(b)(4).Method: both the complaint rt226 infant low flow breathing circuits were not returned to fisher & paykel healthcare (f&p) for evaluation.Our investigation is based on the customer's description of the event, photographs provided and our knowledge of the product.Results: visual inspection of the photographs provided by the customer shows that the swivel elbow and wye have disassembled.Conclusion: without the complaint device, we could not determine what caused the rt226 circuits swivels to disassemble.The infant swivel is assembled using a machine to ensure a consistent tightness of connection.The rt226 infant low flow breathing circuits are designed to conform to iso:5367.All rt226 circuits are visually inspected, pressure and flow tested during production and those that fail, are rejected.The user instructions that accompany the rt226 infant low flow breathing circuits also state the following: "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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