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1. Experimenteller Vergleich von Vibrant Soundbridge Kopplern am Mechanischen Modellohr

Author

Stieger, Christof, Wey , Lukas, Graf, Lukas, Arnold, Andreas, Lochner, Jonas, Mojallal, Hamidreza, and Hürzeler , Nathan

Subjects
Medicine and health
Abstract

Einleitung: Aktive Mittelohrimplantate können bei medizinischen Problemen wie z.B. bei chronisch entzündeten äußeren Gehörgängen eine Alternative zu konventionellen Hörgeräten bieten. Die Vibrant Soundbridge (VSB) verwendet dazu verschiedene Koppler zum Übertragen [zum vollständigen Text gelangen Sie über die oben angegebene URL]

Published
2022
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2. Consensus Statement on Bone Conduction Devices and Active Middle Ear Implants in Conductive and Mixed Hearing Loss

Author

Maier, Hannes, Lenarz, Thomas, Agha-Mir-Salim, Parwis, Agterberg, Martijn J. H., Anagiotos, Andreas, Arndt, Susan, Ball, Geoffrey, Bance, Manohar, Barbara, Maurizio, Baumann, Uwe, Baumgartner, Wolfgang, Bernardeschi, Daniele, Beutner, Dirk, Bosman, Arjan, Briggs, Robert, Busch, Susan, Caversaccio, Marco, Dahm, Markus, Dalhoff, Ernst, Deveze, Arnaud, Ebrahimi-Madiseh, Azadeh, Fraysse, Bernard, Frenzel, Henning, Gavilan, Javier, Ghoncheh, Mohammad, Hakansson, Bo E. V, Hodgetts, William, Hol, Myrthe, Hol-land, Julian, Holmberg, Marcus, Huber, Alexander M., Jenkins, Herman, Katiri, Roulla, Kheirkhah, Kiana, Koitschev, Assen, Kompis, Martin, Lanting, Cris, Lassaletta, Luis, Lerut, Bob, Leuwer, Rudolf, Linder, Thomas, Loewenheim, Hubert, Lustig, Lawrence, Mandavia, Rishi, Manrique, Manuel, Martins, Jorge Humberto, Mertens, Griet, Mlynski, Robert, Mojallal, Hamidreza, Monini, Simonetta, Monksfield, Peter, Mueller, Alexander, Mylanus, Emmanuel, Nakajima, Hideko, Neudert, Marcus, Offeciers, Erwin, Pfiffner, Flurin, Pietsch, Markus, Plontke, Stefan K., Prenzler, Nils, Profant, Milan, Rahne, Torsten, Rajan, Gunesh, Ratuszniak, Anna, Raufer, Stefan, Ray, Jaydip, Reinfeldt, Sabine, Roosli, Christof, Rosenbom, Tove, Salcher, Rolf, Schoenermark, Matthias, Schwab, Burkard, Skarzynski, Henryk, Skarkynski, Piotr H., Snapp, Hillary, Sprinzl, Georg, Spearman, Michael, Stenfelt, Stefan, Stieger, Christof, Tringali, Stephane, Truy, Eric, Tysome, James, Van de Heyning, Paul, Verhaert, Nicolas, Wesarg, Thomas, Westerkull, Patrik, Wollenberg, Barbara, Zahnert, Thomas, Zarowski, Andrzej, Snik, Ad, Maier, Hannes, Lenarz, Thomas, Agha-Mir-Salim, Parwis, Agterberg, Martijn J. H., Anagiotos, Andreas, Arndt, Susan, Ball, Geoffrey, Bance, Manohar, Barbara, Maurizio, Baumann, Uwe, Baumgartner, Wolfgang, Bernardeschi, Daniele, Beutner, Dirk, Bosman, Arjan, Briggs, Robert, Busch, Susan, Caversaccio, Marco, Dahm, Markus, Dalhoff, Ernst, Deveze, Arnaud, Ebrahimi-Madiseh, Azadeh, Fraysse, Bernard, Frenzel, Henning, Gavilan, Javier, Ghoncheh, Mohammad, Hakansson, Bo E. V, Hodgetts, William, Hol, Myrthe, Hol-land, Julian, Holmberg, Marcus, Huber, Alexander M., Jenkins, Herman, Katiri, Roulla, Kheirkhah, Kiana, Koitschev, Assen, Kompis, Martin, Lanting, Cris, Lassaletta, Luis, Lerut, Bob, Leuwer, Rudolf, Linder, Thomas, Loewenheim, Hubert, Lustig, Lawrence, Mandavia, Rishi, Manrique, Manuel, Martins, Jorge Humberto, Mertens, Griet, Mlynski, Robert, Mojallal, Hamidreza, Monini, Simonetta, Monksfield, Peter, Mueller, Alexander, Mylanus, Emmanuel, Nakajima, Hideko, Neudert, Marcus, Offeciers, Erwin, Pfiffner, Flurin, Pietsch, Markus, Plontke, Stefan K., Prenzler, Nils, Profant, Milan, Rahne, Torsten, Rajan, Gunesh, Ratuszniak, Anna, Raufer, Stefan, Ray, Jaydip, Reinfeldt, Sabine, Roosli, Christof, Rosenbom, Tove, Salcher, Rolf, Schoenermark, Matthias, Schwab, Burkard, Skarzynski, Henryk, Skarkynski, Piotr H., Snapp, Hillary, Sprinzl, Georg, Spearman, Michael, Stenfelt, Stefan, Stieger, Christof, Tringali, Stephane, Truy, Eric, Tysome, James, Van de Heyning, Paul, Verhaert, Nicolas, Wesarg, Thomas, Westerkull, Patrik, Wollenberg, Barbara, Zahnert, Thomas, Zarowski, Andrzej, and Snik, Ad

