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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0964280 (2013-08-12) |
등록번호 | US-9757533 (2017-09-12) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 6 인용 특허 : 611 |
A full-face mask system for delivery of a supply of gas at positive pressure to a patient for medical treatment includes a shroud, a cushion module adapted to form a seal with the patient's nose and mouth, an elbow, and headgear. The cushion module includes a frame and a cushion. The frame includes
A full-face mask system for delivery of a supply of gas at positive pressure to a patient for medical treatment includes a shroud, a cushion module adapted to form a seal with the patient's nose and mouth, an elbow, and headgear. The cushion module includes a frame and a cushion. The frame includes an opening that releasably receives a distal end of the elbow with a snap-fit, wherein an inner edge of the opening and the distal end of the elbow together form a retention structure to retain the elbow to the frame.
1. A mask system to provide positive air pressure therapy to a patient, the mask system comprising: a cushion module comprising: a frame having an internal surface forming a breathing chamber, the frame including a circular frame opening positioned to receive a supply of air at positive pressure, th
1. A mask system to provide positive air pressure therapy to a patient, the mask system comprising: a cushion module comprising: a frame having an internal surface forming a breathing chamber, the frame including a circular frame opening positioned to receive a supply of air at positive pressure, the frame including a cylindrical collar, the collar surrounding said frame opening, the collar projecting from an external surface of the frame in a direction away from the breathing chamber, the collar having a longitudinal axis, the collar having a cylindrical surface and a plurality of protrusions that protrude radially relative to the cylindrical surface, and the protrusions being spaced from one another about the circumference of the cylindrical surface of the collar, wherein the frame, including the cylindrical collar and the plurality of protrusions, is constructed of a first material,a cushion constructed of an elastomeric material that is a different material from the first material, the first material being harder than the elastomeric material of the cushion, the frame being more rigid than the cushion, the cushion configured to seal against the patient's face in use to enable the supply of air at positive pressure to be delivered to at least the patient's nose, anda protruding vent arrangement having a plurality of holes for gas washout from the breathing chamber to atmosphere, the protruding vent arrangement including a vent-wall having the plurality of holes, the vent-wall being spaced from an adjacent portion of the frame by a lower wall and two lateral side walls of the protruding vent arrangement, and the protruding vent arrangement positioned above the frame opening,wherein the cushion and the frame are joined to form a one-piece, integrated component;headgear configured to maintain the cushion module in position on the patient's head in use;an elbow configured to receive the supply of air at positive pressure and deliver the supply of air at positive pressure to the breathing chamber; anda shroud removably connected to the cushion module, the shroud having a vent-receiving opening that receives the protruding vent arrangement, wherein the shroud includes a circular elbow opening that accommodates the elbow, wherein the shroud includes a rear surface that at least partly covers the external surface of the frame of the cushion module and the shroud includes a plurality of snap fingers, the plurality of snap fingers being circumferentially spaced about the elbow opening, and the plurality of snap fingers projecting from the rear surface of the shroud in a direction towards the breathing chamber, wherein the shroud, including the plurality of snap fingers, is constructed of a second material, the second material of the shroud being harder than the elastomeric material of the cushion, the shroud being more rigid than the cushion, and wherein the shroud includes a pair of upper headgear connectors and a pair of lower headgear connectors, said pair of upper headgear connectors structured to connect to said headgear, and said pair of lower headgear connectors structured to connect to said headgear via clips,wherein, to removably connect the shroud and the cushion module, the plurality of snap fingers are structured to resiliently deflect in a radial direction relative to the longitudinal axis of the collar to form a removable snap-fit connection with corresponding ones of the plurality of protrusions of the collar by moving the cushion module and the shroud towards one another along the longitudinal axis of the collar. 2. The mask system of claim 1, wherein the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and a lower lip/chin region of the patient's face when in use, and wherein the elbow includes an anti-asphyxia valve. 3. The mask system of claim 1, wherein the elastomeric material of the cushion is silicone. 4. The mask system of claim 1, wherein the cushion and the frame are constructed and arranged to be in an interlocking relationship with one another. 5. The mask system of claim 1, wherein the cushion includes notches and/or protrusions to engage with complementary features in the frame. 