Boston Scientific Precision SC-1110 Mode D'emploi page 92

Precision™ Spinal Cord Stimulator System Clinician Manual
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 previously calculated.
RWPW1 = PW1 x Rate 1/ TOTAL RATE = (30 x 200)/90 = 66.67
RWPW2 = PW2 x Rate 2/ TOTAL RATE = (60 x 400)/90 = 266.667
3. Calculate the Total-Weighted Pulse Width (TWPW) by adding the rate weighted pulse
widths.
TWPW = RWPW1 66.67 + RWPW2 266.667
TWPW = 333.33 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-
longevity projection.
The closest values on the table using 90 Hz, 333.33 micro seconds, and 8.0 mA is found in the
box associated with 90 Hz, 330 micro seconds, and 8.0 mA. The result is a battery-longevity
projection of more than 25 years.
Multiple-Area Battery Longevity Worksheet Example 2
In this example, three stimulation areas are used with the following settings:
Area 1: Amplitude = 6 mA, Rate = 120 Hz, PW = 200 micro sec
Area 2: Amplitude = 4 mA, Rate = 120 Hz, PW = 400 micro sec
Area 3: Amplitude = 8 mA, Rate = 100 Hz, PW = 300 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 1 120 Hz + Rate 2 120 Hz + Rate 3 100 Hz
TOTAL RATE = 340 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 previously calculated.
RWPW1 = PW1 x Rate 1/ TOTAL RATE = (120 x 200)/340 = 70.58
RWPW2 = PW2 x Rate 2/ TOTAL RATE = (120 x 400)/340 = 141.17
RWPW3 = PW3 x Rate 3/ TOTAL RATE = (100 x 300)/340 = 88.23
Clinician Manual
91173656-02 84 of 385