(b)(4).The opt844 interface is used to deliver humidified oxygen to patients.The opt844 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 which 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 opt844 nasal cannula has not been returned to fisher & paykel healthcare (b)(4) for evaluation.Our investigation is based on photographs and an assessment provided by our regional office in (b)(4).Result: visual inspection of the provided photographs revealed that the tubing of the opt844 was detached from the manifold.The tubing appeared stretched and pulled at the proximal end.Conclusion: the customer informed us that the cannula was in use for 24 hours before the damage occurred, which suggests the cannula was fine when it was put on the patient and that it operated correctly for that period.The observed damage is most likely the result of pulling on the cannula tubing with undue force.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 user instructions which accompany the opt844 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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