There was no patient injury.Because the legs were bent upward, the filter had to be removed.After removal of the filter, the legs straightened back out.The manufacturing dhr was reviewed and no non-conformances were noted.Proper materials and methods of manufacturing were utilized.The filter, pusher wire, delivery sheath, dilator, and a long strip of the ptfe interior lining of the sheath were returned.The sheath id was in specification and no concerns were observed with regard to the filter.However, it was noted that delamination occurred along the length of the sheath, beginning at the hub.Although a definitive root cause of the reported issue could not be determined, a potential cause could be that the pusher wire was not placed into the center of the lumen of the filter, which would prevent the filter from centering in the sheath.This may have allowed the filter hooks to engage the sheath wall, causing the delamination.The filter leg bending upward may have been caused by the leg being tangled in the pieces of the sheath lining, or the filter legs engaging the sheath tip (as a result of having engaged the sheath wall).
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