da Cóclea/anatomia & histologia , Janela da Cóclea/diagnóstico por imagem , Lâmina Espiral/anatomia & histologia
7.
J Acoust Soc Am ; 141(6): 4610, 2017 06.
Artigo em Inglês | MEDLINE | ID: mdl-28679279

RESUMO

The basilar membrane and organ of Corti in the cochlea are essential for sound detection and frequency discrimination in normal hearing. There are currently no methods used for real-time high resolution clinical imaging or vibrometry of these structures. The ability to perform such imaging could aid in the diagnosis of some pathologies and advance understanding of the causes. It is demonstrated that high frequency ultrasound can be used to measure basilar membrane vibrations through the round window of chinchilla cochleas in vivo. The basic vibration characteristics of the basilar membrane agree with previous studies that used other methods, although as expected, the sensitivity of ultrasound was not as high as optical methods. At the best frequency for the recording location, the average vibration velocity amplitude was about 4 mm/s/Pa with stimulus intensity of 50 dB sound pressure level. The displacement noise floor was about 0.4 nm with 256 trial averages (5.12 ms per trial). Although vibration signals were observed, which likely originated from the organ of Corti, the spatial resolution was not adequate to resolve any of the sub-structures. Improvements to the ultrasound probe design may improve resolution and allow the responses of these different structures to be better discriminated.


Assuntos
Membrana Basilar/diagnóstico por imagem , Membrana Basilar/fisiologia , Cóclea/diagnóstico por imagem , Cóclea/fisiologia , Audição , Ultrassonografia/métodos , Estimulação Acústica , Animais , Chinchila , Desenho de Equipamento , Masculino , Mecanotransdução Celular , Miniaturização , Movimento (Física) , Pressão , Som , Transdutores , Ultrassonografia/instrumentação , Vibração
8.
Cochlear Implants Int ; 18(4): 192-197, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-28534710

RESUMO

INTRODUCTION: Cochlear implantation (CI) has developed from its origins in the 1980s. Initially, CI was for profound bilateral hearing impairment. However, candidacy for CI have become more widespread in recent years with unilateral implantation and an emphasis on hearing preservation. Evidence supports full electrode insertion in an atraumatic fashion into the scala tympani (ST) provides optimal hearing outcomes. The main aim of this systematic review was to elucidate the degree of trauma associated with CI insertion. METHODS: A systematic literature search was undertaken using PubMed Medline. A grading system described by Eshraghi was used to classify cochlear trauma. Both radiological and histological studies were included. RESULTS: Twenty one papers were identified which were relevant to our search. In total, 653 implants were inserted and 115 (17.6%) showed evidence of trauma. The cochleas with trauma had basilar membrane elevation in 5.2%, ruptured in 5.2%, the electrode passed from the ST to the SV in 84.4% and there was grade 4 trauma in 5.2%. The studies used a variety of histological and radiological methods to assess for evidence of trauma in both cadaveric temporal bones and live recipients. CONCLUSIONS: Minimizing cochlear trauma during implant insertion is important to preserve residual hearing and optimize audiological performance. An overall 17.6% trauma rate suggests that CI insertion could be improved with more accurate and consistent electrode insertion such as in the form of robotic guidance. The correlation of cochlea trauma with post-operative hearing has yet to be determined.


Assuntos
Cóclea/lesões , Implante Coclear/efeitos adversos , Complicações Pós-Operatórias/diagnóstico por imagem , Complicações Pós-Operatórias/patologia , Adulto , Membrana Basilar/diagnóstico por imagem , Membrana Basilar/patologia , Membrana Basilar/cirurgia , Cóclea/diagnóstico por imagem , Cóclea/patologia , Implantes Cocleares/efeitos adversos , Feminino , Perda Auditiva/cirurgia , Humanos , Masculino , Complicações Pós-Operatórias/etiologia , Radiografia/métodos , Rampa do Tímpano/diagnóstico por imagem , Rampa do Tímpano/patologia , Rampa do Tímpano/cirurgia , Osso Temporal/diagnóstico por imagem , Osso Temporal/patologia , Osso Temporal/cirurgia
9.
Eur Arch Otorhinolaryngol ; 271(4): 673-9, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23536136

RESUMO

Postoperative imaging plays a growing role in clinical studies concerning prognostic factors in cochlear implantation. Indeed, intracochlear position of the cochlear implant has recently been identified as a contributor in functional outcomes and radiological tools must be accurate enough to determine the final placement of the electrode array. The aim of our study was to validate cone beam computed tomography as a reliable technique for scalar localization of the electrode array. We performed therefore a temporal bone study on ten specimens that were implanted with a perimodiolar implant prototype. Cone beam reconstructions were performed and images were analyzed by two physicians both experienced in cochlear implant imaging, who determined the scalar localization of the implant. Temporal bones then underwent histological control to document this scalar localization and hypothetical intracochlear lesions. In four cases, a dislocation from scala tympani to scala vestibuli was suspected on cone beam reconstructions of the ascending part of the basal turn. In three of these four specimens, dislocation in pars ascendens was confirmed histologically. In the remaining temporal bone, histological analysis revealed an elevation with rupture of the basilar membrane. Histological assessment revealed spiral ligament tearing in another bone. We conclude that cone beam is a reliable tool to assess scalar localization of the selectrode array and may be used in future clinical studies.


