(b)(4).The actual device was returned to the manufacturing facility for evaluation.Visual inspection upon receipt did not find any anomaly, such as a break, in its appearance conditions.Magnifying inspection of the bonded joint on the sampling line tube to the port found that the tube had a curved shape with a slight separation of the bonding between the tube and the port.The port was confirmed to have the trace indicating that the tube had been once bonded to it.The actual sample was filled with saline solution and pressurized at 2.0 kgf/cm2.No leak occurred from the joint in question.The sampling line tube was cut vertically and the inside and outside diameters and the wall thickness were measured.They were confirmed to meet manufacturing specifications, being comparable to those of the current product sample.Magnifying inspection of the sampling line tube from current product found that it had a curved shape similar to that on the actual sample.A review of the manufacturing record of the involved lot#/product code combination confirmed that there was no indication of production-related problem.A search of the complaint file did not find any other report with the involved product code/lot# combination.There is no evidence that this event was related to a device defect or malfunction.Although the exact cause cannot be determined, the actual sample inspection demonstrated that it did not have any leak from any joints, including the joint in question.All available information has been placed on file in quality management for appropriate tracking, trending and follow up.(b)(4).
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