(b)(4).The rt319 adult breathing circuit is not sold in the usa but it is similar to a product which is sold in the usa.The 510(k) for that product is k983112.Method: the complaint rt319 adult breathing circuit was returned to fisher & paykel healthcare in (b)(4) and was visually inspected.Our investigation is also based on our knowledge of the product, previous investigations and the information provided to us by the hospital.Results: no occlusions or holes were observed on any part of the returned breathing circuit.A lot check revealed no other complaints of this nature for lot 150520.Conclusion: we are unable to determine the cause of the reported leak on the returned breathing circuit.The hospital reported that a vented mask and exhalation adaptor was used with the complaint breathing circuit which possibly established a leak during the leak test.Based on this reported information, it is possible that the leak test failure occurred from use of a vented mask and exhalation port, as both parts have an intentional leak.If the leak test is performed with a vented mask and exhalation port, the intentional leak of one of them must be fully sealed.All rt319 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.The user instructions accompanied by the rt319 adult breathing circuit state: -"before connecting to patient, ensure that flow and pressure testing applicable to the ventilator has been completed." -"set appropriate ventilator alarms.
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