Breathing circuits having unconventional respiratory conduits and systems and methods for optimizing utilization of fresh gases

Abstract From the Canadian patent

A breathing circuit comprising first and second conduits is disclosed wherein at least one of the conduits is a non-conventional conduit. A multilumen unilimb breathing circuit is also disclosed having first and second conduits wherein when the proximal ends of said first and second conduits are each connected to an inlet and outlet fitting respectively, movement of the distal end of the first conduit causes a corresponding movement of the distal end of the second conduit. In an embodiment at least one of said conduits is coiled. In another embodiment a coiled conduit is contained within an outer flexible conduit that is axially extendable and compressible forming an unilimb multilumen …