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Gotowa bibliografia na temat „Cochlear implant”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 20 lipca 2024

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Artykuły w czasopismach na temat "Cochlear implant"

Maurer, Jan, Nicolaos Marangos i E. Ziegler. "Reliability of cochlear implants". Otolaryngology–Head and Neck Surgery 132, nr 5 (maj 2005): 746–50. http://dx.doi.org/10.1016/j.otohns.2005.01.026.

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BACKGROUND: The long-term reliability of cochlear implants over time is an important issue for patients and cochlear implant teams. The calculation of cumulative survival rates including all hard failures of cochlear implants is suitable to report objectively about cochlear implant reliability. METHODS: This is a report of 192 cochlear implants from different manufacturers in adults (n = 58) and children (n = 134). RESULTS: The overall cumulative implant survival rate was 91.7% for a period of 11 years. The main reasons for hard failures were design errors of the products and direct or indirect trauma to the cochlea implant site (especially in children) with consecutive breaks of the implant body or electrodes. CONCLUSIONS: To improve our knowledge about reliability of cochlear implants more studies on cumulative long time survival of cochlear implants are needed, where functional failures and complications for whatever reason (design, mechanical, electronic, medical) are included. Cochlear implant reliability data should be considered during the choice of an implant for each individual patient. (Otolaryngol Head Neck Surg 2005;132:746-50.)

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Islam, Rumana, i Mohammed Tarique. "Investigating the Performance of Gammatone Filters and Their Applicability to Design Cochlear Implant Processing System". Designs 8, nr 1 (2.02.2024): 16. http://dx.doi.org/10.3390/designs8010016.

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Commercially available cochlear implants are designed to aid profoundly deaf people in understanding speech and environmental sounds. A typical cochlear implant uses a bank of bandpass filters to decompose an audio signal into a set of dynamic signals. These filters’ critical center frequencies imitate the human cochlea’s vibration patterns caused by audio signals. Gammatone filters (GTFs), with two unique characteristics: (a) an appropriate “pseudo resonant” frequency transfer function, mimicking the human cochlea, and (b) realizing efficient hardware implementation, could demonstrate them as unique candidates for cochlear implant design. Although GTFs have recently attracted considerable attention from researchers, a comprehensive exposition of GTFs is still absent in the literature. This paper starts by enumerating the impulse response of GTFs. Then, the magnitude spectrum, , and bandwidth, more specifically, the equivalent rectangular bandwidth (ERB) of GTFs, are derived. The simulation results suggested that optimally chosen filter parameters, e.g., critical center frequencies,; temporal decay parameter, ; and order of the filter, , can minimize the interference of the filter bank frequencies and very likely model the filter bandwidth (ERB), independent of . Finally, these optimized filters are applied to delineate a filter bank for a cochlear implant design based on the Clarion processor model.

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Toulemonde, Philippine, Michaël Risoud, Pierre Emmanuel Lemesre, Cyril Beck, Jean Wattelet, Meryem Tardivel, Juergen Siepmann i Christophe Vincent. "Evaluation of the Efficacy of Dexamethasone-Eluting Electrode Array on the Post-Implant Cochlear Fibrotic Reaction by Three-Dimensional Immunofluorescence Analysis in Mongolian Gerbil Cochlea". Journal of Clinical Medicine 10, nr 15 (28.07.2021): 3315. http://dx.doi.org/10.3390/jcm10153315.

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Cochlear implant is the method of choice for the rehabilitation of severe to profound sensorineural hearing loss. The study of the tissue response to cochlear implantation and the prevention of post-cochlear-implant damages are areas of interest in hearing protection research. The objective was to assess the efficacy of dexamethasone-eluting electrode array on endo canal fibrosis formation by three-dimensional immunofluorescence analysis in implanted Mongolian gerbil cochlea. Two trials were conducted after surgery using Mongolian gerbil implanted with dexamethasone-eluting or non-eluting intracochlear electrode arrays. The animals were then euthanised 10 weeks after implantation. The cochleae were prepared (electrode array in place) according to a 29-day protocol with immunofluorescent labelling and tissue clearing. The acquisition was carried out using light-sheet microscopy. Imaris software was then used for three-dimensional analysis of the cochleae and quantification of the fibrotic volume. The analysis of 12 cochleae showed a significantly different mean volume of fibrosis (2.16 × 108 μm3 ± 0.15 in the dexamethasone eluting group versus 3.17 × 108 μm3 ± 0.54 in the non-eluting group) (p = 0.004). The cochlear implant used as a corticosteroid delivery system appears to be an encouraging device for the protection of the inner ear against fibrosis induced by implantation. Three-dimensional analysis of the cochlea by light-sheet microscopy was suitable for studying post-implantation tissue damage.

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Ajieren, Hans, Radu Reit, Roxanne Lee, Tiffany Pham, Dongmei Shao, Kenneth Lee i Walter Voit. "Robotic Insertion Aid for Self-Coiling Cochlear Implants". MRS Advances 1, nr 1 (2016): 51–56. http://dx.doi.org/10.1557/adv.2016.71.

