Since no samples displaying the condition reported are available for examination, we were unable to fully investigate this occurrence.Bd was not able to duplicate or confirm the customer¿s indicated failure mode.Dhr could not be reviewed as the lot number is unknown.Quality records have been consulted for tracking and trending purposes and no issues like this are detected which means low occurrence.Product is functional tested and no incidents with air bubbles / air in line have been reported.Reviewing our pfmea's, there are proper controls in place to detect product malfunctions.We will keep monitoring the manufacturing process and in case any emerging trend is detected, further actions will be taken if necessary.Based on investigation results to date, root cause for manufacturing process cannot be determined.Based on an evaluation of severity and frequency it was determined that no corrective action is required at this time.
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