(b)(4).Method: the mr290v vented autofeed humidification chamber was discarded by the customer and was not available for evaluation.Our investigation is based on the event description reported by the customer and our knowledge of the product.Results: the customer reported that the mr290v chamber dome cracked.Conclusion: without the complaint device, we are unable to confirm the reported event.Every mr290v 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.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" - "ensure there is water supply connected to the chamber and that water is present within the chamber." our user instructions that accompany the mr850 respiratory humidifier state the following: - "ensure appropriate ventilator and/or patient monitor alarms are set, connections are secure and a leak test is completed before use.".
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