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ABSTRACTThis study investigates the use of shape memory polymers (SMPs) as a substrate for a self-coiling cochlear implant electrode array and investigates the self-coiling ability of a sham probe micromachined atop such a substrate. Through the use of a self-coiling cochlear implant, the capability to avoid contact with the tissue of the cochlear duct is investigated via the insertion of a dummy device into a model cochlea heated to an ambient 34 °C. Finally, a prototype straightening and insertion tool is developed for automated retraction and locking of the coiled shape into a bar geometry. Preliminary demonstration of the deployment of self-coiling cochlear implants is shown and paves the way for future studies focused on using histological analysis of the cochlear wall tissue to compare the degree of trauma resulting from linear cochlear implant arrays versus the self-coiling, non-contact probes demonstrated herein.

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Pamuk, G., A. E. Pamuk, A. Akgöz, E. Öztürk, M. D. Bajin i L. Sennaroğlu. "A study on modelling cochlear duct mid-scalar length based on high-resolution computed tomography, and its effect on peri-modiolar and mid-scalar implant selection". Journal of Laryngology & Otology 133, nr 09 (19.08.2019): 764–69. http://dx.doi.org/10.1017/s0022215119001671.

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AbstractObjectiveTo determine cochlear duct mid-scalar length in normal cochleae and its role in selecting the correct peri-modiolar and mid-scalar implant length.MethodsThe study included 40 patients with chronic otitis media who underwent high-resolution computed tomography of the temporal bone. The length and height of the basal turn, mid-modiolar height of the cochlea, mid-scalar and lateral wall length of the cochlear duct, and the ‘X’ line (the largest distance from mid-point of the round window to the mid-scalar point of the cochlear canal) were measured.ResultsCochlear duct lateral wall length (28.88 mm) was higher than cochlear duct mid-scalar length (20.08 mm) (p < 0.001). The simple linear regression equation for estimating complete cochlear duct length was: cochlear duct length = 0.2 + 2.85 × X line.ConclusionUsing the mid-scalar point as the reference point (rather than the lateral wall) for measuring cochlear duct mid-scalar length, when deciding on the length of mid-scalar or peri-modiolar electrode, increases measurement accuracy. Mean cochlear duct mid-scalar length was compatible with peri-modiolar and mid-scalar implant lengths. The measurement method described herein may be useful for pre-operative peri-modiolar or mid-scalar implant selection.

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Jackler, Robert K., Patricia A. Leake i William S. McKerrow. "Cochlear Implant Revision: Effects of Reimplantation on the Cochlea". Annals of Otology, Rhinology & Laryngology 98, nr 10 (październik 1989): 813–20. http://dx.doi.org/10.1177/000348948909801012.

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The removal of an indwelling cochlear implant electrode followed by reinsertion of a new device has been a maneuver of uncertain cosequences to the cochlea and its surviving neural population. The present study was conducted in an attempt to elucidate the factors at determine whether a reimplantation procedure will be successful. Cochlear implantation followed by explanation and subsequent implantation was performed in eight adult cats. Evaluation of cochlear histopathology suggested a significant increase in electrode insertion trauma when there was proliferation of granulation tissue in the round window area and scala tympani. In other cases, atraumatic insertion was achieved without apparent injury to the cochlea. The results of a survey of cochlear implant manufacturers and surgeons indicate that electrode replacement can usually be accomplished without adverse effects. Difficulties have been encountered, however, in moving implants with protuberant electrodes and when reimplantation was attempted on a delayed basis following explanation.

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Swain, Santosh Kumar. "Cochlear deformities and its implication in cochlear implantation: a review". International Journal of Research in Medical Sciences 10, nr 10 (27.09.2022): 2339. http://dx.doi.org/10.18203/2320-6012.ijrms20222547.

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Hearing loss is one of the world’s leading causes of chronic health conditions. Cochlea plays a vital role in the hearing mechanisms and it converts sound energy into electrical stimuli which are transmitted to the brain through the neural pathway. The human cochlea is difficult to explore because of its vulnerability and bordering bony capsule. Congenital malformation of the inner ear or cochlea is an important cause of congenital sensorineural hearing loss. The deformity of the cochlea may result from arrested development of cochlea at different stages of fetal life or from abnormal development due to genetic abnormalities. There are hair cells responsible for converting sound energy into electrical impulses. These hair cells are easily damaged, which results in permanent hearing loss. Cochlear implants are surgically implantable biomedical devices that bypass the sensory hair cells and directly stimulate the remaining fibers of the auditory nerve with an electric current. Cochlear implantation is capable of restoring a surprisingly large degree of auditory perception to patient that is suffering from severe to profoundly deaf. Children with cochlear anomalies are thought to have poorer outcomes with cochlear implantations, therefore would be poorer candidates due to their diminished ability to interpolate and use auditory information provided through a cochlear implant. Parents should be counselled to establish realistic post-implant expectations in case of children with cochlear deformity. So, patient selection has emerged as one of the most vital determinants of successful outcomes after pediatric cochlear implantation.

