This duo-limb anesthesia circuit kit has separate inspiratory and expiratory limbs joined at a Y-piece, so inspired and expired gas travel in separate tubes. This is the standard configuration for circle absorber systems, where unidirectional valves direct the gas flow. Each kit is assembled from a fixed combination of circuit length, single tube, breathing bag and connectors.
The separate limbs are the defining feature of this circuit type. Because inspired and expired gas travel in different tubes, each limb can be managed independently: the expiratory limb can be fitted with a filter, and either limb can be replaced on its own. Separate limbs are the standard arrangement for circle absorber systems, where unidirectional valves direct the gas flow and lower fresh gas flows can be used.