6. The mask system of claim 1, wherein the first material is polycarbonate. 7. The mask system of claim 1, wherein the shroud comprises a forehead support. 8. The mask system of claim 1, wherein: the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and a lower lip/chin region of the patient's face when in use,the elastomeric material of the cushion is silicone,the cushion and the frame are constructed and arranged to be in an interlocking relationship with one another,the first material is polycarbonate,the second material is polycarbonate,said headgear comprises hook and loop material,the shroud further comprises a forehead support,the elbow includes an anti-asphyxia valve,the elbow and the shroud are configured to be directly connected to one another,each of the plurality of snap fingers and each of the plurality of protrusions have a part-annular shape that is curved relative to the longitudinal axis of the collar,a region of the cushion positioned to engage the nasal bridge region of the patient is configured to allow increased movement compared to another region of the cushion that is adapted to seal with another region of the patient's face, andthe mask system being constructed so that the snap-fit connection is established when a force is applied to move the shroud and cushion module toward one another along the longitudinal axis until a ramped rear end of each of the snap fingers initially contacts a front end of the corresponding protrusion on the collar, whereupon further application of the force causes each of the snap fingers to ride over the corresponding protrusion and therefore resiliently deflect in a first radial direction, and upon further movement towards one another, each of the snap fingers resiliently moves in a second radial direction, opposite the first radial direction, and engages a rear end of the corresponding protrusion to snap each of the snap fingers into place, thereby removably connecting the shroud and the cushion module. 9. The mask system of claim 8, the cushion further comprising a fold configured to deform at the nasal bridge region of the patient in use. 10. The mask system of claim 8, wherein the elbow is attached to the shroud with a mechanical interlock. 11. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 8;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 12. The mask system of claim 1, wherein the vent-receiving opening is bounded by a rim of the shroud, wherein the rim lies proximate the two lateral side walls and the lower wall of the vent-wall of the protruding vent arrangement when the shroud is snap-fit connected to the cushion module such that the protruding vent arrangement partly interlocks the frame and the shroud, and wherein the vent-wall is substantially flush with a portion of the shroud surrounding the rim. 13. The mask system of claim 1, wherein the vent-wall is oriented at an angle relative to the frame opening such that a longitudinal axis of each of the plurality of holes and the longitudinal axis of the collar are not parallel. 14. The mask system of claim 1, wherein the plurality of snap fingers are structured to form the removable snap-fit connection with corresponding ones of the plurality of protrusions between a front end of the cylindrical surface and a rear end of the cylindrical surface. 15. The mask system of claim 1, wherein the elbow is sealingly attached to the shroud at the elbow opening. 16. The mask system of claim 15, wherein the elbow is rotatable 360° relative to the shroud. 17. The mask system of claim 15, further comprising a sealing element positioned between the elbow and the shroud. 18. A system for treating sleep disordered breathing, comprising: the mask system of claim 1;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 19. A mask system to provide positive air pressure therapy to a patient, the mask system comprising: a cushion module comprising: a frame constructed of a first material, the frame having an interior surface forming a breathing chamber, the frame including a circular frame opening positioned to receive a supply of air at positive pressure,a cushion constructed of an elastomeric material that is a different material from the first material, the first material of the frame being harder than the elastomeric material of the cushion, the frame being more rigid than the cushion, the cushion configured to seal against the patient's face in use to enable the supply of air at positive pressure to be delivered to at least the patient's nose, anda vent arrangement having a plurality of holes for gas washout from the breathing chamber to atmosphere, the plurality of holes being formed in a vent-wall of the frame, the vent-wall protruding outwardly from an adjacent portion of the frame, and the vent arrangement positioned above the frame opening,wherein the cushion and the frame joined to form a one-piece, integrated component;headgear configured to maintain the mask system in position on the patient's head in use;a shroud to removably retain the frame, the shroud at least partly covering an exterior surface of the frame, the shroud constructed of a second material, the second material of the shroud being harder than the elastomeric material of the cushion, the shroud being more rigid than the cushion, and the shroud including headgear connectors structured to connect to said headgear; andan elbow configured to receive the supply of air at positive pressure and deliver the supply of air at positive pressure to the frame opening,wherein the shroud includes a vent-receiving opening that receives said vent arrangement, and wherein the shroud includes a circular elbow opening that accommodates the elbow, andwherein the shroud includes a plurality of snap fingers adjacent to the elbow opening,wherein the frame further comprises part-annular protrusions to engage corresponding ones of the plurality of snap fingers with a snap-fit. 20. The mask system of claim 19, wherein the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and a lower lip/chin region of the patient's face when in use, and wherein the elbow includes an anti-asphyxia valve. 