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Todt, I., R. Guerkov, H. B. Gehl i H. Sudhoff. "Comparison of Cochlear Implant Magnets and Their MRI Artifact Size". BioMed Research International 2020 (10.01.2020): 1–8. http://dx.doi.org/10.1155/2020/5086291.

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Introduction. Recent developments regarding cochlear implant magnets (e.g., a bipolar diametral magnet) and refined surgical techniques (e.g., implant positioning) have had a significant impact on the relation between cochlear implants and MRIs, making the reproducible visibility of cochlea and IAC possible. MRI scanning has changed from a contraindication to a diagnostic tool. Magnet artifact size plays a central role in the visual assessment of the cochlea and IAC. Objective. The aim of this study is to compare the CI magnet-related maximum artifact sizes of various cochlea implant systems. Materials and Methods. We performed an in vivo measurement of MRI artifacts at 1.5 and 3 Tesla with three cochlear implant magnet systems (AB 3D, Medel Synchrony, and Oticon ZTI). The implant, including the magnet, was positioned with a head bandage 7.0 cm and 120° from the nasion, external auditory canal. We used a TSE T2w MRI sequence on the axial and coronal plains and compared the artifacts in two volunteers for each tesla strength. Results. Intraindividual artifact size differences between the three magnets are smaller than interindividual maximum artifact size differences. 3 T MRI scans, in comparison to 1.5 T MRI scans, show a difference between soft artifact areas. Conclusion. We observed no major difference between maximum implant magnet artifact sizes of the three implant magnet types.

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AKKAPLAN, Selvet, Merve ÖZBAL BATUK, Hilal DİNÇER D’ALESSANDRO i Gonca SENNAROĞLU. "İnkomplet partisyon tip II bulunan unilateral ve bimodal koklear implant kullanıcılarının konuşma, uzaysal algı ve işitme kalitesinin değerlendirilmesi". Turkish Journal of Audiology And Hearing Research 4, nr 3 (grudzień 2021): 63–68. http://dx.doi.org/10.34034/tjahr.977893.

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Evaluation of the speech, spatial and qualities of hearing in unilateral and bimodal cochlear implant users with incomplete partition type II Objective: The aim of this study was to perform a scale-based assessment of the hearing abilities of cochlear implant users with IP type II malformation and normal cochlea, including discrimination, orientation, and positioning of speech and environmental sounds in their environment. Material and Methods: A total of 30 cochlear implant users, 15 participants with IP-II inner ear anomalies and 15 participants with normal cochlea, aged 18-55 years were included in this study. All participants included in the study are unilateral CI and bimodal users. Participants were assessed using the Speech, Spatial, and Hearing Qualities Scale (SSQ). Results: When cochlear implant users with IP-II malformations and cochlear implant users with normal cochlea individually scored auditory abilities, the results were similar. It was observed that bimodal listeners tended to have all subdomains and overall SSQ scores compared to use of unilateral CI. Conclusion: It is very important to benefit from the advantages of binaural hearing in hearing sounds. It is thought that the use of scales as well as routine audiological evaluation batteries in the follow-up processes of cochlear implant users will be beneficial for audiologists. Keywords: Cochlear implant, speech perception, spatial perception, hearing quality

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Zahara, Devira, Rima Diana Dewi, Askaroellah Aboet, Fikri Mirza Putranto, Netty Delvrita Lubis i Taufik Ashar. "Variations in Cochlear Size of Cochlear Implant Candidates". International Archives of Otorhinolaryngology 23, nr 02 (24.10.2018): 184–90. http://dx.doi.org/10.1055/s-0038-1661360.

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Introduction The cochlear anatomy varies in each individual, and that has an impact on decisions regarding the insertion of electrodes. The measurement of the cochlear size is the routine examination required to choose the proper cochlear implant (CI) electrodes. Objective To acquire normative data on the size of the cochlea (length, width, height, scala timpani [ST] height, cochlear duct length [CDL]) of CI candidates in Medan, Indonesia. Methods This descriptive study was conducted based on high-resolution computed tomography (HRCT) temporal bone data and on HRCT temporal data manipulated to reconstruct three-dimensional (3D) multiplanar images with OsiriX MD DICOM Viewer version 9.5.1 (Pixmeo SARL, Bernex, Geneva, Switzerland) viewer of 18 patients (36 ears) who were CI candidates in Medan, Indonesia, in order to determine cochlear length (A), cochlear width, cochlear height, ST height and CDL, calculated through a simple mathematical function. Results The average cochlear length (A) was 8.75 mm (standard deviation [SD] = 0.31 mm); the average cochlear width was 6.53 mm (SD = 0.35 mm); the average cochlear height was 3.26 mm (SD = 0.24 mm) and the average ST height at the basal cochlea was 1.00 mm (SD = 0.1 mm); and 0.71 mm (SD = 0.1 mm) at the half turn of cochlea. The average total CDL was 32.45 mm (SD = 1.31 mm; range: 30.01–34.83 mm). Conclusion The cochlear size varies in each individual; therefore, the temporal bone measurement of CI candidates using HRCT is essential: for the selection of suitable implant electrodes; to minimize cochlear damages at the insertion of the electrode arrays; and to maximize the hearing improvements.

