Nasal cannula

A nasal cannula comprising:

• a base portion defining a first therapeutic gas passageway that is configured to receive pressurized gas to deliver respiratory therapy to a patient;
• a nasal insert disposed adjacent said base portion and defining a second therapeutic gas passageway, the nasal insert being configured to be at least partially inserted into the patient's nare to provide high flow respiratory therapy, said second therapeutic gas passageway being in gaseous communication with and extending from said first therapeutic gas passageway so as to receive the pressurized gas from the first therapeutic gas passageway and to deliver the pressurized gas through the second therapeutic passageway into the patient's nare when the nasal insert is inserted at least partially into the patient's nare, wherein an external surface of the nasal insert includes one or more features that are configured to prevent the nasal insert from forming a seal with the patient's nare when providing the high flow respiratory therapy;
• and
• at least one sensor for measuring the properties of gas adjacent said nasal insert,
• wherein the one or more features included on the external surface of the nasal insert comprises one or more recesses formed in the external surface of the nasal insert,
• wherein the at least one sensor is positioned within the one or more recesses of the nasal insert and is connected to at least one electrical wire that extends from the at least one sensor and from nasal insert, wherein the at least one sensor is configured to transmit an signal via the electrical wire that indicates the measured properties of the gas adjacent to the nasal insert.