Respirator with two jet gas injection tubes

A high-frequency respirator comprising;

• a double tube with inner and outer tubes disposed in a substantially concentric arrangement with each other, said inner tube having first and second openings at opposite ends thereof with respect to its longitudinal direction and said outer tube having third and fourth openings, said third opening being formed at one end thereof with respect to its longitudinal direction and said fourth opening being formed in the wall of the outer tube at the vicinity of the other end thereof, wherein said first opening opens into said outer tube at the vicinity of said third opening and the periphery of said second opening is formed integral with the other end of said outer tube;
• an endotracheal cannula coupled to said double tube through said third opening;
• first communication tube means coupled to said double tube through said second opening for feeding a respiration gas to be supplied from a gas source to said endotracheal cannula through said inner tube;
• second communication tube means coupled at one end thereof to said double tube through said fourth opening and opening into air at the other end thereof, said second communication tube means being mounted with first and second jet gas injection tubes positioned at the vicinity of said other end, said first injection tube being directed toward said one end of said second communication tube means and said second injection tube being directed toward said the other end of said second communication tube means;
• and
• high-frequency ventilation means having first and second outlet ports for alternately and intermittently outputting therefrom a gas at a frequency of 200 to 5000 cycles per minute, said first and second outlet ports being connected to said first and second injection tubes, respectively, so that said gas outputted from the ventilation means is transformed into a jet stream which causes said respiration gas, introduced into said endotracheal cannula through said inner tube, to oscillate.