Unitary spinal disc implant

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

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

FIG. 2 is a top plan view of the unitary spinal disc implant;

FIG. 3 is a top plan view of the unitary spinal disc implant;

FIG. 4 is a (right-handed) side elevation view unitary spinal disc implant;

FIG. 5 is a (left-handed) side elevation view unitary spinal disc implant;

FIG. 6 is a front elevation view of the unitary spinal disc implant;

FIG. 7 is a rear elevation view of the unitary spinal disc implant; and,

FIG. 8 is a rear perspective view of the unitary spinal disc implant of FIG. 1.

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