Calibration methods and apparatus for plethysmographic...

A - Human Necessities – 61 – B

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A61B 5/02 (2006.01) A61B 5/103 (2006.01)

Patent

CA 2471944

Methods and apparatus for calibrating volume measurement in a plethysmographic chamber are described. The present invention involves the use of a calibration volume chamber of known volume (36) coupled to a plethysmographic measurement chamber in a plethysmographic measurement system (30) for determining body composition (22), wherein a computer system (30) calibrates the measurement system prior to conducting a volume (36) measurement of a test subject, by measuring the chamber volume before and after opening an electronically controlled valve (40) that connects the controlled calibration volume to the plethysmographic chamber, and comparing the measured chamber volumes based on the known reference (36) volume.

L'invention concerne des procédés et un appareil d'étalonnage d'une mesure volumétrique dans une chambre pléthysmographique. Elle concerne également l'utilisation d'une chambre volumétrique d'étalonnage, dont le volume est connu, couplée à une chambre de mesure pléthysmographique d'un système de mesure pléthysmographique, afin de déterminer la composition corporelle. Un système informatique étalonne le système de mesure préalablement à la réalisation d'une mesure volumétrique d'un sujet d'essai, en mesurant le volume de la chambre avant et après l'ouverture d'une soupape à commande électronique reliant le volume d'étalonnage régulé à la chambre pléthysmographique, puis en comparant les volumes de la chambre mesurés, sur la base du volume de référence connu.

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