Haemonetics MCS+, Operator And Maintenance Manual

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Disposables 3-5
P/N 39551-00, Rev. F
Note: The nature of centrifugal separation is such that the lines of definition
between blood components are not distinct. A minimal contamination of an un-
desired component with the desired component is to be expected. For example,
some platelets may be present in the plasma in a PLP procedure.
When the bowl is filled, plasma, the lightest component (and therefore closest to
the core) begins to overflow through the effluent path and outlet port (Figure 3-3).
Overflow continues until the desired component exits the bowl and is collected
into a collection bag.
The Latham
Bowl “Surge”
Process
The “Surge” process is used in platelet collection protocols. Each cycle of the
platelet protocols consists of a Draw and Return mode. Surge is part of the Draw
mode.
After most of the plasma has exited the bowl, the buffy coat reaches the appro-
priate position within the bowl and is “detected” by the Bowl Optics sensor. Fig-
ure 3-4 shows when the buffy coat is detected by the Bowl Optics. This initiates
the Surge phase of the protocols.
Surge is the elutriation (washing) of platelets away from the buffy coat. This is ac-
complished via high speed recirculation of plasma from the plasma bag back
through the bowl.
✍
Figure 3-3, Plasma Overflow
Plasma
Anticoagulated
Whole Blood