(b)(4).
During processing of this complaint, attempts were made to obtain complete event, patient and device information.
The device was not returned for analysis.
A review of the lot history record revealed no manufacturing nonconformities that would have contributed to this complaint.
Additionally, a review of the complaint history identified no other similar incidents from this lot.
The investigation was unable to determine a conclusive cause for the reported difficulties.
There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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