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Middle ear implant

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https://www.readbyqxmd.com/read/29332169/measuring-cochlear-duct-length-in-asian-population-worth-giving-a-thought
#1
Mohnish Grover, Shitanshu Sharma, Shashank Nath Singh, Tanmaya Kataria, Rajendra Singh Lakhawat, Man Prakash Sharma
INTRODUCTION: The anatomy of the cochlea forms the basis for a successful cochlear implantation. Cochlear duct length (CDL) is defined as the length of the scala media as measured from the middle of the round window to helicotrema. Preoperative measurement of CDL is particularly important when precise intracochlear electrode array placement is desired. It can be done both histologically and radiologically. Preoperative high-resolution computed tomography (HRCT) scan which forms an integral part of cochlear implant workup is a useful tool to calculate CDL using 3D reconstructions...
January 13, 2018: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29315183/middle-fossa-approach-for-cochlear-implantation
#2
Wojciech Gawęcki, Michał Karlik, Łukasz Borucki, Maciej Wróbel, Olgierd Maciej Stieler, Witold Szyfter
OBJECTIVE: To present qualification criteria, surgery, and results of cochlear implantation via the middle fossa approach. STUDY DESIGN: A retrospective analysis of medical charts of patients. SETTING: Cochlear implant program in academic medical center. PATIENTS: Six adults after middle ear surgery due to chronic otitis media with bilateral deafness or profound hearing loss. INTERVENTION: Analysis aimed to identify patients qualified for cochlear implantation via middle fossa approach and to present surgery and result...
February 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29279725/tympanoplasty-news-and-new-perspectives
#3
REVIEW
Marcus Neudert, Thomas Zahnert
Techniques and biomaterials for reconstructive middle ear surgery are continuously and steadily developing. At the same time, clinical post-surgery results are evaluated to determine success or failure of the therapy. Routine quality assessment and assurance is of growing importance in the medical field, and therefore also in middle ear surgery. The exact definition and acquisition of outcome parameters is essential for both a comprehensive and detailed quality assurance. These parameters are not the audiological results alone, but also additional individual parameters, which influence the postoperative outcome after tympanoplasty...
2017: GMS Current Topics in Otorhinolaryngology, Head and Neck Surgery
https://www.readbyqxmd.com/read/29279724/implantable-hearing-devices
#4
REVIEW
Matthias Tisch
Combined hearing loss is an essential indication for implantable hearing systems. Depending on the bone conduction threshold, various options are available. Patients with mild sensorineural deafness usually benefit from transcutaneous bone conduction implants (BCI), while percutaneous BCI systems are recommended also for moderate hearing loss. For combined hearing losses with moderate and high-grade cochlear hearing loss, active middle ear implants are recommended. For patients with incompatibilities or middle ear surgery, implants are a valuable and proven addition to the therapeutic options...
2017: GMS Current Topics in Otorhinolaryngology, Head and Neck Surgery
https://www.readbyqxmd.com/read/29273266/in-vitro-and-in-vivo-measurement-of-the-animal-s-middle-ear-acoustical-response-by-partially-implantable-fiber-optic-sensing-system
#5
Zoran Djinović, Robert Pavelka, Miloš Tomić, Georg Sprinzl, Hanns Plenk, Udo Losert, Helga Bergmeister, Roberto Plasenzotti
The main obstacle in realization of a totally implantable hearing aid is a lack of reliable implantable microphone. In this paper we have described a potentially miniature fiber-optic vibrometer based on a modified Michelson interferometer, designed to serve as a middle-ear microphone for totally implantable cochlear- or middle-ear hearing aids. A model of the sensing system was used for in-vitro and in-vivo investigation of acoustical response of sheep's middle-ear ossicles. Surgical and implantation procedure of introducing the sensing optical fiber into the middle-ear and its aiming at the incus was investigated and described here in detail...
December 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29238678/a-study-of-effect-of-consanguinity-on-cochlear-morphology-in-patients-with-congenital-bilateral-profound-sensorineural-hearing-loss
#6
Y Kavitha, K Sabarigirish, Upendra Kumar Joish, Sanjeev Saxena, Angshuman Dutta
Consanguinity has been considered as one of the risk factors predisposing to the development of congenital hearing loss. Effect of consanguinity on cochlear morphology has been subject of speculation, though many studies have provided insight into functional aspect of cochlea. This study was conducted to know the effect of consanguinity on cochlear morphology, if any. A prospective, observational study, including prelingually deaf children with bilateral profound sensorineural hearing loss who are registered as candidates for cochlear implantation at a tertiary care centre, was conducted...
December 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/29227448/cochlear-implantation-in-chronic-otitis-media-with-cholesteatoma-and-open-cavities-long-term-surgical-outcomes
#7
Ashish Vashishth, Andrea Fulcheri, Sampath Chandra Prasad, Manjunath Dandinarasaiah, Antonio Caruso, Mario Sanna
OBJECTIVES: To evaluate the long-term surgical outcomes of cochlear implantation (CI) in chronic otitis media (COM) with cholesteatoma and open cavities using subtotal petrosectomy (STP). To review device explantation (DE) patients and reimplantation considerations. STUDY DESIGN: Retrospective review. SETTING: Otology and skull base center. PATIENTS AND METHODS: Charts of 35 patients (36 ears) with COM with cholesteatoma, including open cavities, who underwent CI were reviewed for surgical outcomes and DE...
