Evoke
®
SCS System Clinical Manual
CLIN-UMAN-005175
Revision: 9.00
Page 49 of 101
Original ratios, stimulation set C selected
Stimulation set C ratio lowered
Figure 7.10: (Left) A program with 4 stimulation sets in Ungrouped mode with stimulation set
C selected. (Right) The ratio for stimulation set C has been reduced while the others remain
the same.
7.6
Activation plot levels
During programming you may wish to mark activation plot levels. The levels will be indicated by
horizontal lines on the intensity bar graphs (Figure 7.11B), and horizontal (ECAP amplitude) and
vertical (current) lines on the activation plot (Figure 7.11A).
1.
Mark the activation plot levels by touching the following buttons (see Figure 7.11A)
a.
Threshold
(
T
): ECAP threshold or when the patient first feels a change in
sensation (e.g. paresthesia or pain relief).
b.
Comfort
(
C
- and
C+
): When the patient reports a preferred comfortable
sensation, for increasing or decreasing stimulation, respectively.
c.
Maximum
(
M
): When the patient could tolerate stimulation for no more than
approximately one minute.
Note:
When marked, the button becomes a darker orange.
2.
The therapeutic window is defined by the difference between the ECAP amplitudes at
Threshold (T) and Maximum (M). Only enable closed-loop if the therapeutic window is >
10 µV (see Section 6.11).
3.
To change the levels, touch the button once to clear the mark, then touch again to set
the mark to the new level.
Note:
The threshold level must be less than all other levels and the maximum level must
be greater than all other levels. If an activation plot level is selected that causes a
previously selected level to fall outside these criteria, then the previously selected mark
will be cleared (e.g. If
C+
is selected at a level less than
T
, then the mark for
T
will be
cleared).
Note:
The levels will be cleared if settings are changed that could affect the activation
plot levels (e.g. if pulse width is changed, stimulation current and ECAP amplitude levels