Abstract

Nowadays, several options are available to treat patients with conductive or mixed hearing loss. Whenever surgical intervention is not possible or contra-indicated, and amplification by a conventional hearing device (e.g., behind-the-ear device) is not feasible, then implantable hearing devices are an indispensable next option. Implantable bone-conduction devices and middle-ear implants have advantages but also limitations concerning complexity/invasiveness of the surgery, medical complications, and effectiveness. To counsel the patient, the clinician should have a good overview of the options with regard to safety and reliability as well as unequivocal technical performance data. The present consensus document is the outcome of an extensive iterative process including ENT specialists, audiologists, health-policy scientists, and representatives/technicians of the main companies in this field. This document should provide a first framework for procedures and technical characterization to enhance effective communication between these stakeholders, improving health care., Funding Agencies|Cochlear Ltd; MED-EL Medical Electronics and Oticon Medical

Published
2022
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3. Functional Evaluation of Middle Ear Prostheses

Author

Mojallal, Hamidreza, Stieve, M., Turck, C., Krueger, I., Witteck, N., Süß, B., Mueller, P. P., Behrens, P., Lenarz, T., Kim, Sun I., editor, Suh, Tae Suk, editor, Magjarevic, R., editor, and Nagel, J. H., editor

Published
2007
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6. Comparison between incus short process and long process coupling of the vibrant soundbridge in human temporal bones.

Author

Graf, Lukas, Lochner, Jonas, Mojallal, Hamidreza, Arnold, Andreas, Honegger, Flurin, and Stieger, Christof

Subjects
PHYSICAL sciences, STATISTICS, HEARING aids, TRANSDUCERS, QUALITY assurance, RESEARCH funding, ELECTRIC stimulation, SOUND, DATA analysis, ACOUSTIC stimulation, DATA analysis software, TEMPORAL bone, EAR ossicles
Abstract

The Vibrant Soundbridge (VSB) is one of the most widely used implantable hearing devices. It consists of a vibrating floating mass transducer (FMT) that is connected to a middle ear structure. The standard coupling devices for sensorineural hearing loss are short process (SP) or long process (LP) couplers. This study directly compared the electro-mechanical performance of the SP- and LP-coupled FMT of the VSB in the same temporal bone specimen (n = 10). We measured velocity magnitudes and total harmonic distortions (THD) of the stapes (ST) and the round window (RW) using laser Doppler Vibrometry (LDV). Comparison shows a maximally 10 dB higher magnitude for the LP coupler at ST and RW for frequencies below 600 Hz, whereas the SP coupler shows a maximally 20 dB higher magnitude at the ST and RW for frequencies above 600 Hz. THD show similar behaviour with less distortion at 500 Hz for the LP coupler and less distortions for the SP coupler in higher frequencies. Our experiments showed that the SP coupling may be mechanically favourable, in terms of magnitude and distortion, for the transmission of FMT vibrations at higher frequencies. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Kurz- und Langzeitergebnisse der Versorgung von Kindern mit Schallleitungsstörung mit dem Knochenleitungs-Hörsystem ADHEAR

