Patent ID: 8235043

Claim:
A manually operable volume-adjustable ventilation device, comprising: a reservoir with an inlet mechanism, an outlet mechanism, and a volume adjuster configured to move a volume adjustment limit of the reservoir and change an expressed maximum volume of the reservoir; wherein said reservoir comprises a body having a plurality of movable rigid walls, wherein the plurality of movable walls are directly adjacent one another via movable structures, thereby defining an enclosed volume; wherein said reservoir has an uncompressed state and a fully compressed state; wherein said walls are movable with respect to each other, such that moving said walls expresses the volume adjustment limit of the reservoir; wherein the body in a fully compressed state comprises a vertically oriented height dimension when a major axis of the body is oriented generally horizontally, a first end, a second end, a central portion, a first transition zone between the first end and the central portion, and a second transition zone between the central portion and the second end; wherein the body decreases in the vertically oriented height dimension in the first transition zone between a first point on the first end to a first point on the central portion, and then increases in vertically oriented height dimension from a second point on the central portion to a first point on the second end in the second transition zone.