Haemonetics MCS+, Operator And Maintenance Manual

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2-18 System Description
P/N 39551-00, Rev. F
In the presence of insufficient flow from the donor/patient, measured as a nega-
tive pressure of -80 mmHg, the DPM stops the pumps, the donor/patient NO
FLOW indicator illuminates, and an audible signal alerts the operator to initiate
corrective action. The White Pump continues to pump plasma through the bowl
to maintain optimal separation during platelet collection.
Warning! Once the DPM is inserted into its port on the MCS+
device it should not be removed, as this component plays an es-
sential role in the monitoring of pressure. If the MCS+ device is
switched off or if there is a power failure, do not remove the
DPM until the line is clamped. Then, remove the DPM until
power has been restored. Once power has been restored, re-
connect the DPM and unclamp the line. (The display will tell
you when to clamp and disconnect the DPM and when to re-
connect and unclamp it.) Any deviation from this procedure
may invalidate the ability of the MCS+ device to properly mon-
itor pressure. (Refer to the Recovery Procedure in Chapter 5.)
Return Mode
During Return, the DPM monitors the pressure within the donor/patient line. The
bar graph on the display screen indicates a range of pressure from 0 at the bottom
to 260 mmHg at the top. If pressure greater than a protocol-determined limit is
detected, the Blood Pump slows until there is sufficient change in pressure. At
this time, the pump gradually increases speed to the programmed rate. If a pres-
sure in excess of 260 mmHg is detected, the Blood Pump is stopped, a signal
sounds, and the message “HIGH RETURN PRESSURE” is displayed.
Any time a high return pressure message is displayed, all control keys are dis-
abled except for the red STOP key. If the Blood Pump alternately stops and re-
starts and the message high return pressure is displayed, check for and correct
any flow obstruction, then lower the Blood Pump speed in order to establish an
uninterrupted return flow to the donor/patient.
Warning! A pressure in excess of 260 mmHg indicates a flow
obstruction that could cause red blood cell hemolysis or dam-
age to the vein. The following corrective action must be taken:
press the PUMP START/STOP key, check for and correct any
flow obstruction, relieve the high pressure, and continue the
procedure.