Investigation - evaluation: a review of the complaint history, device history record, documentation, instructions for use (ifu), manufacturing instructions, specifications, quality control, and visual inspection of the returned device was conducted during the investigation.One unused, opened gunther tulip vena cava filter retrieval set was returned for evaluation.The hub was separated from the introducer sheath.The sheath flaring was measured to be within specification limits.A similar test fitting was attached to the complaint sheath and even by strongly pulling the fitting, did not slip the sheath.A document-based investigation was performed.There is no evidence to suggest the finished product was not made to specifications.Numerous design verification and validation activities have been performed to ensure that this device meets design requirements.Review of the device history record of the finished product shows no nonconforming events that could contribute to this failure mode.A complaint history search revealed that there were no other reported complaints for this lot number.Per the ifu, "excessive force should not be used to retrieve the filter." based on the information provided, examination of the returned product, and the results of our investigation, the root cause for this event was determined to be related to product use/ handling as the device was likely exposed to strong pulling/manipulation.Per the risk assessment, no further action is required.Monitoring will continue to be performed for similar complaints.
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