Unitary spinal disc implant with a central core

The ornamental design for a unitary spinal disc implant with a central core, as shown and described.

FIG. 1 is a front perspective view of a unitary spinal disc implant with a central core, showing our new design;

FIG. 2 is a side elevation view thereof; and,

FIG. 3 is an exploded perspective view of FIG. 1.

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