Apparatus for the determination of the respiratory passageway im

Details Apparatus for the determination of the respiratory passageway im Apparatus for the determination of the respiratory passageway im

1978-03-15

1980-04-15

Cohen, Lee S.

Surgery

Truss

Pad

A61B 508

Patent

active

041978595

ABSTRACT:
In the illustrated embodiment, applied high frequency flow is divided into a first flow component traversing a known flow impedance and a second flow component directed toward the mouthpiece of a breathing tube. During calibration, the mouthpiece is sealed, and phase adjustments are made such that during measurement, applied flow and first flow component representing signals are essentially in phase and can be combined in an a.c. subtracter to provide a measure of the second flow component. A divider provides the quotient of rectified average pressure and second flow component signals as a measure of the magnitude (Z) of respiratory passageway impedance. A phase difference measurement circuit measures the phase difference between pressure and second flow components and can be switched over during calibration for use in the phase adjustment procedure. The real and imaginary components of respiratory passage impedance can be obtained using sample and hold circuitry responsive to the phase of the second flow component.

REFERENCES:
patent: 3598111 (1971-08-01), Kahn et al.
patent: 3713436 (1973-01-01), Hardway, Jr.
patent: 3726271 (1973-04-01), Mondshine et al.
patent: 4051843 (1977-10-01), Franetzki et al.
patent: 4082088 (1978-04-01), Franetzki et al.
patent: 4127115 (1978-11-01), Franetzki
Ross et al., "Direct Readout of Respiratory Impedance", Med. & Biol. Eng., vol. 14, No. 5, pp. 558-564, Sep. 1976.

Affiliated with

Also associated with

Rating

Apparatus for the determination of the respiratory passageway im does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for the determination of the respiratory passageway im, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for the determination of the respiratory passageway im will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-471727