Patent ID: 8900159

Claim:
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, the device comprising: a stationary flow restrictor for restricting the flow of air disposed within the airway, the restrictor comprising a plurality of openings and occlusions, the restrictor effective for causing a buildup of air pressure in the airway and oriented such that each inhaled and exhaled breath of 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 each inhaled and exhaled breath of air simultaneously pass through the airway and the first bypass channel, 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 in fluidly connected to the airway, wherein the airway defines a second pair of ports through which air may be diverted from the airway into the second bypass channel at an airtight junction, 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.