Bone Conduction Hearing Devices and Clinical Outcomes

Bone conduction hearing devices harness vibrations transmitted through the skull to stimulate the cochlea directly, bypassing the outer and middle ear. They are indicated for conductive and mixed hearing loss, single-sided deafness and cases where ear canal pathology precludes conventional hearing aids. Systems range from percutaneous implants, which require an abutment penetrating the skin, to transcutaneous solutions that preserve skin integrity by conveying sound across intact tissue. Recent developments focus on fully implantable sensors, miniaturisation and optimised coupling to bone. Clinical outcomes demonstrate substantial functional hearing gains, improved speech recognition in quiet and noise, enhanced sound localisation and high patient satisfaction, while complication rates have declined with less invasive designs.

Research from Nature Portfolio

Recent studies have employed advanced computational modelling to refine implant design and placement. One investigation utilised a finite element model of the temporal bone and inner ear to map directional sensitivity, revealing that stimulation perpendicular to key cochlear structures maximises bone vibration and fluid displacement. These insights guide surgical orientation to enhance amplification efficiency. A separate study prototyped miniaturised MEMS piezoelectric accelerometers coupled to the ossicular chain, achieving low equivalent input noise and broad bandwidth. This proof of concept supports the feasibility of fully implantable sensors that eliminate external hardware while maintaining sound fidelity.

Bone Conduction Hearing Devices and Clinical Outcomes publication trend

The graph below shows the total number of articles in bone conduction hearing devices and clinical outcomes across all publications each year (not limited to Nature Index journals).

Technical terms

Bone conduction: Transmission of sound to the cochlea via vibrations of the cranial bones.

Percutaneous implant: A device anchored through the skin, providing direct mechanical coupling between processor and bone.

Transcutaneous implant: A system delivering audio signals across intact skin by magnetic or inductive coupling, avoiding skin penetration.

Functional hearing gain: The improvement in hearing thresholds, measured in decibels, achieved with device activation.

Finite element model: A computational method dividing complex anatomical structures into discrete elements to simulate mechanical responses.

Piezoelectric accelerometer: A sensor employing piezoelectric materials to convert mechanical acceleration into electrical signals for sound detection.

References

1. Directional sensitivity of bone conduction stimulation on the otic capsule in a finite element model of the human temporal bone. Scientific Reports (2024).
2. Active transcutaneous bone conduction hearing implants: Systematic review and meta-analysis. PLOS ONE (2019).
3. Review of Bone Conduction Hearing Devices. Audiology Research (2021).
4. On the design of a MEMS piezoelectric accelerometer coupled to the middle ear as an implantable sensor for hearing devices. Scientific Reports (2018).
5. Medical, Technical and Audiological Outcomes of Hearing Rehabilitation with the Bonebridge Transcutaneous Bone-Conduction Implant: A Single-Center Experience. Journal of Clinical Medicine (2019).