Patent ID: 8328840

Claim:
A medical device for use in occluding a lumen of a body cavity, comprising: an expandable member having (a) an inner surface defining a lumen through the expandable member and (b) an outer surface; the expandable member being expandable from a first conformation to a second conformation; wherein the outer surface is configured to engage a surface of the body cavity when the expandable member is in the second conformation; and a flow-limiting member with first and second end portions opposite one another, the flow-limiting member residing within the lumen of, and coupled to, the expandable member; wherein the flow-limiting member comprises a valve, positioned at a first end section of the expandable member; the valve being movable between an open and a closed configuration; wherein the valve comprises a first leaflet and a second leaflet that are movable between the open configuration and the closed configuration, and when the first leaflet and the second leaflet are in the closed configuration, the first leaflet is in contact with the second leaflet; wherein the flow-limiting member is configured such that when a force directed proximally is exerted on the first end portion, the first end portion inverts from a non-inverted configuration to an inverted configuration such that the first end portion moves toward the second end portion and such that a bias force increases a contact pressure between the first leaflet and the second leaflet; wherein, when the first end portion is inverted, a distalmost surface of the flow-limiting member lies proximal to a distalmost surface of the expandable member; wherein, when in the closed configuration and placed in the lumen of the body cavity, the valve substantially prevents a flow of a fluid in the lumen of the body cavity past the flow-limiting member, and wherein, when the first portion inverts from the non-inverted configuration to the inverted configuration, the first and second leaflets remain substantially perpendicular to a direction of the inverting.