In accordance with the present invention, there is provided an adaptor or attachment which is suitable for integration into the patient circuit of a ventilation system, such as a non-invasive open ventilation system, is configured for attachment to any standard ventilation mask, and is outfitted with a jet pump which creates pressure and flow by facilitating the entrainment of ambient air. The adaptor comprises a base element and a nozzle element which are operatively coupled to each other. The base element further defines a throat and at least one entrainment port facilitating a path of fluid communication between the throat and ambient air. The nozzle element includes a jet nozzle, and a connector which is adapted to facilitate the fluid coupling of the nozzle element to a bi-lumen tube of the patient circuit. The connector includes both a delivery port and a sensing port. The jet nozzle and the delivery port collectively define a delivery line or lumen which fluidly communicates with the throat of the base element, and is placeable into fluid communication with the delivery lumen of the bi-lumen tube.La présente invention concerne un adaptateur ou un accessoire qui convient à l'intégration dans le circuit pour patient d'un système de ventilation, comme un système de ventilation ouvert non invasif, qui est conçu pour venir se fixer à un quelconque masque de ventilation standard, et qui comprend une pompe à jet générant une pression et un débit en facilitant l'entraînement de l'air ambiant. L'adaptateur comprend un élément de base et un élément buse qui sont couplés fonctionnellement l'un à l'autre.
