(b)(4).
Evaluation summary: the device was returned for evaluation.
The reported difficulties were not confirmed.
Based on visual, dimensional and functional analysis of the returned device, there is no indication of a product quality issue with respect to manufacture, design or labeling.
The investigation was unable to determine a conclusive cause for the reported difficulties.
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 similar incidents from this lot.
Based on the information reviewed, there is no indication of a product quality issue with respect to manufacture, design or labeling.
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