A looped cannula for administering oxygen and consisting of a flexible hollow tube having apertures disposed along a preselected midlength of the loop and at circumferentially spaced locations so that once the loop is encircled about the head of the patient and the loop is preferentially tightened, there...http://www.google.com.au/patents/US4406283?utm_source=gb-gplus-sharePatent US4406283 - Oxygen cannulae for continuous administration of oxygen, and its associated mounting structure and method for mounting same onto the head of a patient
