The device was not returned for analysis.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 similar incidents from this lot.As there was no damage noted to the device during the inspection prior to use, the investigation determined the reported difficulties appear to be related to circumstances of the procedure as it is likely that interaction with the mildly calcified and mildly torturous anatomy and/or other devices 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.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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