Describing the PCS2 Device Components
2-13
P/N 85266-30, Manual revision: A
Pressure
monitors
The electronically controlled pressure monitors function with the correlating
filter on the disposable set to measure pressure in the disposable tubing. The
pressure monitors provide feedback to the system about the flow of blood
components. The PCS2 programming will automatically regulate the speed of the
pumps based on this information.
Donor pressure monitor (DPM)
The DPM, located on the left side of the PCS2 top deck, measures pressure in the
donor line tubing. The information is depicted on the display screen using a bar
graph. The bar graph is visible on the screen when donor pressure is adequate to
maintain the programmed pump speed. The bar graph will not be visible if donor-
line pressure is below what is required to maintain the programmed pump speed.
Variations will exist in the readings, depending on the operating mode. The PCS2
software is programmed to detect a range of normal values. If a pressure reading
varies outside of this range, the PCS2 safety system will stop the pumps and
provide an explanatory screen message, as well as an intermittent alarm.
Caution:
Once the DPM and the disposable set filter have been connected, the
system is ready to measure the pressure in the donor line. This connection should
not be disrupted at any point. In the event of a power failure, the operator should
refer to the chapter “Troubleshooting During a PCS2 Procedure” for details about
handling the DPM and the donor line tubing. The DPM tubing must be clamped
before removing the filter to ensure that the procedure can be recovered.
DRAW mode
The pressure readings will vary as blood is drawn from the donor. If a significant
pressure decrease is detected and the DPM readings drop below a programmed
value, the pump speed will automatically decrease until a sufficient pressure
increase is measured.
If the donor-line pressure is measured as insufficient, the pumps will stop, the NO
FLOW indicator lights will be visible and an explanatory screen message will
appear with an alarm. Once pressure is measured to be within normal operating
range, the pumps will resume the programmed speed.
RETURN mode
The pressure readings will vary as blood is returned to the donor. If a significant
pressure increase is detected, and the pressure readings rise above a programmed
value, the pump speed will automatically decrease until a sufficient pressure
change is measured. If pressure readings remain high, the Blood pump will stop,
and an explanatory screen message will appear with an alarm.
When pressure is measured to be within the normal operating range, the pumps
will resume operation until reaching the programmed pump speed.
