Appendix - Boston Scientific Precision Manuel

Precision™ Spinal Cord Stimulator System Clinician Manual

Appendix

Rechargeable Stimulator Battery
Longevity
The rechargeable Stimulator battery should
provide at least five years of service. In
many cases, the Stimulator battery should
provide at least 25 years of service. Battery-
longevity is dependent on the stimulation
settings and conditions. The battery-longevity
projections provided in the table below
are based on continuous stimulation with
one area and one program. The longevity
estimates are generated using projections
of typical results based on Boston Scientific
internal testing data. Actual results may
vary. To determine battery-longevity with
multiple-area stimulation, please use the
Multiple-Area Longevity Worksheet provided
below. To determine battery-longevity with
multiple stimulation programs, please use
the Multiple-Program Longevity Worksheet
provided below. If stimulation is not used
continuously, the projected battery longevity
should exceed the value shown.
Clinician Manual
90607862-22 Rev A 64 of 303
Defining End of Battery Longevity
The expected battery longevity is defined as
the longer of either:
a) Typical case: the time from initiating
therapy to the time at which therapy
cannot be maintained with daily
charging
OR
b) High energy case: when the maximum
time between charging has decreased
by more than 50% from the initial maxi-
mum time between charging.
Effect of Impedance on Battery-Longevity
Projections
This chart assumes a maximum impedance
of 750 ohms between any 2 contacts in use.
For lower impedance values, the projected
battery longevity should slightly exceed the
value shown, for higher impedances, the
projected battery longevity should be slightly
less than the value shown. For example, the
following stimulation settings/conditions give
battery-longevity projections of 10.2 years:
Amplitude: 6 mA
Rate: 240 Hz
Pulse width: 400 micro seconds
Impedance: 750 ohms
If impedance is 500 ohms rather than
750 ohms, the battery-longevity projection
is extended to 11.3 years. Likewise if the
impedance is 1000 ohms, the battery-
longevity projection decreases to 9.7 years.
Thus, impedance has a small impact on
battery-longevity projections.