Device for trapping and assaying C14 labelled carbon dioxide and method of use
First Claim
1. A device for use in trapping and assaying 14CO2 in air exhaled by a person to which a 14C labelled compound has been administered, comprising first and second substantially flat oblong duct forming elements having long and short edges joined to each other at their respective edges except for one of their short edges and forming a duct between them, the first duct forming element including a gas permeable matrix element for absorption of CO2, the device being provided with an indicator for detection of CO2 absorption and a film element of low β
- -radiation absorptivity interposed or interposable between the matrix element and a β
-radiation measuring instrument.
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Accused Products
Abstract
A device for use in trapping and assaying 14CO2 in air exhaled by a person to which a 14CO labelled compound has been administered, in particular 14CO labelled urea, comprises first and second substantially flat oblong duct forming elements joined to each other at their edges except for one of their short edges and forming a duct between them. The first duct forming element includes a gas permeable matrix element for absorption of CO2. The device is provided with indicator means for visual detection of CO2 absorption and a film element of low β-radiation absorptivity interposed or interposable between the matrix element and a β-radiation measuring instrument. Also disclosed is a corresponding method.
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Citations
20 Claims
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1. A device for use in trapping and assaying 14CO2 in air exhaled by a person to which a 14C labelled compound has been administered, comprising first and second substantially flat oblong duct forming elements having long and short edges joined to each other at their respective edges except for one of their short edges and forming a duct between them, the first duct forming element including a gas permeable matrix element for absorption of CO2, the device being provided with an indicator for detection of CO2 absorption and a film element of low β
- -radiation absorptivity interposed or interposable between the matrix element and a β
-radiation measuring instrument. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20)
- -radiation absorptivity interposed or interposable between the matrix element and a β
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15. A method for trapping and assaying 14C exhaled by a person under investigation for a disease or condition characterised by increased enzymic activity in the gastro-intestinal tract leading to carbon dioxide formation from an enzymatically degradable agent administered to said person, comprising:
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making said person exhale into an open short end of a device comprising first and second substantially flat oblong duct forming elements joined to each other at their respective edges except for said short end, the first duct forming element having an air-permeable matrix element covered by or coverable by a protective element with low β
-radiation absorptivity, the matrix element including a carbon dioxide absorbant, the device further comprising an indicator for visual detection of CO2 uptake by change of colour;
observing the indicator to detect a colour change, and stopping exhalation into the device upon observation of such change;
optionally covering the matrix element with said protective element;
measuring β
-radiation originating from the matrix element for a period of time by bringing the device into contact with an apparatus for β
-radiation measurement; and
comparing the number of registered decay events with that obtained from healthy persons.
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Specification