A spirometer is an apparatus for measuring the volume of air inspired and expired by the lungs. It is a precision differential pressuretransducer for the measurements of respiration flow rates. The spirometer records the amount of air and the rate of air that is breathed in and out over a specified time. The Spirometer and attached flow head function together as a pneumotachometer, with an output signal proportional to airflow. It was invented by John Hutchinson in 1846. Volume, also called capacity, is a quantification of how much space an object occupies. ... AIR is a three-letter abbreviation with multiple meanings, as described below: The Annals of Improbable Research, a monthly magazine devoted to scientific humour All India Radio - Indias Government Radio service AIR, a popular electronica band from France. ... The lungs flank the heart and great vessels in the chest cavity. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ... A transducer is a device, usually electrical or electronic, that converts one type of energy to another. ... Breathing transports oxygen into the body and carbon dioxide out of the body. ...
The output produced by a spirometer is called a kymograph trace. From this, vital capacity, tidal volume, breathing rate and ventilation rate (=tidal volume x breathing rate) can be calculated. From the overall decline on the graph, the oxygen uptake can also be measured. Vital capacity is the total amount of air that a person can expire after a complete inspiration. ... The average pair of human lungs can hold about 6 litres of air, but only a small amount is used during normal breathing. ...
A modern USB-based spirometer, http://www.iqteq.com
An example of a modern spirometer printout, http://www.iqteq.com
Image File history File linksMetadata Spiro12. ... Image File history File linksMetadata Spiro12. ... Note: USB may also mean upper sideband in radio. ... Image File history File linksMetadata Download high resolution version (827x740, 323 KB)Printout of a Spirometer report. ... Image File history File linksMetadata Download high resolution version (827x740, 323 KB)Printout of a Spirometer report. ...
Spirometers that comprise a closed space connected to a subject’s airway, record the volume changes of the lung.
Spirometers with gas conditioning are mainly applied for measuring residual volume and total lung capacity by the helium dilution method, for simple spirometric tests
The water-sealed spirometer shown schematically in the illustration has been replaced in most laboratories by spirometers in which a rolling seal replaces the water seal, and the movements of the spirometer bell are recorded electronically.
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