Graeme Clark Collection

Permanent URI for this collection

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

Filters

1995 - 1999 3
Reset filters

Settings
Statistics
Citations
Author: COHEN, LAWRENCE × End date: 1999 × Start date: 1991 × Subject: electrode array × Subject: otolaryngology ×

Search Results

Now showing 1 - 3 of 3
  • Item
    Thumbnail Image
    Is deep insertion of the cochlea implant electrode array necessary and possible?
    Donnelly, M. J. ; Cohen, L. T. ; Clark, Graeme M. ( 1995)
    Hyaluronate (Healon TM) appears to be useful in achieving deeper electrode insertions than are generally achieved at present. However, biosafety studies are still being conducted. If found to be a safe technique, further work to explore different electrical stimulation strategies and speech processing schemes will also need to be undertaken. This work is ongoing.
  • Item
    Thumbnail Image
    Insertion study using new peri-modiolar electrode array designs [Abstract]
    Treaba, Claudiu ; Clark, Graeme M. ; Cowan, Robert S. ; Tykocinski, Michael J. ; Cohen, Lawrence T. ; Saunders, Elaine ; Pyman, Brian C. ; Briggs, Robert S. ; Dahm, Markus C. ( 1999)
    Intracochlear multi-channel cochlear implants have been shown to successfully provide auditory information for profoundly deaf patients by electrically stimulating discrete populations of auditory nerve fibers via a scala tympani (ST) electrode array. Histological and radiological examination of implanted human temporal bones showed that the current straight Nucleus® array is usually positioned against the outer wall of the ST. An electrode array close to the modiolus could be expected to reduce stimulation thresholds and result in a more localized neural excitation pattern.
  • Item
    Thumbnail Image
    The development of a precurved cochlear implant electrode array and its preliminary psychophysical evaluation [Abstract]
    Cohen, L. T. ; Saunders, E. ; Treaba, C. ; Pyman, B. C. ; Clark, Graeme M. ( 1998)
    A precurved banded electrode array may provide a better interface with the auditory neural pathways for cochlear implants, and provide better speech perception. A prototype arrray has been further evaluated for ease of insertion, siting within the cochlea and induction of any cochlear trauma. The arrays were inserted into the human cochlear under simulated surgery. The bones were embedded in Araldite, X-rayed and sectioned. X-ray reconstruction analyses of the position of the implanted array showed its insertion to be favourable. Cochlear implants with precurved arrays have been implanted in three patients. Psychophysical evaluation and X-ray analyses have shown that as electrode distance from the modiolus decreased: threshold current decreased; dynamic range increased; current spread as measured by forward masking studies, was more focused; electrode discrimination with loudness jitter (being abetter representation of the dynamic speech signal) improved; JNDs for loudness, expressed as a function of dynamic range, decreased.