(b)(4).Method: the complaint (b)(4) reusable adult breathing circuit was returned to fisher & paykel healthcare in (b)(4) for evaluation.The returned circuit was visually inspected and the resistance of the heater wire was measured using a calibrated multimeter.Results: visual inspection revealed that the tube was melted approximately 41 cm from the distal connector.No damage was noted to the heater wire.Resistance test of the heater wire showed that it was within specification.A lot check revealed no other complaints of this nature for lot 141223.Conclusion: based on the inspection conducted the damage observed on the returned breathing circuit was most likely caused by an external heat source.The only source of heat in the breathing circuit is the heater wire which was not damaged.All (b)(4) reusable adult breathing circuits are visually inspected and pressure tested prior to being released for distribution.Any circuits that fail are rejected.This suggests the reported damage occurred after the subject breathing circuit was released for distribution.The user instructions that accompany the (b)(4) reusable adult breathing circuit state: "inspect circuit before re-use, do not use if the circuit shows signs of deterioration such as: cracks, tears or damage." "perform a pressure and leak test on the breathing system, and check for occlusions before connecting to a patient." "disconnect tube by handling end connectors only, do not pull or twist tubing as this may cause damage." "set appropriate ventilator alarms.".
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