Boston Scientific Precision Manuel page 66

Precision™ Spinal Cord Stimulator System Clinician Manual
Multiple-Area Battery-Longevity Worksheet
Use this method when more than one area is used.
1. Calculate the TOTAL RATE of the stimulation frequencies by adding together the rate from
each area that is used:
TOTAL RATE = Rate 1____+ Rate 2____+ Rate 3____+ Rate 4 ____
TOTAL RATE = _____Hz
2. Calculate the Rate-Weighted Pulse Width (RWPW) for each area used by multiplying the
Pulse Width value for each area used by the Rate of that area and then dividing the result by
the TOTAL RATE that was calculated in step 1.
RWPW1 = PW1 x Rate 1/ TOTAL RATE = _______
RWPW2 = PW2 x Rate 2/ TOTAL RATE = _______
RWPW3 = PW3 x Rate 3/ TOTAL RATE = _______
RWPW4 = PW4 x Rate 4/ TOTAL RATE = _______
3. Calculate the Total-Weighted Pulse Width (TWPW) by adding together the Rate-Weighted
Pulse Widths calculated in step 2.
TWPW = RWPW1____+ RWPW2____+ RWPW3____+ RWPW4____
TWPW = _________ micro seconds
4. Determine the area with the largest amplitude
Largest amplitude = __________ mA
5. Look up the battery-longevity projection in the table using the Total Rate, TWPW, and largest
amplitude. (Interpolation may be used for improved accuracy.) The battery-longevity projec-
tion is given in years and represents the longevity of a typical rechargeable Stimulator battery
when used continuously. If the rechargeable Stimulator battery is not used continuously, the
battery-longevity should be greater than the value given.
Multiple-Area Battery Longevity Worksheet Example 1
In this example two stimulation areas are used with the following settings:
Area 1: Amplitude = 5.0 mA, Rate = 30 Hz, PW = 200 micro sec
Area 2: Amplitude = 8.0 mA, Rate = 60 Hz, PW = 400 micro sec
1. Calculate the TOTAL RATE (TR) of the stimulation frequencies by adding together the rate
from each area that is used:
TOTAL RATE = Rate 1 30 Hz + Rate 2 60 Hz
TOTAL RATE = 90 Hz
Clinician Manual
90607862-22 Rev A 66 of 303