Radiometer Basel Ag

Jean-Nöel Fehr

Jean-Christophe Roulet

Lukas Scherer

Patrizia Weber

Julien Finci

The present invention relates to an apparatus () apparatus for the detection of carbon dioxide. It is described to place () a part of a housing in contact with a skin area of a patient. the part of the housing and a gas measuring chamber within the housing are configured such that gases diffusing through the skin area of the patient enter the gas measuring chamber. radiation is emitted () from a radiation source within the housing, wherein at least some of the radiation emitted by the radiation source enters the gas measuring chamber. The radiation entering the gas measuring chamber has wavelengths that extend over an absorption band of carbon dioxide and has wavelengths that extend over a region other than the absorption band of carbon dioxide. A radiation filter is positioned () relative to the gas measuring chamber such that an interaction radiation path is defined between the radiation source through the gas measuring chamber to the radiation filter. A first radiation detector is positioned () relative to the radiation filter such that a first detection radiation path is defined that is in addition to the interaction radiation path, and a second radiation detector is positioned relative to the radiation filter such that a second detection radiation path is defined that is in addition to the interaction radiation path. The radiation filter is configured such that radiation in the first detection radiation path has a wavelength that extends over the absorption band of carbon dioxide and with an intensity of radiation that extends over the region other than the absorption band being significantly less than that in the interaction radiation path. The radiation filter is also configured such that radiation in the second detection radiation path has a wavelength that extends over the region other than the absorption band of carbon dioxide and with an intensity of radiation that extends over the absorption band being significantly less than that in the interaction radiation path. a partial pressure of carbon dioxide is determined () in the skin of the patient using a signal from the first radiation detector and a signal from the second radiation detector.

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Brønshøj, Denmark

Jean-Nöel Fehr