(b)(4).Method: three complaint 900mr810 reusable adult breathing circuits were returned to fisher & paykel healthcare in (b)(4).The circuits were visually inspected, the bead width, bead height and outside diameter were measured and the film thickness was measured.Results: visual inspection revealed a tear in the film near the chamber end cuffs of all three complaint tubes.The measured bead width, bead height and outside diameter were within specification, as was the measured film thickness.A lot check revealed no other complaints of this nature for lot 130531.Conclusion: we are unable to determine what may have caused the damage noted on the returned 900mr810 breathing circuits.However, it is possible that the limbs may have been pulled at the tube instead of at the cuff.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 circuits were 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.- set appropriate ventilator alarms.
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