The device was not returned for analysis.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 identified no other similar incidents from this lot.The investigation determined the reported difficulties appear to be related to circumstances of the procedure as it is likely that resistance was met with the heavily tortuous and heavily calcified anatomy resulting in the reported failure to advance.Manipulation of the device resulted in the reported deformation due to compressive stress/kink.During removal, interaction with the heavily tortuous and heavily calcified anatomy resulted in the reported stent dislodgement.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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It was reported that the procedure was to treat a long lesion located in the heavily tortuous left anterior descending coronary artery that was heavily calcified.The 2.5 x 33mm xience sierra stent was implanted without issue.Next the 2.75 x 33mm xience sierra stent delivery system (sds) was advanced but failed to cross into the lesion.It was noted that the distal end of the stent delivery system was kinked.During removal of the sds, the distal part of the stent appeared to be kinked and moved on the delivery system balloon, but the proximal stent appeared secure on the balloon.All devices were removed as a single unit.There was no adverse patient effect or a clinically significant delay in procedure.No additional information was provided.
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