The ornamental design for a medicalthread, as shown and described.
FIG. 1 is a front perspective view of a medical thread showing the new design;
FIG. 2 is a front elevational view thereof, the back elevational view being a mirror image thereof;
FIG. 3 is a side elevational view thereof, the opposite side elevational view being a mirror image thereof;
FIG. 4 is a top view thereof, the bottom view being a mirror image thereof; and,
FIG. 5 is an enlarged view of FIG. 3.
The dot-dash broken lines indicate boundaries and form no part of the claimed design. The portions of the medical thread shown broken away indicate indeterminate length and form no part of the claimed design. The shading is provided merely to represent contours of the design and does not connote the character of the surfaces such as any specific texture, material, gloss, translucence, transparency, surface treatment, or surface decoration.