A patient interface to deliver of a flow of air at a positive pressure with respect to ambient air pressure to an entrance to the patient's airways including at least the entrance of a patient's nares while the patient is sleeping, to ameliorate sleep disordered breathing, includes a seal-forming structure constructed and arranged to form a seal with a region of a patient's face surrounding the entrance to the patient's airways, a positioning and stabilising structure to provide a force to hold the seal-forming structure in a therapeutically effective position on a patient's head, and a connector assembly adapted to connect to an air circuit. The connector assembly includes a ring member configured to be removably and releasably secured in an aperture of an attachment region of the patient interface and an elbow assembly configured to connect to the air circuit. The elbow assembly is repeatedly connectable to and disconnectable from the ring member. The elbow assembly includes an elbow member and a clip member. The clip member includes a separate and distinct structure from the elbow member, and the clip member is structured and arranged to connect to the elbow member. The clip member is configured and arranged to releasably connect the elbow assembly to the ring member, and the elbow member is configured and arranged to form a seal with the ring member when the elbow assembly and the ring member are connected to one another.L'invention concerne une interface patient, permettant de délivrer un flux d'air à une pression positive par rapport à la pression d'air ambiant dans une entrée des voies respiratoires du patient, comprenant au moins l'entrée des narines du patient, pendant le sommeil du patient, afin d'améliorer les troubles respiratoires du sommeil, l'interface patient comprenant une structure formant un joint d'étanchéité conçue et agencée pour former un joint d'étanchéité avec une région du visage d'un patient entourant l'entrée des voies respiratoires du pa
