Graphical readout of laryngotracheal spectra and airway monitor

Details Graphical readout of laryngotracheal spectra and airway monitor Graphical readout of laryngotracheal spectra and airway monitor

1990-01-08

1991-10-22

Howell, Kyle L.

Surgery

Truss

Pad

128720, A61B 508

Patent

active

050586009

ABSTRACT:
A laryngotracheal airway spectra readout and monitor uses one or more miniature accelerometers placed on the outside of the neck of a patient to generate acoustic signals of patterns of breathing. The miniature accelerometers act as contact microphones which are sensitive to the physical vibration of breathing noise but otherwise insensitive to ambient and environmental noise. The acoustic signals are processed using Fast Fourier Transform (FFT) or other suitable acoustic analysis to generate a digitized spectra which may be printed out or recorded for later diagnostic analysis. The printoputs are in the form of a calibrated and normalized graphic readout which can be read by trained physicians or technicians in much the same way as EKGs. The digitized spectra is analyzed by comparing identified parameters of the spectra with a database of known parameters of normal and abnormal airways. Decision algorithms are then used to make diagnoses based on the comparison with the stored normal and abnormal parameter data, and the results of the diagnoses are presented graphically, either on screen or printed or both. Audible and/or visual alarms may also be generated if predetermined conditions are detected. In addition, records of current breathing analysis are stored and can be compared as a function of time to ascertain improvement or deterioration of a patient's condition.

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