(b)(4).Method: the complaint rt265 infant dual-heated evaqua2 breathing circuit was returned to fisher & paykel healthcare (f&p) in (b)(4) for investigation where it was visually inspected.Results: visual inspection revealed the evaqua2 limb of the complaint breathing circuit to be cut about 10cm from the patient end connector.Conclusions: we are unable to determine the root cause of the reported event, however the tube appeared to be cut.All rt265 infant dual-heated evaqua2 breathing circuits are visually inspected and pressure and flow tested during production, and those that fail are rejected.The subject infant breathing circuit would have met the required specifications at the time of production.Our user instructions that accompany the rt265 infant dual-heated evaqua2 breathing circuit state the following: "do not soak, wash, sterilize, or reuse this product.Avoid contact with chemicals, cleaning agents, or hand sanitizers." "reuse may result in transmission of infectious substances, interruption to treatment, serious harm or death." "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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