Patent ID: 8770188

Claim:
A metered dose inhaler (MDI) spacer comprising: a body that defines a dose receiving chamber; a proximal end portion coupled with said body; a mouth port coupled with said proximal end portion and through which a metered dose of medication is configured to be inhaled by a user of said MDI spacer; a distal end portion coupled with said body; a combined one-way and flow rate control valve coupled with said distal end portion and configured for permitting external airflow into said dose receiving chamber and prohibiting internal airflow out of said dose receiving chamber from said distal end portion; a collar coupled with said distal end portion and configured for receiving and engaging an actuator shaft of a metered dose inhaler and forming a seal about an aerosol nozzle of said metered dose inhaler such that the metered dose of medication is conducted directly into said dose receiving chamber via said collar while airflow out of said dose receiving chamber via said distal end portion is prohibited; and an annular disk having a center aperture and a plurality of apertures positioned about the center aperture, the annular disk being positioned within the body between said combined one-way and flow rate control valve and said dose receiving chamber such that external airflow is directed into the dose receiving chamber, prior to mixing with the metered dose of medication, via the plurality of apertures and the metered dose of medication is directed into the dose receiving chamber via the center aperture.