A review of the following was completed: complaint history, device history record, documentation, drawing, manufacturing instructions, quality control, and specifications.The complaint device was not returned; therefore no physical examination could be 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, no product returned, and the results of our investigation; a definitive root cause could not be determined.Measures have been conducted to address this failure mode.Monitoring will continue to be performed for similar complaints.
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