A tracheal tube inner cannula comprising:a conduit configured to be inserted into an outer cannula to transfer gas to a patient, the conduit comprising a flared proximal region, wherein the flared proximal region is configured to be inserted in an outer cannula connector and wherein the flared proximal region comprises:a first ear and a second ear separated by opposing notches formed in a wall of the flared proximal region, wherein the opposing notches extend from the flared proximal region towards a distal end of the inner cannula such that an outer circumference of a proximal end of the inner cannula is a broken annulus and wherein the first ear and the second ear are configured to be biased towards one another when the flared proximal region is inserted in the outer cannula connector.
