Users Manual Part 1

52
Nerve Integrity Monitor
Charging the patient interface box
The primary purpose of the console battery is to recharge the patient Interface box batteries when the system is unplugged from
the electrical wall outlet or while the system is turned on, in-use and patient interface boxes are connected to the console through
the patient interface cable. The console battery is designed to fully charge two 4-channel patient interface boxes when the system
is powered down. During the patient interface charging process the power button will ash until the patient interfaces are charged
and the console completely shuts down and the power button will no longer ash. PI need to be docked within ve minutes after
removing Mains power to initiate PI charging. The system will remain in stand-by mode (ashing power button).
The secondary purpose of the console battery is to serve as a backup power supply should the system lose wall power either
accidentally or intentionally such as moving the system to another part of the operating theater.
Loss of power during surgery
The secondary purpose of the console battery is to act as backup power should the system lose Mains power either accidentally or
intentionally. for example, when moving the system to another area of the operating theater.
The system is designed to continue monitoring when unplugged for a minimum of ve minutes to allow time for reconnection to
Mains power or moving the system to another location and reconnecting to power. If the system is disconnected from mains power
during use, the system displays the following caution message on the screen and an alarm sounds to indicate the system has been
unplugged.
The user may clear the warning and alarm to continue using the NIM Vital during while unplugged; however, a second warning and
alarm occurs after four minutes indicating that the system will shut down in one minute if mains power is not restored.
Console battery charging
The system automatically charges the console battery any time it is plugged into the mains power and adequately charges the
console battery to 100% after approximately two hours of continuous power application, or if left plugged into the wall between
surgical procedures.
Using the console with no battery installed
If the console battery is not installed in the NIM Vital system or has reached the end of its life, the system displays a warning message
that the user may clear to continue with normal monitoring. The system still functions as a nerve monitor but does not have
the backup capability and shuts down when unplugged. Additionally, the console will not be capable of recharging the patient
interface boxes once the system is unplugged from the wall.
Troubleshooting
Symptom Cause Solution
1
Error message appears on screen.
Examples:
• No communication
• Self-test failure
Internal NIM communication error or malfunction
Turn NIM power button o, wait ve seconds and then turn
it on again. If issue persists, contact Medtronic customer
service
2
Electrode impedance is too high.
> 10KΩ for subdermal electrodes.
> 25KΩ for Prass paired electrodes.
> 7.5 KΩ for EMG tube.
> 40KΩ for hookwire electrode.
Electrode dislodged from patient, but not completely
out.
Insert dislodged electrode; tape down in place.
High resistance in electrode. Remove and replace with new electrode.
Electrode pin not rmly inserted into patient interface. Check connection at Patient Interface box.
3
No artifact response or sound is evoked if
an electrode “Tap Test” is conducted.
The NIM artifact lter typically removes this type of
artifact.
The “Tap Test” to evoke artifact is not reliable and does
not conrm proper electrode or EMG tube placement and
therefore not recommended.
4
Electrode impedance is too low (≤0.1KΩ).
Positive and negative electrodes touching below
surface of skin.
Remove and relocate electrodes.
Extremely low impedance may be observed in a
normally functioning EMG tube.
This is normal. No action required.
FCC use only, not for Medical use