Characteristics of Bone-Conduction Devices Simulated in a Finite-Element Model of a Whole Human Head.
You Chang, Stefan Stenfelt
PMID 30880644WHAT IT FOUND
Bone-conduction devices attached directly to bone produced greater inner-ear vibration at high frequencies than skin-attached devices in a head model.
The skin-attached Adhear was lowest across most frequencies. It was not a patient study.
Key findings
01In the model, devices attached directly to the skull bone produced the greatest cochlear vibration at high frequencies above 4 kHz, while skin-attached devices produced the lowest.
02With equal electrical input, the skin-attached Adhear produced the lowest cochlear vibration responses of all devices at most frequencies.
03The model reported that skin can attenuate high-frequency vibration by up to 20 dB, and that a small skin-contact area can reduce transmission; the paper said this vibration is not equal to hearing perception.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study did not include patients or measure hearing, speech, or language outcomes. It used a computer model based on an adult female head, so individual skull, skin, and anatomy differences were not tested. The authors said the modelled vibration responses are not equal to hearing perception and that small frequency-limited differences should not be interpreted as significant. The device models were simplified; screws, microphones, amplifiers, filters, and exact transducer designs were not fully included.
Declared interests
The paper lists funding from Stiftelsen Promobilia and Vetenskapsrådet. It did not report author financial disclosures or industry involvement.
The easy way to misread this
Do not conclude that a bone-attached device will improve hearing, speech, or language more than a skin-attached device. This was a computer model of a head, not a clinical study of patient outcomes.