(b)(4).Method: the complaint opt316 cannula has not been received at fisher & paykel healthcare (fph) for evaluation.Questions were sent in an effort to obtain further information and a request was made for the return of the complaint device, however no response has been received.Results: the customer had reported that "the optiflow junior cannula come apart where it connects to the purple colored lanyard." this suggests that the cannula tubing 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.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.In september 2016, as part of our ongoing product improvement initiatives, fph implemented improved detectability of potential swivel joint failures by increasing the infant optiflow tensile strength testing frequency.
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