Apparatus and methods for reducing lung volume

A device for closing a bronchial passage, comprising:

• an annular body defining an opening therethrough and including a plurality of tines extending from the body away from the opening, the body being compressible from an expanded condition towards a contracted condition for facilitating introduction into a bronchial passage;
• and
• a flexible membrane extending across the opening for substantially sealing the opening from air flow therethrough.

A method for reducing volume of a lung using a closure device comprising a planar body from which a plurality of tines extend, the tines being movable between contracted and expanded conditions, the method comprising:

• advancing the closure device with the tines in the contracted condition along a bronchial passage to a predetermined location;
• and
• expanding the tines outwardly towards the expanded condition to engage tissue surrounding the predetermined location, whereby the planar body substantially seals the bronchial passage from air flow through the predetermined location.