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Circle systems with a coaxial inspiratory limb
Author(s) -
COOK L. B.,
CHAKRABARTI M. K.
Publication year - 1996
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/j.1365-2044.1996.tb13642.x
Subject(s) - coaxial , medicine , tube (container) , anesthesia , fresh gas flow , flow (mathematics) , anatomy , biomedical engineering , mechanics , telecommunications , composite material , materials science , computer science , physics , sevoflurane
Summary A laboratory study of a new circle system is presented. The inspiratory limb encloses a coaxial tube, delivering fresh gas close to the patient, immediately upstream of the inspiratory one‐way valve. The system is more efficient than the non‐coaxial system and allows the expiratory valve to be situated conveniently at the canister end of the expiratory limb. A disadvantage of low flow anaesthesia is the sluggish response of the system to changes in vapour or oxygen concentrations in the fresh gas flow. This is markedly improved by the new system. The advantages of the system are largely independent of respiratory pattern.