Effect of fixation place on airborne sound in cartilage conduction

Nishimura, Tadashi; Hosoi, Hiroshi; Saito, Osamu; Akasaka, Sakie; Shimokura, Ryota; Yamanaka, Toshiaki; Kitahara, Tadashi

doi:10.1121/10.0001671

Cited by 10 publications

(12 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the cartilage-AC characterizes the acoustic properties of CC. The effect of water in the ear canal was also evaluated at 500-2000 Hz for five different placements of the transducer: the tragus, intertragal incisure, anti-tragus, pre-tragus, and mastoid [19]. Among the CC conditions (tragus, intertragal incisure, and anti-tragus), the results showed the same amount of threshold shifts when water was injected into the ear canal, and the fixation placement did not affect the threshold shifts by water injection.…”

Section: Threshold Shift With Water Injected Into the Ear Canalmentioning

confidence: 99%

Cartilage Conduction Hearing and Its Clinical Application

et al. 2021

Self Cite

View full text Add to dashboard Cite

Cartilage conduction (CC) is a form of conduction that allows a relatively loud sound to be audible when a transducer is placed on the aural cartilage. The CC transmission mechanism has gradually been elucidated, allowing for the development of CC hearing aids (CC-HAs), which are clinically available in Japan. However, CC is still not fully understood. This review summarizes previous CC reports to facilitate its understanding. Concerning the transmission mechanism, the sound pressure level in the ear canal was found to increase when the transducer was attached to the aural cartilage, compared to an unattached condition. Further, inserting an earplug and injecting water into the ear canal shifted the CC threshold, indicating the considerable influence of cartilage–air conduction on the transmission. In CC, the aural cartilage resembles the movable plate of a vibration speaker. This unique transduction mechanism is responsible for the CC characteristics. In terms of clinical applications, CC-HAs are a good option for patients with aural atresia, despite inferior signal transmission compared to bone conduction in bony atretic ears. The advantages of CC, namely comfort, stable fixation, esthetics, and non-invasiveness, facilitate its clinical use.

show abstract

Section: Threshold Shift With Water Injected Into the Ear Canalmentioning

confidence: 99%

Cartilage Conduction Hearing and Its Clinical Application

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…On attaching a transducer on the aural cartilage, the patient is able to perceive loud sounds [ 11 ], and this conduction, termed cartilage conduction (CC), has characteristics different from those of conventional AC and BC [ 12 , 13 , 14 , 15 , 16 ]. CC hearing aids are new, innovative hearing devices utilizing CC, which address the issues concerning the fixation of BC hearing aids and require no surgical intervention [ 17 , 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Benefits of Cartilage Conduction Hearing Aids for Speech Perception in Unilateral Aural Atresia

et al. 2021

Self Cite

View full text Add to dashboard Cite

Severe conductive hearing loss due to unilateral aural atresia leads to auditory and developmental disorders, such as difficulty in hearing in challenging situations. Bone conduction devices compensate for the disability but unfortunately have several disadvantages. The aim of this study was to evaluate the benefits of cartilage conduction (CC) hearing aids for speech perception in unilateral aural atresia. Eleven patients with unilateral aural atresia were included. Each participant used a CC hearing aid in the atretic ear. Speech recognition scores in the binaural hearing condition were obtained at low speech levels to evaluate the contribution of aided atretic ears to speech perception. Speech recognition scores were also obtained with and without presentation of noise. These assessments were compared between the unaided and aided atretic ear conditions. Speech recognition scores at low speech levels were significantly improved under the aided atretic ear condition (p < 0.05). A CC hearing aid in the unilateral atretic ear did not significantly improve the speech recognition score in a symmetrical noise presentation condition. The binaural hearing benefits of CC hearing aids in unilateral aural atresia were predominantly considered a diotic summation. Other benefits of binaural hearing remain to be investigated.

show abstract

“…1 Threshold shifts by an earplug or water injection into the ear canal clarified the differences in the characteristics from conventional AC and BC. [2][3][4] The sound transmission pathway to the cochlea in CC is theoretically considered to be three pathways: direct-AC, cartilage-AC, and cartilage-BC, in which the cartilage-AC characterizes the unique acoustic features of CC. The contribution of these three components varies in the condition of the external and middle ears.…”

mentioning

confidence: 99%

Cartilage Conduction Hearing Aid Fitting in Clinical Practice

Nishimura

Hosoi

Sugiuchi³

et al. 2021

J Am Acad Audiol

Self Cite

View full text Add to dashboard Cite

Background Cartilage conduction hearing aids (CCHAs) were newly devised and spread fast in Japan since their launch in 2017. However, little knowledge is available for this new device. Purpose The aim of this study was to establish the knowledge of CCHAs and suggest their indication. Research Design Correlational study. Study Sample A total 256 patients were registered. Data Collection and Analysis The fitting of CCHAs was surveyed in nine institutions. The outcomes were assessed by audiometric tests. The patients were classified into seven groups, depending on the ear conditions. The clinical characteristics, assessment results, and purchase rates were compared among the groups. The assessment results of CCHAs were also compared with those of previously used hearing aids. Results Most patients who used CCHAs were classified into the bilateral closed (aural atresia or severe stenosis) ear (n = 65) or unilateral closed ear (n = 124) groups. The patients in these groups achieved good benefits that resulted in a high purchase rate. The bilateral continuous otorrhea group also supported a high purchase rate, although the benefits of CCHAs were not always excellent. In contrast, the purchase rate was poor in the patients who could use air conduction hearing aids (ACHAs) without absolute problems. As for using a CCHA as a contralateral routing of signals hearing aid, the benefits depended on the patients. Conclusions CCHAs are considered as a great option not only to the patients with closed ears but also to those who had difficulties in ACHAs usage.

show abstract

Effect of fixation place on airborne sound in cartilage conduction

Cited by 10 publications

References 19 publications

Cartilage Conduction Hearing and Its Clinical Application

Cartilage Conduction Hearing and Its Clinical Application

Benefits of Cartilage Conduction Hearing Aids for Speech Perception in Unilateral Aural Atresia

Cartilage Conduction Hearing Aid Fitting in Clinical Practice

Contact Info

Product

Resources

About