Objective Assessment of Stapedotomy Surgery From Round Window Motion Measurement

Sim, Jae Hoon; Chatzimichalis, Michail; Röösli, Christof; Laske, Roman D.; Huber, Alexander

doi:10.1097/aud.0b013e318258c7a6

Cited by 35 publications

(40 citation statements)

References 17 publications

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“…Furthermore, possible leakage of cochlear fluids through gaps between the stapes prosthesis and the stapedotomy perforation may result in a less accurate estimation of the functional outcome. As an alternative, our previous study [Sim et al, 2012] introduced a method to assess functional results of reconstruction with stapes prostheses by measuring the volume displacement at the round window (RW). In this study, the maximum ESPL in the reconstruction with DACS PI was obtained in normal and reconstructed ears by comparing the volume displacements at the RW rather than stapes motions.…”

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confidence: 99%

Assessment of a Direct Acoustic Cochlear Stimulator

2012

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This study aimed to assess the functional results of a new, active, acoustic-mechanical hearing implant, the Direct Acoustic Cochlear Stimulation Partial Implant (DACS PI), in a preclinical study. The DACS PI is an electromagnetic device fixed to the mastoid by screws and coupled to a standard stapes prosthesis by an artificial incus (AI). The function of the DACS PI-aided reconstruction was assessed by determining: (1) the maximum equivalent sound pressure level (SPL) of the implant, which was obtained from measurements of the volume displacement at the round window in normal and implanted ears, and (2) the quality at the coupling interface between the AI of the DACS and the stapes prosthesis, which was quantified from measurements of relative motions between the AI and the prosthesis. Both measurements were performed with fresh temporal bones using a scanning laser Doppler interferometry system. The expected maximum equivalent SPL with a typical driving voltage of 0.3 V was about 115–125 dB SPL up to 1.5 kHz in reconstruction with the DACS PI, and decreased with a roll-off slope of about 65 dB/decade, reaching 90 dB SPL at 8 kHz. The large roll-off relative to a normal ear was presumed to be a relatively high inductive impedance of the coil of the DACS PI actuator at higher frequencies. Good coupling quality between the AI and the prosthesis was achieved below the resonance (∼1.5 kHz) of the DACS PI for all tested stapes prostheses. Above the resonance, the SMart Piston, which is composed of a shape-memory alloy, had the best coupling quality.

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Assessment of a Direct Acoustic Cochlear Stimulator

2012

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“…[29] Oval pencereye açılan çok geniş fenestra protezin çok hareket etmesine ve perilenf kaçağına neden olabilir, çok dar bir fenestra ise protezin az hareket etmesine ve işitme sonuçlarının istenilen seviyede iyileşmemesine neden olabilir. [29] Sennaroğlu ve ark., [27] 0.6 ve 0.8 mm Teflon piston ile yaptıkları çalışmalarında HY işitme eşiklerin-deki iyileşmenin 0.8 mm Teflon piston kullanılan grupta 0.6 mm Teflon piston kullanılan gruba göre daha iyi olduğunu bildirmişlerdir. Gristwood [30] 0.6 ve 0.8 mm pistonları karşılaştırmış ve piston çapının azalışı ile düşük frekanslarda kötü işitme sonuçları elde edildiğini ortaya koymuştur.…”

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Evaluation of efficacy of otosclerosis surgery on hearing outcomes

Topdağ

Topdağ²,

Aydin³

et al. 2014

Kulak Burun Bogaz Ihtis Derg

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Amaç: Bu çalışmada hastaların otoskleroz cerrahisi sonrası işitme sonuçları ve işitsel başarı oranları değerlendirildi ve cerrahi komplikasyonları ve tedavileri irdelendi. Objectives: In this study we aimed to evaluate the audiologic results and audiologic success rates following otosclerosis surgery and to discuss surgical complications and their management. Results: Functional success was achieved in 105 of 115 operated ears (91.3%). Functional success rates according to types of piston for 0.6 mm wire Teflon piston (n=71), fluoroplastic Teflon piston (n=30), K piston (n=12) and Easy piston (n=2) groups were, 88.7%, 93.3%, 100%, and 100% respectively. Six patients (5.2%) underwent revision surgery. Hastalar ve Patients and Methods Conclusion:Our study results suggest that stapes surgery is a successful and safe treatment modality with high success and low complication rates in the management of otosclerosis.

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“…1) was drilled approximately 2.5 mm beside the round window with a diamond burr of 0.7 mm diameter under water to prevent entry of air into the cochlea. A loudspeaker (ER-2, Etymotic Research, US) and a reference microphone (ER-7C, Etymotic Research, US) were placed into the artificial EC and acoustically sealed using a foam insert as done in earlier experiments [41], [42]. Acoustic excitation signals were generated by an audio analyzer (APx585 Audio Analyser, Audio Precision Inc., US) and amplified by an audio amplifier (RMX 850, QSC Audio Products, US).…”

Section: Sensor Experiments In Human Temporal Bonesmentioning

confidence: 99%

“…2014-0544). Preparation of the human temporal bone for ICSP measurements followed a standard surgical approach [41], [42]. Prior to drilling access to the inner ear, a standard conformity test of the ME was performed by quantifying the TBME-01353-2016 6 ME transfer function and comparing it to the ASTM practice ME standards [3], [43].…”

Section: Sensor Experiments In Human Temporal Bonesmentioning

confidence: 99%