Module Description - Fresenius Medical Care 2008k Technical Manual

Section V – Module Description
ARTERIAL BLOOD PUMP MODULE
The blood pump draws blood from the patient and pumps it to the dialyzer and back to the patient in
a closed circuit. As the pump rotor rotates, twin rollers squeeze the pump segment, pulling and
pushing the blood through the blood pump segment. The spring force of the twin rollers is designed
in such a way, that the delivery pressure with the prescribed blood line system is limited to 2 bar (30
psi), which rules out ruptures of the blood lines from kinking or clogging. In the cold state, i.e. in
the preparation phase, the delivery pressure is even less and because of the bloodline tolerances, the
pump may not self prime with air. The blood pump segment is held in place by a spring-loaded
device located below the pump rotor. The pump rotor is removable for cleaning.
For reasons of personnel safety, the blood pump will run only when the door is closed. The speed of
the pump can be adjusted using the arrow keys on the blood pump. The blood pump can be stopped
by pressing the Start/Stop key or by opening the blood pump door. When the door is open, the
diameter of the pump segment is shown in the display window.
The arterial pressure monitor port is located above the pump housing. Utilizing the arterial pressure
port and a small air pump the arterial chamber level can be raised. By pressing the Level Adjust
key, the air pump runs and removes air from the arterial chamber allowing the level to rise. Due to
the risk of introducing air into the closed blood circuit, the air pump only removes air to raise the
chamber level and cannot be used to lower it.
If it should become necessary, because of power failure or line problem, the pump can be operated
manually (in clockwise direction) with a separate hand crank attached to the rear panel of the
machine.
The module is attached to the machine cabinet with two screws. The electrical connection to the
card cage can be removed once the rear panel has been removed.
Note: Refer to Chapter 6 - Alarms and Troubleshooting section of the 2008K Operator's Manual
(P/N 490042) for a complete list of alarm codes (A.xx) and error codes (E.xx).
2008K Technician's Manual V-1