Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1988-11-23
1992-08-25
Burr, Edgar W.
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
128654, 128719, A61M 1600
Patent
active
051409810
ABSTRACT:
A patient breathing through a mask (34) receives breathing air from a breathing air system (A). A xenon gas supply (12) selectively supplies xenon or other enhancement gases into the breathing air. During each exhalation portion of a respiratory cycle, a portion of the exhaled gas passes through a narrow tube (40) to a xenon concentration detector (44) and a carbon dioxide concentration detector (46). A carbon dioxide concentration comparing circuit (54) compares the carbon dioxide concentration values with characteristics (56) of carbon dioxide concentration during an end-tidal portion of the exhalation respiratory cycle. Xenon concentrations read during the end-tidal portion of the respiratory cycle (62) are utilized to project a blood absorption curve (64). A plurality of CT images are generated by a CT scanner (B) as the blood xenon concentration increases. A look-up table array (90) preprogrammed in accordance with the Kety equations is addressed by the blood xenon concentration curve and the pixel values of the CT images to generate partition coefficient and flow values.
REFERENCES:
patent: 3890959 (1975-06-01), Youdin et al.
patent: 4535780 (1985-08-01), Gur et al.
patent: 4622976 (1986-11-01), Timpe et al.
patent: 4718432 (1988-01-01), Kimura et al.
patent: 4779621 (1988-10-01), Mattson
"Simultaneous Mass Spectrometry and Thermoconductivity . . . " by Gur, et al., Med. Phys. 11(2) Mar./Apr. 1984, pp. 209-212.
"Progress in Cerebrovascular Disease" by Gur, et al., Stroke, vol. 13, No. 6, 1982, pp. 750-758.
"Experimental Xenon Enhancement with CT Imaging: Cerebral Applications" by Drayer, et al., AJR, 134:39-44, Jan. 1980.
European Search Report dated Feb. 12, 1990.
Burr Edgar W.
Lewis Aaron J.
Picker International Inc.
LandOfFree
End-tidal gas detection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with End-tidal gas detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and End-tidal gas detection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-378387