(b)(4).Method: the mr290hfv vented autofeed humidification chamber was returned to f&p healthcare in new zealand where it was visually inspected and analysed.Results: visual inspection of the returned mr290hfv vented autofeed humidification chamber confirmed a vertical crack in the chamber dome.Conclusion: we are unable to determine the cause.The mr290hfv chambers are designed and tested to conform to iso 5367 breathing tubes intended for use with anaesthetic apparatus and ventilators.Every mr290hfv chamber is pressure tested following the manufacturing process to check for any leaks present in the chamber dome due to cracks and other causes.Any chamber which fails this test is rejected.In addition, the pressure test is followed by a visual inspection of each chamber.No cracks in the chamber dome are acceptable.Any chamber that fails this inspection is rejected.Our user instructions that accompany the mr290hfv 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." "use of the mr290 above the maximum operating pressure may lead to cracking, water leakage and, on rare occasions, could lead to a loss of ventilation pressure." "do not use the chamber if the seals are not intact when received, or if it has been dropped.".
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A healthcare facility in canada reported, via a fisher & paykel healthcare (f&p) field representative, that a mr290hfv vented autofeed humidification chamber was being used with a ventilator in niv cpap mode.After approximately half an hour of patient use the ventilator was alarming for a leakage.On investigation by the clinician subject it was identified that there was a crack in the mr290hfv vented autofeed humidification chamber.There was no reported patient consequence.
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