Apparatus and method for use in non-invasively determining conditions in the circulatory system of a subject
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United States of America Patent
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Oct 4, 2005
Grant Date -
Jun 24, 2004
app pub date -
Dec 19, 2002
filing date -
Dec 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and method for providing breathing gases to a subject employs an exchanger taking up a quantity of a given component, such as CO2, from expiratory breathing gases passing through the exchanger and thereafter releasing the given component in inspiratory breathing gases subsequently passing through the exchanger. The exchanger may be selectively inserted in a flow path for the breathing gases for this purpose. Or, the breathing gases may be selectively passed through and bypassed around the exchanger. The apparatus and method may be used for non-invasive determination of the functional cardiac output of a patient using the differential form of the Fick equation.
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