John the only Asena I know of is the Alaris Medical Systems current range of infusion pumps, mainly syringe but including one volumetric pump. The syringe pump range includes a TIVA and a TCI pump used for intravenous anaesthesia with e.g. Propofol; Remifentanil ect.
http://www.alarismed.com/products/infusion.shtml Like RoJo I think your anaesthetists are referring to intravenous anaesthesia drug deliver not volatile anaesthetic agent delivery.