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Rozprawy doktorskie na temat "Cochlear implant"

Newbold, Carrie. "Electrode tissue interface : development and findings of an in vitro model /". Connect to thesis, 2006. http://repository.unimelb.edu.au/10187/1692.

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In the period immediately following the implantation of a cochlear implant electrode array within the cochlear environment, the power required to stimulate the auditory nerve at preset current levels increases. This rise is due to increases in electrode impedance which in turn is suggested to be a result of tissue growth around the electrode array. The foreign body response initiated by the immune system encapsulates the array in a matrix of fibrous tissue, separating the electrode array from the rest of the body. A second change in electrode impedance occurs with the onset of electrical stimulation. A transitory reduction in impedance has been recorded in animals and humans after stimulation of electrodes. Impedance returns to pre-stimulation levels following the cessation of stimulation. It was suggested that these changes in impedance with stimulation were also related to the tissue growth around the electrode array. A more thorough understanding of the interface was required to ascertain these concepts.

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Wolmarans, Hendrik Petrus. "Cochlear implant speech processing, based on the cochlear travelling wave". Diss., Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-01242006-112642.

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Oosthuizen, Ilze. "Bilateral processing benefit in sequentially implanted adult cochlear implant users". Diss., University of Pretoria, 2011. http://hdl.handle.net/2263/30304.

