Surgery – Diagnostic testing – Respiratory
Patent
1997-10-29
2000-11-07
Leubecker, John P.
Surgery
Diagnostic testing
Respiratory
600532, 600538, 600529, 600484, A61B 5085
Patent
active
06142952&
ABSTRACT:
A pressurized breathable gas, preferably air, is supplied to the patient's airways with an interface including a mask and a flexible hose. A selected oscillation component or forced probing signal is applied or superposed on the pressurized breathable gas, preferably with a loudspeaker coupled to a frequency generator. Pressure and flow of the breathable gas in the interface are measured or sampled, preferably using pressure transducers and a pneumotachometer coupled to a personal computer, to obtain pressure and flow data characteristic of the patient's airway. The pressure and flow data are converted to the frequency domain using Fourier transform or cross-power spectrum techniques in the personal computer. A function of the processed pressure and flow data is obtained to determine an index of airway impedance or degree of airway obstruction.
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Behbehani Khosrow
Burk John R.
Lucas Edgar R.
Yen Fu-Chung
Gibson Roy
Leubecker John P.
The Board of Regents The University of Texas System
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