(b)(4).Method: the complaint (b)(4) bi-level/cpap circuit was returned to fisher & paykel healthcare (f&p) in new zealand for evaluation, where it was visually inspected.Results: visual inspection of the returned rt139 circuit revealed that the red circuit label was found inside the tube next to the elbow connector.It was further noted that the elbow connector was found fully attached to the tube and the patient end connector was found partly detached.No damage was found to the tube or the connectors.Conclusion: based on the information provided by the customer and the results of the investigation, it is likely that the red circuit label was accidentally pushed inside the tube when reassembling the elbow connector to the tube.We are unable to determine the cause of loose connection however, it is possible that the caregiver accidentally pulled the connector when draining the circuit.All rt139 bi-level/cpap circuits are visually inspected and pressure and flow tested during production, and those that fail are rejected.The subject breathing circuit would have met the required specifications at the time of production.The user instructions that accompany the rt139 bi-level/cpap circuit state the following: - "check all connections are tight before use." - "check for occlusions in both inspiratory and pressure line before connecting to patient." - "before connecting to patient, ensure that flow and pressure testing applicable to the ventilator has been completed.".
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