A patient interface device (25) includes a patient sealing assembly (35) including a cushion (40) and a frame member (45) coupled thereto, and an adjustable forehead support assembly (100). The adjustable forehead support assembly includes an adjustment mechanism (102) coupled to a forehead cushion (104), the adjustment mechanism including a forehead cushion support member (108) having a base portion (114) coupled to the forehead cushion, a projecting member (116) extending from the base portion, a rotatable knob member (110) having a surface (128) having a helical groove (130) provided therein, and a post (134) coupled to one of the frame member and the projecting member. The post is received within the helical groove, and rotation of the knob member causes a position of the post within the helical grove to change thereby causing relative movement between the projecting member and the frame member and movement of the frame member and the cushion relative to the forehead cushion.La présente invention concerne un dispositif dinterface patient (25) qui comprend un ensemble détanchéité patient (35) comprenant un coussin (40) et un élément de cadre (45) y étant couplé, et un ensemble de support frontal ajustable (100). Lensemble de support frontal ajustable comprend un mécanisme dajustement (102) couplé à un coussin frontal (104), le mécanisme dajustement comprenant un élément de support de coussin frontal (108) ayant une partie de base (114) couplée au coussin frontal, un élément de projection (116) sétendant de la partie de base, un élément de bouton rotatif (110) ayant une surface (128) à lintérieur de laquelle se trouve un sillon hélicoïdal (130), et un montant (134) couplé à lun des éléments de cadre et à lélément de projection. Le montant est reçu à lintérieur du sillon hélicoïdal, et la rotation de lélément de bouton entraîne la modification dune position du montant à lintérieur du sillon hélicoïdal, entraînant ainsi un mouvement relatif entre lélément de project
