(b)(4).Method: the complaint device mr290v humidification chamber was received at fisher & paykel healthcare (f&p) in new zealand where it was visually inspected.Results: visual inspection confirmed that a hole was found on the base of the chamber.Additionally, a stain was found on the inside of the chamber dome and base.It was also reported that the customer had used nebulized drugs with the complaint chamber.Conclusion: based on the information provided by the customer, our investigation and previous investigations of similar complaints, the cause of the degradation is due the use of nebuliuzed drugs corrosive to the aluminium mr290v chamber base.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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