(b)(4).Method: the complaint rt266 infant dual heated evaqua2 breathing circuit was returned to fisher & paykel healthcare in new zealand for evaluation.The circuit was visually inspected and subsequently submerged in a water bath to determine the location of the leak.Results: visual inspection of the returned dryline revealed that the distal corrugation on the tube appeared to have been compressed and pinched.There was a pin-sized hole next to the compressed part of the corrugation.Stress marks were present on the chamber end tube collar.Visual inspection revealed that the circuit was damaged near the distal end connector and a pin-sized hole was noted on the tube.Stress marks were also noted on the chamber end connector on the returned dryline tube.The water bath test showed bubbles forming from the pin-sized hole.A lot check revealed one other complaint of this nature for lot 141212.Conclusion: we are unable to accurately determine what may have caused the damage observed on the returned dryline tube.The dryline tube is a supplied part and the supplier has informed us that the dryline tubes are visually inspected for pin holes during packaging.Additionally, fph perform a sample pressure and leak test of the dryline tubes received prior to assembling the circuits.The user instructions that accompany the rt266 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 hospital correctly tested the circuit prior to patient use, which is in line with our user instructions.
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