FIG. 1 is a perspective view of a cart body for a medical waster disposal system showing my new design;

FIG. 2 is a perspective view of the cart body;

FIG. 3 is a side elevation view of FIG. 2;

FIG. 4 is a rear elevation view of FIG. 2;

FIG. 5 is a front elevation view of FIG. 2;

FIG. 6 is a top plan view of FIG. 2; and,

FIG. 7 is a bottom plan view of FIG. 2.

The features indicated in the figures in broken lines form no part of the claimed design.