Users Manual Part 1

28
Nerve Integrity Monitor
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2
3
4
5
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7
1 Settings button.
2 Audio panel.
3 Stimulus Delivery Audio.
4 Monitoring EMG Audio:
• EMG Audio.
• Event Tones.
• Voice - Stimulated EMG Values.
• Show Channel Mute Button.
5 Volume Balance:
• EMG Audio Volume Balance.
• Event Tones Volume Balance.
• Voices Volume Balance.
6 Audio Advanced Settings.
7 Active Stimulus Only.
Additional options for the Stimulus Delivery Audio panel (3):
• Brief Tone (default). Delivery of stimulus current is accompanied by a brief warbled tone.
• Continuous Tone. Delivery of stimulus current is accompanied by a continuous, warbled, high-low tone (referred to as “Stimulus
Warble Tone”).
• Voice - Stimulus. Delivery of current to the surgical eld is announced by the word, “STIMULUS”.
• Voice - Setting. Delivery of current to the surgical eld is announced by the value of the stimulus setting.
Note: You will not hear the Stimulus Delivery Audio when an event has occurred.
The following options are located on the Monitoring Audio panel. At least one selection must be active, however you may select
both options.
• EMG audio is the amplied sound of muscle activity that is heard instantaneously as the nerve is stimulated. All EMG activity,
regardless of amplitude, is audible when the EMG audio is ON. The EMG activity may sound like a low-pitched “drumbeat”, a high-
pitched “crackle,” or a “growl”. When you monitor multiple channels, it is unlikely that you will be able to dierentiate the EMG
signals as to their channel of origin strictly by the sounds they produce.
• Event Tones are heard when the EMG amplitude is larger than the Event Threshold setting. The Event Tones are easily heard over
O. R. noise and are heard at the same time with the EMG audio, previously mentioned.
• “Voice – Stimulated EMG Values” announces the value of the highest channel in the largest event in a sequence if largest
is selected in Display settings (approximately one second after the sequence ends). The system rounds the actual value
appropriately for annunciation. For example, the NIM Vital system would announce 623 as “six hundred twenty.”
You can dierentiate channels by tone pitch. The tone for channel 1 activity is lower in pitch than channel 2, and so on for channels
3 through 4. When EMG activity exceeding the event threshold occurs at the same time on multiple channels, only the tone of the
channel with the highest EMG activity will be produced.
You can mute individual EMG channels by selecting Show Channel Mute Buttons.
Once the user enables a monitoring audio option (EMG Audio, Event Tones, or Voice - Stimulated EMG Values), the system displays a
volume balance for the option. All of the balances in this panel default to 50%.
Audio advanced settings
On the Audio advanced settings panel the user can toggle on/o Audio during Active Stimulus Only. When the user enables the
Active Stimulus Only, the system mutes the EMG audio and event tones occurring without stimulation. This mode only works with
compatible, connected stimulators.
Display Settings panel
Note: If you adjust the advanced settings, you will change the default characteristics of your NIM Vital. Only someone with
knowledge of the advanced settings and how they impact your NIM Vital should make changes. If the user selects
, the system
displays a warning. The user must select [Cancel] or [Conrm] to return to settings or move forward to the advanced settings panel.
FCC use only, not for Medical use