(b)(4).Method: three rt266 infant dual-heated evaqua2 breathing circuits and one rt266 expiratory limb were returned to fisher & paykel healthcare in (b)(4) for evaluation.The returned breathing circuits were visually inspected and the expiratory limb was also subjected to a water bath test.Results: visual inspection of the three breathing circuits revealed pin holes in all three inspiratory limbs and the proximal connectors on the three expiratory limbs were cracked.On one of the expiratory limbs the distal connector was also cracked.Visual inspection of the individual expiratory limb revealed that both the proximal and distal connectors were cracked.The hospital further reported that the circuits were used between 3-30 days and it was possible for the tubing to have been accidentally pulled.A lot check could not be carried out as the lot information was not provided by the hospital.Conclusion: we are unable to determine what may have caused the damage observed on the returned devices.However, the cracking noted on the expiratory limb connectors may have occurred as a result of the connectors coming into contact with cleaning chemicals or hand sanitizers.Using the circuits for longer than 7 days and pulling on the circuit may have also contributed to the observed damage.All infant breathing circuits are visually inspected and pressure and flow tested prior to being released for distribution.Any circuits that fail are rejected.This suggests the reported damage occurred after the circuits were released for distribution.The user instructions that accompany the rt266 infant evaqua2 breathing circuit state the following: "this product is to be used for a maximum of 7 days." "do not stretch or milk the tubing." "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" "do not soak, wash, sterilise or reuse this product.Avoid contact with chemicals, cleaning agents, or hand sanitizers".
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