No sample has been returned for evaluation; therefore, the condition of the product could not be verified.No lot number was identified with this complaint; therefore, lot history and device history record reviews could not be conducted.As no sample was returned for evaluation; the condition of the product could not be verified.The event was reviewed and we could not ascertain the source of the failure mode from the available information.The root cause of the customer's complaint could not be established as a sample has not been received and the condition of the product could not be verified.Without analysis of the sample, it is not possible to isolate the root cause.As the root cause is unknown, the relationship, if any, of the device to the reported incident cannot be determined.The root cause for this complaint is not known, therefore, specific action with regards to this complaint cannot be taken.Quality assurance has reviewed this complaint and will continue to monitor data for evidence of adverse trending and take further action, as appropriate.The manufacturer internal reference number is: (b)(4).
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