Oro-pillow cushion assembly

Abstract

A patient interface including a seal-forming structure having a mouth portion that forms at least part of the mouth plenum and is configured to seal around the patient's mouth and a nasal portion that is configured to seal with the patient's nares. The patient interface further includes a vent structure with a main body that is configured to be secured to the mouth portion and includes a vent wall with a plurality of vent holes, a receptacle, and a pair of anchor sockets located on opposing lateral sides of the receptacle. A cover for the vent includes a pair of anchor pegs on lateral sides of the cover. The anchor pegs are configured to be inserted into the anchor sockets to secure the cover to the main body. A diffuser is received within the receptacle between the anchor sockets and is sandwiched between the main body and the cover.

1 . A patient interface comprising:
 a mouth plenum pressurisable to a therapeutic pressure of at least 6 cmH 2 O above ambient air pressure, said mouth plenum including a plenum chamber inlet port sized and structured to receive a flow of air at the therapeutic pressure for breathing by a patient,   a seal-forming structure constructed and arranged to form a seal with a region of the patient's face surrounding an entrance to the patient's airways, said seal-forming structure having a hole therein such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the plenum chamber throughout the patient's respiratory cycle in use, the seal-forming structure comprising:
 a mouth portion that forms at least part of the mouth plenum and is configured to seal around the patient's mouth; and 
 a nasal portion that is configured to seal with the patient's nares, the nasal portion comprising a nasal plenum with an inlet opening, the nasal plenum being configured to be received within the receptacle; 
   a positioning and stabilising structure to provide a force to hold the seal-forming structure in a therapeutically effective position on the patient's head; and   a vent structure to allow a continuous flow of gases exhaled by the patient from an interior of the plenum chamber to ambient, said vent structure being sized and shaped to maintain the therapeutic pressure in the plenum chamber in use, the vent structure comprising:
 a main body configured to be secured to the mouth portion, the main body comprising a vent wall with a plurality of vent holes, a receptacle, and a pair of anchor sockets located on opposing lateral sides of the receptacle; 
 a cover comprising a pair of anchor pegs on lateral sides of the cover, the anchor pegs being configured to be inserted into the anchor sockets to secure the cover to the main body; and 
 a diffuser received within the receptacle between the anchor sockets, the diffuser being sandwiched between the main body and the cover, 
   
       wherein
 the patient interface is configured to allow the patient to breathe from ambient through their mouth in the absence of a flow of pressurised air through the plenum chamber inlet port. 
 
     
     
         2 . The patient interface of  claim 1 , wherein the anchor sockets are keyed with the anchor pegs so that only anchor pegs with the same shape as the anchor sockets are receivable within the anchor sockets. 
     
     
         3 . The patient interface of  claim 1 , wherein the anchor sockets are tapered so that the anchor pegs become wedged in the anchor sockets when the cover is secured to the main body. 
     
     
         4 . The patient interface of  claim 1 , wherein the main body comprises a first flange and a second flange that forms a channel with the first flange, wherein the mouth portion comprises a vent opening and a rim of the vent opening is received in the channel when the main body is secured to the mouth portion. 
     
     
         5 . The patient interface of  claim 4 , wherein the anchor sockets extend deeper than the channel. 
     
     
         6 . The patient interface of  claim 1 , wherein the vent wall encloses an end of the receptacle that is closest to the interior of the mouth plenum. 
     
     
         7 . The patient interface of  claim 1 , wherein the diffuser is spaced apart from the vent holes. 
     
     
         8 . The patient interface of  claim 1 , wherein each anchor socket has a different size. 
     
     
         9 . The patient interface of  claim 1 , wherein each anchor socket has a different shape. 
     
     
         10 . The patient interface of  claim 1 , wherein the anchor sockets are configured to prevent the cover from being secured to the main body in the wrong orientation. 
     
     
         11 . The patient interface of  claim 1 , wherein a perimeter of the cover is smaller than a perimeter of the main body so that a gap is formed between the main body and the cover when the cover is secured to the main body. 
     
     
         12 . The patient interface of  claim 1 , wherein the vent holes are tapered so that the vent holes narrow in a direction toward the diffuser. 
     
