The Stephens Anesthetic Machine
Features
The Stephens is a closed circuit anaesthetic machine with the advantages of simplicity of operation, minimal consumption or anesthetic agents and relatively low cost. The apparatus consists of a Stephens Universal Anesthetic Vaporiser, two soda lime canisters, a set of unidirectional valves, a reservoir or rebreathing bag, a flush valve (red), a blow off / scavenger valve, breathing hoses and "Y" piece, an oxygen flow meter and associated fittings.
The anesthetic circuit is of the circle type, with the vaporiser placed within the circle in the inspiratory side.
 In an apparatus of this type the animal inhales gas from the reservoir bag. Some or all of the inhaled gas can be caused to flow over the volatile liquid anesthetic contained within the vapouriser.
After leaving the vaporiser, the gas mixture passes along the inspiratory side of the circle to a mask or endotracheal tube and then to the animal's lungs. On exhalation the gas is directed along the expiratory side of the circle, through the two soda lime canisters and then into the reservoir bag by means of a set of unidirectional valves.
Features, maintenance and instructions.
Related Information
An Introduction to in-circle closed circuit Anesthesia
Low flow and closed circuit Anesthesia
Stephens FAQ
Frequently Asked Questions
Parts Diagram Of The Stephens
A detailed Diagram showing the components of the Stephens Anesthetic Machine
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