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Canadian Journal of Anesthesia, Vol 26, 420-423, Copyright © 1979 by Canadian Anesthesiologists' Society

The "D Circle": Closed-Circuit Operation of the Bain Circuit

FRANK J. SASSE M.D.1, DAVID C. FLEMMING F.F.A.R.C.S.1, BRIAN HOFF M.D.1, N. TY SMITH M.D.2, and IRA J. RAMPIL M.S.1

1 Department of Anesthesiology, University of Wisconsin School of Medicine, Madison, Wisconsin 53792 U.S.A.
2 Department of Anesthesia, University of California, San Diego 92103 U.S.A.

Address reprint requests to Dr. Flemming.

A method of converting a Mapleson D (Bain) circuit to closed-circuit operation is presented, utilizing a laboratory air pump and a Waters carbon dioxide absorber canister to recirculate exhaled gas. The elimination of carbon dioxide from the circuit was studied and found to be adequate. The circuit would allow the use of low fresh gas flows for the maintenance of anaesthesia without the danger of carbon dioxide re breathing. We suggest that such a circuit could provide appropriate conditions of gas humidity and temperature for endotracheal anaesthesia. while realizing the advantage of a circulator in mask anaesthesia is possible. Further design considerations for a "D circle" breathing system for clinical use are discussed.






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Copyright © 1979 by the Canadian Anesthesiologists' Society.