Patent ID: 7314046

Claim:
A tubing assembly for delivering gas to a patient from a supply unit having a port defining a gas outlet, a fluid outlet, and a fluid inlet, said tubing assembly comprising: a tube having a gas passage to deliver gas toward a patient and a fluid passage to circulate fluid and transfer heat to gas in the gas passage; a fitting connected to said tube, said fitting having a gas inlet oriented to provide gas flow between the gas outlet of the supply unit and said gas passage of said tube, said fitting further comprising a fluid inlet oriented to provide fluid flow between the fluid outlet of the supply unit and said fluid passage of said tube, and said fitting further comprising a fluid outlet oriented to provide fluid flow between said fluid passage of said tube and the fluid inlet of the supply unit; said fitting of said tubing assembly being configured to provide flow communication between the gas outlet, the fluid outlet, and the fluid inlet of the supply unit and said gas passage and said fluid passage of said tube upon insertion of said fitting of said tubing assembly into the port of the supply unit; said fluid passage of said tube comprising a fluid supply passage extending from a proximal end to a distal end of said tube and a fluid return passage extending from said distal end to said proximal end of said tube, said fluid passage being configured to circulate fluid from said proximal end to said distal end of said tube through said fluid supply passage and from said distal end to said proximal end of said tube through said fluid return passage; said tubing assembly defining a passage for fluid flow between said fluid supply passage and said fluid return passage adjacent said distal end of said tube.