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Acta Neurochir (Wien) ; 138(4): 470-4, 1996.
Article in English | MEDLINE | ID: mdl-8738399

ABSTRACT

To facilitate use of various stimulation modes for intra-operative monitoring during neurosurgical procedures, we designed and produced a variable stimulation system that consists of a coaxial bipolar flush-tip insulated stimulation electrode, and a switch box to administer monopolar or bipolar stimulation through the same stimulation electrode. The electrode is composed of components that are readily available, so that its construction can be duplicated by others at minimal expense. For mapping of neural tissue during surgical procedures, we use the monopolar stimulation mode to identify relative large areas around the site of stimulation which are free of motor nerve fibres. The bipolar stimulation mode is most useful for precise localization of motor nerve fibres and in distinguishing motor from non-motor fibres.


Subject(s)
Brain Mapping/instrumentation , Electric Stimulation/instrumentation , Electrodes , Monitoring, Intraoperative/instrumentation , Brain Neoplasms/physiopathology , Brain Neoplasms/surgery , Brain Stem/physiopathology , Brain Stem/surgery , Cauda Equina/physiopathology , Cauda Equina/surgery , Cranial Nerves/physiopathology , Cranial Nerves/surgery , Equipment Design , Humans , Motor Neurons/physiology
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