(b)(4).Correction to section d4: lot information updated.Method: the complaint mr290v vented autofeed humidification chamber was returned to fisher & paykel healthcare for evaluation, where it was visually inspected.Results: visual inspection of the returned mr290v vented autofeed humidification chamber idenitifed a large vertical crack with stress marks near the bottom of the crack.Additionally, inspection found deformation to the chamber base.Conclusion: we are unable to determine the cause of the reported event.However, based on our investigation, it is likely due to transport damage.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.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.The subject mr290v chamber would have met the required specification at the time of production.Our 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."."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.".
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