21. The mask system of claim 19, wherein the elastomeric material is silicone. 22. The mask system of claim 19, wherein the cushion and the frame are constructed and arranged to be in an interlocking relationship with one another. 23. The mask system of claim 19, wherein the cushion includes notches and/or protrusions to engage with complementary features in the frame. 24. The mask system of claim 19, wherein the first material is polycarbonate. 25. The mask system of claim 19, wherein the shroud comprises a forehead support. 26. The mask system of claim 19, wherein: the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and a lower lip/chin region of the patient's face when in use,the elastomeric material of the cushion is silicone,the cushion and the frame are constructed and arranged to be in an interlocking relationship with one another,the first material is polycarbonate,the second material is polycarbonate,said headgear comprises hook and loop material,the shroud further comprises a forehead support,the elbow and the shroud are configured to be directly connected to one another,a region of the cushion positioned to engage the nasal bridge region of the patient is configured to allow increased movement compared to another region of the cushion that is adapted to seal with another region of the patient's face,the part-annular protrusions are spaced circumferentially around the frame opening, andthe elbow includes an anti-asphyxia valve. 27. The mask system of claim 19, wherein the vent-wall is oriented at an angle relative to the frame opening such that a longitudinal axis of each of the plurality of holes and the longitudinal axis of the collar are not parallel. 28. The mask system of claim 19, wherein the elbow is directly attached to the shroud at the elbow opening. 29. The mask system of claim 28, wherein the elbow is rotatable 360° relative to the shroud. 30. The mask system of claim 29, wherein the elbow is attached to the shroud with a mechanical interlock. 31. The mask system of claim 28, wherein the elbow and the shroud are structured to form a seal therebetween. 32. A system for treating sleep disordered breathing, comprising: the mask system of claim 19;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 33. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 26;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 34. A mask system to provide positive air pressure therapy to a patient, the mask system comprising: a cushion module comprising: a frame constructed of a first material, the frame having an interior surface forming a breathing chamber, the frame including a protruding vent arrangement for gas washout from the breathing chamber to atmosphere, the protruding vent arrangement having a plurality of vent holes, the frame including a circular frame opening configured to, in use, receive a supply of air at positive pressure, anda cushion constructed of an elastomeric material that is a different material from the first material of the frame, the first material of the frame being harder than the elastomeric material of the cushion, the frame being more rigid than the cushion, the cushion configured to seal against the patient's face in use to enable the supply of air at positive pressure to be delivered to the patient's airways, and wherein the cushion is connected to the frame;a shroud structured to removably retain the frame of the cushion module, the shroud having a rear wall that at least partly covers an exterior surface of the frame, the shroud constructed of a second material, the second material of the shroud being harder than the elastomeric material of the cushion, the shroud being more rigid than the cushion, wherein the shroud includes a vent-receiving opening that receives said protruding vent arrangement; andheadgear configured to maintain the mask system in position on the patient's head in use, the headgear connected to the shroud,wherein the frame includes a cylindrical collar extending from the exterior surface of the frame in a direction away from the breathing chamber, the collar having a longitudinal axis, andwherein the shroud includes a plurality of snap fingers projecting from the rear wall towards the breathing chamber, and the collar further comprises pan-annular protrusions to engage corresponding ones of the plurality of snap fingers with a removable snap-fit connection by moving the cushion module and the shroud towards one another along the longitudinal axis of the collar. 35. The mask system of claim 34, wherein the shroud further comprises a pair of upper headgear connectors and a pair of lower headgear connectors. 36. The mask system of claim 34, wherein the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and a lower lip or chin region when in use. 37. The mask system of claim 36, comprising an anti-asphyxia valve. 