Graeme Clark Collection

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http://hdl.handle.net/11343/375

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1993 - 1995 2
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Start date: 1990 × End date: 1999 × Subject: cochlear implant × Subject: otology × Type: Journal Article × Author: COHEN, LAWRENCE ×

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    Initial investigation of the efficacy and biosafety of sodium hyaluronate (healon) as an aid to electrode array insertion
    Donnelly, M. J. ; Cohen, L. T. ; Clark, Graeme M. ( 1995)
    Stimulation of residual neural elements by electrodes inserted into the cochlea to produce the perception of speech and environmental sounds in profoundly deaf people is a fundamental aim of cochlear implantation. The multiple-channel cochlear implant utilizes the tonotopic arrangement of the organ of Corti to also achieve place pitch perception by stimulating different electrode bands. It may be possible to improve the range of pitches perceived by present cochlear implant patients by inserting the electrode array more deeply. To help achieve this, investigators have used sodium hyaluronate as a lubricant for electrode insertions. 1 It was felt deeper insertions were produced with sodium hyaluronate. Before introducing this substance as part of the surgical protocol for the Melbourne Cochlear Implant Clinic, it was decided to investigate its efficacy in aiding deeper insertions of the electrode. In addition, it was also necessary to determine if sodium hyaluronate, in conjunction with cochlear implantation, had adverse effects on the inner ear. This study was undertaken to address these issues.
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    A portable programmable digital sound processor for cochlear implant research
    McDermott, Hugh J. ; Vandali, Andrew E. ; van Hoesel, Richard J. M. ; McKay, Colette M ; HARRISON, MARK ; Cohen, Lawrence T. ( 1993)
    A programmable sound processor which utilizes digital signal processing has been developed for hearing prosthesis research. It incorporates a Motorola DSP56001 integrated circuit, 32K words of memory, a 12 b analog-to-digital converter, and a data formatter and transmitter which conveys control codes to the receiver-stimulator of a cochlear implant. The processor is pocket-sized and battery powered. It has been programmed to emulate the Spectral Maxima Sound Processor for the University of Melbourne/Nucleus 22 electrode implant, and is currently being used by several implantees. In continuing research, speech processing programs are being improved, and other applications, including signal processing for binaural implants and advanced hearing aids, are being developed.