Patent ID: 6708689
Filing Date: 2004-03-23
Classification: A61M

Abstract:
A breathing circuit system for ventilating an anesthetized patient, the system comprising:(a) a standard primary circle anaesthetic circuit comprising a one-way inspiratory limb for delivering re-breathed gas and a one-way expiratory limb for accepting expired gas; (b) a supplementary respiratory circuit for supplying non-rebreathed gas and comprising a source of non-rebreathed substantially carbon dioxide-free gas, a non-rebreathed fresh gas reservoir for storing fresh gas, a source of non-rebreathed reserve gas containing carbon dioxide whose PCO2 value is selectable, and a gas delivery conduit; (c) a non-rebreathing valve disposed in communication with the inspiratory limb; and (d) a respiratory valve disposed in communication with both the inspiratory limb and the delivery conduit for selectively permitting passage of gas from the inspiratory limb or from the delivery conduit.