(b)(4).The optfilow nasal interface is 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 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.The complaint opt842 (size small) nasal cannula was not available for evaluation as it was contaminated and had been discarded by the customer.Further information was sought but no response was received.The customer statement that the cannula had "poor connection between the interface and the tubing" suggests that the tubing was loose where it connects to the manifold.Conclusion: without further information or a device for evaluation we cannot confirm the nature of the problem as reported by the customer.All optiflow interfaces are inspected during production for visual defects including cracks, tears, inclusions, discolouration and stretching or deformation.Any product that fails the visual inspection is disposed of.The customer also informed us that the cannulae were used for approximately two days before failing.The user instructions which accompany the opt842 show in pictorial format the correct fitting and placement of the cannula and ad vise the user to "ensure nasal cannula is sized correctly and does not create a seal in the nares".They also.Contain the following warning: appropriate patient monitoring must be used at all times.Failure to monitor the patient may result in loss of therapy, serious injury or death.
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