(b)(4).Investigation - evaluation a review of the specifications, manufacturing instructions and quality control was conducted during the investigation.The complaint device was not returned therefore, no physical examinations could be performed; however, a document based investigation evaluation was performed.The lot number of the device is not known; accordingly a review of the device history record could not be conducted.Based on the information provided and results of the investigation, a definitive root cause could not be determined.Per the quality engineering risk assessment no further action is required.Monitoring for similar complaints will continue.
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