(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.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 similar incidents from this lot.The reported patient effect of dissection is listed in the xience xpedition everolimus eluting coronary stent systems instructions for use as a known patient effect of coronary stenting procedures.The investigation was unable to determine a conclusive cause for the reported difficulties and treatment.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 de novo, 85% stenosed, calcified lesion in the moderately tortuous proximal left anterior descending coronary artery.During deployment of a 3.0x18 mm xience xpedition stent, the stent opened unexpectedly in an uneven manner causing a minor dissection in the arterial wall.The stent was still deployed in the target lesion.Another, same size xience xpedition stent was deployed to cover the dissection successfully and was well apposed.There was no adverse patient sequela and there was no reported clinically significant delay in the procedure.No additional information was provided.
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