Method and apparatus for measuring functional residual...

Surgery – Diagnostic testing – Respiratory

Reexamination Certificate

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C073S023300, C422S084000

Reexamination Certificate

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07465275

ABSTRACT:
The present invention relates to a method and an apparatus for measuring Functional Residual Capacity (CO). Further, it relates to a method and an apparatus for measuring cardiac output (CO). The method comprises the steps of determining the amount of oxygen and carbon dioxide being inhaled and exhaled during at least two breathing cycles, identifying at least one difference between said breathing cycles, and estimating the FRC and/or CO based on the determined uptake of oxygen and excretion of carbon dioxide and said identified difference.

REFERENCES:
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patent: 99/25244 (1999-05-01), None
patent: 00/67634 (2000-11-01), None
Measurement of Lung Volume by Sulfur Hexafluoride Washout during Spontaneous and Controlled Ventilation: Further Development of a Method, A. Larsson et al., Anesthesiology 67:543-550, 1987.
Automated sulfur hexafluoride washout functional residual capacity measurement system for any mode of mechanical ventilation as well as spontaneous respiration, Thomas D. East, PhD et al., Critcal Care Medicine, vol. 18, No. 1, 1990.
Perioperative functional residual capacity, R. W. M. Wahba MB BCh MSc(McGill) FRCPC; Can J. Anaesth 1991, 38:3, pp. 384-400.
A simple method to estimate functional residual capacity in mechanically ventilated patients, R. Fretschner et al., Intensive Care Med (1993) 19:372-376.
Continuous non-invasive monitoring of energy expenditure, oxygen consumption and alveolar ventilation during controlled ventilation: validation in an oxygen consuming lung model, K. Holk et al., Acta Anaesthesiol. Scand. 1996: 40, p. 539-537.
A deep breath method for noninvasive estimation of cardipulmonary parameters, Richard R. Mitchell, International Journal of Clinical Monitoring and Computing, 5:53-64, 1988.
Cardiopulmonary monitoring in the respiratory intensive care unit, John J. Osborn, M.D., Cardiopulmonary Monitoring in the Respiratory ICU, Medical Instrumentation, vol. 11, No. 5, Sep.-Oct. 1977, pp. 278-282.

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