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US 5,492,111 AGranted
Method of elimination of volatile degradation products of sevoflurane during anesthesia
AssigneeUniversity of Iowa Research Foundation
InventorsJohn H. Tinker, Max T. Baker
Life of this patent
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Abstract
In the process of using sevoflurane as a rapid anesthetic, breakdown of the anesthetic to harmful compound A is slowed if not stopped altogether by cooling the CO.sub.2 scrubber to temperatures that still allow it to work effectively as scrubber but avoid sevoflurane degradation.
Claims6
A method of inducing anesthesia in mammals using volatile anesthetics, said method comprising the concurrent, continuous and repetitive steps of:
- administering by inhalation to a mammal effective amounts of a volatile anesthetic including sevoflurane or deuterated sevoflurane until a desired depth of anesthesia is achieved;
- providing a chemical carbon dioxide scrubber;
- and
- collecting exhaled gases including exhaled anesthetic from a mammal and passing such through said chemical carbon dioxide scrubber containing basic carbon dioxide absorbent chemicals and thereafter returning at least part of such gases from said chemical carbon dioxide scrubber including the anesthetic back to a mammal via the admisistering step;
- and
- reducing the formation of toxic compounds from volatile anesthetic in the chemical scrubber and the delivery thereof to a mammal by externally maintaining the scrubber and the chemicals thereof at temperatures less than about 30 degrees C. for countering exothermic heating due to the gas passage through the scubber.
3 more elements
Dependencies are inferred from the claim text.