38. The mask system of claim 37, wherein the anti-asphyxia valve comprises a port and a flap portion to selectively close said port. 39. The mask system of claim 38, wherein the anti-asphyxia valve comprises a clip portion that is configured to attach the anti-asphyxia valve to an elbow. 40. The mask system of claim 34, wherein the elastomeric material is silicone. 41. The mask system of claim 34, wherein the cushion and the frame are connected in an interlocking relationship. 42. The mask system of claim 34, wherein the cushion includes notches and/or protrusions to engage with complementary features in the frame. 43. The mask system of claim 34, wherein the first material is polycarbonate. 44. The mask system of claim 34, further comprising headgear connectors to attach the headgear to said shroud. 45. The mask system of claim 44, wherein the headgear is removably attached to the shroud. 46. The mask system of claim 34, wherein said shroud further comprises a forehead support. 47. The mask system of claim 34, wherein the shroud includes a circular elbow opening that accommodates the elbow, and wherein the mask system further comprises an elbow having an interfacing structure configured to 1) interface with the elbow opening or 2) attach the elbow in the elbow opening. 48. The mask system of claim 47, wherein the elbow is rotatable or swivelable. 49. The mask system of claim 47, wherein the elbow is rotatable or swivelable through 360°. 50. The mask system of claim 47, wherein the elbow comprises a first end, a second end, and a swivel joint provided to the second end that is adapted to be connected to an air delivery tube. 51. The mask system of claim 34, further comprising an elbow configured to receive the supply of air at positive pressure and deliver the supply of air at positive pressure to the frame opening, wherein:the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and a lower lip/chin region of the patient's face when in use,the elastomeric material of the cushion is silicone,the cushion and the frame are constructed and arranged to be in an interlocking relationship with one another,the first material is polycarbonate,the second material is polycarbonate,said headgear comprises hook and loop material,the shroud further comprises a forehead support,the elbow and the shroud are configured to be directly connected to one another,a region of the cushion positioned to engage the nasal bridge region of the patient is configured to allow increased movement compared to another region of the cushion that is adapted to seal with another region of the patient's face,the part-annular protrusions are spaced circumferentially around the frame opening, andthe elbow includes an anti-asphyxia valve. 52. The mask system of claim 34, wherein the plurality of snap fingers are structured to form the removable snap-fit connection with the collar between a front end of the collar and a rear end of the collar. 53. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 34;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 54. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 51;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 55. A mask system to provide positive air pressure therapy to a patient, the mask system comprising: a cushion module comprising: a frame having an interior surface forming a breathing chamber, the frame including a circular frame opening positioned to receive a supply of air at positive pressure, wherein the frame includes a cylindrical collar surrounding the frame opening and extending away from an exterior surface of the frame, the collar having a longitudinal axis, and the collar having a cylindrical surface with an axis that is coincident with the longitudinal axis of the collar, wherein the collar includes at least one radial protrusion extending from the cylindrical surface, the at least one radial protrusion having a curvature centered about the longitudinal axis of the collar, wherein the frame, including the collar and the at least one radial protrusion, is constructed from a first material, anda cushion constructed of an elastomeric material that is a different material from the first material, the first material of the frame being harder than the elastomeric material of the cushion, the frame being more rigid than the cushion, the cushion configured to seal against the patient's face in use to enable the supply of air at positive pressure to be delivered to at least the patient's nose,wherein the cushion and the frame are joined to form a one-piece, integrated component;an elbow configured to receive the supply of air at positive pressure and deliver the supply of air at positive pressure to the breathing chamber;a shroud configured to removably connect to the frame of the cushion module, wherein the shroud includes a circular elbow opening that accommodates the elbow, wherein the shroud includes a rear surface at least partly covering the exterior surface of the frame, the shroud having a plurality of part-annular snap connection portions circumferentially spaced from one another and centered about a longitudinal axis of the elbow opening, the snap connection portions being positioned rearward of the elbow opening of the shroud, wherein the shroud, including the snap connection portions, is constructed from a second material, the second material of the shroud being harrier than the elastomeric material