(b)(4).Device evaluation: the report that the sheath began to peel back and kink was confirmed.One peel-away sheath dilator assembly was returned.Microscopic examination found that one side of the sheath was split / deformed between 8 and 25 mm from catheter tip.In addition there was one accordion fold in the sheath located 42 mm from the tip.The sheath body measured 3.94" in length which met specification of 3.937 - 4.063" per the sheath graphic.The dilator protruded through the sheath 1.61", which meets the specification of 1.312 - 1.688" per the dilator sheath assembly graphic.The inner diameter (id) of the sheath tip measured 0.0585" using pin gauges, which met specification of 0.0585 - 0.0595" per the sheath graphic r-05041-008b, rev.3.The outside diameter of the dilator body measured 0.0590" using ring gauges, which met specification of 0.0565 - 0.0595" per the dilator graphic.This type of damage can occur when the sheath body is pushed back toward the proximal end.All the damaged areas had white areas indicating the material was stressed after manufacture.The instruction booklet provides insertion techniques for the sheath / dilator assembly.The ifu directs the user to enlarge the puncture site if necessary.It was not reported if a skin other remarks: nick was made prior to insertion.A device history record review was performed and did not reveal any manufacturing related issues.Based on the appearance of the sheath and the report that it became damaged during insertion, operational context caused or contributed to this event.No further action will be taken.
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