Abstract

In order to reduce comsumption of inhalational anaesthetsics during high-flow anaesthesia, a system open in regard to oxygen, nitrogen and nitrous oxide, but closed to inhalational anaesthetics, was developed. This was achieved by a reflecting filter for inhalational anaesthetics made of active carbon. The principle has been developed into the commercially available Anesthetic Conserving Device (ACD, AnaConDa®). The ACD is a modified heat and moisture exchanger containing a bacterial and viral filter as well as a carbon filter. The ACD can be used for administering the inhalational agents isoflurane and sevoflurane as an alternative to low-flow anaesthesia systems during surgery. It can also be used in intensive care units to administer sedation using isoflurane or sevoflurane to critically ill patients.

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