of the cushion, and the shroud being more rigid than the cushion,headgear configured to connect to the shroud to maintain the cushion module in position on the patient's head in use; anda vent arrangement having a plurality of holes for gas washout from the breathing chamber to atmosphere,wherein the shroud includes a pair of upper headgear connectors and a pair of lower headgear connectors, said pair of upper headgear connectors structured to connect to said headgear, and said pair of lower headgear connectors structured to connect to said headgear via clips,wherein, to releasably connect the shroud to the cushion module, the at least one radial protrusion and the snap connection portions are structured to resiliently deflect relative to one another in a radial direction relative to the longitudinal axis of the collar to form a removable snap-fit connection between the at least one radial protrusion and the snap connection portions by moving the cushion module and the shroud towards one another along the longitudinal axis of the collar, andwherein when the collar and the snap connection portions are joined to form the removable snap-fit connection, the cushion module and the shroud are stabilized against rotation relative to one another. 56. The mask system of claim 55, wherein: the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and a lower lip/chin region of the patient's face when in use,the elastomeric material of the cushion is silicone,the shroud does not include a forehead support,the elbow includes an anti-asphyxia valve,the first material is polycarbonate,the second material is polycarbonate,the elbow is directly attached to the shroud at the elbow opening,the elbow is rotatable 360° relative to the shroud,the at least one radial protrusion further comprising a single radial protrusion having an annular shape,the single radial protrusion and the snap connection portions are arranged to remain stationary relative to one another as the elbow is rotated,the cushion and the frame are joined by a chemical bond,the headgear comprises a pair of upper straps, each of the pair of upper straps configured to be positioned on a corresponding lateral side of the patient's head in use, and a pair of lower straps, each of the pair of lower straps configured to be positioned on a corresponding lateral side of the patient's head in use,each of the pair of upper headgear connectors comprises an elongated arm to direct a corresponding one of the pair of upper straps away from the patient's corresponding eye, each elongated arm being shaped to follow contours of the patient's face and avoid the patient's line of sight in use,a portion of each elongated arm is enveloped by a fabric sleeve,each elongated arm is constructed of a flexible material,each elongated arm is connected to the shroud,each elongated arm is configured to be positioned inferior to the patient's corresponding eye in use and is configured to direct a corresponding one of the pair of upper straps superior to the patient's corresponding ear in use, andeach of the pair of lower headgear connectors is configured to direct a corresponding one of the pair of lower straps inferior to the patient's corresponding ear in use. 57. The mask system of claim 55, wherein: the cylindrical surface is on an exterior of the collar,the at least one radial protrusion comprises a plurality of protrusions spaced circumferentially about the cylindrical surface, each of the plurality of protrusions having a part-annular shape,the protrusions and the snap connection portions are configured to form the removable snap-fit connection between a front end of the cylindrical surface and a rear end of the cylindrical surface,the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and an upper lip region of the patient's face when in use,the elastomeric material of the cushion is silicone,the shroud does not include a forehead support,the first material is polycarbonate,the second material is polycarbonate,the cushion and the frame are joined by a chemical bond,the elbow is directly attached to the shroud at the elbow opening,the elbow is rotatable 360° relative to the shroud,the collar and the snap-fit connection are arranged to remain stationary relative to one another as the elbow is rotated,the headgear comprises a pair of upper straps, each of the pair of upper straps configured to be positioned on a corresponding lateral side of the patient's head in use, and a pair of lower straps, each of the pair of lower straps configured to be positioned on a corresponding lateral side of the patient's head in use,each of the pair of upper headgear connectors comprises an elongated arm to direct a corresponding one of the pair of upper straps away from the patient's corresponding eye, each elongated arm being shaped to follow contours of the patient's face and avoid the patient's line of sight in use,each elongated arm has an inner surface including a cheek pad,each elongated arm is constructed of a flexible material,each elongated arm is configured to be positioned inferior to the patient's corresponding eye in use and is configured to direct a corresponding one of the pair of upper straps superior to the patient's corresponding ear in use,each of the pair of lower headgear connectors is configured to direct a corresponding one of the pair of lower straps inferior to the patient's corresponding ear in use, andthe mask system further includes a seal at an interface between the elbow and the frame. 