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(b)(4).The opt842 optiflow adult nasal cannula is used to deliver humidified oxygen to patients.The opt842 consists of a lightweight delivery tube which is connected to a rigid plastic base and soft nasal prongs (nasal interface).The interface is held in place by a head strap and also includes a lanyard that is placed around the patient's neck or attached to the patient's clothing or bedding to remove the load of the breathing circuit from the patient's nares.Method: the complaint opt842 optiflow adult nasal cannulas were not returned to fisher & paykel healthcare (f&p) for evaluation.Our investigation is thus based on the information and photographs provided by the customer, and our knowledge of the product.Result: visual inspection of the provided photographs revealed that the nasal prongs were found broken at the right headgear connection point.Conclusion: without the complaint devices, we are unable to determine the cause of the reported event.However, the cause of the reported event is most likely due to overtightening of the head straps.All optiflow interfaces are inspected during production for visual defects including cracks, tears, inclusions, discoloration and stretching or deformation.Any product that fails the visual inspection is disposed of.The subject cannulas would have met the specification at the time of production.The user instructions which accompany the opt842 optiflow adult nasal cannula show in pictorial format the correct placement and fitting of the cannula and also warn: "appropriate patient monitoring must be used at all times.Failure to monitor the patient may result in loss of therapy, serious injury or death." "do not crush or stretch tube.".
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