10. Blood Pump
10. BLOOD PUMP CONTROL SYSTEM
10.1 OVERVIEW
The blood pump is a peristaltic pump that moves extracorporeal
blood at the prescribed flow rate during dialysis. During
extracorporeal alarms, the blood pump stops, occluding the pump
segment of the arterial blood tubing and preventing any more
blood from being drawn from the patient.
The blood pump control system includes the following
components:
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Single Board Computer (SBC)
Blood pumps, primary and (optional) secondary, including
motor, optical speed sensor, and rotor
Blood Pump Controller Board for software speed error control
Blood Pump Power Board for hardware speed error control and
motor power driver circuitry
Venous line clamp (VLC), including VLC optical sensor, and
I/O Controller and Power Boards.
The following are also involved with this system:
Extracorporeal arterial and venous blood pressure
measurement (see Section 12.1.1 and 12.1.2)
Drip chamber level adjust controls, including motors, valves
and switches (see Section 12.1.3)
Heparin delivery system (see Section 11, Heparin Delivery)
Internal cabinet temperature control (see Section 6.5).
All Arena Instruments include the primary pump. The secondary
pump is included only if the Single Needle or OLHDF Options are
included with the Instrument. Refer to Section 22, Single Needle,
and Section 24, Hemodiafiltration/On-Line HDF, for more
information on these options.
10.2 PRIMARY AND SECONDARY BLOOD PUMPS
The primary and optional secondary blood pumps are
mechanically and electrically identical. The Blood Pump (BP)
assembly consists of the following elements (see Figure 10-1),
most of which are internal to the Instrument:
157-1278-917 Rev A 10-3
April 2004
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