An implantable device for providing one-way flow of air through a lumen in
a human lung to reduce the volume of air trapped in a diseased portion of
the lung by occluding the lumen to prevent inhalation while permitting
expiration out of the diseased portion. The implantable device is
deployable in the lumen with a catheter. The device comprises an
umbrella-shaped, one-way valve. The valve is collapsible for containment
within a catheter and expandable in situ when deployed to occlude the
lumen. The valve defines a longitudinal axis and comprises a plurality of
metal struts, a resilient membrane, and a central post. The device
further comprises an anchor for securing the implantable device within
the lumen. The anchor comprises a tapered distal end for penetrating the
wall of the lumen, and a planar member positioned to limit advancement of
the anchor into the lumen. The implantable device further comprises a
mechanism connecting the one-way valve to the anchor. The mechanism is
disposed along the longitudinal axis when the device is collapsed. The
mechanism is configured to permit the valve to be oriented at an angle to
said anchor when deployed. Accordingly, the anchor can be positioned in a
section of the lumen that is at an angle to a section of said lumen in
which said one-way valve is positioned.