The Reflector: a new method for saving anaesthetic vapours.

Area of Science:

• Anesthesiology
• Medical Engineering

Background:

• Minimizing volatile anesthetic use in anesthesia systems is crucial for reducing costs and environmental pollution.
• Closed-circuit anesthesia offers an ideal solution but presents practical challenges in routine clinical settings.

Purpose of the Study:

• To introduce and evaluate the efficacy of the Reflector system, an alternative anesthesia delivery method.
• To assess the reduction in volatile anesthetic consumption achieved by the Reflector system.

Main Methods:

• The Reflector system, a semi-closed circle anesthesia circuit with a CO2 absorber and automatic vaporizer, was designed.
• A zeolite filter (Reflector) was incorporated to act as a molecular sieve, retaining volatile anesthetics within the circuit.
• Isoflurane consumption was compared between the Reflector system and an open anesthesia system in bench tests and an animal study.

Main Results:

• Bench tests demonstrated a reduction in isoflurane consumption of 79% and 82% at respiratory frequencies of 10 and 20 min-1, respectively.
• The animal study showed a mean reduction in isoflurane consumption of 65% and 77% at the same respiratory frequencies.
• The Reflector system effectively prevented volatile anesthetic escape from the breathing circle.

Conclusions:

• The Reflector system offers a viable alternative to traditional open anesthesia systems.
• This innovative system significantly decreases volatile anesthetic usage, leading to potential cost savings and reduced environmental impact.
• The Reflector system simplifies anesthetic management while maintaining low volatile anesthetic concentrations.