Patent ID: 8721561

Claim:
A pulmonary testing device, comprising: a body with first and second ends, the first end comprising a mouthpiece for a patient and the second end being open to the ambient atmosphere; at least two test gas injectors positioned proximate to the second end forming a junction between each of the at least two test gas injectors and the body of the device, the injectors each being angled away from the first end at an angle measured relative to a centerline of the body and wherein the angle is less than 90 degrees, whereby a test gas is introduced into the body via the junctions at a direction away from the first end; a flow rate measuring device operable to determine a flow rate of gas being at least one of inspired and expired by the patient; a gas analyzer operable to measure a concentration of a selected test gas component during inhalation; and a controller operable to determine a volume of the selected test gas component, wherein the controller determines a volume of the selected test gas component by measuring the gas flow rate and using the concentration of the selected test gas-component measured by the gas analyzer.