(b)(4).The customer returned one peel-away sheath/dilator assembly for evaluation.A visual exam was performed and it was observed that the assembly was curved near the sheath tip, the sheath body was accordion along one score line, and the dilator tip was pushed back.The sheath body was accordion from 9mm to 14mm from the distal tip with a small tear in the score line within the damaged area.Microscopic examination confirmed the sheath and dilator damage.This type of appearance can occur when the sheath body is pushed back toward the proximal end during insertion.The damaged area had white areas indicating the material was stressed after manufacture.The sheath body measured 4.016" in length, which met specification.The dilator protruded through the catheter 1.456", which also met specification.The inner diameter (id) of the sheath tip and the outside diameter (od) of the dilator body were found to be within specification.A device history record review was performed on the sheath/dilator assembly with no relevant findings.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 nick was made prior to insertion.The report that the sheath/dilator assembly would not advance and bent during insertion was confirmed through examination of the returned sample.The sheath exhibited white stressed areas and rippled material that is pushed back toward the proximal end.The ripples indicate that the sheath met resistance during insertion and it pushed the material back.Based on the appearance of the sheath and the report that it bent during insertion, it was determined that operational context caused or contributed to this event.
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