Method and apparatus for controlled flow sampling from the airwa

Details Method and apparatus for controlled flow sampling from the airwa Method and apparatus for controlled flow sampling from the airwa

1997-09-19

2000-05-30

Lewis, Aaron J.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820629, A61M 1600

Patent

active

060679832

ABSTRACT:
An apparatus and method for controlled flow sampling from the airway includes a mouthpiece, or a connector attached to a tube inserted in the subject's trachea, either of which is used to capture gases from the subject's airway. Attached to the mouthpiece or the connector is a total airway occlusion. A pump or vacuum source, maintained at a lower pressure than the pressure inside the airway, is connected to the total airway occlusion, pulling gas out of the airway independent of the subject's volition. The flow is maintained at a substantially constant rate chosen by the operator through control over the source of low pressure. As gases flow out of the airway, they flow through a gas analyzer which measures desired properties of the gas.

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Philip E. Silkoff et al., Marked Flow-dependence of Exhaled Nitric Oxide Using a New Technique to Exclude Nasal Nitric Oxide, Am. J. Respir. Crit. Care Med., 155:260-67 (1997).

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