Describing the MCS+ Cabinet Components 2-5
P/N 85213-30, Manual revision: B
Understanding the function of the pumps
The pumps function in a general manner during the different modes of MCS+
operation as follows:
When loading the disposable tubing:
! The AC pump and the Blood pump turn simultaneously to thread the dis-
posable tubing onto the pump rotors.
! The Transfer pump will be active during certain MCS+ protocols.
During PRIME
! The AC pump and the Blood pump turn simultaneously to provide the inlet
side of the donor-line tubing with AC solution.
! The Transfer pump will be active during certain MCS+ protocols.
During DRAW
! The AC pump will deliver AC solution from the AC solution bag to the nee-
dle connector.
! The Blood pump will pull anticoagulated whole blood past the blood filter
of the disposable set and into the centrifuge bowl.
! The Transfer pump will be active during certain protocols. The Transfer
pump speed will vary in relation to the Blood pump speed and the donor
flow rate.
During RETURN
! The Blood pump pulls the remaining blood components from the centri-
fuge bowl and re-infuses the contents to the donor.
! The Transfer pump will be used to mix solutions with the uncollected
blood components, prior to re-infusion to the donor.
! The AC pump will be inactive.
Note: The Blood pump and the AC pump will rotate at different speeds during
DRAW, depending on the AC/Blood pump ratio parameter setting. Information
related to the function of the pumps during sub states, such as SURGE and
DWELL, will be provided in each relevant MCS+ protocol manual.
Table 2-1, MCS+ pump function according to MCS+ operating mode
MCS+ mode AC pump Transfer pump Blood pump
PRIME Yes Protocol-specific Yes
DRAW Yes Protocol-specific Yes
RETURN No Protocol-specific Yes
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