Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
2006-01-10
2006-01-10
Bennett, Henry (Department: 3743)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S205110, C128S203140, C128S203250, C600S532000
Reexamination Certificate
active
06983750
ABSTRACT:
A method of determining ventilation inhomogeneity in the lungs is provided. During the first step of the method, a lung volume series is calculated from a series of measured lung inert gas concentrations and lung inert gas volumetric change measured data series. As a second step, the series of lung volumes is completed with a series of value representing the total gas exchange efficiency in the lungs. A global inert gas dilution ratio may be used for this purpose. The gas exchange efficiency values are such that less ventilation is represented by lower numbers. As the third step, the gas exchange efficiency series is plotted as an ordinate and lung volume series as an abscissa to form a graph. From this graph both the lung volume and homogeneity of ventilation become directly apparent.
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A new method for non-invasive, manoeuvre-free determination of “static” pressure-volume curves during dynamic/therapeutic mechanical ventilation, S. Karason et al., Acta Anaesthesiol Scand. 2000; 44; 578-585, Printed in Denmark.
Andrus Sceales Starke & Sawall LLP
Bennett Henry
Instrumentarium Corp.
Ragonese Andrea M.
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