Graeme Clark Collection

Permanent URI for this collection

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

Filters

1984 - 1988 3
3
Reset filters

Settings
Statistics
Citations
Author: PYMAN, BRIAN × Author: Shepherd, Robert × End date: 1989 × Start date: 1980 × Subject: otology ×

Search Results

Now showing 1 - 3 of 3
  • Item
    Thumbnail Image
    The biologic safety of the Cochlear Corporation multiple-electrode intracochlear implant
    Webb, Robert L. ; Clark, Graeme M. ; Shepherd, Robert K. ; Franz, Burkhard K-H. ; Pyman, Brian C. ( 1988)
    Studies have been undertaken to confirm the biologic safety of the Cochlear Corporation multi-electrode intracochlear implant. The materials used are biocompatible. The electrode array is flexible: it can be inserted with minimal or no trauma, providing the insertion is stopped when resistance is first felt. An atraumatic insertion is facilitated if a good view is obtained along the scala tympani of the basal turn of the cochlea by drilling through the crista fenestrae. The passage of the electrode around the cochlea can be facilitated if the electrode is rotated during insertion (clockwise for the left and anticlockwise for the right cochlea). The electrode can be explanted and another one reinserted with minimal or no trauma. A seal established around the electrode after an implantation period of 2 weeks can prevent infection extending from the middle to the inner ear. The electrical stimulus parameters produced by the Nucleus receiver-stimulator cause no loss of spiral ganglion cells or corrosion of the platinum band electrodes. Long-term stimulation has been carried out for up to 8 years in patients without affecting their clinical performance.
  • Item
    Thumbnail Image
    Surgery for the safe insertion and reinsertion of the banded electrode array
    Clark, Graeme M. ; Pyman, B. C. ; Webb, R. L. ; Franz, B. K-H. G. ; Redhead, T. J. ; Shepherd, R. K. ( 1987)
    Adhering to the surgical technique outlined in the protocol for the Nucleus implant has resulted in over 100 patients worldwide obtaining significant benefit from multichannel stimulation. A detailed analysis of the results in 40 patients shows that it improves their awareness of environmental sounds and their abilities in understanding running speech when combined with lipreading. In addition, one third to one half of the patients also understand significant amounts of running speech without lipreading and some can have interactive conversations over the telephone. It is clear that any insertion trauma is not significant, which is confirmed by the excellent clinical results.
  • Item
    Thumbnail Image
    Surgery for an improved multiple-channel cochlear implant
    Clark, Graeme M. ; Pyman, Brian C. ; Webb, Robert L. ; Bailey, Quentin E. ; Shepherd, Robert K. ( 1984)
    An improved multiple-channel cochlear implant has been developed. The titanium container with enclosed electronics, the receiver coil and the connector are embedded in medical-grade Silastic. The upper half of the implant has a diameter of 35 mm and a height of 4.5 mm. and the lower half a diameter of 23 mm and a height of.5 mm. The electrode array has also been designed to reduce the possibility of breakage due to repeated movements over many years. The surgery involves drilling a bed in the mastoid bone for the receiver-stimulator, and fixing the proximal electrode under the mastoid cortex. Gentle insertion of the electrode array through the round window and along the seala tympani is achieved with a specially designed microclaw.