Source:http://linkedlifedata.com/resource/umls/id/C0024861
MSH: Devices that cover the nose and mouth to maintain aseptic conditions or to administer inhaled anesthetics or other gases. (UMDNS, 1999),UMD: Devices that cover the nose and mouth to maintain aseptic conditions or to administer inhaled anesthetics or other gases. They are typically composed of rubber, plastic or paper products.,NCI: A protective covering worn over the face, or an apparatus for administering anesthesia or oxygen through the nose or mouth.