Sistema circular de anestesia para animais de pequeno porte: estudo das resistências ao fluxo de ar / Anesthetic circle system for small animals: study of the resistance to air flow

ABSTRACT

A circle system with carbon dioxide absorber was construted to allow reinhalation of anesthetic gases by small animals and to facilitate the control of the concentration of gases and the measurement of metabolic data. The resistance to air flow was evalueted under increasing air flows (o,25 to 10l); different diameters of tracheal tubes (2.5 to 4.0 mm); two types of connector increased (3.5 and 5.00 mm) and different volumes of canisters, with and without absorber. The results showed increased in flow and to decreases in the diameter of tracheal tubes and connectors. The three different volumes of canister, with or without absorber, did not induce variation in the resistance to air flow. Based on the results, the authors conclude that the proposed circle system can be used for anesthesia of small animals