(b)(4).Method: the complaint cannula was not returned to fisher & paykel healthcare for evaluation.Our investigation is based on information provided by the customer.We were informed that the nursing staff were not present when the incident occurred and that the patient alerted the nurse that the cannula tubing had disconnected from the part that connects to the breathing circuit.Additionally the customer confirmed that the clothing clip was not being used when the incident occurred.Conclusion: based on the customer statements, we can conclude that the cannula tubing had become disconnected from the distal swivel connector.Failure to use the clothing clip may have placed undue tension on the cannula tubing and led to the disconnection.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 setup instructions in the user instructions which accompany the opt944 nasal cannula include the following steps: ensure head strap clip is attached, to prevent cannula from being pulled out of the nares.Cannula can become unattached if not used with the head strap clip.Attach tubing clip to clothing/bedding to prevent cannula from pulling off face.The user instructions also contain the following warnings/cautions: 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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