The customer¿s report that the tubing developed a balloon in silicone segment was confirmed by visual inspection of the as-received sample.The set was visually inspected for kinks, incomplete bonding engagements, holes/ tears in the tubing or damages to the components.Clear liquid was observed inside both the set¿s tubing and the drip chamber.No other anomalies were observed on the set during visual inspection.Since the observation of the balloon in the silicone tubing segment has already been observed in a high number of previously investigated complaints, functional testing was not conducted.The probable cause identified from previous extensive failure investigations have found that bubble/ balloon can occur when an iv push medication or flush is executed below the pump without first clamping the tubing injection port.This action was found to result in excessive pressure within the silicone segment thus causing the silicone segment to bubble/ balloon.Clinical advice for an iv push medication or flush is to be executed below the pump and clamping the tubing above the injection port.The root cause for the source of the excessive pressure is unknown.
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