(b)(4).The customer returned one hemodialysis catheter for evaluation.The catheter was separated into two parts and displayed signs of use.Visual examination of the catheter did not reveal any defects or anomalies.The returned catheter was tested by clamping the catheter body just below the juncture hub and pressurizing each of the extension lines with water using a lab inventory 10ml syringe.As each extension line was pressurized, the remaining extension line was observed for any water backflow.When the venous extension line was pressurized, backflow was observed from the arterial extension line.Therefore, the catheter did contain inter lumen crossover.A device history record review was performed and no relevant findings were identified.The reported complaint for a catheter inter lumen crossover was confirmed through functional testing of the returned complaint sample.When each extension line was pressurized with water, crossover was observed in the opposite extension line.Based on the testing performed, the probable cause is manufacturing related.A nonconformance request was initiated to further investigate this complaint issue.
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