Method of measuring cardiac related parameters...

A - Human Necessities – 61 – B

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A61B 5/083 (2006.01) A61B 5/08 (2006.01) A61M 16/00 (2006.01)

Patent

CA 2522623

An apparatus to measure cardiac output (Q) and other parameters such as alveolar ventilation (VA), minute CO2 elimination from the lung (VCO2 ), minute oxygen consumption (VO2), oxygenated mixed venous partial pressure of CO2, (PvCO2-oxy), true mixed venous partial pressure of CO2 (Pv CO2), PaCO2, mixed venous oxygen saturation (SvO2), pulmonary shunt, and anatomical dead space, consisting of: a) a breathing circuit with characteristics that: i. on exhalation, exhaled gas is kept substantially separate from inhaled gas; ii. oninhalation, when VE is greater than FGS flow, the subject inhales FGS first and then inhales a gas that is substantially SGS, for the balance of inhalation; b) gas sensor means for monitoring gas concentrations at the patient-circuit interface c) a first gas set (FGS), and a second gas set (SGS), said second gas set which may comprise previously exhaled gases or exogenous gases or both d) a gas flow control means for controlling the rate of FGS flow into the breathing circuit e) means to identify phase of breathing, said means may consist of pressure sensors or analysis of signal generated by gas sensors or other means known to those skilled in the art; f) machine intelligence consisting of a computer or logic circuit capable of controlling the gas flow control means, receiving the output of the gas sensor means and means to identify phased of breathing, and performing the calculations for measuring cardiac output and other parameters as outlined in the disclosure.

L'invention concerne un appareil destiné à mesurer la sorite cardiaque (<i>Q</i>) et d'autres paramètres notamment la ventilation alvéolaire (<i>VA</i>), l'élimination de CO¿2? minute des poumons (<i>VCO</i>¿2? ), la consommation d'oxygène minute (<i>VO</i>¿2?), la pression veineuse partielle mélangée, oxygénée de CO¿2?, (PvCO¿2?-oxy), la pression veineuse partielle mélangée réelle de CO¿2 ?(Pv CO¿2?), PaCO¿2?, la saturation d'oxygène veineux mélangé (SvO¿2?), la dérivation pulmonaire, et l'espace mort anatomique. Ce appareil consiste: a) en un circuit de respiration possédant les caractéristiques suivantes: i. lors de l'expiration, le gaz expiré est conservé sensiblement à part du gaz inhalé; ii. lors de l'inhalation, lorsque V<SB>E</SB> est supérieur au flux du premier ensemble de gaz (FGS), le sujet inhale ce premier ensemble de gaz, puis un gaz consistant sensiblement en un second ensemble de gaz, afin d'équilibrer l'inhalation; b) en des moyens de détection de gaz permettant de réguler les concentrations gazeuses au niveau de l'interface circuit du patient; c) en un premier ensemble de gaz (FGS), et en un second ensemble de gaz (SGS), ce second ensemble de gaz pouvant contenir des gaz préalablement expirés ou des gaz exogènes, ou les deux; d) en des moyens de commande du débit gazeux permettant de commander le débit de FGS dans le circuit respiratoire; e) en des moyens permettant d'identifier la phase respiratoire, ces moyens pouvant consister en des capteurs de pression ou d'analyse du signal produit par les capteurs de gaz ou d'autres moyens connus de ceux qualifiés dans l'art; f) en une intelligence machine consistant en un ordinateur ou un circuit logique capable de commander les moyens de commande du flux gazeux, de recevoir la sortie des moyens de détection du gaz et des moyens permettant d'identifier les phases respiratoires, et de mettre en oeuvre les calculs permettant de mesurer le débit cardiaque et d'autres paramètres, tel que souligné dans la description.

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