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Bilateral cochlear implantation is accepted medical practice since 2008 in clinically suitable adults and children to enhance bilateral processing benefits. Bilateral implantation may lead to the restoration of some bilateral hearing advantages, such as improved speech recognition in noise, localisation, head shadow effect, summation, and squelch. The majority of the advantages stated in literature, though, are characteristic of the simultaneously implanted cochlear implant population. Simultaneous implantation is not yet a reality in South Africa due to funding constraints, therefore determining the bilateral processing abilities in sequentially implanted adults is essential. Determining bilateral processing benefits achievable with sequential implantation could result in evidence-based recommendations in terms of candidacy considerations, surgery protocols, motivations for medical aid funding for simultaneous cochlear implantation, and relevant measures to determine the bilateral processing benefit attainable. Furthermore, it might enhance audiologists‟ insight regarding post-implantation performance of sequentially implanted patients and enable them to counsel prospective candidates realistically. The aaim of this study was to determine the bilateral benefit attained by sequentially implanted adults. A quantitative, cross-sectional research approach was followed in a one group post-test-only exploratory research design. A purposive convenient sampling method with specified selection criteria was used to select 11 adult clients of an established cochlear implant programme in Pretoria. Tests of sound localisation in the horizontal plane and speech perception in noise were performed. During the test of sound localisation, performance with only the first or only the second implant was found to be very similar. For the majority of participants the second cochlear implant (CI 2) was the superior performing implant during xviii speech perception in noise testing, in spatially separated speech and noise conditions where noise was directed to the first implant, as well as in spatially coincident speech and noise. A statistical significant bilateral benefit (p < 0.05) was attained by sequentially implanted adults for sound localisation. A bilateral benefit for speech perception in noise was observed when noise was directed to the first implant and in the diotic listening condition with average benefits of 1.69 dB and 0.78 dB, respectively. It was not statistically significant (p > 0.05), however, and was smaller than bilateral benefit values achieved by simultaneously implanted adults in previous studies. The head shadow effect at 180° was found to be the strongest and most robust bilateral spatial benefit. Squelch and summation benefit values ranged from negative values to 2 dB and 6 dB, respectively. This corresponded with values found in previous studies. The improvement in speech perception in spatially distinct speech and noise from adding the ear with a better SNR (signal to noise ratio) indicated that the contribution of CI 2 seems to be greater than that of CI 1 for bilateral spatial benefit. It can be concluded that adults with sequential implants may achieve some extent of bilateral benefit even with many years of unilateral implant use, when speech processors differ, when the second implant is done ≥ 10 years after the first implant, and in cases of prelingual deafness. A key benefit of sequential implantation appears to be related to the advantage of having hearing on both sides so that the ear with the more favourable environmental signalto-noise ratio is always available. AFRIKAANS : Bilaterale kogleêre inplanting is sedert 2008 aanvaarde mediese praktyk vir klinies geskikte volwassenes en kinders, ten einde bilaterale prosesseringsvoordeel te verhoog. Bilaterale inplanting kan lei tot die herstel van sommige van die voordele van bilaterale gehoor, soos verbeterde spraakherkenning in lawaai, klanklokalisering, die kopskadueffek, sommering en selektiewe onderdrukking (“squelch”). Die meeste van die voordele wat in die literatuur bespreek word, is egter kenmerkend van dié persone by wie twee kogleêre inplantings gelyktydig gedoen is. Gelyktydige inplanting is as gevolg van beperkte befondsing nog nie in Suid-Afrika 'n werklikheid nie, daarom is dit noodsaaklik om te bepaal watter bilaterale prosesseringsvoordele by opeenvolgend-geïnplanteerde volwassenes voorkom. Die bepaling van watter bilaterale prosesseringsvoordele met opeenvolgende inplanting bereik kan word, sou kon lei tot getuienis-gebaseerde aanbevelings met betrekking tot besluite oor die geskiktheid van kandidate, protokol vir sjirurgie, motiverings vir die befondsing van gelyktydige kogleêre inplantings deur mediese voorsorgfondse, en toepaslike maatstawwe om te bepaal watter mate van bilaterale prosesseringsvoordeel haalbaar sou wees. Dit sou verder oudioloë se insig kon verbreed met betrekking tot die na-operatiewe prestasie van opeenvolgend-geïnplanteerde persone en hulle sodoende in staat stel om voornemende kandidate van realistiese raad te bedien. Die doel van hierdie studie was om te bepaal wat die bilaterale prosesseringsvoordele is wat deur opeenvolgend-geïnplanteerde volwassenes verkry kan word. 'n Kwantitatiewe navorsingsbenadering met 'n dwarsprofiel van „n enkelgroep is gevolg, met 'n post-toets verkennende navorsingsontwerp. 'n Doelgerigte gerieflikheidssteekproef met 'n gespesifiseerde seleksiekriteria is gebruik om 11 volwasse kliënte van 'n gevestigde kogleêre inplantprogram in Pretoria te selekteer. Klanklokalisering in die horisontale vlak en die waarneming van spraak in lawaai is getoets. Tydens die toets vir klanklokalisering is gevind dat prestasie met slegs die eerste of slegs die tweede inplanting soortgelyk was. Vir die meeste deelnemers aan die studie het die tweede kogleêre inplanting (KI 2) die beste prestasie gelewer tydens spraakwaarneming in lawaai, in omstandighede waar spraak en lawaai ruimtelik geskei is en die lawaai op die eerste inplanting gerig is, asook in omstandighede waar spraak en lawaai ruimtelik saamvoorkomend aangebied is. 'n Statisties beduidende bilaterale voordeel (p < 0.05) is deur opeenvolgend-geïnplanteerde volwassenes vir klanklokalisering behaal. 'n Bilaterale voordeel vir spraakwaarneming in lawaai is waargeneem waar lawaai op die eerste inplanting gerig is en ook in diotiese luistertoestande, met 'n gemiddelde voordeel van 1.69 dB en 0.78 dB, onderskeidelik. Dit was egter nie statisties beduidend nie en was ook kleiner as die bilaterale voordeelwaardes wat in vorige studies deur gelyktydig-geïnplanteerde volwassenes behaal is. Die kopskadu-effek by 180° was die sterkste en mees robuuste bilaterale ruimtelike voordeel. Voordeelwaardes vir selektiewe onderdrukking en sommering het gewissel van negatiewe waardes tot 2 dB en 6 dB onderskeidelik. Dit stem ooreen met waardes wat in vorige studies gevind is. Die verbetering in spraakwaarneming in ruimtelik geskeide spraak en lawaai wat verkry is deur die oor met 'n beter STR (sein-tot-ruis ratio) by te voeg, het daarop gedui dat die bydrae van KI 2 tot bilaterale ruimtelike voordeel waarskynlik groter as die bydrae van KI 1 is. Die gevolgtrekking kan gemaak word dat volwassenes met opeenvolgende inplantings 'n mate van bilaterale voordeel verkry selfs na vele jare van unilaterale inplantingsgebruik, wanneer die spraakprosesseerders in die twee inplantings van mekaar verskil, wanneer die tweede inplanting ≥ 10 jaar na die eerste plaasvind, en in gevalle van prelinguale doofheid. 'n Sleutelvoordeel van opeenvolgende inplanting hou klaarblyklik verband met die voordeel van gehoor aan albei kante te hê sodat die oor met die gunstigste sein-tot-lawaai ratio altyd beskikbaar is.
Dissertation (MCommunication Pathology)--University of Pretoria, 2012.
Speech-Language Pathology and Audiology
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Looi, V. "Music Perception of Cochlear Implant Users". Thesis, University of Canterbury. Department of Communication Disorders, 2006. http://hdl.handle.net/10092/2200.

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Graser, Peter. "Sprachentwicklungsstörungen bei Kindern mit Cochlear Implant". Heidelberg Winter, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?id=2935522&prov=M&dok_var=1&dok_ext=htm.

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Graser, Peter. "Sprachentwicklungsstörungen bei Kindern mit Cochlear Implant /". Heidelberg : Winter, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2935522&prov=M&dok_var=1&dok_ext=htm.

