Impact of Floating Mass Transducer Coupling and Positioning in Round Window Vibroplasty

Rajan, Gunesh; Lampacher, Peter; Ambett, Ranjeeta; Dittrich, Gregor; Kuthubutheen, Jafri; Wood, B. E.; McArthur, Anne; Marino, Roberta

doi:10.1097/mao.0b013e318206fda1

Cited by 52 publications

(33 citation statements)

References 12 publications

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“…According to their results, improvements in postoperative aided thresholds were achieved for all patients. Improved pure-tone threshold or speech recognition scores after FMT stimulation on the RWM have also been reported in other clinical studies (Cuda et al 2009;Linder et al 2009;Martin et al 2009;Streitberger et al 2009;Rajan et al 2011).…”

Section: Introductionsupporting

confidence: 67%

Measurement of Basilar Membrane Motion During Round Window Stimulation in Guinea Pigs

Chen

Guan

Zhang

et al. 2014

JARO

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Driving the cochlea in reverse via the round window membrane (RWM) is an alternative treatment option for the hearing rehabilitation of a nonfunctional or malformed middle ear. However, cochlear stimulation from the RWM side is not a normal sound transmission pathway. The basilar membrane (BM) motion elicited by mechanical stimulation of the RWM is unknown. In this study, the BM movement at the basal turn was investigated in both reverse via RWM drive and acoustic stimulation in the ear canal or forward drive in postmortem isolated temporal bone preparations of guinea pigs. During reverse drive, a magnetcoil was coupled on RWM, and the BM vibration at the basal turn and the movement of the incus tip were measured with laser Doppler vibrometry. During forward drive, the vibration of the incus tip induced by sound pressure in the ear canal resulted in BM vibration and the BM movement at the same location as that in the reverse stimulation was measured. The displacement ratio of the BM to RWM in reverse drive and the ratio of the BM to incus in forward drive were compared. The results demonstrated that the BM response measured in both situations was similar in nature between forward and reverse drives. This study provides new knowledge for an understanding of BM movement induced by reverse drive via the RWM stimulation.

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Section: Introductionsupporting

confidence: 67%

Measurement of Basilar Membrane Motion During Round Window Stimulation in Guinea Pigs

Chen

Guan

Zhang

et al. 2014

JARO

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“…This study expands the work of Rajan et al (8) by examining the coupling efficiency when the FMT has been in contact with the RW either directly or with fascial underlay or crimped to the stapes or the incus.…”

mentioning

confidence: 83%

“…Nine patients presented with a conductive hearing loss, six had a mixed hearing loss, and one patient a sensorineural hearing loss. All subjects could not benefit from conventional hearing aids because of chronic otitis externa (Subjects 9, 12), chronic suppurative otitis media (Subjects 1, 3, 4, 5, 6,7,8,10,11,13,14,16), severe to profound mixed hearing loss (Subject 2), and a non-healing external auditory canal resulting from carcinoma removal (Subject 15). The cochlear (bone conduction hearing threshold) of all patients met the manufacturer's specifications and all patients had speech perception results above 50% in the ear considered for implantation.…”

Section: Patientsmentioning

confidence: 99%

Does Coupling and Positioning in Vibroplasty Matter? A Prospective Cohort Study

Marino

Lampacher

Dittrich

et al. 2015

Otology &Amp; Neurotology

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“…Very few studies, always through retrospective data collection, have published speech in noise results comparing the use of acoustic hearing implants to preoperative hearing aid scores. When comparing the VSBaided condition to an aided or unaided preoperative condition, reports show a variable improvement of 2.8-5 dB SNR [Beltrame et al, 2009;Böheim et al, 2012;Rajan et al, 2011]. Remarkably, with the current DACI, aided sound field thresholds show amplification on all frequencies, i.e.…”

Section: Study Qualitymentioning

confidence: 99%

A Comparative Study on Speech in Noise Understanding with a Direct Acoustic Cochlear Implant in Subjects with Severe to Profound Mixed Hearing Loss

et al. 2014

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The aim of this study was to investigate the efficacy of a direct acoustic cochlear implant (DACI) for speech understanding in noise in patients suffering from severe to profound mixed hearing loss (MHL) due to various etiologies compared to the preoperative best-aided condition. The study was performed at five tertiary referral centers in Europe (Belgium, Germany, Poland and Spain). Nineteen adult subjects with severe to profound MHL due to (advanced) otosclerosis, ear canal fibrosis, chronic otitis media, tympanosclerosis or previous cholesteatoma were implanted with a DACI (Codacs™ Investigational Device) combined with a conventional stapes prosthesis. Unaided and aided speech reception scores in quiet and in noise, preoperative and postoperative air and bone conduction thresholds and aided and unaided sound field thresholds were measured prospectively during the study. Subjective benefit analysis was determined through the Abbreviated Profile of Hearing Aid Benefit questionnaire. Quality of life was measured by the Health Utilities Index. All subjects were fitted preoperatively with hearing aids and/or a bone conduction implant on a headband before DACI implantation. This allows direct comparison between different hearing rehabilitation solutions. The mean speech reception threshold in noise improved significantly by 7.9 dB signal-to-noise ratio (SNR) after activation of the DACI compared to the preoperative best-aided condition. For all 19 subjects, a mean postoperative aided speech reception threshold of 2.6 dB SNR (standard deviation: 8.3 dB) was measured. On average, no significant shift in the bone conduction thresholds was noted 4-5 months after implantation. A mean sound field threshold improvement of 46 and 16 dB was measured compared to the preoperative unaided and best-aided condition, respectively. Speech perception tests in quiet showed a mean improvement of the word recognition scores by 65 and 48% at 65 dB SPL compared to the preoperative unaided and best-aided condition, respectively. In summary, DACI provides an effective improvement of the speech perception in noise compared to the best-aided condition in subjects suffering from severe to profound MHL.

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Impact of Floating Mass Transducer Coupling and Positioning in Round Window Vibroplasty

Cited by 52 publications

References 12 publications

Measurement of Basilar Membrane Motion During Round Window Stimulation in Guinea Pigs

Measurement of Basilar Membrane Motion During Round Window Stimulation in Guinea Pigs

Does Coupling and Positioning in Vibroplasty Matter? A Prospective Cohort Study

A Comparative Study on Speech in Noise Understanding with a Direct Acoustic Cochlear Implant in Subjects with Severe to Profound Mixed Hearing Loss

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