According to various embodiments, a tracheal tube may employ optical sensing techniques for determining a distance between the inserted tube and an anatomical structure, such as a carina. The body is attached to the neck in the preferred embodiment by means of a lever actuating clamp providing a clamping force substantially parallel with the longitudinal axis of the neck and body and the tensioned strings so that when reassembled the guitar strings regain their prior pre-assembled state of tune. The airflow discharged from the device through the outlet section forms a jet with a horizontal axis.