Collapsible, disposable MDI spacer and method

A medication inhalation apparatus, comprising:

• an outer housing, movable between a collapsed state and an expanded state, wherein the collapsed state has a substantially flat configuration, and wherein the expanded state encompasses a first volume;
• an inner barrier positioned within the outer housing and, together with a mouth opening end of the outer housing, delineating a second volume;
• an inhaler opening formed at least partially within a wall of the outer housing at a first location, the inhaler opening in fluid communication with the first volume, wherein a mouth opening of a metered dose inhaler is insertable therein;
• a mouth opening positioned within a wall of the outer housing at a second location, the mouth opening in fluid communication with the second volume;
• a one-way inhalation valve positioned within a wall of the inner barrier and connecting the first volume and the second volume, wherein the inhalation valve is formed from the inner barrier;
• and
• a one-way exhalation valve positioned within a wall of the outer housing and the inner barrier at a third location, the exhalation valve connecting the second volume and the exterior of the outer housing, wherein the exhalation valve is formed from the outer housing,
• wherein the inhalation valve comprises at least one flap connected to the inner barrier by at least a first hinge, and wherein the exhalation valve comprises at least one flap connected to the outer housing by at least a second hinge;
• wherein the at least first and second hinges sit over at least first and second hinge recesses, respectively;
• wherein, in the expanded state, gas is flowable from the metered dose inhaler to the first volume, from the first volume to the second volume, and from the second volume to the mouth of a user, and
• wherein the apparatus is formed from a single, unitary sheet of stock.