(b)(4).Method: the complaint mr290v vented autofeed humidification chamber was returned to fisher & paykel healthcare (f&p) in new zealand where it was visually inspected and analysed.Results: visual inspection of the returned mr290v chamber revealed that the base was deformed at one location only.A mark caused by mechanical force was identified at the deformed location.The chamber was filled with water manually and pressurized with flow, no water leakage was observed.Rolled base thickness was measured on 4 sides, one of the measurements was out of specification.The out-of -specification measurement was located on the deformed side.Conclusion: we are unable to confirm the reported fault and determine the root cause of the reported event.However, our investigation indicates that the mark is most likely due to mechanical force and handling issue.Every mr290v chamber is pressure tested following the manufacturing process to check for any leaks present in the chamber due to cracks and other causes.Any chamber which fails this test is rejected.Also, the pressure test is followed by a visual inspection of each chamber.The subject mr290v chamber would have met the required specification at the time of production.The user instructions that accompany the mr290v vented autofeed humidification chamber state the following: "do not soak, wash, sterilize, or reuse this product.Avoid contact with chemicals, cleaning agents, or hand sanitizers." "ensure appropriate ventilator or flow source alarms are set before connecting breathing set to patient." "perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient." "do not use the chamber if the seals are not intact when received, or if it has been dropped.".
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