(b)(4).The complaint pressure relief valve of an rt329 infant continuous flow breathing circuit kit was not returned to fisher & paykel healthcare for investigation.Due to the nature of the subject pressure relief valve, there are possible failures that could manifest in the stated event description.Without the complaint device, we are unable to confirm the reported fault or determine its root cause.The rt329 infant continuous flow breathing circuit kit includes a pressure relief valve which ensures patient safety by limiting the pressure delivered in the event of an occlusion, as well as allowing connection to a pressure monitoring device or an oxygen analyzer.All pressure manifolds are pressure tested and visually inspected prior to distribution, and those that fail are rejected.This suggests that the subject pressure relief valve became damaged after it was released for distribution.Our user instructions that accompany the rt329 infant continuous flow breathing circuit state the following: "discard product if the pressure relief valve is damaged or damage is suspected."; "check that all connections, caps and/or plugs are tight before use."; "perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient."; "patient monitoring is recommended."; "set appropriate ventilator alarms.".
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