The ornamental design for the bone fusion implant, as shown and described.
FIG. 1 is a top perspective view of the bone fusion implant comprising our new design;
FIG. 2 is a bottom perspective view of the design of FIG. 1;
FIG. 3 is a top plan view of the design of FIG. 1;
FIG. 4 is a bottom plan view of the design of FIG. 1;
FIG. 5 is a front elevational view of the design of FIG. 1;
FIG. 6 is a back elevational view of the design of FIG. 1;
FIG. 7 is a left side elevational view of the design of FIG. 1; and,
FIG. 8 is a right side elevational view of the design of FIG. 1.
The broken lines immediately adjacent to the claimed areas represent the bounds of the claimed design while all other broken lines are directed to the environment and are for illustrative purposes only; the broken lines form no part of the claimed design.