Method and apparatus for determining airway resistance and lung

Details Method and apparatus for determining airway resistance and lung Method and apparatus for determining airway resistance and lung

1997-09-26

2000-05-30

Nasser, Robert L.

Surgery

Diagnostic testing

Respiratory

600529, 600538, A61B 500

Patent

active

060686022

ABSTRACT:
A method and apparatus is disclosed for determining airway resistance and lung compliance using an electrical circuit model wherein at least one component parameter is non-linear. The system non-intrusively obtains pressure and flow data signals from a pressure transducer and a laminar flow element without interrupting or interfering with normal breathing and gas supply to a patient. An invariant exponential is determined empirically based on physical characteristics of the airway. The non-linear airway resistance and lung compliance can then be calculated based on the sensed flow rate, gas pressure, a calculated gas volume, and the invariant exponential using linear techniques. The resulting airway resistance can be normalized to a standard reporting flow rate value. The system is particularly useful in anesthesia applications, but is also useful in any breathing system where fresh gas is supplied constantly from a gas source other than a ventilator.

REFERENCES:
patent: 5316009 (1994-05-01), Yamada
patent: 5318038 (1994-06-01), Jackson et al.
patent: 5522397 (1996-06-01), Vermaak
patent: 5680871 (1997-10-01), Ganshorn
patent: 5752921 (1998-05-01), Orr
Partitioning of Lung Tissue Response and Inhomogeneous Airway Constriction at the Airway Opening, Journal of Applied Physiology, vol. 82, No. 4, Apr. 1997, pp. 1349-1350, XP002087895.

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