Boston Scientific SC-5210 Manuel page 51

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 projection is given in years and represents the longevity of a typical
rechargeable implant battery when used continuously. If the rechargeable implant 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
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
Appendix
Patient System Handbook
9055960-003 REV B 49 of 233