Boston Scientific Precision Manuel page 68

Precision™ Spinal Cord Stimulator System Clinician Manual
3. Calculate the Weighted Total-Weighted Pulse Width (TWPW) by adding the rate weighted
pulse widths.
TWPW = RWPW1 70.58 + RWPW2 141.17 + RWPW3 88.23
TWPW = 299.98 micro seconds
4. Determine the area with the largest amplitude
Largest amplitude = 8.0 mA
5. Use TOTAL RATE, TWPW, and largest amplitude in the chart to determine the battery-lon-
gevity projection.
The closest values on the table using 340 Hz, 299.98 micro seconds, and 8.0 mA is found
in the box associated with 340 Hz, 300 micro seconds, and 8.0 mA. The result is a battery-
longevity projection of 8.0 years.
Multiple-Program Longevity Worksheet
Quick Method:
If multiple programs are routinely used, determine the battery-longevity projection for each
program using the methods mentioned above (including the 'Multiple-Area Battery-Longevity
Worksheet' if needed). The battery-longevity projections for multiple programs should be
between the longest and shortest projections.
Detailed Method:
For a more specific estimate, one can calculate the time-weighted-average battery-longevity
projection as follows:
1. Determine the battery-longevity projection for each program and estimate the number of
hours per day of use for each program.
2. For each program multiply the expected battery longevity by the number of hours of use per
day and then divide the result by 24.
Battery longevity program 1____ x ____ hours per day / 24 = _____
Battery longevity program 2____ x ____ hours per day / 24 = _____
Battery longevity program 3____ x ____ hours per day / 24 = _____
Battery longevity program 4____ x ____ hours per day / 24 = _____
3. Total the results:
This total is the battery-longevity projection for the multiple programs.
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= _____