(b)(4).Method: the complaint rt265 infant breathing circuit was returned to fisher & paykel healthcare in (b)(4) for evaluation where it was visually inspected, pressure tested and the inspiratory and the expiratory limbs were resistance tested.Results: the swivel, which consists of two parts the swivel wye and elbow, was reassembled and formed a tight fit when reconnected.A visual inspection of the swivel revealed that there was a crack along one of the swivel wye ports.The circuit was pressure tested and the result was within specification.The resistance test revealed that the heater wire resistance of both circuit limbs was within specification.Conclusion: we were unable to determine the cause of the reported disconnection, as the swivel formed a tight fit with the circuit limbs when properly connected.All rt265 infant dual-heated evaqua2 breathing circuits are visually inspected and pressure and flow tested during production, and those that fail are rejected.Our user instructions that accompany the rt265 state the following: - "check all connections are tight before use." - "perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient." - "set appropriate ventilator alarms.
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