The device was returned for analysis.The reported physical resistance / sticking and the reported difficult or delayed activation were unable to be replicated in a testing environment due to the condition of the returned device (stent previously deployed).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 other incidents from this lot.It is possible that interaction with the mildly calcified and mildly torturous anatomy resulted in restricting the shaft lumens from moving freely, thus preventing the thumbwheel from rotating resulting in the reported physical resistance / sticking and the reported difficult or delayed activation; however this cannot be confirmed.The investigation determined a conclusive cause for the reported difficulties cannot be determined.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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