Author

Neumann, Katrin, Dazert, Stefan, Postert, Benno, Mojallal, Hamidreza, and Westerkull, Patrik

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Fragestellung: Stirnbandintegrierte Knochenleitungshörgeräte (SBKL-HGs) erzielen bei Kindern mit permanenten Schallleitungsstörungen oder chronisch drainierenden Ohren wegen Kopfdrucks, Schwitzens oder kosmetischer Stigmata oft nur eine mäßige Trageakzeptanz. Eine Alternative[zum vollständigen Text gelangen Sie über die oben angegebene URL], 22. Jahrestagung der Deutschen Gesellschaft für Audiologie

Published
2019

9. Versorgung von Patienten mit hochgradiger Schwerhörigkeit - Vergleich von konventionellen Hörgeräten mit einem direkten akustischen Cochlea Stimulator (DACS-PI)

Author

Busch, Susan, Kruck, Stefanie, Leuwer, Rudolf, Hoth, Sebastian, Praetorius, Mark, Plinkert, Peter, Mojallal, Hamidreza, Schwab, Burkard, Maier, Hannes, and Lenarz, Thomas

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Einleitung: Patienten mit einer hochgradigen Schwerhörigkeit, die mit einem konventionellen Hörsystem versorgt sind, klagen häufig über einen unzureichenden Hörgewinn, eine schlechte Klangqualität und störende Rückkopplungsgeräusche. Für solche Patienten[for full text, please go to the a.m. URL], 85. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2014

10. Das implantierbare Hörsystem Cochlear's DACS ID: Audiologische Ergebnisse für mittel- bis hochgradige kombinierte Schwerhörigkeiten

Author

Kludt, Eugen, Mojallal, Hamidreza, Maier, Hannes, Schwab, Burkard, and Lenarz, Thomas

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Einleitung: Ziel dieser weltweit ersten klinischen Studie mit dem neuen implantierbaren Hörsystem C-DACS ID (Cochlear’s Direct Acoustic Cochlear Stimulator Investigational Device) war die Evaluierung der audiologischen Ergebnisse bei Patienten mit mittel- bis hochgradigen Schwerhörigkeiten[for full text, please go to the a.m. URL], 83. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2012

11. Prediction of the sound pressure at the ear drum for open fittings

Author

Sankowsky-Rothe, Tobias, Blau, Matthias, Mojallal, Hamidreza, Teschner, Magnus, Thiele, Cornelia, System, HAL, and Société Française d'Acoustique

Subjects
eardrum, [SPI.ACOU] Engineering Sciences [physics]/Acoustics [physics.class-ph], otorhinolaryngologic diseases, sense organs, sound pressure, open fittings, hearing aid
Abstract

The fitting of hearing aids requires knowledge of the sound pressure generated at the ear drum. Traditionally, the sound pressure at the ear drum is estimated by the use of a model of an average ear canal (e.g. a coupler), but obviously, such a model cannot account for inter-individual differences. A better practice, but difficult, is the measurement at the ear drum with a probe-microphone. Alternatively, the sound pressure at the ear drum can be predicted by measurements away from the ear drum. Two methods, one of them based on the phase of the reflectance measured at the ear mold, and the other one based on minima of the sound pressure measured in the ear canal a few millimeters away from the ear mold, were investigated for the use with vented hearing aids. The methods to predict the sound pressure at the ear drum for vented hearing aids will be presented. A preliminary validation by probe tube measurements in 20 ears shows that the accuracy of the predictions is close to what could be obtained with closed fittings, with a few excaptions that will be discussed.

