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Tablet Instructions
Electrode Impedance and Battery Voltage
Interrogation includes measuring electrode impedance and battery voltage, and these measurements
are reported on the N
impedance measurement detects insufficient charge for one or more electrodes.
Figure 9 Insufficient charge alert shown on the N
To measure these items again, place the wand within approximately 1 inch of the neurostimulator and
select the applicable M
get there). For impedance measurements, use the C
during measurement.
Note: The system cannot measure impedance during a detected episode or during therapy
delivery. To measure impedance, either wait for the episode or therapy to complete, or disable
detection and therapy.
Significance of Impedance
Impedance measurements are useful for verifying the integrity of a particular electrode. Each
impedance measurement delivers a single pulse of current between an electrode and the
neurostimulator canister (can) to measure the voltage that results as the current flows. Impedance
measurements are reported in Ohms (voltage divided by current).
Impedance measurements greater than 3500 Ohms or less than 250 Ohms are considered abnormal.
If impedance measurements are abnormally high, there may be insufficient charge to deliver therapy.
When this is the case, alerts may appear on the Neurostim Info screen as shown below in Figure 10.
Figure 10 Alerts when there is insufficient charge to deliver therapies
®
RNS
System Programming Manual
I
screen. The N
EUROSTIM
NFO
EUROSTIM
button on that screen (select N
EASURE
I
tile and screen show an alert if the
EUROSTIM
NFO
I
tile and screen
NFO
EUROSTIM
field to adjust the current delivered
URRENT
I
from the H
screen to
NFO
OME
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