Bronchoscopic repair of air leaks in a lung

A system for use in treating an air leak in a lung, the system comprising:

• a balloon catheter configured to occlude an airway and to simultaneously measure a diameter of the airway;
• a delivery catheter configured to deliver an obstruction device into an airway of the lung;
• at least one occlusion device adapted to occlude airflow in an inspiratory direction while allowing fluid to flow in an expiratory direction;
• the occlusion device being configured such that fluid flow in the expiratory direction passes between an airway wall and a portion of the occlusion device;
• and
• the occlusion device further being configured to expand and contract during expansion and contraction of surrounding lung tissue during a respiration cycle.