58. The mask system of claim 55, wherein: the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and a lower lip/chin region of the patient's face when in use,the elastomeric material of the cushion is silicone,the cushion and the frame are constructed and arranged to be in an interlocking relationship with one another,the first material is polycarbonate,the second material is polycarbonate,said headgear comprises hook and loop material,the shroud further comprises a forehead support,the elbow is directly attached to the shroud at the elbow opening,the elbow includes an anti-asphyxia valve,the collar and the snap-fit connection are arranged to remain stationary relative to one another as the elbow is rotated,the vent arrangement comprises a protruding vent arrangement that protrudes from the frame, the protruding vent arrangement including a vent-wall having the plurality of holes, the vent-wall being spaced from the frame by a lower wall and two lateral side walls of the protruding vent arrangement, and the protruding vent arrangement positioned above the frame opening,the at least one radial protrusion further comprises a plurality of part-annular protrusions spaced circumferentially about the frame opening,the snap connection portions comprise part-annular snap fingers that extend from the rear surface and are spaced circumferentially about the elbow opening,the part-annular protrusions and the part-annular snap fingers are configured to form the removable snap-fit connection between a front end of the cylindrical surface and a rear end of the cylindrical surface relative to the patient in use,each of the part-annular snap fingers has a curvature that is centered on the longitudinal axis of the collar,a region of the cushion positioned to engage the nasal bridge region of the patient is configured to allow increased movement compared to another region of the cushion that is adapted to seal with another region of the patient's face, andthe mask system being constructed so that the snap-fit connection is established when a force is applied to move the shroud and cushion module toward one another along the longitudinal axis until a ramped rear end of each of the part-annular snap fingers initially contacts a front end of the corresponding protrusion on the collar, whereupon further application of the force causes each of the part-annular snap fingers to ride over the corresponding part-annular protrusion and therefore resiliently deflect in a first radial direction, and upon further movement towards one another, each of the part-annular snap fingers resiliently moves in a second radial direction, opposite the first radial direction, and engages a rear end of the corresponding part-annular protrusion to snap each of the part-annular snap fingers into place, thereby removably connecting the shroud and the cushion module. 59. The mask system of claim 55, wherein: the at least one radial protrusion further comprises two part-annular protrusions spaced circumferentially about the cylindrical surface,the cushion is constructed to engage the patient's face along a nasal bridge region, a cheek region, and an upper lip region of the patient's face when in use,the elastomeric material of the cushion is silicone,the shroud includes a forehead support,the first material is polycarbonate,the second material is polycarbonate,the elbow is directly attached to the shroud at the elbow opening,the elbow is rotatable 360° relative to the shroud,the collar and the snap-fit connection are arranged to remain stationary relative to one another as the elbow is rotated,the headgear comprises a pair of upper straps, each of the pair of upper straps configured to be positioned on a corresponding lateral side of the patient's head in use, and a pair of lower straps, each of the pair of lower straps configured to be positioned on a corresponding lateral side of the patient's head in use,each of the pair of upper headgear connectors is configured to direct a corresponding one of the pair of upper straps superior to the patient's corresponding ear in use, andeach of the pair of lower headgear connectors is configured to direct a corresponding one of the pair of lower straps inferior to the patient's corresponding ear in use. 60. The mask system of claim 59, further comprising at least one tab and recess arrangement positioned circumferentially between mating ones of the snap connection portions and protrusions, the tab and recess arrangement resisting rotation of the collar relative to the shroud upon establishing the snap-fit connection between the shroud and the cushion module. 61. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 55;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 62. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 56;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 63. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 57;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 64. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 58;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system. 65. A system for treating a patient with sleep disordered breathing, comprising: the mask system of claim 59;a flow generator to generate a supply of air at positive pressure to be delivered to the mask system; andan air delivery tube configured to deliver the supply of air from the flow generator to the mask system.
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