A horizontal flat-fold, filtering face-piece respirator 10 that includes a harness 14 and a mask body 12 that has a front surface, a first perimeter 24a, and a longitudinal axis 34. A nose clip 30 is secured to the mask body 12 centrally and adjacent to the first perimeter 24a of the mask body 12. An indicia 32 that is visible on the front surface of the mask body 12 in a vicinity of the nose clip 30 is provided to highlight a longitudinal axis of symmetry of the nose clip. The use of such an indicia, visible from the mask body front surface, enables a user to readily identify where the nose clip may be bent to prepare it for donning by the wearer.

A breathing filter assembly for filtering breathing air includes a breathing unit that includes a mouthpiece that can be placed in a user's mouth. The breathing unit includes a pair of nose tubes that can each be positioned in a respective one of the user's nostrils when the mouthpiece is positioned in the user's mouth. A filter is removably insertable into the breathing unit. The filter is made of an air permeable material to pass air therethrough for breathing. The filter extends into the mouthpiece and each of the nose tubes to filter air inhaled through the user's mouth or the user's nose.

A dental appliance apparatus is disclosed herein. In various aspects, the dental appliance may include a body removably attachable to one or more teeth selected from premolars and molars, and a flange extending forth from lingual portions of the body to contact a tongue at one or more locations proximate the premolars and the molars in order to cause a contraction of the genioglossus that positions the tongue anteriorly and downward toward the mandible by stimulation of the hypoglossal nerve. The dental appliance may include a connector connected to the body, and the connector may pass about buccal-labial sides of the anterior teeth. A bumper may be included on a labial side of the connector, and the bumper may contact the lips to promote pursed lips breathing. An anterior flange may extend lingually from the connector to stimulate the hypoglossal nerve proximate a tip of the tongue in order to cause contraction of the genioglossus to position the tongue anteriorly and downward toward the mandible.

A dental appliance apparatus is disclosed herein. In various aspects, the dental appliance may include a body removably attachable to one or more teeth selected from premolars and molars, and a flange extending forth from lingual portions of the body to contact a tongue at one or more locations proximate the premolars and the molars in order to cause a contraction of the genioglossus that positions the tongue anteriorly and downward toward the mandible by stimulation of the hypoglossal nerve. The dental appliance may include a connector connected to the body, and the connector may pass about buccal-labial sides of the anterior teeth. A bumper may be included on a labial side of the connector, and the bumper may contact the lips to promote pursed lips breathing. An anterior flange may extend lingually from the connector to stimulate the hypoglossal nerve proximate a tip of the tongue in order to cause contraction of the genioglossus to position the tongue anteriorly and downward toward the mandible.

Systems and methods for emergency breathing systems in accordance with embodiments of the invention are disclosed. In an embodiment, a second stage regulator includes a housing, a first nosepiece coupled to a first lever, a second nosepiece coupled to a second lever, a first spring located in the housing and coupled to the first nosepiece and the first lever, a second spring located in the housing and coupled to the second nosepiece and the second lever, a mouthpiece, and a coupler coupled to the housing, wherein the first spring and the second spring bias the first nosepiece and the second nosepiece towards each other.

Systems and methods for emergency breathing systems in accordance with embodiments of the invention are disclosed. In an embodiment, a second stage regulator includes a housing, a first nosepiece coupled to a first lever, a second nosepiece coupled to a second lever, a first spring located in the housing and coupled to the first nosepiece and the first lever, a second spring located in the housing and coupled to the second nosepiece and the second lever, a mouthpiece, and a coupler coupled to the housing, wherein the first spring and the second spring bias the first nosepiece and the second nosepiece towards each other.

An apparatus that stores air for underwater use in an emergency. The device includes an air and water impermeable reservoir having reinforcing ribs each with a hole to allow air flow within the reservoir. The reservoir is filled with air through a mouthpiece via an air pump. The mouthpiece is fluidly connected to the reservoir with an air transfer channel to allow a user to take several breaths of air when underwater.

A mouth seal assembly for use with a nasal mask system includes a mouth seal adapted to form a seal with the patient's mouth. The mouth seal is substantially independent from a supply of pressurized air from the nasal mask system. An anti-asphyxia valve may be provided to either the mouth seal over the patient's lips or the nasal mask system. A strap arrangement may support the mouth seal in a desired position on the patient's face in use.

A mask apparatus includes a mask body and a mask body cover coupled to the mask body. The mask body includes a front surface, a rear surface, and a pair of air ducts disposed at left and right sides of the front surface. The mask body is configured to mount a pair of fan modules at suction sides of the pair of air ducts. The mask body cover covers the pair of air ducts and the pair of fan modules. The mask body defines a cover coupling groove along an edge of the mask body, and the cover coupling groove is coupled to an edge of the mask body cover.

A mask apparatus includes a mask body and a mask body cover coupled to the mask body. The mask body includes a front surface, a rear surface, and a pair of air ducts disposed at left and right sides of the front surface. The mask body is configured to mount a pair of fan modules at suction sides of the pair of air ducts. The mask body cover covers the pair of air ducts and the pair of fan modules. The mask body defines a cover coupling groove along an edge of the mask body, and the cover coupling groove is coupled to an edge of the mask body cover.