Gambro AK 95 S, Service Manual

Page: 39 / 247

Technical Description
AK 95 / AK 95 S Service Manual
HCEN 9134 Rev. 10.2005
2:18
Treatment
Arterial blood is taken in via the arterial line
clamp . During treatment the line clamp is open.
The arterial pressure guard is used to give an
alarm if the pressure becomes too low. For
example, if the needle or the arterial blood line
is blocked, an alarm will be given ( the blood
pump is stopped). The alarm is activated if there
is an increased negative pressure between the
patient and the blood pump,e.g:
• A drop in blood pressure.
• Altered positions of the arterial needle.
• A kink in the arterial line between the
patient and the blood pump.
The function of the blood pump is to maintain
the extra corporeal blood flow. Blood is removed
from the patient, forwarded to the dialyzer and
then returned to the patient.
The blood pump can not be run when the pump
cover is open.
If necessary, the blood can be returned to the
patient manually.
The purpose of the heparin pump is to add
heparin to the blood.
An alarm is issued when the syringe is empty or
if the heparin line is kinked.
The heparin parameters can be adjusted by
pressing the
heparin button.
The venous pressure transducer measures
the venous bloodpressure. The lamp in the
Venous pressure button is lit and the buzzer
sounds if the alarms are activated and the
venous bloodpressure is outside the alarm
limits. If the event of an alarm, the blood flow is
stopped.
If the venous pressure is too high, the cause may
be:
• An obstruction after the venous drip
chamber.
• A change in the patients position.
If the venous pressure is too low, the cause may
be:
• A line separation.
• A drop in blood pressure.
• A change in the patients position.
The air detector has the following function:
If the blood level in the venous drip chamber
is too low, an alarm is given and the blood flow is
stopped (the blood pump and heparin pump are
stopped and the venous line clamp is closed). The
venous drip chamber acts as an expansion cham-
ber to even out pressure pulsations.
When the air detection alarm is generated, the
lamp in the Air detect button is lit and the
buzzer sounds. The lamp begins flashing when
the air detector does not detect air any longer.
The operator must reset the air detection alarm
by pressing the
Air detect button. After press-
ing the Air detect button for 3 seconds, the air
detector alarm is bypassed for x seconds (preset-
table 0-120 sec.). Default it is disabled (0 sec-
onds) and no override is possible.
The priming detector detects if there is blood
in the venous blood line. If no blood is detected,
it is not possible to start the treatment.
The blood is transported back to the patient via
the
venous line clamp . The clamp is normally
open. But in the event of an alarm from the air
detector or the venous pressure transducer, the
line clamp clamps the blood line and stops the
blood flow (not during high pressure alarm).