PROBLEM TO BE SOLVED: To provide an oxygen mask that can measure the concentration of exhaled gas exactly by reducing the dilution of the exhaled gas by oxygen.SOLUTION: The oxygen mask includes an oxygen supply part and a patient wearing part which is worn around the nose or around the nose and mouth of a patient. The patient wearing part includes an opening which communicates with the outside air. When the oxygen mask is worn by the patient, the opening is formed in the position where the opening faces at least one of the nose and mouth of the patient.COPYRIGHT: (C)2014,JPO&INPIT【課題】呼気ガスが酸素で希釈されるのを少なくして、呼気ガス濃度の正確な測定が可能な酸素マスクを提供する。【解決手段】 酸素供給部と患者の鼻又は鼻及び口の外周に装着される患者装着部とよりなる酸素マスクであって、前記患者装着部には外気と連通する開口部を備え、患者に酸素マスクを装着した際に、前記開口部は当該患者の鼻と口の少なくとも1方が対向する位置に形成されることを特徴とする。【選択図】 図1
