(b)(4).Internal file number - (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 other incidents.The investigation was unable to determine a conclusive cause for the reported difficulty to deploy (wall apposition); however, the subsequent treatment appears to be related to the circumstances of the procedure.There is no indication of a product quality issue with respect to the design, manufacture or labeling of the device.The xience proa is currently not commercially available in the u.S; however, it is similar to a device sold in the us.The 2.75x33mm xience proa stent mentioned was filed under a separate medwatch report.
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