End-tidal gas detection

Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas

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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:
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patent: 4535780 (1985-08-01), Gur et al.
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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.

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