Surgery – Diagnostic testing – Respiratory
Reexamination Certificate
2005-04-26
2005-04-26
Nasser, Robert L. (Department: 3736)
Surgery
Diagnostic testing
Respiratory
C600S529000, C600S532000
Reexamination Certificate
active
06884222
ABSTRACT:
A method and apparatus for determining a user's Respiratory Quotient (RQ) using just measured O2and CO2concentrations without use of a flow meter. The RQ is determined by measuring the user's real-time inspired O2concentration (INS O2) and end tidal O2concentration (ETO2) and measuring the user's real-time inspired CO2concentration (INS CO2) and end tidal CO2concentration (ETCO2), and then determining the user's RQ from the measured INS O2, ETO2, INS CO2, and ETCO2 values in accordance with the following equation: RQ=(ETCO2−INS CO2)/(INS O2−ETO2). In order to avoid error introduced by the flow rate, the measurement steps are preferably performed while the user is in a resting condition. Also, ETCO2 is preferably measured as the maximum CO2value in a breath cycle of the user, while INS CO2 is preferably measured as the minimum CO2value in a breath cycle of the user. Similarly, ETO2 is preferably measured as the minimum O2value within a breath cycle of the user, while INS O2 is measured as the maximum O2value within a breath cycle of the user. On the other hand, the values of INS CO2 and ETCO2 also may be determined in accordance with the invention by analysis of a CO2waveform of a breath cycle of the user and the values of INS O2 and ETO2 determined by synchronizing timing of the O2waveform of a breath cycle of the user with the CO2waveform and sampling INS O2 and ETO2 values simultaneously with sampling of complementary CO2values determined by analysis of the CO2wavefomm. The RQ measuring device may include the oxygen and CO2sensors in a mainstream or sidestream configuration.
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Mallari Patricia C.
Nasser Robert L.
Woodcock & Washburn LLP
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