US Patent 9604024 Divided cannula with each nare communicating with each flow path

A divided cannula comprising a cannula body which is divided by a partitioning wall into first and second flow chambers. The first flow chamber has first and second spaced apart nare passages while the second flow chamber has first and second spaced apart nare passages. The cannula body supports spaced apart first and second nares and each of the first and the second nares defines a common nare passage. The first nare passage of the first internal flow chamber and the first nare passage of the second internal flow chamber both communicate with the common nare passage of the first nare and the second nare passage of the first internal flow chamber and the second nare passage of the second internal flow chamber both communicate with the common nare passage of the second nare. A pressure sensing line and a gas supply line interconnected to the divided cannula with a gas supply system.