Provided are reusable face masks comprising a single piece mask body configured to cover a nose and a mouth of a human face and comprising at least one filter attachment port, wherein the at least one filter attachment port comprises a coupling mechanism, defines an opening in the mask body, and extends from the exterior surface of the mask body; wherein the coupling mechanism comprises a proximal portion proximate to the exterior surface of the face mask body and a plurality of protrusions extending from the proximal portion and away from the exterior surface of the mask body, wherein the coupling mechanism of the at least one filter attachment port is configured to connect to a replaceable filter. The reusable face mask may comprise a user-facing textured rim configured to come in contact with a user’s face when properly worn by the user.

A patient interface assembly is configured to deliver pressurized respiratory gas to a patient's airways. The patient interface assembly includes a cushion configured to sealingly engage the patient's face, a plenum base supporting the cushion, and a positioning and stabilizing structure configured to support the cushion and the plenum base on the patient's face. The positioning and stabilizing structure includes a stiffened portion. The patient interface assembly further includes a removable sleeve. The stiffened portion of the positioning and stabilizing structure is inserted into the removable sleeve. The removable sleeve is configured to be secured to the stiffened portion of the positioning and stabilizing structure by inserting a projection into a side cutout, and the stiffened portion of the positioning and stabilizing structure is prevented from sliding out of the removable sleeve when the projection is received within the side cutout.

A patient interface assembly is configured to deliver pressurized respiratory gas to a patient's airways. The patient interface assembly includes a cushion configured to sealingly engage the patient's face, a plenum base supporting the cushion, and a positioning and stabilizing structure configured to support the cushion and the plenum base on the patient's face. The positioning and stabilizing structure includes a stiffened portion. The patient interface assembly further includes a removable sleeve. The stiffened portion of the positioning and stabilizing structure is inserted into the removable sleeve. The removable sleeve is configured to be secured to the stiffened portion of the positioning and stabilizing structure by inserting a projection into a side cutout, and the stiffened portion of the positioning and stabilizing structure is prevented from sliding out of the removable sleeve when the projection is received within the side cutout.

A fastening unit, in particular a fastening unit for modules which are intended to supply a user of a breathing mask or breathing hood with breathable air, and to such modules. The fastening unit is designed to secure one module relative to another module, and has a first component part for assembly with the other module and a second component part for assembly with the module. The second component part is rotatable, by means of the first component part, about a predetermined angle relative to the first component part; and first and second subcomponents within the region of the defined angle can engage with each other in a plurality of positions.

A fastening unit, in particular a fastening unit for modules which are intended to supply a user of a breathing mask or breathing hood with breathable air, and to such modules. The fastening unit is designed to secure one module relative to another module, and has a first component part for assembly with the other module and a second component part for assembly with the module. The second component part is rotatable, by means of the first component part, about a predetermined angle relative to the first component part; and first and second subcomponents within the region of the defined angle can engage with each other in a plurality of positions.

A powered air purifying respirator composing 2-channel structure for air support includes: a mask unit that is worn on a face to surround a mouth or nostrils of a user; a generator unit that causes outside air to flow in and supplies the air to the mask unit; and first and second connector units that are formed to provide channels of the air by being connected to the mask unit and the generator unit at both sides of the first and second connectors, where the generator unit includes a fan driving module having first and second air supply holes at both sides of the fan driving module, the first and second air supply holes communicating with end portions of the first and second connector units.

A powered air purifying respirator composing 2-channel structure for air support includes: a mask unit that is worn on a face to surround a mouth or nostrils of a user; a generator unit that causes outside air to flow in and supplies the air to the mask unit; and first and second connector units that are formed to provide channels of the air by being connected to the mask unit and the generator unit at both sides of the first and second connectors, where the generator unit includes a fan driving module having first and second air supply holes at both sides of the fan driving module, the first and second air supply holes communicating with end portions of the first and second connector units.

A respirator (10) having an oral-nasal unit (12) with a peripheral seal that seals around the nose and mouth of a wearer's face and having an inlet aperture (40) connectable to a supply of breathable air, and an outlet aperture (42). The unit having a rigid insert (106) with an exterior profile adapted to seat against a correspondingly shaped interior surface of the unit (12); an outlet conduit (112) with a tube adapted to extend through the exhale aperture (40) of the unit (12); and a wing portion (110) with a through aperture (122) registering with the unit's inlet aperture (40). The outlet conduit (112) having a bayonet connector (130, 132) that enables the unit to interchangeably and detachably connect to, a connector formed as part of an exhale aperture of a full-face mask, or of a harness assembly (102). The bayonet connector forms an airtight seal between the two.

A respirator (10) having an oral-nasal unit (12) with a peripheral seal that seals around the nose and mouth of a wearer's face and having an inlet aperture (40) connectable to a supply of breathable air, and an outlet aperture (42). The unit having a rigid insert (106) with an exterior profile adapted to seat against a correspondingly shaped interior surface of the unit (12); an outlet conduit (112) with a tube adapted to extend through the exhale aperture (40) of the unit (12); and a wing portion (110) with a through aperture (122) registering with the unit's inlet aperture (40). The outlet conduit (112) having a bayonet connector (130, 132) that enables the unit to interchangeably and detachably connect to, a connector formed as part of an exhale aperture of a full-face mask, or of a harness assembly (102). The bayonet connector forms an airtight seal between the two.

A headgear for use with a patient interface for delivering a flow of breathable gas to a patient includes at least a strap adapted to position the patient interface in sealing engagement with the patient’s airways. The strap is constructed from an elastomer and a first side of the strap includes a first region on a portion of its surface that is textured to reduce friction with objects contacting the strap. A textured surface coating for a portion of an elastomer strap included in a headgear system is adapted to contact the skin of a patient, when in use, and the coating has a Ra value greater than zero. A vent for use with a patient interface for delivering a flow of breathable gas to a patient includes a plurality of rises and runs in a stepped arrangement; and a plurality of holes in the stepped arrangement for the venting of gas.