Upon removal of the returned chest drain from its packaging it was clear that there was water in the water seal.The drain was in good condition when received and still had plural fluid within the drain.When a chest drain is set up 45ml of water is to be filled through the suction port as indicated in the instructions for use.The returned drain exhibited the appropriate amount of water in the water seal chamber.It is not clear as to why the complainant was unaware of the fluid in water seal of the drain.A response received to a question asked indicated that the drain had been tipped over, and if this were the case the water would drain from the water seal chamber, but once the drain was placed upright the water would go back into the water seal chamber and the drain would function normally.In order to confirm the returned drain functioned properly the returned drain was disinfected and was set-up per the ifu and tested.An external vacuum of -80 mmhg was applied to the suction nozzle.The regulator was cycled from -10cmh2o to -40cmh2o and the output pressure verified.The regulator was regulating the vacuum pressure as expected and the drain was functioning appropriately.Based on the investigation results of the returned drain, the reported complaint of the water seal not containing water cannot be confirmed because the drain function appropriately.
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