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Physician’s Manual — VNS Therapy Programming Software (8.1)
Table 6.
Device Diagnostic Screen Status Readings for
Output Current for Models 100, 101, and 102
9.
Lead Impedance:
On the Models 100, 101, and 102 Pulse Generators,
this parameter is used in conjunction with the DC-to-DC Converter to
assess how hard the device has to work to deliver a selected output
current, or how much the flow of current is impeded. For the Models
103, 104, and 105 Pulse Generators this parameter is used to assess
whether the impedance is within acceptable range. Table 7 shows the
possible values and interpretation for this parameter.
Table 7.
Device Diagnostic Screen Status Readings for
Lead Impedance
10.
DC-to-DC Converter:
On the Models 100, 101, and 102 Pulse
Generators, this parameter is used in conjunction with Lead
Output Current
Status Reading
Significance
OUTPUT CURRENT Setting
Shows the current at which the diagnostic
test was run. For System Diagnostics and
Generator Diagnostics (Pulse Generator
Test), the software automatically programs
the Pulse Generator to 1.0 mA. After the
System diagnostics, the Pulse Generator
will be reprogrammed to the pretest output
current setting. After the Generator
Diagnostics (Pulse Generator Test), the
Pulse Generator will be programmed to
standard settings (0mA/30Hz/500
μ
s/30s/
5min/0mA/60s/500
μ
s).
*****
The Pulse Generator is in STANDBY MODE
and is not delivering stimulation.
Lead Impedance
Status Reading
Significance
OK
Impedance is within acceptable operating
range.
HIGH
Impedance is higher than expected.
Indicates a possible discontinuity of the
Lead, or fibrosis between the nerve and
Lead.
UNKNOWN
Impedance cannot be assessed. Reprogram
the Pulse Generator for parameters in the
ranges noted in Table 10.
LOW
Impedance is lower than expected. Indicates
a possible circuit condition with the lead or a
defective Pulse Generator
