The ornamental design for an endotrachealtube, as shown and described.
FIG. 1 is a side view of a right side of an endotracheal tube with a radiopaque chevron shaped biocompatible marker at a distal end and a series of dots.
FIG. 2 is a top view of an endotracheal tube with a radiopaque chevron shaped biocompatible marker at a distal end and a series of dots.
FIG. 3 is a bottom view of an endotracheal tube with a radiopaque chevron shaped biocompatible marker at a distal end and a series of dots; and,
FIG. 4 is a side view of an endotracheal tube shown in a condition of use.
The broken lines shown in FIG. 2 illustrate portions of the endotracheal tube that form no part of the claimed design. The broken lines shown in FIG. 4 illustrate environment and form no part of the claimed design.