     
         13 . The patient interface of  claim 12 , wherein opposing sides of the interior wall of each vent hole forms an angle of taper 10 to 35 degrees. 
     
     
         14 . The patient interface of  claim 13 , wherein the angle of taper is about 10 degrees. 
     
     
         15 . The patient interface of  claim 13 , wherein the angle of taper is about 35 degrees. 
     
     
         16 . The patient interface of  claim 1 , wherein a base of each vent hole is flared. 
     
     
         17 . The patient interface of  claim 16 , wherein the flared portion of the vent hole has a radius of curvature of 0.2 mm to 0.4 mm. 
     
     
         18 . The patient interface of  claim 17 , wherein the radius of curvature is about 0.25 mm. 
     
     
         19 . The patient interface of  claim 17 , wherein the radius of curvature is about 0.3 mm. 
     
     
         20 . The patient interface of  claim 1 , wherein a smallest diameter of each vent hole is 0.5 mm to 2.0 mm. 
     
     
         21 . The patient interface of  claim 20 , wherein the smallest diameter is 0.89 mm. 
     
     
         22 . The patient interface of  claim 20 , wherein the smallest diameter is 0.98 mm. 
     
     
         23 . The patient interface of  claim 20 , wherein the smallest diameter is 1.01 mm. 
     
     
         24 . The patient interface of  claim 20 , wherein the smallest diameter is 1.17 mm. 
     
     
         25 . A respiratory therapy system comprising:
 the patient interface of  claim 1 ;   a respiratory pressure therapy device configured to generate the flow of air at the therapeutic pressure; and   an air circuit configured to direct the flow of air at the therapeutic pressure from the respiratory pressure therapy device to the patient interface.   
     
     
         26 . A patient interface comprising:
 a mouth plenum pressurisable to a therapeutic pressure of at least 6 cmH 2 O above ambient air pressure, said mouth plenum including a plenum chamber inlet port sized and structured to receive a flow of air at the therapeutic pressure for breathing by a patient,   a seal-forming structure constructed and arranged to form a seal with a region of the patient's face surrounding an entrance to the patient's airways, said seal-forming structure having a hole therein such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the plenum chamber throughout the patient's respiratory cycle in use, the seal-forming structure comprising:
 a mouth portion that forms at least part of the mouth plenum and is configured to seal around the patient's mouth; and 
 a nasal portion that is configured to seal with the patient's nares, the nasal portion comprising a nasal plenum with an inlet opening, the nasal plenum being configured to be received within the receptacle; 
   a positioning and stabilising structure to provide a force to hold the seal-forming structure in a therapeutically effective position on the patient's head; and   a vent structure to allow a continuous flow of gases exhaled by the patient from an interior of the plenum chamber to ambient, said vent structure being sized and shaped to maintain the therapeutic pressure in the plenum chamber in use, the vent structure comprising:
 a vent wall with a plurality of vent openings and a trough on an outwardly facing surface that completely encircles the vent openings; 
 at least one side wall extending from the vent wall; and 
 a flange extending from an end of the at least one side wall so that an edge of the vent wall, an outer surface of the at least one side wall, and the flange together form a channel configured to receive a rim around the vent opening in the mouth portion, the flange being configured to be received inside the mouth plenum, 
   
       wherein
 the patient interface is configured to allow the patient to breathe from ambient through their mouth in the absence of a flow of pressurised air through the plenum chamber inlet port. 
 
     
     
         27 . The patient interface of  claim 26 , wherein the outwardly facing surface of the vent wall is convex and an inwardly facing surface of the vent wall opposite the outwardly facing surface is convex. 
     
     
         28 . The patient interface of  claim 26 , wherein the vent holes are tapered so that the vent holes narrow in a direction toward the outwardly facing surface of the vent wall. 
     
     
         29 . A respiratory therapy system comprising:
 the patient interface of  claim 26 ;   a respiratory pressure therapy device configured to generate the flow of air at the therapeutic pressure; and   an air circuit configured to direct the flow of air at the therapeutic pressure from the respiratory pressure therapy device to the patient interface.