(b)(4).Method: the complaint mr290v vented autofeed humidification chamber was received at fisher & paykel healthcare (f&p) in new zealand where it was visually inspected and analysed.Results: visual inspection confirmed that a hole was found in the base of the chamber.The customer also reported that nebulized drugs were used with the chamber.Conclusion: the degradation of the aluminium baseplate is likely due to the drugs nebulized into the mr290v vented autofeed humidification chamber.The presence of drug residue and chemicals could cause degradation of the aluminium plate over time.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 chamber 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.".
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