(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: four opt844 nasal cannulae were received at fisher & paykel healthcare in (b)(4).Three devices were from lot 141127 (manufactured november 27 2014) and one was from lot 150211 (manufactured february 11 2015).The returned cannulae were visually inspected.Results: no fault was found with device 1.In device 2, the nasal prong was found disconnected on one side of the manifold.In device 3, the nasal prong was found loose on one side of the manifold.Device 4 was found sealed and unused with no fault found.A lot check revealed no other complaints of this nature for either of the lot numbers provided.Conclusions: the cannula manifold coming loose from the nasal interface can be caused by tightening the silicone buckle too firmly when adjusting the headstrap.All cannulas are visually inspected for cracks, tears, inclusions, discolouration and deformation prior to leaving production and those that fail are rejected.Our user instructions that accompany the product illustrate the procedure for fitting the optiflow nasal cannula to a patient.
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