January 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29214174/feasibility-of-round-window-stimulation-by-a-novel-electromagnetic-microactuator
#8
Wouter Johannes van Drunen, Mathias Mueller, Anatoly Glukhovskoy, Rolf Salcher, Marc Christopher Wurz, Thomas Lenarz, Hannes Maier
Introduction: Most implantable hearing aids currently available were developed to compensate the sensorineural hearing loss by driving middle ear structures (e.g., the ossicles). These devices are successfully used in round window (RW) stimulation clinically, although this was initially not the intended use. Here, a novel microactuator, specifically designed for RW stimulation, was tested in human temporal bones to determine actuator performance and applicability. Methods: Stapes footplate response to RW stimulation was determined experimentally in human temporal bones and the obtained sound pressure output level was estimated...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29210943/survey-of-the-american-neurotology-society-on-cochlear-implantation-part-2-surgical-and-device-related-practice-patterns
#9
Matthew L Carlson, Brendan P O'Connell, Christine M Lohse, Colin L Driscoll, Alex D Sweeney
OBJECTIVE: To examine surgical and device-related cochlear implant practice patterns across centers in the United States. METHODS: Cross-sectional survey of the American Neurotology Society (ANS). RESULTS: A total of 81 surveys were returned from ANS members who report regular involvement in cochlear implant care. Overall there was a broad distribution in age and clinical experience, with most respondents reporting Accreditation Council for Graduate Medical Education (ACGME) accreditation in neurotology and employment at an academic center...
November 28, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29209853/3d-endoscopic-ear-surgery-a-clinical-pilot-study
#10
Daniele Bernardeschi, Ghizlene Lahlou, Daniele De Seta, Francesca Yoshie Russo, Isabelle Mosnier, Olivier Sterkers
OBJECTIVE: To evaluate the feasibility and efficacy of a new high-resolution 3D endoscope in endoscopic ear and lateral skull base surgery. METHODS: Eight patients, five women and three men, were included in this clinical pilot prospective study. Their age was 38 ± 17.3 years (mean ± SD, range 17-54 years). The right side was involved in five cases, and the left side in three cases. There were three cases of chronic otitis, one case of cholesteatoma of the external auditory canal, one case of otosclerosis, one case of cochlear implant surgery, and two cases of stage 2 vestibular schwannoma operated on with a retrosigmoid approach to preserve hearing...
December 5, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29186936/endoscope-assisted-cochlear-implantation
#11
Enis Alpin Güneri, Yüksel Olgun
Objectives: Our aim was to present our endoscope-assisted cochlear implantation (CI) technique, in which the middle ear landmarks were identified through the facial recess exposure by using an endoscopic view without elevating the tympanic annulus. The secondary goal was to assess whether the situation of difficult surgical exposure could be predicted by evaluating preoperative axial computed tomography (CT) examinations. Methods: CT examinations and surgical outcomes of endoscope-assisted CI surgeries were analyzed...
December 1, 2017: Clinical and Experimental Otorhinolaryngology
https://www.readbyqxmd.com/read/29161987/encoding-a-melody-using-only-temporal-information-for-cochlear-implant-and-normal-hearing-listeners
#12
Ann E Todd, Griet Mertens, Paul Van de Heyning, David M Landsberger
One way to provide pitch information to cochlear implant users is through amplitude-modulation rate. It is currently unknown whether amplitude-modulation rate can provide cochlear implant users with pitch information adequate for perceiving melodic information. In the present study, the notes of a song were encoded via amplitude-modulation rate of pulse trains on single electrodes at the apex or middle of long electrode arrays. The melody of the song was either physically correct or modified by compression or expansion...
January 2017: Trends in Hearing
https://www.readbyqxmd.com/read/29158536/validation-of-methods-for-prediction-of-clinical-output-levels-of-active-middle-ear-implants-from-measurements-in-human-cadaveric-ears
#13
Martin Grossöhmichen, Bernd Waldmann, Rolf Salcher, Nils Prenzler, Thomas Lenarz, Hannes Maier
Today, the standard method to predict output levels of active middle ear implants (AMEIs) before clinical data are available is stapes vibration measurement in human cadaveric ears, according to ASTM standard F2504-05. Although this procedure is well established, the validity of the predicted output levels has never been demonstrated clinically. Furthermore, this procedure requires a mobile and visually accessible stapes and an AMEI stimulating the ossicular chain. Thus, an alternative method is needed to quantify the output level of AMEIs in all other stimulation modes, e...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29122427/transcanal-endoscopic-ear-surgery-for-perilymphatic-fistula-after-electric-acoustic-stimulation
#14
Ryotaro Omichi, Shin Kariya, Yukihide Maeda, Kazunori Nishizaki
Transcanal endoscopic ear surgery (TEES) will become a very useful therapeutic option. A perilymphatic fistula (PLF) is defined as sudden sensorineural hearing loss and/or vertigo caused by leakage of the perilymph through a fistula from the oval window and/or round window. We report a case of PLF after electric acoustic stimulation (EAS), a kind of cochlear implant, successfully treated by TEES. A 38-year-old man presented to our hospital with vertigo and hearing loss (HL). His vertigo was induced by Valsalva maneuvers...
