12. Pressure Monitoring
both are ignored. If a button is held longer than approximately 5
seconds, it times out.
The motor drive circuitry is located on the Blood Pump Power
board. The motor may be driven in the forward or reverse
direction. A direction signal from the Blood Pump Controller
board, along with a pulse width modulated motor rate signal,
controls two bipolar half-bridge motor drivers. Both half-bridge
motor drivers receive the same motor rate signal, while the motor
direction signal is high at one and low at the other to determine the
direction the motor runs. The half bridge drivers provide a 24 V
pulse width modulated drive voltage of approximately 30 kHz to
the motor.
WARNING
Handle used blood lines, dialyzers, transducer
protectors, and blood contaminated components as
potentially biohazardous waste. Refer to the clinic’s
procedures for the disposition of these items.
Connected to the venous and arterial monitors is a small motor-
operated peristaltic pump (SND option is not shown in Figures 12-
4 and 12-5). This pump is used to raise or lower the level of blood
in the extracorporeal blood line drip chambers.
Figure 12-6. Pressure Monitoring and Level Adjust Block Diagram
157-1278-919 Rev A 12-9
April 2004
To Next Page
Loading...
