(b)(4), method: the complaint mr290v vented autofeed humidification chambers were returned to fisher & paykel healthcare (f&p) in new zealand where they were visually inspected and analyzed.The customer reported usage of anaconda syringe which was connected to one of the inlet port.It was also reported that there was a spillage of medications which might be in contact with the mr290v.Results: visual inspection of the returned mr290v chambers revealed a large hole on both chamber dome.The location of holes were just right below one of the inlet port for both returned mr290v chambers.It was further noted that there was obvious sign of chemical attack (rough and bubbly dome finishing) around the hole.It is reasonably believed that the hole was caused by some unknown medications.Conclusion: based on the information provided by the customer and our investigation of the complaint device, the damage is most likely due to chemical attack.Every mr290v chamber is pressure tested following the manufacturing process to check for any leaks present 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.The subject chambers would have met the required specification prior to distribution.Our user instructions that accompany the mr290v vented autofeed humidification chamber states the following: "do not soak, wash, sterilize, or reuse this product.Avoid contact with chemicals, cleaning agents, or hand sanitizers." "use usp sterile water for inhalation or equivalent." "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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