(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 revealed no manufacturing nonconformities that would have contributed to this complaint.Additionally, a review of the complaint history identified no similar incidents from this lot.The investigation determined a conclusive cause for the reported difficult to deploy (wall apposition) cannot be determined.A conclusive cause for the reported patient effects, and the relationship to the product, if any, cannot be determined.The reported patient effect of thrombosis is listed in the xience xpedition, everolimus eluting coronary stent system (eecss), instructions for use (ifu) as a known patient effect of coronary stenting procedures.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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