System, method and device for aiding in the diagnosis of respiratory dysfunction

A device for aiding in the diagnosis of a respiratory dysfunction, the device comprising:

• an airway defining a longitudinal axis and having an inlet and an outlet through which a user breathes;
• a stationary flow restrictor comprising a plurality of openings and occlusions, the restrictor effective for causing a buildup of air pressure in the airway and for restricting the flow of air disposed within the airway, the restrictor effective for causing a buildup of air pressure in the airway wherein breathed air passing through the airway is diverted in part out of the airway and into a sensor disposed in a first bypass channel adjacent to the airway and in fluid communication with the airway, wherein portions of breathed air simultaneously pass through the airway and the first bypass channel to the outlet, wherein the airway defines a first pair of ports through which air may be diverted from the airway into the first bypass channel at an airtight junction;
• and
• a second bypass channel adjacent to the airway and fluidly connected to the airway,
• wherein the second bypass channel houses an oxygen sensor therein and/or thereon for measuring the concentration of oxygen in a breath to aid in the determination of respiratory dysfunction, and
• wherein the stationary flow restrictor disposed within the airway directs a portion of the flow of air out of the airway and into the second bypass channel wherein portions of breathed air simultaneously pass through the airway and the second bypass channel to the outlet.