Cushion for a respiratory mask assembly

• US 7,958,893 B2
• Filed: 03/18/2009
• Issued: 06/14/2011
• Est. Priority Date: 09/07/2001
• Status: Expired due to Fees

• Current Assignee: ResMed Pty Ltd. (ResMed Incorporated)
• Original Assignee: Resmed Limited (ResMed Incorporated)
• Inventors: Frater, Robert Henry, Guney, Memduh, Lithgow, Perry David, Drew, Joanne Elizabeth, Kwok, Philip Rodney, Fu, Timothy Tsun-Fai
• Primary Examiner(s): Douglas; Steven O
• Application Number:
  US12/382,517
• Publication Number:
  US 20090178679A1
• Time in Patent Office: 818 Days
• Field of Search: 128/205.25, 12820122-20124, 128/201.29, 128/206.21, 128/206.24, 128/206.26, 128/206.28, 128/207.11, 128/207.13
• US Class Current: 128/206.24
• CPC Class Codes: A61M 16/06 Respiratory or anaesthetic masks
• CPC Class Codes: A61M 16/0611 with a gusset portion
• CPC Class Codes: A61M 16/0616 with face sealing means comprising a flap or membrane projecting inwards, such that sealing increases with increasing inhalation gas pressure
• CPC Class Codes: A61M 16/0622 having an underlying cushion
• CPC Class Codes: A61M 16/0633 with forehead support
• CPC Class Codes: A61M 16/0638 in the form of a pivot
• CPC Class Codes: A61M 16/0683 Holding devices therefor
• CPC Class Codes: A61M 16/08 Bellows; Connecting tubes having means for taking samples G01N1/22; Water traps; Patient circuits
• CPC Class Codes: A61M 16/0825 with ball-sockets
• CPC Class Codes: Y10T 29/4987 Elastic joining of parts

Abstract

A respiratory mask includes a frame including a breathable gas port, wherein the frame defines an inner chamber to receive at least one of a wearer'"'"'s nasal region and mouth. The mask includes a cushion including a flange connected to the frame, an inner rim defining an opening to the inner chamber of the frame, and a sealing portion disposed between the flange and the inner rim to contact the wearer'"'"'s face. The sealing portion includes a nasal seal section to span a wearer'"'"'s face above the wearer'"'"'s nares, side seal sections extending from each side of the nasal seal section on both sides of the wearer'"'"'s mouth, and a chin seal section that extends between the side seal sections. The chin seal section is upwardly curved in an arch to follow the chin'"'"'s bony contour.

Claims

1. A respiratory mask assembly for delivering breathable gas to a patient, comprising:

a frame; and

a cushion having a non-face contacting portion connected to the frame, a face-contacting portion structured to apply a contact force on the patient'"'"'s face, and an intermediate portion that interconnects the non-face contacting portion and the face-contacting portion,

wherein the intermediate portion includes an elastic cuff portion that is at least partly determinative of a component of the contact force to be applied to the patient'"'"'s face through the face-contacting portion, the elastic cuff portion having a stiffness which is less than a stiffness of at least one of the face contacting portion and the non-face contacting portion.

2. A cushion comprising:

a non-face contacting portion adapted to be connected to a frame;

a face-contacting portion structured to apply a contact force on the patient'"'"'s face; and

an intermediate portion that interconnects the non-face contacting portion and the face contacting portion, the intermediate portion including at least one elastic cuff portion that is at least partly determinative of a component of the contact force to be applied to the patient'"'"'s face through the face-contacting portion, the at least one elastic cuff portion having a stiffness which is less than a stiffness of at least one of the face contacting portion and the non-face contacting portion.

3. The cushion of claim 2, wherein the at least one elastic cuff portion extends about the entire perimeter of the cushion.

4. The cushion of claim 2, wherein the at least one elastic cuff portion is provided along only a limited portion of the intermediate portion of the cushion.

5. The cushion of claim 4, wherein the cushion includes a base portion and an obliquely angled side portion provided to each side of the base portion, and the at least one elastic cuff portion is provided along the base portion.

6. The cushion of claim 4, wherein the at least one elastic cuff portion includes two elastic cuff portions provided symmetrically about the intermediate portion.

7. The cushion of claim 2, wherein the face-contacting portion includes a side wall, a rim extending away from the side wall, and a membrane to substantially surround the rim.

8. The cushion of claim 2, wherein the at least one elastic cuff portion is fillable with a compressible or non-compressible fluid, or some combination thereof.

9. The cushion of claim 8, wherein the fluid includes air, flowable liquid, flowable gel, and/or semi-flowable gel.

10. The cushion of claim 8, wherein the at least one elastic cuff portion is resiliently inflatable by a source of pressurized gas.

11. The cushion of claim 10, wherein the source is the same source structured to provide pressurized breathable gas to a breathing chamber of the cushion.

12. The cushion of claim 10, wherein the source is independent of a source structured to provide pressurized breathable gas to a breathing chamber of the cushion.

13. The cushion of claim 2, wherein the at least one elastic cuff portion is formed in one piece with the non-face contacting, face-contacting, and intermediate portions of the cushion.

14. The cushion of claim 2, wherein the at least one elastic cuff portion is constructed from a material having a modulus of elasticity in the range of about 0.15 MPa to 0.6 MPa.

15. The cushion of claim 2, wherein the cushion includes a nasal cushion adapted to seal along nasal bridge, cheek, and upper lip regions of the patient'"'"'s face.

16. The cushion of claim 2, wherein the at least one elastic cuff portion includes resiliently expandable and stretchable walls.

17. The cushion of claim 2, wherein the contact force can be tuned by adjusting a modulus of elasticity, a geometry or shape, a material, and/or an initial mass of fluid before fitting of the at least one elastic cuff portion.

18. The cushion of claim 2, wherein the at least one elastic cuff portion is pressurizable with a manual pump.

19. The cushion of claim 2, wherein the at least one elastic cuff portion is constructed of a latex balloon material or a silicone rubber.

20. A respiratory mask assembly for delivering breathable gas to a patient, comprising:

a frame; and

a cushion having a non-face contacting portion connected to the frame, a face-contacting portion structured to apply a contact force on the patient'"'"'s face, and an intermediate portion that interconnects the non-face contacting portion and the face-contacting portion,

wherein the intermediate portion includes an elastic cuff portion that is at least partly determinative of a component of the contact force to be applied to the patient'"'"'s face through the face-contacting portion, the elastic cuff portion including resiliently expandable and stretchable walls constructed from a material having a modulus of elasticity in the range of about 0.15 MPa to 0.6 MPa.