Graeme Clark Collection

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Author: Shepherd, Robert × Author: Xu, Jin × End date: 1999 × Start date: 1990 × Subject: otolaryngology × Subject: paediatric otology ×

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    Paediatric cochlear implantation: radiologic observations of skull growth
    XU, JIN ; Shepherd, Robert K. ; Xu, Shi-Ang ; Seldon, H. Lee ; Clark, Graeme M. ( 1993)
    We investigated the effects of long-term implantation of auditory prostheses on skull growth in young animals. Four monkeys were implanted with dummy cochlear implants at 6 months of age. To simulate implantation in children, the bed for the receiver-stimulator or interconnecting plug was drilled across a calvarial suture down to the underlying dura. Plain skull oentgenograms were periodically taken to monitor head growth for up to 3 years after implantation. These longitudinal measurements revealed no significant asymmetric skull growth. Postmortem measurements using computed tomographic scans confirmed these results and showed no significant difference in the intracranial volumes between the implanted and control sides of each animal or between experimental and nonimplanted control monkeys. These results suggest that long-term cochlear implantation in very young children will not cause any significant deformity of the skull.
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    Cochlear implantation in young children: studies on head growth, leadwire design and electrode fixation in the monkey model [Abstract]
    Burton, Martin J. ; Xu, J. ; Shepherd, R. K. ; Xu, S-A. ; Seldon, H. L. ; Franz, B. K-H. G. ; Clark, Graeme M. ( 1992)
    For the safety of cochlear implantation in children under two, the implant assembly must not adversely effect the tissue of compromise head growth. Furthermore, growth changes and tissue responses should not impair functioning of the device. Dummy receiver-stimulators, interconnect plugs and leadwire-lengthening systems have been implanted for periods of 40 months in the young monkey to most effectively model the implantation of the young human child. The results show that implanting a receiver-stimulator package has no effect on skull growth or brain tissue under the package. The system for fixing the electrode at the fossa includes proved effective. There was marked osteoneogenesis in the mastoid cavity and this also resulted in fixation of the leadwire outside the cochlea. This study provides evidence for the safety of cochlear implantation in young children.