الفهرس 
INTRODUCTION AND AIM OF THE WORKOnly 14 pages are availabe for public view
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Abstract
In this study we will describe the implantable device and its mechanical characteristics. WE will explain our surgical approach for implantation in a rhesus monkey, and then discuss results of chronic implantation in rhesus monkey, colony.
From the previous results discussed we can state the following conclusions regarding the middle ear transducer.
** Safety: 1- No significant ABR threshold shift when comparing preoperative and postoperative acoustically generated ABR’s indicating no measurable conductive or SNHL in the implanted animals.
2- DPOAE’s obtained preoperatively and postoperatively demonstrating that implantation of the device does not cause a significant conductive hearing loss. DPOAE’s are obtainable only in normal or near normal ears and conductive hearing losses as small as 20 dB can result in non measurable distortion product responses.
** Efficacy: 1- Comparable auditory brainstem response L/I curve whether stimulus is delivered acoustically or mechanically demonstrates that comparable amount of energy are reaching the cochlea whether the stimulus is delivered acoustically or mechanically.
2- Comparable DPOAE 1/O and level functions whether f2 is delivered acoustically or mechanically demonstrate the frequency and intensity specificity of signal transduction through the implanted transducer.
** Longevity:
1- Ten animals with functioning transducers implanted longer than 6 months without any apparent degradation in ABR and DPOAE data. This demonstrates the durability and integrity of the transducers.