Published
2012

12. Vibrant Soundbridge: Ergebnisse der Erweiterung neuer Anwendungsindikationen

Author

Schwab, Burkard, Kontorinis, Georgios, Mojallal, Hamidreza, Hinze, Anna-Lena, and Lenarz, Thomas

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Einleitung: Die kontinuierlich zunehmende Verwendung des Vibrant Soundbridge (VSB) Mittelohr-Implantates erweitertet die Indikationen von mittelgradiger Schallempfindungsschwerhörigkeit zu Schallleitungs- oder kombinierter Schwerhörigkeit. Neue Applikationen des VSB-Wandlers, bzw. am runden[for full text, please go to the a.m. URL], 82. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2011

13. Audiologische Vergleichsstudie Sprachverstehen in Ruhe und im Störgeräusch mit knochenverankerten Hörsystemen

Author

Giere, Thomas, Salcher, Rolf Benedikt, Hinze, Anna-Lena, Kruck, Stefanie, Mojallal, Hamidreza, and Lenarz, Thomas

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Einleitung: Knochenverankerte Hörsysteme werden bei Mittelohr-, kombinierter Schwerhörigkeit und einseitiger Taubheit erfolgreich angewendet. In ruhiger Umgebung werden zufriedenstellende Ergebnisse erreicht. Schwierigkeiten bestehen aber in geräuschvoller Umgebung. Aktuell gibt es zwei[for full text, please go to the a.m. URL], 82. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2011

14. Audiologische Ergebnisse mit dem implantierbaren Hörsystem C-DACS ID für mittel- bis hochgradige kombinierte Schwerhörigkeiten

Author

Mojallal, Hamidreza, Schwab, Burkard, and Lenarz, Thomas

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Einleitung: Nach dem heutigen Stand der Technik gibt es für die Patienten mit mittel- bis hochgradige kombinierten Schwerhörigkeiten keine optimale apparative Hörversorgung. Ziel dieser Studie war die Evaluierung der audiologischen Ergebnisse mit dem neuartigen implantierbaren Hörsystem[for full text, please go to the a.m. URL], 82. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2011

15. Comparative upgrade from Baha® Compact to Baha® BP 100

Author

Giere, Thomas, Salcher, Rolf Benedikt, Lenarz, Minoo, Mojallal, Hamidreza, Neben, Nicole, and Lenarz, Thomas

Subjects
ddc: 610, otorhinolaryngologic diseases, 610 Medical sciences, Medicine
Abstract

Introduction: Subjects with Conductive hearing loss, mixed hearing loss and Single sided deafness (SSD) may benefit from the Baha system, because it bypasses the damaged or problematic area while stimulating the cochlea directly through bone conduction. The Baha® BP 100 allows a more precise [for full text, please go to the a.m. URL], 81st Annual Meeting of the German Society of Oto-Rhino-Laryngology, Head and Neck Surgery

Published
2010
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16. Therapie der gering- bis mittelgradigen kombinierten Schwerhörigkeiten mit BAHA® und Vibrant Soundbridge®

Author

Mojallal, Hamidreza, Giere, Thomas, Hinze, Anna-Lena, Lenarz, Thomas, and Schwab, Burkard

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Einleitung: Für die rehabilitative Therapie der Schallleitungs- und kombinierten Schwerhörigkeiten stehen nach dem aktuellen Stand der Technik mehrere Alternative zur Verfügung. Zusätzlich zu den konventionellen Hörgeräten, die in einigen Fällen einsetzbar sind, können[for full text, please go to the a.m. URL], 81. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2010

17. Alterations in Auditory Change Detection Associated with Tinnitus Residual Inhibition Induced by Auditory Electrical Stimulation

Author

Mahmoudian, Saeid, additional, Farhadi, Mohammad, additional, Mohebbi, Mehrnaz, additional, Alaeddini, Farshid, additional, Najafi-Koopaie, Mojtaba, additional, Farahani, Ehsan Darestani, additional, Mojallal, Hamidreza, additional, Omrani, Ronak, additional, Daneshi, Ahmad, additional, and Lenarz, Thomas, additional

Published
2015
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19. Anregung des Innenohres durch einen Jiggler

Author

Teschner, Magnus, Mojallal, Hamidreza, Pesch, Joerg, and Lenarz, Thomas

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Einleitung: Die Anregung des Innenohres durch Schalltransmission über den Hirnliquor kann mit Hilfe eines Jigglers untersucht werden. Erste Untersuchungen deuteten darauf hin, dass dieser Weg der Schalltransmission effektiv sein kann. Weitere Untersuchungen sollen dies nun untermauern. Methode:[for full text, please go to the a.m. URL], 80. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2009

