Troubleshooting 85
RNS
®
System User Manual
• View the real-time ECoGs to verify that the signal is sufficient and without noise or
artifacts.
• Repeat impedance measurements.
Note: If the abnormal impedance is associated with the same electrode label, then the
problem may be with the lead.
Depth lead - Impedance > 3500 Ohms
• The depth lead may be damaged and should be replaced. Refer to the
Changing the Leads that are connected to the Neurostimulator section
in this manual.
Depth lead - Impedance < 250 Ohms
• The depth lead may be damaged and should be replaced. Refer to the
Changing the Leads that are connected to the Neurostimulator section
in this manual.
Cortical strip lead - Impedance > 3500 Ohms
• The high impedance may be due to air.
• Irrigate the area around the cortical strip lead and examine the geometry.
• Repeat impedance measurements.
• If the impedance remains abnormal, the cortical strip lead may be damaged
and should be replaced. Refer to the Changing the Leads that are
connected to the Neurostimulator section in this manual.
Cortical strip lead - Impedance < 250 Ohms
• The cortical strip lead may be damaged and should be replaced. Refer to the
Changing the Leads that are connected to the Neurostimulator section
in this manual.
Note: If the abnormal impedance is not associated with the same electrode label, the
problem may be with the neurostimulator or connector cover.
6. Replace the connector cover.
• Disconnect the leads from the connector cover and reconnect the leads to a new
connector cover. Connect to the neurostimulator and troubleshoot according to the
instructions in the Noise, Artifacts, Poor Signal Displayed, or No Signal
Displayed in Real-time ECoG section of this manual.
• View the real-time ECoGs to verify that the signal is sufficient and without noise or
artifacts.
• Repeat impedance measurements.
7. If the impedance remains abnormal, replace the neurostimulator. Refer to the Replacing
/ Explanting the RNS® System section in this manual.
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