• Acta Anaesthesiol Scand · Oct 1980

    The closed co-axial analgesia system.

    • J Waaben, S Jørgensen, H Oxhøj, and P Arnsbo.
    • Acta Anaesthesiol Scand. 1980 Oct 1; 24 (5): 433-6.

    AbstractA twin-tube system for nitrous oxide analgesia in dental surgeries is described. The system is a non-polluting modification of the Mapleson A system, employing the principle of co-axial tubing introduced by Bain & Spoerel (1972). Active, continuous and calibrated gas removal takes place via the co-axial tubing by means of an ejector flowmeter. Investigation of the dynamic pressure excursions occurring at the nose-piece are fully compatible with normal breathing. Gas contamination of the dental environment can be reduced by at least 90%. The system described is safe and easy to handle. It is made of light-weight material and is adaptable to the equipment available. No rebreathing takes place when using a fresh gas inflow of 150 ml/kg body weight/min.

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