A method for treating pleural effusion in a patient, the method comprising: providing a valve comprising: a body having a distal end, a proximal end and a lumen extending therebetween an inlet disposed at the proximal end of the body, the inlet being fluidically connected to the lumen an outlet disposed at the distal end of the body, the outlet being fluidically connected to the lumen and at least one valve element disposed in the lumen of the body, the at least one valve element being a one-way valve element configured to permit the passage of fluid in a single direction through the lumen of the body and implanting the valve in the body of the patient such that the inlet of the valve is fluidically connected to the pleural cavity of the patient, and such that the outlet of the valve is fluidically connected to a second body cavity.
