(b)(4).The opt944 optiflow + adult nasal cannula is an interface used to deliver humidified oxygen to patients and consists of a lightweight delivery tube connected to a rigid plastic base and soft nasal prongs (nasal interface).This allows the device to be light weight and durable.The interface is held in place by a head strap and features a head strap clip which works in tandem with the tubing clip (attaches to the patient's clothing/bedding) to support the weight of the circuit and prevent the cannula being dislodged.Method: the complaint opt944 optiflow + adult nasal cannula was returned to fisher & paykel healthcare (f&p) new zealand for investigation, where it was visually inspected.Several attempts to request further information from healthcare facility were also made, however no response was provided by the healthcare facility.Results: visual inspection of the returned cannula revealed that the tubing was stretched and torn.Further information about the reported incident and the medical cause of death was requested but was not provided.Conclusion: we are unable to determine the cause of the reported event.However based on our knowledge of the product and our observation that the tubing was stretched and torn, the reported event was likely caused by the cannula being subjected to excessive force.It should be noted that the patient was covid-19 positive and was at the end of life.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 opt944 optiflow + adult nasal cannula would have met the required specifications.The user instructions which accompany the opt944 optiflow + adult nasal cannula show in pictorial format the correct placement and fitting of the cannula, including ensuring the headstrap clip and the tubing clip are appropriately attached.The user instructions also warn: "ensure head strap clip is attached, to prevent cannula from being pulled out of the nares." "cannula can become unattached if not used with the head strap clip." "attach tubing clip to clothing/bedding to prevent cannula from pulling off face." "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, to prevent loss of therapy." "failure to use the set-up described above can compromise performance and affect patient safety.".
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