BIOTRONIK Lumax DR ICD Series, Technical Manual, Page: 153 / 176

24 Lumax Technical Manual
5.2 Longevity
The service time of an ICD/CRT-D can vary based on several
factors, including the number of charge sequences, programmed
parameters, number of tachyarrhythmias detected, relative
amount of bradycardia pacing required, pacing lead impedance,
storage time, battery properties, and circuit operating
characteristics. Service time is the time from beginning of service
(BOS) to the elective replacement indication (ERI). To assist the
physician in determining the optimum time for ICD/CRT-D
replacement, a replacement indicator is provided that notifies the
user that replacement within a certain period of time is required.
Upon reaching ERI, the battery has at least enough energy left to
continue monitoring for three months along with the ability to
deliver six high-energy shocks. After this period, all
tachyarrhythmia detection and tachyarrhythmia therapy is
disabled.
C
AUTION
Charge Time - When preparing a high energy shock the
charge circuit stops charging the capacitors after 20 seconds,
and delivers the stored energy as shock therapy. After the
device reaches ERI the stored energy may be less than the
maximum programmable energy for each shock.
The service times from beginning of service (BOS) to elective
replacement indication (ERI) are listed in the following tables. All
estimates assume pacing rate of 60 ppm with a pulse width of
0.5 ms and pulse amplitude of 2.8 volts and 500 ohm pacing
impedance with all shocks at maximum programmable energy at
37C. It is assumed that the shocks are equally spaced
throughout the life of the ICD/CRT-D. The estimates associated
with 0% pacing support assume the ICD/CRT-D is sensing an
intrinsic sinus rhythm at a rate of 70 bpm. The tables represent
the mean longevity estimates for the specified devices (by order
number) dependant upon which of the available batteries for each
device.