A comparison of three approaches to verifying aided Baha output

Hodgetts, William E.; Hȧkansson, Bo; Hagler, Paul; Soli, Sigfrid D.

doi:10.3109/14992020903142676

Cited by 17 publications

(14 citation statements)

References 22 publications

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“…1, the group average of the 500 Hz thresholds was at least 5 dB worse than that of the 1,000 Hz thresholds. Hodgetts, et al [16] explained this as inherent low frequency noise of the BAHA because the inherent noise masks the aided thresholds at 250 and 500 Hz. This was also supported by Pfiffner, et al [17] in that physical characteristics of the sound processor provided a maximal output force at approximately 1 kHz.…”

Section: Discussionmentioning

confidence: 99%

Better Understanding of Direct Bone-Conduction Measurement: Comparison with Frequency-Specific Bone-Conduction Tones and Brainstem Responses

Kim¹,

Han²,

Park³

et al. 2020

J Audiol Otol

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Background and Objectives: The present study aimed to compare thresholds of direct bone-conduction (BC direct) with those of behaviorally measured BC pure-tone audiometry (PTA) and objectively measured BC auditory brainstem response (ABR) to confirm the clinical feasibility of their relationships.Subjects and Methods: Young adults with normal hearing participated in the study to determine the thresholds from three measurements at four testing frequencies. In the BC direct, the vibrator of a bone-anchored hearing aid softband was placed on the right mastoid of each subject. In both PTA and ABR, a B71 bone oscillator was placed on the subject’s right mastoid. While the subject’s thresholds of BC direct and BC PTA were determined with a clinically routine 5-dB step procedure, BC ABR was conducted to determine the individual’s hearing sensitivity by a peak V of the waveform using tone-burst and click stimuli.Results: The BC direct showed a different pattern between low and high frequencies. Precisely, its thresholds were 13.25 and 12.25 dB HL at 0.5 and 1 kHz, respectively, but 19 and 19.75 dB HL at 2 and 4 kHz, respectively. A significant positive correlation existed between BC direct and PTA at 1 kHz, which was also correlated with ABR.Conclusions: Based on the current data, the thresholds of BC direct were similar to BC PTA at low frequencies and BC ABR at high frequencies. The thresholds of BC direct might be predictable at approximately 5 dB higher (or lower) than that in PTA, although a large data set is required for standardization.

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Section: Discussionmentioning

confidence: 99%

Better Understanding of Direct Bone-Conduction Measurement: Comparison with Frequency-Specific Bone-Conduction Tones and Brainstem Responses

Kim¹,

Han²,

Park³

et al. 2020

J Audiol Otol

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“…The transducer developed for the BCI system is called the BCI transducer and uses a BEST as described by Håkansson [8]. Finally, the fitting procedures of the frequency response to compensate the patients' hearing loss will most likely also be improved in the future as discussed by Hodgetts et al [12,13]. As stated by Hodgetts, more detailed information about the patients' hearing on the implant is required.…”

Section: Percutaneous Bone Conduction -Direct Bone Conduction Systemsmentioning

confidence: 97%

“…Because of the inductive characteristic of the electrical input impedance, the HF range will have a roll-off by almost 20 dB per decade. However, it has also been pointed out that, from a clinical point of view, all present Baha should benefit from higher sensitivity and maximum power output (MPO) at higher frequencies [12,13]. Therefore, the attachment of the BEST transducer to the casing in the BCI has been designed to improve the sensitivity and the MPO at higher frequencies.…”

Section: Design Of the Implanted Transducermentioning

confidence: 98%

The Future of Bone Conduction Hearing Devices

Hȧkansson¹

2011

Advances in Oto-Rhino-Laryngology

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The bone-anchored hearing aid (Baha) is today an important rehabilitation alternative for patients with mixed and conductive hearing loss and where air conduction devices should not or cannot be used. Some patients with single-sided deafness are also successfully treated with a Baha. Despite successful treatment of these patient groups, there is always a need for future improvements. First, it is well known that Baha are associated with some drawbacks related to skin infections, accidental or spontaneous loss of the bone implant, and patient refusal for treatment due to stigma. Therefore, in this chapter some alternatives to the Baha which have the potential to reduce these drawbacks are generally discussed. They all have the common feature that they do not need a permanent skin penetration. The alternatives to the Baha are: (1) improved conventional bone conduction (BC) devices, (2) devices with an implanted transducer referred to as BC implants (BCI), (3) dental-attached devices. Disregarding skin complication issues, direct BC devices like the Baha, have a superior advantage of better sound quality in the high-frequency range. How these devices might be improved in the future is also discussed. Finally, some recent advances in the development of a new BCI system will be presented, where the implanted transducer uses a non-screw attachment to a hollow recess of the temporal bone. Some preclinical studies have been performed showing that a BCI system can provide similar or higher output as compared with a Baha.

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“…The sound processor needs to be fitted on the individual frequency-specific hearing loss. Therefore, the aided pure-tone audiogram serves as a control of the fitting [17–20]. …”

Section: Introductionmentioning

confidence: 99%

Objective Estimation of Frequency-Specific Pure-Tone Hearing Thresholds following Bone-Conduction Hearing Aid Stimulation

Rahne

Ehelebe

2014

The Scientific World Journal

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Patients suffering from conductive or mixed hearing loss may benefit from bone-conduction hearing systems (BAHS). The amount of amplification provided by the hearing system is selected based on the individual's sensorineural frequency-specific threshold. With patients who are not able to provide thresholds behaviorally, such as young children, objective methods are required to estimate the unaided and aided hearing threshold and thus the success of the hearing system fitting. In a prospective study with ten adult Baha softband users, aided and unaided frequency-specific thresholds were estimated. Aided thresholds to tone bursts via Baha stimulation were obtained behaviorally and electrophysiologically using cortical auditory evoked potentials (CAEPs) and were compared to pure-tone thresholds using routine clinical audiometry. For all stimulation frequencies, the frequency-specific electrophysiological and behavioral hearing thresholds measured with Baha stimulation were highly correlated and not different. Increased thresholds were observed only with the 0.5 kHz Baha stimulation as compared to the pure-tone audiogram. Objective measurement of frequency-specific hearing thresholds with CAEPs is applicable to BAHS users.

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A comparison of three approaches to verifying aided Baha output

Abstract: The Real Head Acceleration Level appears to be the most accurate method of determining aided audibility with the Baha.

Cited by 17 publications

References 22 publications

Better Understanding of Direct Bone-Conduction Measurement: Comparison with Frequency-Specific Bone-Conduction Tones and Brainstem Responses

Better Understanding of Direct Bone-Conduction Measurement: Comparison with Frequency-Specific Bone-Conduction Tones and Brainstem Responses

The Future of Bone Conduction Hearing Devices

Objective Estimation of Frequency-Specific Pure-Tone Hearing Thresholds following Bone-Conduction Hearing Aid Stimulation

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