8-4
ClosureRFG Radiofrequency Generator
Technical Assistance
RF Treatment Difficulties - ClosureRFS Endovenous Radiofrequency Stylet
ClosureFast
Catheter
Difficulty
Possible Cause
Corrective Action
Impedance low
Inadequate
electrode-vein wall
contact
Improve or employ vein compression techniques.
Saline in device
connector and/or
receptacle
Check for presence of saline. If present, contact
Covidien Customer Service. (Caution: Take care
never to plug a wet catheter connector into the
receptacle, as this may damage the ClosureRFG
radiofrequency generator.)
Short circuit
Replace stylet.
Impedance high
Coagulum formation
on electrodes
Check stylet tip for coagulum and remove as
required.
Stylet not in contact
with target tissue
Verify that the stylet is properly positioned.
Open circuit
Check stylet connection (disconnect and then
reconnect). Replace stylet.
Power high
Too much blood flow
Pullback rate too fast
Check and improve exsanguination. Verify proper
pullback rate.
Temperature low
Inadequate vessel
exsanguination
Verify that the device is properly positioned. Check
for flow, and employ or improve compression
techniques as necessary.
Pullback rate too fast
Verify proper pullback rate.
Saline in device
connector
Check for presence of saline. If present, contact
Covidien Customer Service. (Caution: Take care
never to plug a wet catheter connector into the
receptacle, as this may damage the RF generator.)
Stylet, cable, or
connector is
damaged
Check all connections, cable, and the stylet for
visible damage. Replace stylet.
Temperature
high
Saline in stylet
connector
Check for presence of saline. If present, contact
Covidien Customer Service. (Caution: Take care
never to plug a wet device connector into the
receptacle, as this may damage the RF generator.)