(b)(4) method: the complaint (b)(4) vented autofeed humidification chamber was not returned to fisher & paykel healthcare (f&p) for evaluation.Therefore, our investigation is based on the information and video provided by the customer and our knowledge of the product.Results: visual inspection of the video provided by the customer revealed that water was leaking from the mr850 heater base when the mr290vx vented autofeed humidification chamber was connected to the heater base.The source of leakage was unable to be determined.Conclusion: without the complaint device, we are unable to determine what may have caused the reported event.The mr290 chambers are designed and tested to conform to iso 5367 breathing tubes intended for use with anaesthetic apparatus and ventilators.Every mr290 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 mr290vx chamber would have met the required specification at the time of production.The user instructions that accompany the mr290vx 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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