(b)(4).The stent remains in the vessel.It is indicated that the stent delivery system is not returning for evaluation; therefore, a failure analysis of the complaint device could not be completed.The investigation was unable to determine a conclusive cause for the reported difficulties.A review of the lot history record and complaint history of the reported lot could not be conducted because the part and lot numbers were not provided.Based on the information reviewed, there is no indication of a product quality issue with respect to the design, manufacture or labeling of the device.The potential other events referenced are filed under a separate medwatch report number.
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