20. Implantierbare Hörgeräte - Privilege und Limitationen aus audiologischer Sicht in einer Langzeitbeobachtung

Author

Mojallal, Hamidreza, Schwab, Burkard, and Lenarz, Thomas

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Einleitung: Nach mehr als einer Dekade der Nutzung von verschiedenen implantierbaren Hörgeräten sollen die Langzeitergebnisse und Indikationen dargestellt werden. Patienten und Methoden: Bei den Patienten (n= 69) mit implantierbaren Hörsystemen Vibrant Soundbridge® (VSB),[for full text, please go to the a.m. URL], 80. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2009

21. Vibrant Soundbridge® Applikation am runden Fenster - eine stabile operative Ankopplung

Author

Salcher, Rolf Benedikt, Mojallal, Hamidreza, Schwab, Burkard, and Lenarz, Thomas

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Bei mittel- bis hochgradig kombinierten Schwerhörigkeiten können Patienten mit Radikalhöhlen, chronischer Otorrhoe oder mehrfachem erfolglosen operativen Höraufbau durch Stimulation mit einer Vibrant Soundbridge [VSB] am runden Fenster [RW] gut versorgt werden.[for full text, please go to the a.m. URL], 80. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie

Published
2009

22. Functional Evaluation of Middle Ear Prostheses

Author

Mojallal, Hamidreza, primary, Stieve, M., additional, Turck, C., additional, Krueger, I., additional, Witteck, N., additional, Süß, B., additional, Mueller, P. P., additional, Behrens, P., additional, and Lenarz, T., additional

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24. First Clinical Experiences With a Direct Acoustic Cochlear Stimulator in Comparison to Preoperative Fitted Conventional Hearing Aids

Author

Busch, Susan, primary, Kruck, Stefanie, additional, Spickers, Dirk, additional, Leuwer, Rudolf, additional, Hoth, Sebastian, additional, Praetorius, Mark, additional, Plinkert, Peter K., additional, Mojallal, Hamidreza, additional, Schwab, Burkard, additional, Maier, Hannes, additional, and Lenarz, Thomas, additional

Published
2013
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25. Normative data of multifrequency tympanometry in rabbits

Author

Stieve, Martin, Hedrich, Hans, Mojallal, Hamidreza, Behrens, Peter, Müller, Peter, Lenarz, Thomas, Stieve, Martin, Hedrich, Hans, Mojallal, Hamidreza, Behrens, Peter, Müller, Peter, and Lenarz, Thomas

Abstract

In an experimental study, we evaluated acoustic immittance in rabbits in order to use these data as normative values for further experimental investigations. This study is the first experimental evaluation of both conventional 226 Hz and multifrequency tympanometry (MFT) in rabbits. For the investigation, we used 33 female New Zealand rabbits weighing 3.2 - 4.4 kg and aged six months. Bilateral measurements using conventional 226 Hz and MFT were performed under general anaesthetic. A 226 Hz tympanogram was recorded for all animals by conducting an air pressure sweep from +200 to -400 daPa at a rate of 50 daPa/s. Subsequent tympanograms were recorded over a wide frequency range from 250 to 2000 Hz. The acoustic impedance device used in this study provided reproducible and evaluable tympanograms. The applied tone frequency of 226 Hz proved to be especially suitable for determining compliance. Normative data obtained from our study reveal the resonance frequency to be 1368±205 standard deviation (SD) for the right side and 1413±216 SD for the left side. The values for physiological acoustic immittance of the middle ear in the rabbit obtained here can serve as normative data in subsequent experimental animal studies. © Laboratory Animals Ltd.

Published
2008

26. Multicenter Study With a Direct Acoustic Cochlear Implant

Author

Lenarz, Thomas, primary, Zwartenkot, Joost W., additional, Stieger, Christof, additional, Schwab, Burkard, additional, Mylanus, Emmanuel A. M., additional, Caversaccio, Marco, additional, Kompis, Martin, additional, Snik, Ad F. M., additional, D’hondt, Christiane, additional, and Mojallal, Hamidreza, additional

Published
2013
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31. Power Stapes

Author

Kontorinis, Georgios, primary, Lenarz, Thomas, additional, Mojallal, Hamidreza, additional, Hinze, Anna-Lena, additional, and Schwab, Burkard, additional

Published
2011
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34. Cortical auditory evoked potentials as an objective measurement of hearing responses in users of non-implantable bone conduction device.

