Air circulation apparatus and methods for plethysmographic measurement chambers
First Claim
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1. A plethysmographic measurement system, comprising:
- a plethysmographic measurement chamber;
plethysmographic measurement components coupled to the measurement chamber, the measurement components comprising a volume perturbation element and means for determining pressure within the chamber; and
an air circulation system coupled between the measurement chamber and an atmospheric environment outside the measurement chamber,wherein the air circulation system renews air within the measurement chamber using air from the atmospheric environment outside the chamber during plethysmographic measurement.
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Abstract
Apparatus and methods relating to circulation of air within a plethysmographic measurement chamber are provided. An air circulation system, comprised of one or more pumps, is coupled to a plethysmographic measurement chamber using one or more inlet and exhaust tubes. The air circulation system renews the air within the measurement chamber using ambient air, or air derived from a controlled temperature environment.
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Citations
51 Claims
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1. A plethysmographic measurement system, comprising:
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a plethysmographic measurement chamber; plethysmographic measurement components coupled to the measurement chamber, the measurement components comprising a volume perturbation element and means for determining pressure within the chamber; and an air circulation system coupled between the measurement chamber and an atmospheric environment outside the measurement chamber, wherein the air circulation system renews air within the measurement chamber using air from the atmospheric environment outside the chamber during plethysmographic measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 38)
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- 36. The system of clam 35, wherein the temperature monitoring circuitry maintains a constant temperature within the controlled temperature environment.
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39. A method of conducting plethysmographic measurement of a test subject, comprising:
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placing the subject to be measured in a plethysmographic measurement chamber, sealing said chamber; conducting plethysmographic measurement of the subject, and renewing air within the chamber using air from an atmospheric environment outside the chamber, wherein conducting plethysmographic measurement comprises; generating pressure oscillations within the chamber, measuring the amplitude of the pressure oscillations, calculating a volume of air within the chamber based on the measured pressure oscillations, and determining a body composition of the test subject based on the calculated volume of air within the chamber. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47)
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48. A plethysmographic measurement system, comprising:
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a plethysmographic measurement chamber; plethysmographic measurement components coupled to the measurement chamber; and an air circulation system coupled between the measurement chamber and an atmospheric environment outside the measurement chamber, wherein the air circulation system renews air within the measurement chamber using air from the atmospheric environment outside the chamber during plethysmographic measurement, wherein the air circulation system comprises; a pump assembly, an inlet tube coupled between the measurement chamber and the pump assembly, and an exhaust tube coupled between the measurement chamber and pump assembly.
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49. A plethysmographic measurement system, comprising:
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a plethysmographic measurement chamber; plethysmographic measurement components coupled to the measurement chamber; and an air circulation system coupled between the measurement chamber and an atmospheric environment outside the measurement chamber, wherein the air circulation system renews air within the measurement chamber using air from the atmospheric environment outside the chamber during plethysmographic measurement, wherein the air circulation system comprises; a pump assembly, an inlet manifold, an inlet manifold tube coupled between the pump assembly and the inlet manifold, at least one inlet chamber tube coupled between the inlet manifold and the measurement chamber, an exhaust manifold, an exhaust manifold tube coupled between the exhaust manifold and the pump assembly, and at least one exhaust chamber tube coupled between the exhaust manifold and the measurement chamber.
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50. A plethysmographic measurement system, comprising:
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a plethysmographic measurement chamber; plethysmographic measurement components coupled to the measurement chamber; an air circulation system coupled between the measurement chamber and an atmospheric environment outside the measurement chamber, wherein the air circulation system renews air within the measurement chamber using air from the atmospheric environment outside the chamber during plethysmographic measurement; and a controlled temperature environment, wherein the air circulation system pumps air from the controlled temperature environment into the chamber.
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51. A method of conducting plethysmographic measurement of a test subject, comprising:
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placing the subject to be measured in a plethysmographic measurement chamber, sealing said chamber; conducting plethysmographic measurement of the subject; renewing air within the chamber using air from an atmospheric environment outside the chamber; and maintaining a constant flow rate of air being circulated through the chamber.
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Specification