NuVasive NVM5 Manual De Instrucciones página 24

WARNINGS AND PRECAUTIONS cont.
PRECAUTION: Avoid contact between any of the NVM5 System's electrical connections
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and any other conductive parts, including those connected to protective earth/ground.
PRECAUTION: Remain alert for audible indications of EMG-like activity as an indicator of
nerve trauma. Lack of audible feedback may indicate speaker system malfunction.
PRECAUTION: The NVM5 System will not be able to reliably detect EMG impulses on
channels degraded by noise. If an Impedance Test Error occurs, immediate attention
should be directed toward correcting the problem by checking the electrode placement,
securing the electrodes with tape, and eliminating any other sources of the noise. If
excessive ambient noise persists or if a noise error message appears, check the position
of all leads and electrodes, and position them as far away from other electronic equipment
as possible. Observe the EMG signals using the free run, or evoked potentials display to
determine the nature of the noise.
PRECAUTION: Poor electrode impedance may create susceptibility to electrical
interference, which can adversely affect system performance.
PRECAUTION: Connection of the NVM5 System to unapproved equipment may result in
dangerous levels of patient leakage currents. Use only approved NuVasive accessories
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with the NVM5 System. Do not use cables or accessories other than those provided with
the system.
PRECAUTION: Audible alert notification of spontaneous EMG events will not be
generated when the NVM5 System is used with the "Mute" setting activated. To receive all
possible audible alerts when using the NVM5 System, ensure that the "Mute" setting is not
activated.
PRECAUTION: Placement of recording electrodes within close proximity of one another
(less than one inch) may prevent the NVM5 System from recording differential responses.
To ensure differential responses can be recorded, position the recording electrodes at
least 1 inch from each other.
PRECAUTION: Avoid contaminating the passive reflective markers on the Array with any
liquid or solid materials to ensure the proper functioning of the Bendini System.
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PRECAUTION: Applying excessive force to the Digitizer when acquiring locations of
implants can result in inaccurate measurements due to movement of the patient anatomy.
PRECAUTION: The accuracy of data acquisition can be influenced through the non-
coaxial alignment of the Digitizer while registering points – consider keeping the alignment
of the Digitizer coaxial to the implant when registering its location in order to get the best
results.
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