Author

Valim, Caroline and Mojallal, Hamidreza

Subjects
*AUDITORY evoked response, *BONE conduction, *ARTIFICIAL implants, *HEARING levels, *CONDUCTIVE hearing loss, *PATIENT compliance
Abstract

Purpose: The aim of this acute prospective experiment was to asses the use of Cortical Auditory Evoked Potentials (CAEPs) with speech stimuli as an objective measure to estimate hearing responses of a group of adults with artificial conductive hearing loss adapted with a nonimplantable bone conduction device. Methods: Ten normal hearing adults participated in this study. Single subject repeated measures design with each subject serving as its own control. Participants' CAEPs elicited by two sets of speech stimuli were recorded and compared according to three hearing conditions: unaided normal-hearing (NH), unaided with artificial conductive hearing loss (aCHL), and aided with an adhesive bone conduction device (aBCD). In each condition, the stimuli were first presented at a fixed intensity level and the hearing thresholds for pure tones as well as speech sounds were measured. Participants' responses obtained with objective measurements were later compared with their psychoacoustic performance in sound-field. Results: Preliminary results indicated distinctive electrophysiological responses between conditions. Overall, responses obtained in the normal hearing condition and those acquired during the aBCD showed higher CAEP amplitudes (N1-P2) than in the aCHL condition. Results also indicated differences in responses according to stimuli properties. A comprehensive description of the present findings will be presented at the conference. Conclusion: CAEPs can be considered as an objective assessment tool not only to estimate hearing performance with non-implantable bone conduction hearing devices but also with all other hearing devices, especially in young children and patients with limited cooperation ability in subjective audiometry. [ABSTRACT FROM AUTHOR]

Published
2022

36. Multifrequency Tympanometry

Author

Stieve, Martin, primary, Mojallal, Hamidreza, additional, Battmer, Rolf-Dieter, additional, Winter, Mark, additional, and Lenarz, Thomas, additional

Published
2007
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38. DACS A new implantable Hearing system for Moderate to Severe Mixed Hearing Loss.

Author

Kim, Sun I., Suh, Tae Suk, Magjarevic, R., Nagel, J. H., Mojallal, Hamidreza, Stieger, C., Grasshof, E., Kompis, M., Bernhard, H., Haller, M., Haeusler, R., and Lenarz, T.

Abstract

The adequate treatment of the patients with moderate to severe mixed hearing loss (MHL) is not sufficiently possible with conventional hearing aids. These patients have enough cochlear reserve, but the additional middle ear disorder limits the usage of conventional hearing aids (gain limitation and distortion). The second possibility for such patients would be the bone conduction hearing aids, which indicate an insufficient gain for moderate to severe MHL. On the other hand because of good cochlear reserve there isn't an indication for cochlear implantation. Therefore there is no optimal way to give an adequate gain to patients with moderate to severe MHL. The new improved DACS-system (Direct Acoustic Cochlear Stimulation) realizes a direct transfer to the inner ear. In this way the conductive disorders of middle ear does not have any influence on the sound transfer. After an introduction of the functional principle of the system the pre- and postoperative audiological results of 4 implanted patients will be presented in this paper. The one year post operative results indicate a functional gain of about 50 dB HL and an SRT (Speech Reception Threshold) improvement of about 40 dB SPL. [ABSTRACT FROM AUTHOR]

Published
2007
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39. Functional Evaluation of Middle Ear Prostheses.

Author

Kim, Sun I., Suh, Tae Suk, Magjarevic, R., Nagel, J. H., Mojallal, Hamidreza, Stieve, M., Turck, C., Krueger, I., Witteck, N., Süß, B., Mueller, P. P., Behrens, P., and Lenarz, T.

Abstract

In order to improve new materials as middle ear prostheses, a method for evaluation of transfer function of these materials had to be developed. The measurements were performed in three stages. First, a mechanical middle ear model was designed which should simulate the mechanical and acoustical characteristics of intact middle ear. In this model different commercial prostheses and newly developed implants were measured by means of Laser Doppler Velocimetry (LDV). To control the stiffness of the system, we used Tympanometry as well as Multi-Frequency Tympanometry (MFT). In the second and third stages the same evaluations were followed in fresh human temporal bones as well as in animal experiments. The measurements in the mechanical middle ear model indicated a good comparability with the transfer function of the intact middle ear, particularly up to resonance frequency of the middle ear, which was about 1200-1500 Hz. The influences of mass and stiffness could be determined appropriately using the middle ear model. The measurements with different prostheses resulted in no significant variations in the transfer functions of commercial and new implants. The results of experiments on fresh temporal bones again showed no significant variation in the transfer functions of different prostheses. A median damping of about 15 to 20 dB particularly beyond the resonance frequency was measured using implanted prostheses relative to the transfer function of the intact ossicular chain. Also the results of MFT measurements in animals on the implanted and non-implanted side (300 days postoperative) will be presented. [ABSTRACT FROM AUTHOR]

Published
2007
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40. Power stapes: an alternative method for treating hearing loss in osteogenesis imperfecta?

