The floating mass transducer at the round window: Direct transmission or bone conduction?

Arnold, A.; Kompis, Martin; Candreia, Claudia; Pfiffner, Flurin; Häusler, Rudolf

doi:10.1016/j.heares.2009.12.019

Cited by 42 publications

(36 citation statements)

References 36 publications

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“…Whereas in Arnold et al [2010] the standard deviation for the floating mass transducer coupled directly to the RW membrane is at least 12 dB above the corner frequency of the floating mass transducer, 1.5 kHz, the 'standard coupling' in our experiments leads to a reproducible performance up to at least 3 kHz, as evidenced by the flat frequency response and a standard deviation of approximately 5 dB in the frequency range of up to 3 kHz. The most likely reason for that difference is that Arnold et al [2010] performed an implantation through a posterior tympanotomy in human whole head preparations, thus simulating a clinical setting. In that approach, the access to the RW can most likely not be controlled as tightly as in our experiments, where angle and location of the actuator as well as the resection of the RW niche could be controlled very accurately.…”

Section: Discussionmentioning

confidence: 41%

“…However, current publications [Baumgartner et al, 2010;Boeheim et al, 2010;Colletti et al, 2006;Colletti et al, 2009;Cuda et al, 2009;Frenzel et al, 2009;Kiefer and Staudenmaier, 2010;Linder et al, 2009;Streitberger et al, 2009;Wollenberg et al, 2007] reveal a considerable variability regarding the degree of hearing restoration. To approach this issue, different methods of coupling an actuator to the RW membrane have been investigated in human temporal bone experiments [Arnold et al, 2010;Nakajima et al, 2010]. Experiments included variations such as different orientation, intervening materials between actuator and membrane, and overlaying materials in order to increase the mechanical source impedance of the actuator at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Conditions for Highly Efficient and Reproducible Round-Window Stimulation in Humans

Schraven¹,

Hirt²,

Goll³

et al. 2011

Audiol Neurotol

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Round-window stimulation is a new clinical approach for the application of active middle-ear implants. To investigate factors influencing the efficiency of round-window stimulation, experiments in 6 human temporal bones were performed with different actuator geometries and coupling conditions. The experiments show that the amplitude ratio between stapes and round-window actuator vibration is most efficient when using a 1.0-mm diameter rod with a 30° inclined tip geometry and an attached silicone pad. In this case, the amplitude ratio is 0.34 for frequencies up to 1.5 kHz and 0.27 for frequencies up to 20 kHz, with a standard deviation of only 4–6 dB at most frequencies. The analysis of data presented here and in a companion paper suggests that control of proper round-window membrane pretension as well as the inclined tip geometry are the major requirements for maximal performance.

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Section: Discussionmentioning

confidence: 41%

Section: Introductionmentioning

confidence: 99%

Conditions for Highly Efficient and Reproducible Round-Window Stimulation in Humans

Schraven¹,

Hirt²,

Goll³

et al. 2011

Audiol Neurotol

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“…Combining VSB with ossicular chain reconstruction may represent an elegant surgical solution in these cases. The floating mass transducer (FMT) can be positioned in different ways depending on the ossicular chain status, the placement in the RW being highly effective if a stable coupling to the membrane is insured [Arnold et al, 2010;Nakajima et al, 2010]. The transcanal approach has also been recently described in order to increase the adaptability of VSB to various situations [Bruschini et al, 2009;Foyt et al, 2006].…”

Section: Introductionmentioning

confidence: 99%

Functional Results of Vibrant Soundbridge Middle Ear Implants in Conductive and Mixed Hearing Losses

et al. 2011

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Objective: Our purpose was to evaluate the results of Vibrant Soundbridge (VSB) in conductive or mixed hearing loss. Materials and Methods: Twenty-five adult patients (29 ears) with a mixed or conductive hearing loss and various etiologies were included in this retrospective study. The preoperative ipsilateral pure tone average was 71 ± 3.0 dB, and the average bone conduction threshold was 42 ± 2.8 dB (n = 29). The transducer was placed on the long apophysis of the incus (n = 16), in the round window (n = 10) or on the stapes (n = 3). Results: No complications were noted. The bone conduction threshold remained unchanged. VSB was activated in all cases. The postoperative pure tone average without VSB was 63 ± 3.9 dB (n = 24) and with VSB in free-field condition 24 ± 2.1 dB (n = 22). Conclusions: VSB is safe and efficacious for auditory rehabilitation in conductive and mixed hearing losses.

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“…Although the force-to-input voltage transfer function of the Baha device is not amplitude-independent for stimulation levels below -30 dBV rms , we used the Baha implant reproduce a clinical situation. From the result of a previous study, we can estimate that our stimulation steps roughly covered a clinically relevant range from 20 dB HL to 70 dB HL [1]. Figure 1 shows the stimulation force independent transfer function V/F for CP, ST, and RW: the average magnitude difference of the LDV measurements between the stimulation at -20, -30 or -40 dBV rms is near zero, indicating a linear behavior.…”

Section: Discussionmentioning

confidence: 81%

Bone conduction responses of middle ear structures in Thiel embalmed heads

Arnold¹,

Stieger²,

Caversaccio³

et al. 2015

AIP Conference Proceedings

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Abstract. Thiel-embalmed human whole-head specimens offer a promising alternative model for bone conduction (BC) studies of middle ear structures. In this work we present the Thiel model's linearity and stability over time as well as its possible use in the study of a fixed ossicle chain. Using laser Doppler vibrometry (LDV), the motion of the retroauricular skull, the promontory, the stapes footplate and the round window (RW) were measured. A bone-anchored hearing aid stimulated the ears with step sinus tones logarithmically spread between 0.1 and 10 kHz. Linearity of the model was verified using input levels in steps of 10 dBV. The stability of the Thiel model over time was examined with measurements repeated after hours and weeks. The influence of a cement-fixed stapes was assessed. The middle ear elements measured responded linearly in amplitude for the applied input levels (100, 32.6, and 10 mV). The variability of measurements for both short-(2 h) and long-term (4-16 weeks) repetitions in the same ear was lower than the interindividual difference. The fixation of the stapes induced a lowered RW displacement for frequencies near 750 Hz (-4 dB) and an increased displacement for frequencies above 1 kHz (max. +3.7 dB at 4 kHz). LDV assessment of BCinduced middle ear motion in Thiel heads can be performed with stable results. The vibratory RW response is affected by the fixation of the stapes, indicating a measurable effect of ossicle chain inertia on BC response in Thiel embalmed heads.

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The floating mass transducer at the round window: Direct transmission or bone conduction?

Cited by 42 publications

References 36 publications

Conditions for Highly Efficient and Reproducible Round-Window Stimulation in Humans

Conditions for Highly Efficient and Reproducible Round-Window Stimulation in Humans

Functional Results of Vibrant Soundbridge Middle Ear Implants in Conductive and Mixed Hearing Losses

Bone conduction responses of middle ear structures in Thiel embalmed heads

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