is designed to allow the ends of oxygen outlet port 2 and co 2 sampling inlet port 3 of cannula 1 to rest inside internal gas channel 10 as shown in fig6 oxygen port support 4 and co 2 port support 5 each terminate on their proximal ends in an upward curving quarter circular shaped feature which provides a means for more securely locating near the oral cavity oxygen outlet port 2 of the oxygen delivery system and co 2 sampling inlet port 3 of a capnometry or capnography system oxygen port support 4 and co 2 port support 5 are intended to provide a means for protecting the location of oxygen outlet port 2 and co 2 sampling inlet port 3 against jostling from the movement of the scope the terms u201c oxygen port support u201d and u201c co 2 port support u201d are used only illustratively in this description since the supports are generally symmetrical they could be used interchangeably depending on which side of cannula 1 each port was located an alternate embodiment of the present invention shown in fig7 adds additional functionality by allowing a doctor to insert a finger a short distance into the patient 39 s mouth to help guide the endoscope down into the trachea or esophagus while again preventing excessive jostling of bite block 8 and cannula 1 in the alternate embodiment main body 20 has curved cutouts 23 on its distal end on both of its sides in addition integral to flange 14 and extending out on both of its sides are strap attachment wing extenders 24 each consisting of a thin arced u2018 c u2019 shaped protrusion defining an opening cutouts 23 and strap attachment wing extenders 24 are.