The ornamental design for a part of spinalfusioncage, as shown and described.
1. Part of spinal fusion cage
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
1.8 : Reference view of state of use
1.9 : Reference view of state of use
In the reproductions, the evenly-spaced broken lines show portions of a spinal fusion cage that form no part of the claim; the dash-dot-dash lines represent boundaries of the claimed design that form no part thereof.