• Medtronic's Spinal Unit (Memphis, Tennessee) said it has received approval to market two smaller kit sizes of Infuse bone graft for use in certain spinal fusion and dental regenerative procedures. The FDA has approved two additional configurations of Infuse bone graft: XX Small (0.7 cc) kit and X Small (1.4 cc) kit. Infuse bone graft is recombinant human bone morphogenetic protein-2 (rhBMP-2) applied to an absorbable collagen sponge carrier. The purpose of the protein, which occurs naturally in the body, is to stimulate bone formation. Implanted into a bone-deficient site, Infuse works with the body's own biology to induce normal bone formation.