A respiratory interface device (10, 20, 30, 40, 50, 60, 70, 80) comprising a main body (12, 22, 32, 42, 52, 62, 72, 82) that includes a fluid conduit adapted to be connected to a breathing circuit, and a sealing member (15, 25, 35, 45, 55, 65, 75, 85) adapted to engage a surface of a patient, such that the fluid conduit is in fluid communication, in use, with an airway of the patient, wherein the sealing member (15, 25, 35, 45, 55, 65, 75, 85) includes a plasticising agent, and a barrier member (18, 28, 38, 48, 58, 68, 78, 88) is provided between the sealing member (15, 25, 35, 45, 55, 65, 75, 85) and the main body (12, 22, 32, 42, 52, 62, 72, 82) of the device(10, 20, 30, 40, 50, 60, 70, 80), the barrier member (18, 28, 38, 48, 58, 68, 78, 88) at least impeding the migration of plasticising agent from the sealing member (15, 25, 35, 45, 55, 65, 75, 85) to the main body (12, 22, 32, 42, 52, 62, 72, 82) of the device(10, 20, 30, 40, 50, 60, 70, 80).L’invention concerne un dispositif d’interface respiratoire (10, 20, 30, 40, 50, 60, 70, 80) comprenant un corps principal (12, 22, 32, 42, 52, 62, 72, 82) comprenant une conduite de fluide conçue pour être reliée à un circuit respiratoire, et un élément d’étanchéité (15, 25, 35, 45, 55, 65, 75, 85) conçu pour entrer en contact avec une surface d’un patient, de sorte que la conduite de fluide soit en communication fluidique, lors de son utilisation, avec les voies respiratoires du patient, l’élément d’étanchéité (15, 25, 35, 45, 55, 65, 75, 85) comprenant un agent plastifiant et un élément barrière (18, 28, 38, 48, 58, 68, 78, 88) étant formé entre l’élément d’étanchéité (15, 25, 35, 45, 55, 65, 75, 85) et le corps principal (12, 22, 32, 42, 52, 62, 72, 82) du dispositif (10, 20, 30, 40, 50, 60, 70, 80), l’élément barrière (18, 28, 38, 48, 58, 68, 78, 88) entravant au moins la migration de l’agent plastifiant depuis l’élément d’étanchéité (15, 25, 35, 45, 55, 65, 75, 85) vers le corps principal (12, 22, 32, 42, 52, 62, 72,
