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Related Concept Videos

The Cochlea01:13

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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Ocular VEMP Using Bone Conduction Stimuli at the Forehead - A Pilot Study Comparing B250, Minishaker and Tendon Hammer with Vibrometry Validation.

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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Objective verification of audibility in bone conduction devices.

Ann-Charlotte Persson1,2, Bo Håkansson3, Karl-Johan Fredén Jansson3

  • 1Department of Otolaryngology, Head and Neck Surgery, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.

International Journal of Audiology
|April 11, 2024
PubMed
Summary

A novel skin microphone effectively measures audibility in patients with bone conduction devices (BCDs). This method verifies improved speech understanding after BCD adjustments, offering a promising clinical tool for all BCD types.

Keywords:
Bone conduction devicesaudibilityhearing rehabilitationobjective verificationskin microphone

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Hearing Device Technology

Background:

  • Bone conduction devices (BCDs) are crucial for hearing rehabilitation.
  • Objective audibility measurement in BCD users presents unique challenges.
  • Current methods may not fully capture real-world audibility with BCDs.

Purpose of the Study:

  • To introduce and evaluate a novel method for objectively measuring audibility in patients using bone conduction devices (BCDs).
  • To assess the efficacy of a skin microphone placed on the forehead for this purpose.
  • To validate the method's utility across different types of BCDs in a clinical setting.

Main Methods:

  • A skin microphone was attached to the forehead using a softband and shielded with an earmuff.
  • The setup was validated to exclude noise floor and sound bypassing the BCD.
  • Aided hearing thresholds, maximum power output (MPO), and speech intelligibility using the International Speech Test Signal (ISTS) were measured in 29 patients across various BCD types.

Main Results:

  • The skin microphone successfully obtained audibility measurements (hearing threshold, MPO, ISTS levels) in all 29 patients.
  • Two patients with initially poor audibility demonstrated significant improvement after BCD gain adjustments, verified by the skin microphone and speech-in-noise tests.
  • The method proved reliable for assessing audibility changes post-adjustment.

Conclusions:

  • The proposed skin microphone measurement technique is a viable and promising method for objectively assessing audibility in patients with bone conduction devices (BCDs).
  • This approach is suitable for use in clinical settings and applicable to all types of BCDs.
  • The findings support the use of this technique for optimizing BCD fitting and verifying hearing improvements.