(b)(4).Method: the complaint rt114 adult inspiratory heated breathing circuits were not available to be returned to fisher & paykel healthcare in (b)(4) for investigation.Results: without the return of the complaint devices, we were unable to determine what may have caused the reported issue.All rt114 adult inspiratory heated breathing circuits are visually inspected and pressure and flow tested during production, and those that fail are rejected.The user reported that the damage was observed during use, which suggests that the complaint breathing circuit became damaged after it was released for distribution.The user instructions that accompany the rt114 adult inspiratory-heated breathing circuit state the following: - "do not stretch or milk the tubing." - "set appropriate ventilator alarms.".
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