Product Info

End of Programmed Service
WaveWriter Alpha™ & WaveWriter Alpha™ Prime Systems Information for Prescribers
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IPG Battery Life
Rechargeable Systems
The rechargeable battery in the WaveWriter Alpha System IPG should provide at least ve years
of service.
1
Battery life is dependent on your stimulation settings and conditions. In most cases, the
Stimulator will need to be recharged at intervals ranging from once a week to once a month. Over time, the
IPG battery will need more frequent recharges. Like all rechargeable batteries, use over time and repeated
recharge cycles reduce the maximum charge capacity of the IPG battery.
The WaveWriter Alpha System’s programming software gives you an estimate of charging time based
on 24 hours per day of stimulation at the programmed settings. Depending on the program parameters,
the patient may expect daily recharging times from as low as 10 minutes up to four hours, or weekly
recharging times from as low as one hour up to four hours. Battery life is dependent on your stimulation
settings and conditions
Non-Rechargeable Systems
The WaveWriter Alpha Prime IPG has a non-rechargeable battery. The longevity of the non-rechargeable
IPG battery depends on the following factors:
• Programmed parameters (i.e., amplitude, rate, pulse width, number of electrodes used, and number
of stimulation areas)
• System impedance
• Use of cycling or burst settings
• Hours per day of stimulation
• Changes made by the patient to programmed parameters
It is possible to estimate the battery longevity of a new IPG based on usage over 12 or 24 hours per day
with a selected Program. The estimate is based on the settings of a program, the system impedance at
time of estimation, and the hours per day of stimulation.
These estimates will not reect adjustments to stimulation parameters or changes in impedance. The
estimate functions as a reference value to approximate the period that a new WaveWriter Alpha Prime
stimulator will last (see Estimating Longevity section). Battery life is dependent on your stimulation settings
and conditions.
Note: If the WaveWriter Alpha Prime System is being considered for permanent
implant, it is recommended that the battery longevity of the WaveWriter Alpha
Prime IPG be estimated during the trial. It is also recommended to estimate
the battery longevity at the initial programming of the implant.
Note: Estimations made after initial programming of the IPG may overestimate the longevity of its battery.
When the IPG battery is fully depleted, the End of Service (EOS) indicator will be displayed on the Remote
Control and Clinician Programmer. Stimulation will not be available. Surgery is required to replace the
implanted non-rechargeable stimulator to continue providing stimulation.
Estimating Longevity (for Non-Rechargeable Systems)
After the optimal settings have been identied for a program, click on Battery Estimate in the Program
Options Menu in the Bionic Navigator™ 3D software to obtain the Energy Use Index. Use Figure 1 (if
estimated usage of stimulation is 12 hours) or Figure 2 (if estimated usage of stimulation is 24 hours) to
1 The expected years of battery operation are dened as the longer of either:
A.Typical case: the time at which therapy cannot be maintained with daily charging.
OR
B.High energy case: when the maximum recharge interval has decreased by more than 50 % from the initial recharge
interval.