Chapter 1 12 2. Compression, deformation, and distortion of the cochlear wall via direct vibration effect [9] 3. Sound energy vibration of soft tissues of external ear and middle ear ossicles. This is transmitted to the cochlear via the stapes footplate [10]. As the ossicular chain is suspended between the annular ligament and the tympanic membrane the movement is dependent on the frequency and is reduced above the ossicular chain’s resonant frequency. 4. Pressure transmission from the cerebrospinal fluid 5. Sound transmission through the external ear canal These fundamental physiological principles are capitalised on in the application of BCHD in modern audiological rehabilitation and over time significant technological developments have enabled rapid progression in design and application. [Figure 1] Figure 1: Vibration pathway from processor to inner ear. Application of hearing physiology in BCHD BCHD are comprised of two parts, a processor that converts sound to a digital signal and a mount or attachment connecting this device to the overlying skin or directly to the temporal bone.
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