(b)(4).Method: the complaint opt318 cannula was not made available for our inspection.Our investigation is based on a photograph provided by the hospital and our knowledge of the product.Results: visual inspection of the photograph revealed that the flexitube (cannula tubing) was damaged where it connects to the breathing circuit.The tubing was stretched and broken but the metal spring was still attached to the swivel grip.Conclusion: the damage to the flexitube is likely to have been caused by excessive pulling force being exerted on the tubing.All optiflow junior cannulae are 100% leak and occlusion tested after final assembly and any cannula that fails is discarded.In addition, samples are taken hourly from each run and pull tested to check glue joint strength at the cannula/tube joint, as well as the swivel grip joint.If there are any failures the entire batch is put aside for further investigation.The user instructions illustrate in pictorial format the correct set-up and proper use of the optiflow junior nasal cannula.They also state the following: ensure that all connections are secure during use.Check cannula is undamaged and that the flow path is maintained.Appropriate monitoring must be used at all times.Do not stretch or crush tube.
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