Assuntos
Membrana Basilar/diagnóstico por imagem , Implantes Cocleares , Falha de Prótese , Rampa do Tímpano/diagnóstico por imagem , Osso Temporal/diagnóstico por imagem , Membrana Basilar/patologia , Cóclea/diagnóstico por imagem , Cóclea/patologia , Implante Coclear , Tomografia Computadorizada de Feixe Cônico , Eletrodos Implantados , Humanos , Modelos Anatômicos , Reprodutibilidade dos Testes , Rampa do Tímpano/patologia , Osso Temporal/patologia
10.
Ultrasound Med Biol ; 38(12): 2208-17, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-22975040

RESUMO

We have developed a high-frequency pulsed-wave Doppler ultrasound probe as a promising minimally-invasive technique for measuring intracochlear mechanics without damaging the cochlea. Using a custom high-frequency ultrasound system, we have measured dynamic motion of intracochlear structures by recording the pulsed-wave Doppler signal resulting from the vibration of the basilar and round window membranes. A 45 MHz needle-mounted Doppler probe was fabricated and placed against the round window membranes of eight different fresh human temporal bones. Pulsed-wave ultrasonic Doppler measurements were performed on the basilar membrane and round window membrane during the application of pure tones to the external ear canal. Doppler vibrational information for acoustic input frequencies ranging from 100-2000 Hz was collected and normalized to the sound pressure in the ear canal. The middle ear resonance, located at approximately 1000 Hz, could be characterized from the membrane velocities, which agreed well with literature values. The maximum normalized mean velocity of the round window and the basilar membrane were 180 µm/s/Pa and 27 µm/s/Pa at 800 Hz. The mean phase difference between the membrane displacements and the applied ear canal sound pressure showed a flat response almost up to 500 Hz where it began to accumulate. This is the first study that reports the application of high frequency pulsed wave Doppler ultrasound for measuring the vibration of basilar membrane through the round window. Since it is not required to open or damage the cochlea, this technique might be applicable for investigating cochlear dynamics, in vivo.


Assuntos
Membrana Basilar/fisiologia , Cóclea/fisiologia , Ecocardiografia Doppler de Pulso , Janela da Cóclea/fisiologia , Idoso , Idoso de 80 Anos ou mais , Membrana Basilar/diagnóstico por imagem , Cóclea/diagnóstico por imagem , Feminino , Humanos , Técnicas In Vitro , Masculino , Pessoa de Meia-Idade , Janela da Cóclea/diagnóstico por imagem , Ultrassom , Vibração
11.
J Acoust Soc Am ; 127(5): 2973-91, 2010 May.
Artigo em Inglês | MEDLINE | ID: mdl-21117747

RESUMO

A finite-element analysis is used to explore the impact of elastic material properties, boundary conditions, and geometry, including coiling, on the spatial characteristics of the compliance of the unloaded basilar membrane (BM). It is assumed that the arcuate zone is isotropic and the pectinate zone orthotropic, and that the radial component of the effective Young's modulus in the pectinate zone decreases exponentially with distance from base to apex. The results concur with tonotopic characteristics of compliance and neural data. Moreover, whereas the maximum compliance in a radial profile is located close to the boundary between the two zones in the basal region, it shifts to the midpoint of the pectinate zone for the apical BM; the width of the profile also expands. This shift begins near the 1 kHz characteristic place for guinea pig and the 2.4 kHz place for gerbil. Shift and expansion are not observed for linear rather than exponential decrease of the radial component of Young's modulus. This spatial change of the compliance profile leads to the prediction that mechanical excitation in the apical region of the organ of Corti is different to that in the basal region.


Assuntos
Membrana Basilar/fisiologia , Análise de Elementos Finitos , Mecanotransdução Celular , Modelos Biológicos , Animais , Membrana Basilar/diagnóstico por imagem , Fenômenos Biomecânicos , Complacência (Medida de Distensibilidade) , Módulo de Elasticidade , Cobaias , Pressão , Microtomografia por Raio-X
12.
Otol Neurotol ; 23(2): 187-91, 2002 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-11875348

RESUMO

BACKGROUND: There are no satisfactory, noninvasive techniques currently available to visualize the cochlear implant (CI) electrode in a dynamic state as it is advanced inside the cochlea. OBJECTIVE: This study describes a radiologic technique that can be used in temporal bones to monitor the electrode position in real time and to visualize the basilar membrane. METHODS: A cochleostomy was performed in accordance with the normal procedure for cochlear implantation in seven fresh cadaveric temporal bones. A special x-ray tube (Microfocus; Focus, Wunstorf, Germany) with a spot size of 1 microm and fluoroscopy were used for continuous videotape imaging of the advancing electrode in the cochlea. Conventional electrodes (MED-EL 40+; MED-EL, Innsbruck, Austria) and prototypes of perimodiolar electrodes (MED-EL), with varying thicknesses and angles of insertion, were used for the study. Finally, contrast liquid (Ultravist; Berlex Imaging, Schering, Germany) was injected into the scala vestibuli through the stapes footplate. RESULTS: The advancing electrode carrier was clearly visible at x20 magnification. With the perimodiolar electrodes, deep insertion was impossible if the guiding wire was too rigid, and retraction occurred if the wire was soft. The intact nature of the basilar membrane could be confirmed by the sequential filling of scala vestibuli and the scala tympani. CONCLUSION: To our knowledge, this is the first noninvasive study demonstrating continuous visualization with high-resolution and x-ray magnification of CI electrode advancement inside the intact cochlea. Our technique can be used for the development of CI electrodes with optimal design characteristics, especially stiffness. Visualization of the basilar membrane will influence the insertion techniques when CIs are developed for patients with residual hearing.


Assuntos
Cóclea/diagnóstico por imagem , Cóclea/patologia , Implante Coclear , Movimento (Física) , Membrana Basilar/diagnóstico por imagem , Membrana Basilar/patologia , Eletrodos Implantados , Fluoroscopia/métodos , Humanos
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