(b)(4).Method: the complaint 900mr810 adult evatherm reusable breathing circuit was returned to fisher & paykel healthcare in (b)(4) for inspection.The returned breathing circuit was visually inspected.Results: visual inspection revealed a tear in the film near the chamber end cuff of the complaint circuit.A lot check revealed no other complaints of this nature for lot 160126.Conclusion: we are unable to determine what may have caused the damage noted on the returned 900mr810 breathing circuit.The customer has confirmed that the subject breathing circuit was in use for a few days before the reported damaged was observed.All 900mr810 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 900mr801 reusable adult breathing circuits 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.Clean circuit prior to use and after each patient use, using approved disinfection methods only.Use of unapproved cleaning methods may damage the circuit and reduce it useable life.Set appropriate ventilator alarms.
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