APPARATUS FOR MEASURING HUMAN RESPIRATION

摘要

This invention relates to an inhalation device for use in inhalation of air into human lungs. The device comprises a first hollow cylindrical chamber for slidably receiving a piston, the chamber being vented to the atmosphere; and a movable piston assembly within the cylindrical chamber. At least a second hollow chamber is sealed from fluid communication with the first chamber, the second chamber communicating with the atmosphere. A breathing tube assembly is adapted to be in communication with said first and second hollow chambers. Connecting means connecting the breathing tube assembly with the first chamber and the second chamber for inhaling air from the first and the second chambers. A minor portion of the air comes from the first chamber and a major portion comes from the atmosphere through the second chamber.