84 AK 98™ Dialysis Machine - Technical description
HCEN12630 Revision 07.2015
Program version 1.xx
If the accumulated volume of the protective subsystem exceeds its alarm limit an alarm
is generated and further volume removal is prevented.
The UF supervision volume deviation alarm limits are widened with time in treatment
when combined control system and protective system flow sensors accuracy limit
exceed a preset limit (mL).
The UF supervision volume deviation alarm limits are whichever is largest of:
1. UF supervision volume limit start value.
2. (UF supervision volume limit widening rate) * (passed treatment time).
3. (UF supervision volume limit widening rate * passed treatment time) + (2.5 % of
UF rate part above 2 L/h) * (passed treatment time with UF rate above 2 L).
NOTE!
The UF volume limit start value and the UF supervision volume limit widening rate
can be preset by a service technician.
The UF volume limit start value can be preset in range between 200-400 ml. (default
300 mL).
The UF supervision volume limit widening rate can be preset in range between 100
-135 mL/h (default 135 mL/h).
The alarm can be acknowledged by the operator for one time (which results in a
widening of the acceptance criteria with the preset value UF supervision volume limit
start value (see above).
The measured accumulated UF volume is not reset. If this extended acceptance
criteria is not met, then the operator is not able to acknowledge this alarm, but
requested to terminate the treatment.
In case of a detected alarm situation, the safe state reactions of the protective system
are as follows:
● Protective system stops fluid from reaching dialyzer (DIVA close, BYVA open,
TAVA close, EVVA close)
● Protective system activates audible and visual alarm.
3.3.3.6.10 UF protective taration
The UF protective measurement performs a taration in parallel with the UF control
measurement, and cannot affect its duration.
The taration works as follows:
The self-calibration has two phases:
1. Prepare Taration phase
2. Differential Flow phase
Prepare taration and differential flow
Due to the location of the UF measurment cells for the UF protective measurement
there is no zero flow phase, instead the differential flow phase is prolonged.
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