I claim the ornamental design for a medical tube with radio-opaque double helix indicia, as shown and described.
FIG. 1 is a perspective view of a medical tube with radio-opaque double helix indicia, showing my new design;
FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image thereof;
FIG. 3 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof; and,
FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image thereof.
The broken lines in the drawings illustrate portions of the medical tube with radio-opaque double helix indicia and form no part of the claimed design.