(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).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 not returned to fisher & paykel healthcare (f&p) for evaluation.Our investigation is based on the information, photograph and videography provided by the customer, and our knowledge of the product.Results: visual inspection of the photograph revealed that the complaint opt944 optiflow + adult nasal cannula tubing was detached from the 3-way connector.It was further observed that the tubing was stretched at the 3-way connector.Conclusion: we are unable to determine the cause of the reported damage to the subject opt944 optiflow + adult nasal cannula.However, the damage observed was likely caused by the tubing being pulled.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 rejected.The subject cannula would have met the specification at the time of production.The user instructions which accompany the opt944 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, to prevent loss of therapy."."failure to use the set-up described above can compromise performance and affect patient safety.".
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