Absorption of carbon dioxide gas contained in exhalation of inhalation anesthetic subject
First Claim
1. A method of removing carbon dioxide gas from exhalation of a patient who is under inhalation anesthesia, consisting of the steps ofadministering to a patient, in a closed or semiclosed anesthetic system an inhalation anesthetic which is a compound having first and second carbon atoms which are adjacent to each other, said first carbon atom being bonded to at least one halogen atom, said second carbon atom being bonded to at least one hydrogen atom, andbringing exhalation of the patient into contact with an absorbent which absorbs carbon dioxide gas, characterized in that a magnesium compound is used as the principal material of said absorbent, and the inhalation anesthetic remains substantially undecomposed during absorption.
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Abstract
Concerning the recirculation of an inhalation anesthetic in a closed or semiclosed anesthetic system, the object of the invention is removing carbon dioxide gas from the exhalation of the patient under inhalation anesthesia by using an absorbent which hardly causes decomposition of the anesthetic remaining in the exhalation. The object is accomplished by using a magnesium compound such as magnesium oxide, magnesium hydroxide or magnesium hydroxycarbonate as the principal material of the absorbent to absorb carbon dioxide gas. It is preferred to use magnesium hydroxide with addition of a small amount of water.
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9 Claims
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1. A method of removing carbon dioxide gas from exhalation of a patient who is under inhalation anesthesia, consisting of the steps of
administering to a patient, in a closed or semiclosed anesthetic system an inhalation anesthetic which is a compound having first and second carbon atoms which are adjacent to each other, said first carbon atom being bonded to at least one halogen atom, said second carbon atom being bonded to at least one hydrogen atom, and bringing exhalation of the patient into contact with an absorbent which absorbs carbon dioxide gas, characterized in that a magnesium compound is used as the principal material of said absorbent, and the inhalation anesthetic remains substantially undecomposed during absorption.
Specification