Surgery – Respiratory method or device – Means for removing substance from respiratory gas
Reexamination Certificate
2011-08-02
2011-08-02
Yu, Justine R (Department: 3771)
Surgery
Respiratory method or device
Means for removing substance from respiratory gas
C128S204180, C128S205120, C128S205270, C095S139000
Reexamination Certificate
active
07987849
ABSTRACT:
A method for determining the consumption of a CO2absorber (8) in a respirator with a rebreathing system, with a fresh gas mixer (1) and with a computing and control unit (10). The rebreathing system has a respiration drive (2), a volume flow sensor (3) located in the inspiratory branch, a CO2absorber (8) located in the expiratory branch, whose output, combined with that of the fresh gas mixer (1), is fed into the inspiratory branch, a breathing gas escape valve (7) and a breathing gas reservoir (9). The computing and control unit (10) is connected to the fresh gas mixer (1), to the respiration drive (2) and to the volume flow sensor (3) in order to receive signals and send control commands. The fresh gas volume flowFGdischarged from the fresh gas mixer (1) and the inspiration volume flowIflowing into the inspiratory branch are determined in the method in the computing and control unit (10). A value for the purified rebreathing volume flowabsadmitted from the CO2absorber (8) is determined from the differenceI−FGof those values, and a rate of CO2absorption is determined herefrom on the basis of a preset CO2concentration value or from a CO2concentration value measured with a gas sensor in the expiratory branch and integrated over time in order to determine the quantity of CO2absorbed in the CO2absorber (8).
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Dräger Medical GmbH
Louis LaToya M
McGlew and Tuttle , P.C.
Yu Justine R
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