A patient interface device includes a bladder assembly having a headgear bladder member, a nose bridge bladder member, and a connecting tube member provided between the headgear bladder member and the nose bridge bladder member. The headgear bladder member is in sealed fluid communication with the nose bridge bladder member through the connecting tube member, and is filled with a fluid medium. The bladder assembly is structured such that the nose bridge bladder member will be inflated as a pressure on the headgear bladder member increases and such that the nose bridge bladder member will be deflated as the pressure on headgear bladder member decreases. Inflation of the nose bridge bladder member causes the top of a cushion member to move toward the patients nose bridge, and deflation of the nose bridge bladder member causes the top of the cushion member to move away from the patients nose bridge.La présente invention concerne un dispositif dinterface patient qui comprend un ensemble poche ayant un élément poche de casque, un élément poche darête nasale, et un élément tube de raccordement fourni entre lélément poche de casque et lélément poche darête nasale. Lélément poche de casque se trouve en communication fluidique hermétique avec lélément poche darête nasale via lélément tube de raccordement, et est rempli dun milieu fluide. Lensemble poche a une structure telle que lélément poche darête nasale est gonflé alors quune pression sur lélément poche de casque augmente et telle que lélément poche darête nasale est dégonflé alors que la pression sur lélément poche de casque diminue. Le gonflage de lélément poche darête nasale entraîne le déplacement du haut dun élément coussin en direction de larête nasale du patient, et le dégonflage de lélément poche darête nasale entraîne le déplacement du haut dun élément coussin à lécart de larête nasale du patient.