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(b)(4).A review of the complaint history, device history record, instructions for use (ifu), quality control, and visual inspection of the returned device was conducted during the investigation.The sheath and dilator of the performer introducer set were returned for investigation and examined.Biomatter was present on the sheath and the dilator.The sheath distal tip showed a wrinkled tip with hangnail damage.A 1mm wrinkle is noted at the distal tip of the sheath.Slight wavy bends were noted on the shaft of the dilator.A slight bend was noted in the dilator at 5.0 cm from the proximal end.There is no evidence to suggest the finished product was not made to specifications.Review of the device history record of the finished product shows no nonconforming events that would contribute to this failure mode.There were no other reported complaints for this lot number.Instructions for use state, "precautions: this product is intended for use by physicians trained and experienced in diagnostic and interventional techniques.Standard techniques for placement of vascular access sheaths should be employed.Do not attempt to insert or withdraw the wire guide and/or introducer if resistance is felt." it is possible that user technique may have contributed to the failure mode of the device.The type of damage observed on the returned complaint device is consistent with an angled insertion disrupting the transition between the sheath and dilator during advancement.However, based on the information provided and the results of our investigation, a definitive root cause could not be determined.Per the quality engineering risk assessment, no further action is warranted.Monitoring will continue to be performed for similar complaints.
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