MIDDLE EAR IMPLANTS

Principles

Vibrate ossicular chain by electromagnetic or piezoelectric means.
-direct transmission of mechanical energy of amplified sound vibrations to ossicular chain.
-MEI is coupled to ossicular chain or OW, eliminating acoustic coupling via EAC.

Conversion of electric to mechanical energy by 2 mechanisms–

Electromagnetic (em): max output 140 dBSPL
Piezoelectric (PZ): max output 110 dBSPL
Impedance of electromagnetic implant is 1/5 that of piezoelectric crystal

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