Vantive is issuing an urgent medical device correction to all Prismaflex control unit users due to the potential dislodgement of the Prismaflex Set deaeration chamber from the Prismaflex control unit, as shown in figure 3 below. This issue does not affect PrisMax control units and may occur only when the Prismaflex sets are being used with the Prismaflex control unit, as the two machines have different deaeration chamber holder designs.