The ornamental design for a motorizedmedicalbed, as shown and described.
FIG. 1 is a perspective view;
FIG. 2 is a front view;
FIG. 3 is a rear view;
FIG. 4 is a right side view;
FIG. 5 is a left side view;
FIG. 6 is a top view; and,
FIG. 7 is a bottom view.
The broken lines in the drawing depicting portions of the motorized medical bed are for illustrative purposes only and form no part of the claimed design.