(b)(4).The opt944 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 features a head strap clip which works in tandem with the tubing clip (attaches to the patient's clothing/bedding) to support the weight of the circuit and prevent the cannula being dislodged.Method: the complaint opt944 nasal cannula was not returned to fisher & paykel healthcare in (b)(4).Therefore, our investigation was performed based on the information provided by the customer and our knowledge of the product.Conclusion: we were unable to confirm what caused the pressure sores on the patient's ear.However, based on our knowledge of the product, pressure sores are often a result of incorrect set up.Fisher & paykel healthcare representative offered to provide further training regarding correct fitting and set up to the customer, however it was declined.The user instructions which accompany the opt944 nasal cannula contain pictorial instructions for setting up the nasal cannula.The instructions also state that the interface is intended to be used "for delivery of humidified respiratory gases" and includes the following cautions/warnings: - 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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