Abstract: An example cannula may include a cannula body defining an exhalation lumen configured to receive a volume of exhalation from a patient. The cannula body defines an oxygen inlet at a surface of the cannula body. The cannula body defines a plurality of elongated oxygen delivery openings fluidically coupled to the oxygen inlet and being arranged and sized to deliver substantially symmetrical oxygen flow to nostrils of the patient.

Abstract: An example cannula may include a cannula body and at least one prong extending from the cannula body. The cannula body defines an exhalation lumen configured to receive a volume of exhalation from a patient. The at least one prong defines a prong lumen fluidically coupled to the exhalation lumen. The prong lumen extends to a prong opening configured to introduce the volume of exhalation from the patient into the exhalation lumen. At least a portion of the prong opening faces radially outward from the at least one prong.

Abstract: A device adapted to be inserted into a lumen, the device having a longitudinal axis and comprising: a) a support element extending along the longitudinal axis; b) a tool mechanically mounted on the support element and being adapted to be used near a wall of the lumen on at least a first side of the longitudinal axis; and c) element, the balloon having at least one portion that is less radially expandable than at least one other portion of the balloon, at a same axial position along said support element.