Tracheal tube device

Claim 1

A TRACHEAL TUBE ASSEMBLY, COMPRISING: A CURVED OUTER CANNULA AND A SIMILARLY CURVED INNER CANNULA FORMED OF NON CORROSIVE RESILIENT MATERIAL, SAID OUTER CANNULA BEING ADAPTED FOR INSERTION INTO THE TRACHEA OF A USER, SAID INNER CANNULA BEING INSERTABLE INTO SAID OUTER CANNULA, THE PROXIMAL END OF SAID OUTER CANNULA BEING PROVIDED WITH A RADIAL FLANGE HAVING A FLAT CENTRAL PORTION AND OPPOSED WING PORTIONS, EACH OF SAID WING PORTIONS HAVING A TAB WHICH EXTENDS FORWARDLY AND INWARDLY, SAID INNER CANNULA HAVING AT ITS PROXIMAL END A FLAT RADIAL FLANGE ADAPTED FOR ABUTTING AGAINST THE FLAT CENTER PORTION OF THE OUTER-CANNULA FLANGE, SAID INNER-CANNULA FLANGE BEING PROVIDED WITH OPPOSITELY-DISPOSED APERTURED EARS EXTENDING FORWARDLY AND OUTWARDLY, THE NORMAL DISTANCE BETWEEN THE TIPS OF THE TABS OF THE OUTER-CANNULA FLANGE BEING SLIGHTLY LESS THAN THE NORMAL DISTANCE BETWEEN THE APERTURED EARS AS MEASURED BETWEEN POINTS LOCATED JUST BELOW THE APERTURES, WHEREBY WHEN SAID INNER CANNULA IS BEING INSERTED INTO SAID OITER CANNULA THE TABS OF SAID OUTER-CANNULA FLANGE ENGAGE THE LOWER PORTION OF THE EARS OF SAID INNER-CANNULA FLANGE, FORCING THE EARS SLIGHTLY TOGETHER UNTIL THE TIPS OF THE TABS ENTER THE APERTURES OF THE EARS, THEREBY TO RELEASABLY INTERLOCK SAID INNER AND OUTER CANNULAS.