Respiratory mask with an air-impermeable shield

摘要

A respiratory mask includes a shield and a mask body. The shield includes an air-impermeable bent sheet that defines a rim-receiving recess. The mask body is detachably connected to the shield and includes a rim that is received in the rim-receiving recess and that defines a chamber therein. The shield cooperates with the mask body to define a gap therebetween. The rim is formed with at least an aperture that is in spatial communication with the chamber and the gap. A filter sheet is permeable to air and is attached to the rim to cover the aperture.