(b)(4).Evaluation summary: visual, dimensional and functional inspection was performed on the returned device.The reported resistance was not confirmed using a proxy sheath.It may be possible that the inner diameter of the 6f introducer sheath was smaller than the labeled recommended minimum id and may have contributed to the reported resistance; however, without having the introducer sheath to examine, this could not be confirmed.Foreign material was found on the device and sent for chemical analysis.The foreign material was likely scrapped from the inner surface of the introducer sheath.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.Additionally, a review of the complaint history of the reported lot revealed no other similar incidents.The investigation was unable to determine a conclusive cause for the reported difficulties.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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