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Physician’s Manual — VNS Therapy Programming Software (8.1)
Caution:
During a System Diagnostic for Model 103, 104, and 105
Pulse Generators, a test pulse of 0.25mA is first used to assess the
Lead impedance. After the Impedance assessment, the behavior of the
diagnostic test is dependent upon the value of the output current
programmed in the Pulse Generator. If the output current is set to 0.0
mA, the diagnostic test is run with an output current of 1.0 mA, a pulse
width of 500
μ
sec, and a frequency of 20 Hz. If the output current is
programmed greater than 0.0 mA, the diagnostic test is run at the
programmed settings.
Caution:
LivaNova recommends interrogating the Pulse Generator
after any diagnostics in order to verify parameter settings.
Caution:
If an error message occurs and the Communication
parameter reads “FAULT”, return to the MAIN Menu and select
Interrogate Device
to verify that the Pulse Generator is programmed
to the correct parameters. The “FAULT” message also means the
diagnostic test was not completed and may need to be performed
again.
Caution:
A device status of STANDBY indicates that the Pulse
Generator was not stimulating and that the diagnostic test must be
repeated.
4.2.2.1.
Interrupted System and Generator Diagnostics
For Models 100, 101, and 102 Generators, device parameters may be
programmed to unintended settings if the communication between the
Programming Wand and the Pulse Generator is interrupted during System
or Generator Diagnostics. When the Diagnostics test is first interrupted,
the Programming Software displays a warning message indicating that the
procedure failed and device settings were potentially altered (see Figure 19
on page 32). The warning message also indicates some troubleshooting
options and allows the user to retry the testing. If the testing fails for the
second time due to an interruption in communication, the user will have
the option to retry again, or to cancel the operation (see Figure 20 on page
32). If the user chooses to cancel the operation, a warning message is
displayed indicating that device parameters were potentially
reprogrammed and an interrogation is recommended (see Figure 21 on
page 33). Upon selecting
Proceed
, the Programming Software displays the
PARAMETER screen where parameter values are shown as [*****] to
indicate that exact values are unknown due to the interruption in
communication (see Figure 22 on page 33). The user may then perform an
interrogation or program the Pulse Generator back to desired settings.