Author

Kontorinis G, Lenarz T, Mojallal H, Hinze AL, and Schwab B

Subjects
Female, Hearing Loss, Conductive etiology, Hearing Loss, Conductive rehabilitation, Hearing Loss, Mixed Conductive-Sensorineural etiology, Hearing Loss, Mixed Conductive-Sensorineural rehabilitation, Humans, Male, Osteogenesis Imperfecta surgery, Retrospective Studies, Treatment Outcome, Hearing Aids, Hearing Loss, Conductive surgery, Hearing Loss, Mixed Conductive-Sensorineural surgery, Osteogenesis Imperfecta complications, Stapes Surgery
Abstract

Objective: To present power stapes, stapedotomy, and middle ear implantation with Vibrant SoundBridge (VSB) performed in a one-step surgery as an alternative option for hearing rehabilitation in patients with osteogenesis imperfecta (OI)., Study Design: Retrospective case series., Setting: Tertiary referral ear center., Patients: A family with genetically proven OI Type I., Interventions: Two patients, mother and son, with severe to profound mixed hearing loss underwent 3 power stapes, 1 unilateral and 1 bilateral sequential., Main Outcome Measures: Thorough audiological diagnostic batteries including aided and unaided pure-tone and free-field audiometry and Freiburg monosyllabic word test were used to assess the preoperative status and the postoperative hearing outcome. High-resolution computed tomography of the temporal bones was performed as well. Surgical procedure and any special considerations were analyzed in detail., Results: The hearing outcome was favorable in all cases, showing in comparison to the preoperative values an average improvement of 36.8 dB. Severe intraoperative bleeding of the middle ear mucosa was the only complication and could be easily controlled by allowing short time intervals. Inner ear trauma did not occur in any case., Conclusion: Power stapes represents a safe and promising procedure for treating hearing loss in selected patients with OI. Furthermore, it introduces a new, advantageous VSB application in cases of mixed hearing loss with severe otosclerosis and increased bone-conduction thresholds.

Published
2011
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41. Multifrequency tympanometry: experimental application after implantation of ossicular replacement prosthesis in rabbits.

Author

Stieve M, Mojallal H, Battmer RD, Winter M, and Lenarz T

Subjects
Animals, Ceramics, Connective Tissue physiology, Female, Rabbits, Reference Standards, Reference Values, Reproducibility of Results, Temporal Bone anatomy & histology, Temporal Bone physiology, Time Factors, Titanium, Acoustic Impedance Tests methods, Ossicular Prosthesis
Abstract

Hypothesis: We used multiple-frequency tympanometry (MFT) to evaluate the influence of a newly developed ossicular replacement prosthesis on transmission characteristics of middle ear., Background: Multiple-frequency tympanometry is a technique for evaluating the emittance of the middle ear over a wide frequency range. It has been shown to be sensitive to certain middle ear conditions that are not detected by conventional 226-Hz tympanometry. In the field of experimental evaluation, MFT has been shown in certain animal studies to be useful in monitoring diseases., Methods: Thirty-six prostheses composed of titanium dioxide ceramic were implanted into the right middle ear of female rabbits. Bilateral measurements using conventional 226-Hz and MFT were performed before implantation and after 28, 84, and 300 days postoperatively. The results of the preoperative examinations yielded reference values for physiological resonance frequency. After dissecting the temporal bone, we opened the middle ear and analyzed both the surrounding tissue and the position of the prosthesis., Results: The constant values for compliance revealed by both preoperative and postoperative measurements indicate good reproducibility of 226-Hz tympanometry. Postoperatively, resonance frequency increased continuously up to the 300th day. The observation supports the assumption that the higher stiffness level of connective tissue influenced resonance frequency., Conclusion: The reference values in this study can serve as guidelines for further experimental trials.

Published
2007
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