Effect of transducer attachment on vibration transmission and transcranial attenuation for direct drive bone conduction stimulation

Rigato, Cristina; Reinfeldt, Sabine; Hȧkansson, Bo; Jansson, Karl-Johan Fredén; Renvall, Erik; Eeg-Olofsson, Måns

doi:10.1016/j.heares.2019.06.006

Cited by 18 publications

(15 citation statements)

References 29 publications

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“…This effect is much more pronounced in the "Baha" group using the B-71 transducer (Figure 3). Similar trends for TT were reported for cadaver heads starting at 1 kHz, as in our measurements (Rigato et al 2019;Stenfelt and Goode 2005) and patients, showing increasing TT starting above 2 kHz (Stenfelt 2012). In contrast, Eeg-Olofsson et al (2013) found no statistically significant differences above 2 kHz, when comparing the contralateral parietal location to the ipsilateral parietal location.…”

Section: Transcranial Transmission With Transcutaneous Couplingsupporting

confidence: 89%

“…Two major parameters affecting BC transmission are the geometric proximity of the source to the cochleae and skin dampening. Ipsilateral promontory motion (PM) increases with proximity of the stimulation to the ipsilateral cochlea in cadaver heads (Dobrev et al 2018;Eeg-Olofsson et al 2008), while having little effect on the contralateral side (Rigato et al 2019;Stenfelt and Goode 2005). The same was found in living patients based on measurement of hearing thresholds (Reinfeldt et al 2014).…”

Section: Introductionmentioning

confidence: 67%

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Transcutaneous and percutaneous bone conduction sound propagation in single-sided deaf patients and cadaveric heads

Beros

Dobrev

Farahmandi

et al. 2021

International Journal of Audiology

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Objective: To investigate transcranial transmission (TT) and the dampening effect of the skin in patients and cadaver heads. Design: In patients a pure tone bone conduction audiogram for ipsilateral and contralateral stimulation was performed. The TT was defined as the difference between ipsilateral and contralateral hearing thresholds. In cadaver heads ipsilateral and contralateral promontory motion was measured using a threedimensional Laser Doppler Vibrometer system. Study sample: Seven single-sided deaf patients fitted with a Baha V R Connect, fifteen single-sided deaf patients without a bone conduction hearing aid and five Thiel-embalmed cadaver heads were included. Results: The TT decreased with increasing frequency in patients and cadaver heads. No significant difference was seen between patients and cadaver heads. Measurements on patients and cadaver heads showed increasing skin attenuation with increasing frequency. However, the dampening effect was 3-12 dB higher in patients than in cadavers at all frequencies. Conclusion: The TT was not significantly different for patients compared to cadaver heads. The value of promontory motion to estimate TT in patients need to be further evaluated. The skin attenuates a BC stimulus by 10-20 dB in patients and by a smaller amount in cadaver heads, probably due to changes in the properties of the Thiel-conserved skin.

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Section: Transcranial Transmission With Transcutaneous Couplingsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 67%

Transcutaneous and percutaneous bone conduction sound propagation in single-sided deaf patients and cadaveric heads

Beros

Dobrev

Farahmandi

et al. 2021

International Journal of Audiology

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“…It was concluded that in the typical implant position a 10-20 dB lower response was seen compared to locations closer to the cochlea, and squamosal suture does not have a significant effect on the sound delivered. Rigato et al studied the effect of implant attachment on the transmitted vibration to the cochlea using a balanced electromagnetic separation transducer [16]. The authors concluded that a smaller attachment might result in better performance at higher frequencies (above 5 kHz).…”

Section: Discussionmentioning

confidence: 99%

“…The transmitted vibration to the cochlea using BCIs has been widely studied in the literature using accelerometers [8][9][10] and laser Doppler vibrometry (LDV) techniques. A broad range of studies have focused on the effect of implant location on the transmitted sound to the cochlear promontory [11][12][13][14][15][16][17][18]. In studies of percutaneous devices, a significant effect was found when the implant was located closer to the cochlea [9].…”

Section: Introductionmentioning

confidence: 99%

The BONEBRIDGE active transcutaneous bone conduction implant: Effects of location, lifts and screws on sound transmission

