(b)(4).Method: the complaint opt316 cannula was not received by fisher & paykel healthcare (fph) for evaluation.Further information received from the customer revealed that one of the two tubes had become detached from the swivel an hour after start of use, while the infant was being held by its mother.Results: from the information provided we can conclude that one of the two the cannula tubings had become detached from the distal swivel grip that connects to the breathing circuit.Conclusion: an in-depth root cause investigation was carried out to determine the cause of such failures.No evidence was found to suggest that our manufacturing process was out of specification at any time.In the absence of the device we were unable to determine the exact manner in which the subject cannula has failed, however it is possible that undue pressure had been placed on the device while the mother was moving around with the baby, causing it to dislodge.All optiflow junior cannulae are 100% leak and occlusion tested after final assembly and any cannula that fails is discarded.In addition, samples are taken hourly from each run and pull tested to check glue joint strength at the cannula/tube joint, as well as the swivel grip joint.If there are any failures the entire batch is put aside for further investigation.The user instructions illustrate in pictorial format the correct set-up and proper use of the optiflow junior nasal cannula.They also state the following: - ensure that all connections are secure during use.Check cannula is undamaged and that the flow path is maintained.- appropriate monitoring must be used at all times.- do not stretch or crush tube.As part of our ongoing product improvement initiatives, fph implemented additional testing and checking on the optiflow junior production line to further ensure that all product leaving the line meets specification.These measures were implemented in september and october 2016.
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