The customer¿s report that there was a bubble in the pump segment was confirmed during visual inspection.The set was visually inspected for kinks, incomplete bonding engagements, holes/tears in the tubing or damages to the components.Clear liquid was observed within the tubing throughout the set.At the top of the silicone pump segment tubing near the upper fitment, a balloon was observed.Functional testing of previous complaints with the failure mode of ¿balloon/bulge in silicone tubing segment¿ was performed by placing the infusion set in an alaris pump module and closing the door, programming/running the infusion, pausing the infusion, and then injecting an iv push fluid bolus through a distal y-site of the infusion set.Testing included injecting an iv push bolus after clamping the tubing (below the pump segment but above the iv push site per the dfu) and injecting the iv push bolus without clamping the tubing.Ballooning was not replicated in any clamped testing but has been replicated in unclamped testing when the tubing had been visually observed to be compromised (from previous ballooning).The root cause for the source of the excessive pressure is unknown.
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