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OTHER FUNCTIONS OF AK 98
What is the automatic restart?
The automatic restart is a recovery process of the AK 98 program that usually completes in less than 1 minute.
During this process, the screen turns off for ~10 seconds, the blood pump is stopped, and the AK 98 machine is in a
patient-safe state.
Automatic Restart
Why may the automatic restart happen?
The AK 98 program includes an internal safety process, called a “Heartbeat”, to check that there is healthy
communication between the different electronic sub-systems inside the machine; whenever a malfunction is
suspected, the AK 98 system triggers an automatic restart.
Note:
The term “Heartbeat” refers exclusively to a technical process intended to check correct functioning of
internal electronics and is NOT related to any heart-related clinical parameter of the patient.
How to manage the automatic restart during treatment?
1.
Wait for the process to complete – do NOT press the Halt button on the back of the machine.
2.
After the automatic restart is complete, press the Confirm button and check treatment parameters. The blood
pump will restart automatically, and the AK 98 machine will continue the treatment from where it was interrupted.
3. I
f the alarm “124 Technical error” is displayed, discontinue the treatment, and return the blood.
After the automatic restart is completed, a notification is provided:
• If the restart happens during functional check, priming, or treatment:
- The alarm “123 Technical error - The machine has been automatically
restarted” is displayed, with red light and alarm sound
• If the restart happens during disinfection:
- The attention “586 Restarted after power failure” is displayed, with
yellow light
Note: The automatic restart is logged in the error list as
“HEARTBEAT ERROR - MACHINE RESTARTED”.
• The automatic restart may happen rarely and randomly, and it is
important to report to clinical staff.
• If the automatic restart occurs more than 3 times within a 30-day
period, the AK 98 machine will not allow treatment and the alarm
“124 Technical error” will be displayed, with red light and alarm sound.
Ultrafiltration (UF) Rate Limits
If the UF rate goes down to zero during treatment, due to alarm conditions,
the machine will try to compensate for the time loss within the remaining
time. A high UF rate limit is automatically calculated and set as 120% of
the calculated UF rate. This limit is the allowable UF rate during treatment
with the given remaining UF goal and treatment time.
The UF rate will go down to zero when:
- the UF is manually stopped
- the self-check is done every 30 minutes (UF taration)
- the blood pump is stopped
- the dialysate is in bypass
- the UF goal is achieved
Note:
All actual values displayed are for a given moment in time and may
therefore fluctuate.
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