November 6, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/29099047/concept-and-evaluation-of-a-new-piezoelectric-transducer-for-an-implantable-middle-ear-hearing-device
#15
Houguang Liu, Jinlei Cheng, Jianhua Yang, Zhushi Rao, Gang Cheng, Shanguo Yang, Xinsheng Huang, Mengli Wang
Implantable middle ear hearing devices (IMEHDs) have been developed as a new technology to overcome the limitations of conventional hearing aids. The piezoelectric cantilever transducers currently used in the IMEHDs have the advantages of low power consumption and ease of fabrication, but generate less high-frequency output. To address this problem, we proposed and designed a new piezoelectric transducer based on a piezoelectric stack for the IMEHD. This new transducer, attached to the incus body with a coupling rod, stimulates the ossicular chain in response to the expansion-and-contraction of its piezoelectric stack...
November 2, 2017: Sensors
https://www.readbyqxmd.com/read/29097036/-techniques-and-progress-in-the-imaging-of-the-ear
#16
Antoine Garin, Farida Benoudiba, Denis Ducreux
Ear and temporal bone imaging is essential for the diagnostic and preoperative management of middle ear lesions. The scanner is the exam of choice to analyze the walls and the contents of the middle ear. MRI is used to characterize the opacities of the middle ear and to evaluate possible neurological complications. Modern imaging techniques allow intraoperative guidance in otological surgery. Hearing implants are not always a contraindication to MRI but require precautions according to the type of implant.
October 30, 2017: La Presse Médicale
https://www.readbyqxmd.com/read/29097034/-medical-devices-correcting-the-deafness-hearing-aids-and-auditory-implants
#17
Jérôme Nevoux, Arnaud Coez, Éric Truy
The management of deafness has become a major public health issue as their lack of detection has a deleterious effect in children and increases the risk factors for aggravation of other pathologies in adults. The detection of deafness remains a real challenge: in the newborn, systematic screening at birth is a good strategy, in adults, much remains to be done. The functional rehabilitation of deafness is based on the use of hearing aids by aerial or bone conduction or of auditory implants. There are three types of auditory implants available: bone anchored hearing implants, middle ear implants and cochlear implants...
November 2017: La Presse Médicale
https://www.readbyqxmd.com/read/29095298/sudden-onset-of-static-equilibrium-dysfunction-in-patients-receiving-a-cochlear-implant
#18
Ying Gao, Qing Zhang, Jing Yan, Xiaorong Niu, Peng Han, Haifeng Yuan, Juan Hu, Bo Liu, Min Xu
BACKGROUND: We investigated the sudden onset of static equilibrium dysfunction caused by cochlear implantation (CI) in congenital hearing loss patients. METHOD: Twenty-five patients were selected from a cohort of unilateral CI recipients to form the CI group. Static posturography was performed 1 to 3 days before and 3 to 5 days after CI. Each patient underwent the test with eyes open (EO) and eyes closed (EC) for 30 seconds, separately. Another group of age- and sex-matched patients with no history of hearing impairment undergoing unrelated surgeries formed the control group, and were examined with the same tests pre- and post-surgery...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29072657/-the-influence-of-biological-compatibility-of-the-cyanoacrylate-glue-on-regeneration-of-the-cartilaginous-tissue
#19
F V Semenov, N F Skibitskaya
The objective of the present study was to evaluate the possibility of the application of the cyanoacrylate-based glue for the strengthening of the reconstructed elements of the middle ear and its influence on the regeneration of the cartilaginous tissue. We used the cartilaginous tissue from the auricles of the male California rabbits as a model. The cartilage was destroyed in a standard press. Half of the cartilage thus fragmented was implanted into the left auricle. The remaining part was mixed up with the cyanoacrylate glue and implanted into the right auricle of the same animal...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/29054109/influence-of-backside-loading-on-the-floating-mass-transducer-an-in-vitro-experimental-study
#20
Antoniu-Oreste Gostian, Martin Sylvester Otte, David Pazen, Magdalene Ortmann, David Schwarz, Karl Bernd Hüttenbrink, Dirk Beutner
HYPOTHESIS: The vibration of the floating mass transducer (FMT) of a single active middle-ear implant (AMEI) is distinctly influenced by the properties of the material coupled to its back side. BACKGROUND: In round window vibroplasty, the FMT needs to be padded against the surrounding bone opposite from the round window membrane. This represents one factor influencing its performance as a round window driver. Therefore, we examined the effects of different materials linked to the back side of an FMT on its vibration range...
October 20, 2017: Clinical Otolaryngology
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