A long term oxygen therapy system having an oxygen supply (102), directly linked with a patients lung or lungs, includes an oxygen source (102), one or more valves (106) and fluid carrying conduits (104). The fluid carrying conduits (104) link the oxygen source (102) to diseased sites within the patients lungs (108). A collateral ventilation bypass trap system (702) directly linked with a patients lung or lungs may be utilized to increase the expiratory flow from the diseased lung or lungs, thereby treating another aspect of chronic obstructive pulmonary disease. The system includes a trap (702), a filter/one-way valve (706) and an air carrying conduit (704). The system can be used to treat hypoxia caused by chronic obstructive pulmonary disease such as emphysema and chronic bronchitis.
