(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.A visual, functional and dimensional inspection was performed on the returned device.The reported shaft detachment was confirmed.The reported failure to advance could not be tested as it was based on operational circumstances.The reported difficult to position could not be tested due to the condition of the returned device.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 did not indicate a lot specific quality issue.The investigation determined the reported difficulties and subsequent treatment appear to be related to the operational context of the procedure, as it is likely the stent interacted with the heavily calcified anatomy during advancement, thus causing the reported failure to advance.Further interaction with the guide catheter/guideliner, as resistance was noted, likely contributed to the reported difficult to position.Further manipulation while retracting the device contributed to the noted stretched and torn inner member, ultimately causing the reported shaft separation.There is no indication of a product quality issue with respect to the design, manufacture or labeling of the device.The 3.5x26mm graftmaster covered stent referenced is being filed under a separate medwatch report.
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