Various embodiments of tracheostomy tube assemblies including a cannula, a cap, and a flange are provided. The cannula includes a distal end and a proximal end, the distal end being adapted to be inserted into a patient's trachea. The annular cap includes an annular body having a first surface adapted to be received into the proximal end of the cannula to retain a portion of the cap in the annular body. The flange member includes a second surface that engages the proximal end of the cannula such that the proximal end of the cannula is retained between the second surface of the flange member and the first surface of the annular cap. The flange member also includes a third surface adapted to engage an inner surface of the annular body of the annular cap to retain the flange member between the annular cap and the proximal end of the cannula.