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Baker, Michael W. (Michael Warren) 1977. "A low-power cochlear implant system". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40494.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.
Includes bibliographical references (p. 171-179).
Cochlear implants, or bionic ears, restore hearing to the profoundly deaf by bypassing missing inner-ear hair cells in the cochlea and electrically stimulating the auditory nerve. For miniaturized cochlear implants, including behind-the-ear (BTE) models, power consumption is the chief factor in determining cost and patient convenience. This thesis reports on the design of a low-power bionic ear system by addressing three critical signal and power processing subsystems in low-cost CMOS ICs. First, the design of a low-power current-mode front-end for subminiature microphones demonstrates 78dB dynamic range performance with attention to RF noise and supply immunity. Second, hearing-impaired patients need strategies that decide intelligently between listening conditions in speech or noise. This work describes an automatic gain control (AGC) design which uses programmable hybrid analog-digital current-mode feedback to implement a dual-loop strategy, a well-known algorithm for speech in noisy environments. The AGC exhibits level-invariant. stability, programmable time constants and consumes less than 36pW. Third, a feedback-loop technique is explored for analyzing and designing RF power links for transcutaneous bionic ear systems.
(cont.) Using feedback tools to minimize algebraic manipulations, this work demonstrates conditions for optimal voltage and power transfer functions. This theory is applied to a bionic implant system designed for load power consumptions in the 1mW - 10mW range, a low-power regime not significantly explored in prior designs. Link efficiencies of 74% and 54% at 1-mm and 10-mm coil separations, respectively, are measured, in good agreement with theoretical predictions. A full cochlear implant system with signal and power processing is explored incorporating the front-end, AGC, and RF power link, as well as analog signal processing channels. This design uses channel data to feedforward program the just-needed electrode power level. My implant system consumes 3mW of power for all audio processing and a stimulation power of 1mW. A fixed-power version of this system dissipates 2.2mW for 1mW of internal stimulation power. As many commercial systems with similar specifications consume 40mW - 80mW, this effort promises a significant reduction in cochlear implant power consumption and cost.
by Michael W. Baker.
Ph.D.

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Cooper, Huw R. "Auditory grouping in cochlear implant listeners". Thesis, Aston University, 2008. http://publications.aston.ac.uk/12317/.

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This thesis describes a series of experiments investigating both sequential and concurrent auditory grouping in implant listeners. Some grouping cues used by normal-hearing listeners should also be available to implant listeners, while others (e.g. fundamental frequency) are unlikely to be useful. As poor spectral resolution may also limit implant listeners’ performance, the spread of excitation in the cochlea was assessed using Neural Response Telemetry (NRT) and the results were related to those of the perceptual tasks. Experiment 1 evaluated sequential segregation of alternating tone sequences; no effect of rate or evidence of perceptual ambiguity was found, suggesting that automatic stream segregation had not occurred. Experiment 2 was an electrode pitch-ranking task; some relationship was found between pitch-ranking judgements (especially confidence scores) and reported segregation. Experiment 3 used a temporal discrimination task; this also failed to provide evidence of automatic stream segregation, because no interaction was found between the effects of sequence length and electrode separation. Experiment 4 explored schema-based grouping using interleaved melody discrimination; listeners were not able to segregate targets and distractors based on pitch differences, unless accompanied by substantial level differences. Experiment 5 evaluated concurrent segregation in a task requiring the detection of level changes in individual components of a complex tone. Generally, large changes were needed and abrupt changes were no easier to detect than gradual ones. In experiment 6, NRT testing confirmed substantially overlapping simulation by intracochlear electrodes. Overall, little or no evidence of auditory grouping by implant listeners was found.

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Labuschagne, Ilse Bernadette. "Timbre perception of cochlear implant users". Diss., University of Pretoria, 2011. http://hdl.handle.net/2263/31130.

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The timbre perception of cochlear implantees (CI) is poor compared to normal hearing (NH) listeners. The cues that are normally transmitted to NH listeners may be less salient or even absent for CI users. From the literature, two spectral (brightness (Tb) and irregularity (IRR)) and two temporal timbre parameters (log rise-time (LRT) and sustain/decay (S/D) parameter (n)) have been identified as important timbre parameters. Each of these parameters was extracted for a set of thirteen instruments. Sounds could be resynthesized according to the specific timbre parameter set. The variation of loudness, pitch and perceived duration as functions of the timbre parameters were investigated to provide systematic balancing methods. The just-noticeable differences (JNDs) were obtained for each of the parameters for thirteen instruments for NH listeners and a reduced instrument set of nine instruments for the CI users using a 1-up, 2-down, two-alternative, forced choice procedure. From the JNDs, predicted confusion matrices were constructed. From the confusion matrices, a feature information transmission analysis (FITA) indicated the salience of each of the parameters and NH and CI results could be compared.
Dissertation (MEng)--University of Pretoria, 2011.
Electrical, Electronic and Computer Engineering
MEng
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Tucker, Eliza M. "Tinnitus in cochlear implantees : cognitive behavioural therapy for cochlear implant users". Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/359783/.

