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Initial evaluation of the returned device found no leak on any part of the sample returned.The sample was then connected to an air source at 5psi and performed a dunk test.Again, no leaking was observed.The sample was inflated with air and clamped at all open ends and left for an hour in tray full of water to identify any leaks.Again, no leak was observed.The same process was repeated for the cassettes and left for an hour in tray full of water to identify any leak.The additive cassette was substantially less inflated than the arrest cassette indicating a leak.Under high pressure of 10psi the additive cassette leaked at the weld joint on the top of the cassette.The root cause was not determined.The device history record for the lot was reviewed and no devices were rejected and no specific manufacturing yield issues were reported similar to the reported complaint condition.
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