Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 12/5/2025

Anesthesia Machine Closed System Requirements

Understanding Circle System Requirements

  • The American Society of Anesthesiologists implies that circle systems require adequate CO2 absorbent supply, as guidelines mandate inspecting the CO2 absorber contents, connections, and checking the color of the absorbent before use 1, 2, 3, 4, 5
  • The use of alternative breathing systems, such as Bain-type circuits or other non-rebreathing systems that don't rely on CO2 absorption, is recommended by the American Society of Anesthesiologists 1, 2, 6, 7

Critical Safety Considerations

  • The Chinese Society of Anesthesiology recommends replacing CO2 absorbers between cases due to the large surface area that could harbor pathogens, particularly during COVID-19 or infectious cases 8