Tracheal tube assembly

Claim 1

A TRACHEAL DEVICE COMPRISING: A FLEXIBLE OUTER TUBE HAVING PREDETERMINED CURVATURE AND ADAPTED TO BE INSERTED INTO THE TRACHEA OF THE USER THROUGH AN INCISION IN THE THROAT, AND A FLEXIBLE INNER TUBE HAVING AN EXTERNAL DIAMETER SLIGHTLY SMALLER THAN THE INTERNAL DIAMETER OF THE OUTER TUBE AND BEING FREELY INSERTABLE INTO THE OUTER TUBE; THE OUTER TUBE INCLUDING A TRANSVERSELY EXTENDING FLANGE AT ITS PROXIMAL END, WHICH FLANGE IS ADAPTED TO BEAR AGAINST THE SKIN OF THE USER AROUND THE INCISION, THE OUTER TUBE INCLUDING FURTHER A RING GROOVE LOCATED NEAR ITS PROXIMAL END OPENING, THE DIAMETER OF THAT RING GROOVE BEING LARGER THAN THE INSIDE DIAMETER OF THAT TUBE, SAID INNER TUBE INCLUDING A FLEXIBLE COLLAR OF ENLARGED DIAMETER ON ITS OUTER SURFACE LOCATED TO MATE WITH THE RING GROOVE OF THE OUTER TUBE, WHEN THE INNER TUBE IS INSERTED ITS MAXIMUM DISTANCE INTO THE OUTER TUBE, THE OUTER TUBE INCLUDING FURTHER AN OBLONG CONFIGURATION FORMING THE PROXIMAL END OPENING INTO THAT TUBE, WHICH OBLONG CONFIGURATION HAS A FIRST DIAMETER SUBSTANTIALLY THE SAME AS THE ENLARGED DIAMETER OF THE RING GROOVE, AND A SECOND DIAMETER, PERPENDICULAR TO THE FIRST, CONSIDERABLY SMALLER THAN THE ENLARGED DIAMETER OF THE RING GROOVE, AND ADAPTED TO HOLD THE COLLAR OF THE INNER TUBE IN PLACE IN THE RING GROOVE, AND THE INNER TUBE INCLUDING FURTHER A TRANSVERSELY EXTENDING FLANGE AT ITS PROXIMAL EXTREMITY, WHICH FLANGE IS FLEXIBLE AND MANUALLY GRIPPABLE AND LOCATED IN CLOSE PROXIMITY TO THE FLEXIBLE COLLAR AND WHICH FLANGE WHEN SQUEEZED IN A PREDETERMINED DIRECTION CONTRACTS THE COLLAR AND PERMITS WITHDRAWAL OF THE INNER TUBE FROM OUTER TUBE.