Interface device and method for supplying gas flow for subject breathing and apparatus for supplying anesthetic agent to the interface device

A method for supplying the gas flow from an interface device

• for subject breathing, said method comprising:
• connecting detachably an apparatus for supplying anesthetic agent to at least one socket of said interface device;
• delivering a fresh gas through at least one gas output opening of said at least one socket to said apparatus;
• receiving through at least one input opening of said at least one socket from said apparatus the fresh gas mixed with anesthetic agent to provide further for subject breathing;
• and
• providing gas flow communication in said interface device between a connection valve and at least four ports, a first port receiving the fresh gas guided to said device, a second port providing a gas flow communication with said at least one gas output opening, a third port providing a gas flow communication with said at least one gas input opening, and a fourth port providing a gas flow communication for subject breathing, said connection valve having a first operational state disconnecting a gas flow communication between said first port and said second port and also providing a gas flow communication between said first port and said fourth port, and a second operational state providing a gas flow communication between said first port and said second port and also providing a gas flow communication between said third port and said fourth port.