If the pump is capable of withdrawal, the plunger of the syringe is held by brackets on the
pusher block. When the stepper motor turns in the opposite direction, the pusher block moves
such that the syringe plunger is pulled, thus drawing fluid into the syringe.
For the Fusion Series syringe pumps, the pusher block moves to the right for infusion and to the
left for withdrawal.
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