Surgical drainage device with metered air pump

摘要

A surgical underwater drainage device is provided for draining fluids from the body of a patient through an inlet tube. A metered air pump is fluidly connected to the inlet tube so as to deliver a metered amount of air to the inlet tube when excess negativity occurs there. A spring biased closed one-way valve in the metered air pump prevents atmospheric air from entering the inlet tube except during actuation of the metered air pump.