(b)(4).Method: the complaint (b)(4).Vented autofeed humidification chamber was not returned to fisher & paykel healthcare for evaluation.Our investigation is thus based on the information and photographs provided by the customer, previous investigations of similar complaints, and our knowledge of the product.Results: visual inspection of the provided photographs revealed a hole in base of chamber and deposits can be seen on the aluminum base and heater plate.Conclusion: without the complaint device, we are unable to determine the cause of the reported event.However, the cause of the chamber base damaged was most likely due to contamination induced corrosion.The (b)(4).Chambers are designed and tested to conform to iso 5367 breathing tubes intended for use with anaesthetic apparatus and ventilators.Every (b)(4).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 (b)(4).Chamber would have met the required specification at the time of production.Our user instructions that accompany the (b)(4).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." - "use usp sterile water for inhalation or equivalent for humidification.Do not add other substances to the water.".
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