Rohani

Bartling

Ladak

et al. 2020

Journal of Otolaryngology - Head & Neck Surgery

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Background: The BONEBRIDGE (MED-EL, Innsbruck, Austria) is a bone-conduction implant used in the treatment of conductive and mixed hearing loss. The BONEBRIDGE consists of an external audio processor and a boneconduction floating mass transducer that is surgically implanted into the skull in either the transmastoid, retrosigmoid or middle fossa regions. The manufacturer includes self-tapping screws to secure the transducer; however, self-drilling screws have also been used with success. In cases where the skull is not thick enough to house the transducer, lifts are available in a variety of sizes to elevate the transducer away from the skull. The objective of the present study was to investigate the effects of screw type, lift thickness, and implant location on the sound transmission of the BONEBRIDGE. Method: Six cadaveric temporal bones were embalmed and dried for use in this study. In each sample, a hole was drilled in each of the three implant locations to house the implant transducer. At the middle fossa, six pairs of screw holes were pre-drilled; four pairs to be used with self-tapping screws and lifts (1, 2, 3, and 4 mm thick lifts, respectively), one pair with self-tapping screws and no lifts, and one pair with self-drilling screws and no lifts. At the transmastoid and retrosigmoid locations, one pair of screw holes were pre-drilled in each for the use of the selftapping screws. The vibration of transmitted sound to the cochlea was measured using a laser Doppler vibrometry technique. The measurements were performed on the cochlear promontory at eight discrete frequencies (0.5, 0.75, 1, 1.5, 2, 3, 4 and 6 kHz). Vibration velocity of the cochlear wall was measured in all samples. Measurements were analyzed using a single-factor ANOVA to investigate the effect of each modification. Results: No significant differences were found related to either screw type, lift thickness, or implant location.

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“…So wird in der klinischen Audiometrie ein Anpress-druck des KLHG von mindestens 4N empfohlen [8,9]. Auch bei aktiven transkutanen KLHG unterscheidet sich die Stimulationseffizienz bei unterschiedlicher Befestigung des KLHG am Schädelknochen und ist neben der Anzahl an Fixationspunkten auch von der Größe der Kontaktfläche abhängig [10].…”

Section: Introductionunclassified

Experimentelle Evaluation des Adhear, eines neuen transkutanen Knochenleitungshörgeräts

Dobrev

Farahmandi

Huber

et al. 2020

Laryngorhinootologie

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Zusammenfassung Hintergrund Es sind unterschiedliche Knochenleitungshörgeräte (KLHG) verfügbar, die auf unterschiedliche Art mit dem Stimulationsort in Kontakt stehen. Ziel dieser Arbeit ist eine experimentelle Evaluation eines neuen transkutanen KLHG, das ohne Anpressdruck an die Haut angekoppelt wird. Material und Methoden Die Messungen wurden an einem Thiel-konservierten Ganzkopfkadaver durchgeführt. Zur Stimulation zwischen 0,1 und 10 kHz wurde ein Adhear verwendet, das über einen Signalgenerator und Verstärker direkt mit 1Vrms aktiviert wurde. Die Kopplung des KLHG erfolgte am Mastoid über ein Hautpflaster. Die Vibrationen des Schädels wurden am ipsi- und kontralateralen Promontorium und an der ipsi-, top- und kontralateralen Schädeloberfläche mittels 3D-Laser-Doppler-Vibrometers registriert. Insgesamt wurden ~200 Punkte auf der Schädeloberfläche (~15–20 mm Abstand) gemessen. Die Daten wurden mit entsprechenden Messungen verglichen, bei denen ein Baha Power als KLHG verwendet wurde. Dieses wurde am Mastoid über einen 5-Newton-Stahlbügel an die Haut gekoppelt. Ergebnisse Die ipsi- und kontralateralen promontorialen Vibrationen bei Stimulation mit dem Adhear sind in ihrer frequenzspezifischen Amplitude und Phase wie auch in der Zusammensetzung der Bewegungskomponenten mit der Stimulation mittels Baha Power am Stahlbügel vergleichbar. Ebenso erfährt die Schädeloberfläche unter beiden Ankopplungsarten eine vergleichbare komplexe räumliche Bewegung. Schlussfolgerungen Obwohl das Adhear ohne Anpressdruck und das Baha Power am Stahlband mit 5N an die Haut über dem Mastoid gekoppelt werden, unterscheiden sich die untersuchten Parameter kaum.

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Effect of transducer attachment on vibration transmission and transcranial attenuation for direct drive bone conduction stimulation

Cited by 18 publications

References 29 publications

Transcutaneous and percutaneous bone conduction sound propagation in single-sided deaf patients and cadaveric heads

Transcutaneous and percutaneous bone conduction sound propagation in single-sided deaf patients and cadaveric heads

The BONEBRIDGE active transcutaneous bone conduction implant: Effects of location, lifts and screws on sound transmission

Experimentelle Evaluation des Adhear, eines neuen transkutanen Knochenleitungshörgeräts

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