(b)(4).Method: the two complaint rt380 adult evaqua2 breathing circuits were received at fph in (b)(4) for investigation.The returned devices were visually inspected.Our investigation is also based on information reported by the customer and past investigations into similar complaints.Results: visual inspection revealed a cut in the expiratory limb of both breathing circuits.The location of the cuts in the expiratory limbs were also found to match the cuts found in the top of the packaging bags also returned.The cuts appeared to have been cut by a sharp object such as a knife or box cutter.The healthcare facility reported that a box cutter is used to open boxes containing circuit kits.Conclusion: based on our experience of similar investigations and the information reported by the customer, we can conclude the damage most likely occurred when the circuit packaging box was opened.All rt380 breathing circuits are visually inspected and pressure tested for leaks before releasing for distribution.Any breathing circuit which fails any of these tests is discarded.In addition, tube weighing and bond strength testing are performed every 15 minutes.If any faults are detected the whole batch is placed on hold for investigation.The user instructions supplied with the rt380 breathing circuit state: perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient; set appropriate ventilator alarms.The healthcare facility also stated that they would be more careful in the future when using box cutters.
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