VNS Therapy SENTIVA M2000 Wand, Technical Manual

Page: 74 / 81

74
High/Low Lead Impedance and
Low Output Current Issues
HIGH LEAD IMPEDANCE IN THE OR
If a System Diagnostics test results in high lead impedance, the following are
possible causes:
• Improper connection between the lead and the generator
• Incorrect placement of lead on the nerve (initial implant only)
• Allowing nerve to become dry (initial implant only)
• Defective lead or generator
Lead Impedance “HIGH”
Verify Lead Insertion into Generator
• Back out setscrew(s), remove lead pin(s), and leave the hex screwdriver engaged in
setscrew(s)
• Verify the setscrew(s) is not visible in the lead receptacle(s)
• Insert connector pin(s) and tighten setscrew(s) until the hex screwdriver clicks
• Confirm the lead pin(s) is past the back end of the connector block
• For single-pin generators, verify the end of the connector ring is inside of the lead
receptacle
• For Initial Implant: Irrigate dry nerve site and remove pooled fluid if necessary
• Verify proper lead electrode placement on the nerve
• Retry System Diagnostics
Troubleshoot Generator
• Back out setscrew(s) and remove lead pin(s)
• Insert test resistor into generator and tighten
setscrew(s) with hex screwdriver until the
screwdriver clicks
• Select
MORE TROUBLESHOOTING
on the programmer
• Select
GENERATOR DIAGNOSTICS - START
on the
programmer
Reinsert Lead into Generator
• Back out setscrew(s) and remove test resistor
• Verify the setscrew(s) is not visible in the lead receptacle(s)
• Engage the hex screwdriver in the setscrew(s)
• Insert connector pin(s) and tighten setscrew(s) until the hex
screwdriver clicks
• Visually inspect the lead receptacle(s) and verify that the lead
pin(s) is past the back end of the connector block(s)
• Retry System Diagnostics
Proceed with implant
Proceed with implant
Contact LivaNova Technical Support
“Ok”
Lead Impedance
Value?
Lead Impedance
Value?
Lead Impedance
Value?
Error Message
“High”
“Ok” “High”
“High”
“Ok”