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Background to the study: Cochlear implants (CI) can help to suppress tinnitus and often make existing tinnitus more bearable. However, a number of patients still suffer from tinnitus afterwards. In some cases the implantation makes existing tinnitus worse, or tinnitus may occur as a result of cochlear implantation. Because of the inconclusive aetiology of tinnitus it is difficult to treat its effects. So far, one of the most popular treatments for tinnitus is the widely used Cognitive Behavioural Therapy (CBT), which aims to influence dysfunctional emotions, behaviours and cognitions though a goal-orientated, systematic procedure. CBT aims to minimize the side-effects of tinnitus and help to manage it in a more efficient way. CBT has been investigated in several studies and shows promising results in reducing the debilitating effect of tinnitus. CBT has not yet been used specifically for, or investigated in, relation to treating CI users suffering from tinnitus. Aims and outline of the study: Our research aimed to investigate CBT’s effectiveness for cochlear implant users. Using a randomized control trial, we investigated whether two-hour Tinnitus Workshops for the control group were as equally as effective as CBT for the research group. We also explored if either type of treatment for cochlear implant users needed any modifications to make them more suitable for this group of tinnitus sufferers. Using Open Questions, we investigated tinnitus in cochlear implant users. We analysed the Open Questions from both groups, creating a profile of a typical cochlear implant user who suffers from tinnitus, and we also explored whether both interventions (Tinnitus Workshop or CBT) were suitable for this kind of patient. Data was gathered, pre- and post-interventions, by questionnaires; these were Tinnitus Questionnaires (TQ), Visual Analogue Scale (VAS), Quality of Life Short Form 36 Health Survey (SF-36) and Hospital Anxiety and Depression Scale (HADS). Results: In the control group, we found no significant differences between the TQ scores pre- and post-intervention. VAS scores post-intervention were lower than pre-intervention, indicating some improvement in individual tinnitus perception; however, the difference was not significant. In the research group, we found small, but not significant, differences in both TQ pre- and post-intervention (z =1.83, p>.05) and in VAS (z=0.14, p>.05). No significant differences were found between the control and the research group pre- and post-intervention. Conclusions: The questionnaires used in this study, such as TQ or VAS, showed a decrease in general tinnitus distress, but a larger-sized sample group may be needed for greater statistical certainty. The results from the Open Questions showed that cochlear implant users were affected by tinnitus in a similar way to non-cochlear implant users. Overall, both interventions need further, small modifications and adjustments to their protocols in order to be more effective for this type of tinnitus sufferer.

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Książki na temat "Cochlear implant"

Lehnhardt, Ernst, i Michael S. Hirshorn, red. Cochlear Implant. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8.

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Ernst, Arne, Rolf-Dieter Battmer i Ingo Todt. Cochlear Implant heute. Heidelberg: Springer, 2009.

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ed, Balkany Thomas J., red. The Cochlear implant. Philadelphia: Saunders, 1986.

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The University of Melbourne-nucleus multi-electrode cochlear implant. Basel: Karger, 1987.

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Pauka, Charles K. Place-pitch and vowel-pitch comparisons in cochlear implant patients using the Melbourne-Nucleus cochlear implant. Ashford, Kent: Headley Brothers, 1989.

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Umat, Cila, i Rinze Anthony Tange. Cochlear implant research updates. Rijeka, Croatia: InTech, 2012.

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Lehnhardt, Ernst, i Bodo Bertram, red. Rehabilitation von Cochlear-Implant-Kindern. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76897-2.

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Riski, Maureen Cassidy. Abby gets a cochlear implant. Ottsville, Pennsylvania]: [Cassidy Publishing], 2008.

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1935-, Clark Graeme, Tong Yit C i Patrick James F, red. Cochlearprostheses. Edinburgh: Churchill Livingstone, 1990.

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International Cochlear Implant Conference. (8th 2004 Indianapolis, Ind.). Cochlear implants: Proceedings of the VIII International Cochlear Implant Conference held in Indianapolis, Indiana, USA between 10 and 13 May 2004. Redaktor Miyamoto Richard T. Amsterdam: Elsevier, 2004.

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Części książek na temat "Cochlear implant"

Laszig, R., i Th Luetgebrune. "Klinische Topodiagnostik der Ertaubung". W Cochlear Implant, 1–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_1.

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Schultz-Coulon, H. J. "Linguistische Grundbegriffe — Was ist Sprache?" W Cochlear Implant, 63–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_10.

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Hase, U. "Pädagogisch-psychologische Nachsorge". W Cochlear Implant, 71–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_11.

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Petersen, A. "Grundsätzliches zum Ablesen". W Cochlear Implant, 74–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_12.

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Hase, B. "Nonverbale Anteile in Kommunikation und Verständigung". W Cochlear Implant, 78–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_13.

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Laszig, R., i K. Mohme-Hesse. "Trainingsprogramm für Cochlear Implant-Patienten". W Cochlear Implant, 82–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_14.

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Willenbockel, Ch, i M. Lambusch. "Audiovisuelles Selbsttraining". W Cochlear Implant, 92–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_15.

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Hartmann, R., i R. Klinke. "Impulsmuster des Hörnerven bei akustischer und elektrischer Stimulation". W Cochlear Implant, 94–100. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_16.

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Battmer, R. D. "Das 22-kanalige Cochlear Implant-System nach Clark/NUCLEUS — eine Systembeschreibung". W Cochlear Implant, 101–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_17.

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Laubert, A. "NUCLEUS- und alternative Systeme". W Cochlear Implant, 107–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72819-8_18.

