(b)(4).Method: the complaint rt380 adult dual heated evaqua2 breathing circuit was received at fisher & paykel healthcare in (b)(4) for evaluation and was visually inspected, pressure tested, and water bath tested.Results: pressure testing confirmed that the circuit was out of specification.A water bath test and visual inspection revealed that the leak was due to a small cut in the expiratory limb.The cut section was smooth and straight.Conclusion: based on our findings, the limb had been cut with a sharp object, most likely due to opening the box or device bag with a knife or box-cutter.All rt380 circuits are visually inspected and pressure and flow tested during production, and those that fail are rejected.The user instructions that accompany the rt380 adult dual heated evaqua2 breathing circuit state: - "do not soak, wash, sterilize or reuse this product.Avoid contact with chemicals, cleaning agents or hand sanitizers." - "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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