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Manufactured by: Medtronic Xomed, Inc.
NIM-ECLIPSE® SD System User’s Manual, Version 3.5.350
In the USA: Distributed by: Medtronic Sofamor Danek USA, Inc.
17 NERVE PROXIMITY
The Nerve Proximity Test Mode is designed to provide feedback to indicate proximity to a nerve root
during the early portions of the surgical procedure. The surgical instrument is connected to the Stim
Control or Instrument output of the Patient Interface Module and is electrified. The program
automatically changes stimulation intensity applied to the instrument while searching for an EMG
response.
The test begins immediately when the Nerve Proximity test mode is selected. Stimulation is applied
automatically and EMG responses to stimulation are monitored with parameters previously defined.
Responses found at lower stimulation intensities indicate the nerve is closer to the instrument site.
Audio feedback provides the indication of nerve proximity. High and low frequency tones indicate a nerve
near or more distance to the electrified instrument site respectively. Three different tone frequencies are
used to indicate the stimulus current intensity needed to evoke an EMG response. Tone Threshold Low
and Tone Threshold High parameters define the intensity levels at which the audio tone changes. When
the stimulus intensity decreases, the tone duration and the interval between the tones also decreases.
When the measured stimulation intensity is zero, the test Window displays free running and stimulus
triggered EMG as described in the EMG Test Window section. EMG activity with amplitudes greater than
the preset threshold will be displayed in similar, but lighter channel color. Audible EMG is not available.
Press Select > Settings to change the Nerve Proximity test parameters.
The screen is divided into four areas: EMG/Signal Triggered Trace Area, Stimulation Area, Body Graphic
Area, and Information Area.
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