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Streszczenia konferencji na temat "Cochlear implant"

Kong, Fanhui, Nengheng Zheng, Xianren Wang, Hao He, Jan W. H. Schnupp i Qinglin Meng. "Cochlear-implant Listeners Listening to Cochlear-implant Simulated Speech". W INTERSPEECH 2023. ISCA: ISCA, 2023. http://dx.doi.org/10.21437/interspeech.2023-554.

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Kukushev, G. "Navigated Cochlear Implant Electrode". W Abstract- und Posterband – 89. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Forschung heute – Zukunft morgen. Georg Thieme Verlag KG, 2018. http://dx.doi.org/10.1055/s-0038-1640437.

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Brademann, G., B. Böhnke, A. Mewes, M. Hey i P. Ambrosch. "Longitudinalstudie der Cochlea-Implantat-Versorgung am Cochlear Implant Centrum CIC Schleswig-Kiel". W Abstract- und Posterband – 89. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Forschung heute – Zukunft morgen. Georg Thieme Verlag KG, 2018. http://dx.doi.org/10.1055/s-0038-1640267.

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Narasimhan, Narendran, Katherine E. Riojas, Trevor L. Bruns, Jason E. Mitchell, Robert J. Webster i Robert F. Labadie. "A Simple Manual Roller Wheel Insertion Tool for Electrode Array Insertion in Minimally Invasive Cochlear Implant Surgery". W 2019 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/dmd2019-3249.

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Image-guided, minimally-invasive cochlear implant surgery is a novel “keyhole” surgical approach for placing a cochlear implant electrode array eliminating the need for a wide-field mastoidectomy approach. Image guidance is used for path planning which is followed by the construction of a customized micro-stereotactic frame to drill a narrow channel from the skull surface to the cochlea. Herein, we present an insertion tool that uses roller wheels to advance the electrode array through the narrow tunnel and into the cochlea. Testing in a phantom revealed that when compared to insertions with surgical forceps, the new insertion tool was on average 26s faster, produced complete insertions more often (i.e. in 6/6 trials, vs. 1/6), and reduced array buckling (0/6 trials vs. 5/6). The tool provides a viable solution to complete the last step of this novel, minimally-invasive procedure. It also provides the advantage over previously developed manual insertion tools of enabling the surgeon to blindly actuate the roller wheel tool to advance the electrode into the tunnel. This allows the surgeon to visualize and guide insertion into the cochlea from a more advantageous visual perspective.

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Eid, M., M. Elshazly, H. Abdelazim, H. Abdelghaffar i H. S.Mostafa. "Migration of Cochlear Implants in Cochlear Implantation and its Effect on Implant Performance". W Abstract- und Posterband – 91. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Welche Qualität macht den Unterschied. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1711089.

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Swanson, Brett, Erika van Baelen, Mark Janssens, Michael Goorevich, Tony Nygard i Koen van Herck. "Cochlear Implant Signal Processing ICs". W 2007 IEEE 29th Custom Integrated Circuits Conference. IEEE, 2007. http://dx.doi.org/10.1109/cicc.2007.4405768.

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Schmidtmayer, U., A. Giourgas, C. Weber, T. Lenarz i A. Lesinski-Schiedat. "Cochlear implant in acoustic neuroma". W Abstract- und Posterband – 90. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Digitalisierung in der HNO-Heilkunde. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-1686499.

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Cury, Joaquin, Xiaodong Tan i Claus-Peter Richter. "Towards an optical cochlear implant". W Optogenetics and Optical Manipulation 2023, redaktorzy Samarendra K. Mohanty, Anna W. Roe i Shy Shoham. SPIE, 2023. http://dx.doi.org/10.1117/12.2661870.

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Comejo-Cruz, JM, P. Granados-Trejo i N. Castaneda-Villa. "Electrical Cochlear Response Consistency from different Cochlear Implant Users". W 2021 43rd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). IEEE, 2021. http://dx.doi.org/10.1109/embc46164.2021.9629821.

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Brademann, G., B. Böhnke, A. Mewes, M. Hey i P. Ambrosch. "Longitudinal follow-up Evaluation of Cochlea Implant Rehabilitation at Cochlear Implant Center CIC Schleswig-Kiel". W Abstract- und Posterband – 89. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Forschung heute – Zukunft morgen. Georg Thieme Verlag KG, 2018. http://dx.doi.org/10.1055/s-0038-1640268.

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Raporty organizacyjne na temat "Cochlear implant"

Ross, Carol. Some effects of cochlear implant use on loudness modulation. Portland State University Library, styczeń 2000. http://dx.doi.org/10.15760/etd.5408.

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Electrical Stimulation for Cochlear Implant Selection and Rehabilitation. Rockville, MD: American Speech-Language-Hearing Association, marzec 1992. http://dx.doi.org/10.1044/policy.glksps1992-00033.

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Cochlear Implants. Rockville, MD: American Speech-Language-Hearing Association, 2004. http://dx.doi.org/10.1044/policy.tr2004-00041.

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