Graeme Clark Collection

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1983 - 1990 3
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Type: Conference Paper × Author: Clark, Graeme × Author: Franz, Burkhard ×

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    The implanted round window membrane in the cat [Abstract]
    Franz, B. ; Clark, Graeme M. ; Ng, J. ; Bloom, D. (Monash University Press, 1983)
    In cochlear implants the round window is convenient for the electrode insertion into the scala tympani because the surgical approach is reasonably easy and the inserted electrode lies close to systematically organised nerve fibres in the spiral lamina. However, complications might occur when a poor seal, extensive tissue damage or surgical asepsis are present that lead to a reduction in the nerve fibre population which is needed for electrical stimulation. Published articles available do not describe the role of the window membrane in cochlear implants. Probably this can be referred to the finidng of abundant scar tissue in the window niche and around the electrode giving the impression of a safely implanted electrode. This study performed on seven cats over 5 months was concerned with morphological properties of the implanted window membrane at different stages after implantation. In addition, horseradishperoxydase was used as a tracersubstance to give data concerning the sealing properties of the implanted round window membrane.
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    Preliminary results with a miniature speech processor for the 22-electrode Melbourne/Cochlear hearing prosthesis
    Dowell, Richard C. ; Whitford, Lesley A. ; Seligman, Peter M. ; Franz, Burkhard K.-H. G. ; Clark, Graeme M. (Kugler & Ghedini, 1990)
    The 22-electrode cochlear prosthesis developed by the University of Melbourne in conjunction with Cochlear Pty Ltd has been used successfully by profoundly deaf patients since 1982 and is now a part of everyday life for some 2000 people in many countries around the world. The implanted part of the prosthesis has remained relatively unchanged in this time except for the alteration of the design in 1986 to incorporate an implanted magnet and reduce the overall thickness of the device. The implanted magnet eliminated the need for wire headsets which were difficult to fit and in some cases did not maintain the position of the external transmitter coil adequately. This was felt to be essential before the prosthesis could be used in young children.
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    The histopathology of the human temporal bone following cochlear implantation in a patient: a summary
    Clark, Graeme M. ; Shepherd, R. K. ; Webb, R. L. ; Franz, B. K-H. ( 1987)
    The macroscopic and microscopic evaluation of the implanted and unimplanted temporal bones in a patient who had a cochlear prosthesis for 27 months prior to his death from cardiac disease has shown that the device is biocompatible, and does not lead to any significant adverse effects. The cause of deafness was meningitis.