Evoke
®
SCS System Clinical Manual
CLIN-UMAN-005175
Revision: 9.00
Page 25 of 101
Figure 6.15: A) ECAP display for the selected measurement electrode configuration (orange)
and 3 other configurations (green, blue and red). Note the measurement settings, in order,
are: sampling delay, processing offset (number of samples), filter frequency, and number of
filter samples; B) Measurement electrode scan window showing measurement electrode
configurations, Signal Quality Indicator (SQI) and Settings button. Refer to Section 7.4 for
more information.
1.
Start stimulation and increase the stimulation current (see Section 6.9) so that a clear
ECAP signal is visible and/or above the patient’s perception threshold.
2.
Use the ECAP display and measurement electrode scan window (Figure 6.15) to
determine the measurement electrode configuration with the optimal ECAP based on
size, shape, and/or largest Signal Quality Indicator (SQI) value (see Section 6.16).
a.
Enabling ClearCAP (Virtual Ground) may improve ECAP measurement (see
Section 7.2 for more information).
3.
Change the
Electrode Selection Mode
to
(see Section 8.3) and touch the required
measurement electrode.
4.
Change the
Electrode Selection Mode
to
(see Section 8.3) and touch the required
reference electrode.
Note:
The measurement and reference electrodes may not be moved to be adjacent to
the stimulation or return electrodes.
5.
Touch the
ECAP Measurement and Closed-loop Settings
icon
to open the
measurement and feedback settings menu (Figure 6.14E). The icon will change to show
the
Electrode Display
icon
(Figure 6.14C).
Zoom out
(Y-scale)
Zoom in
(Y-scale)
Sampling
period
Average ECAP
estimates
Recommended
measurement settings
Measurement settings
in use
Correlation filter used
to measure (white)
A
)
B
)
Display mode
