Well, today I got my new bone stimulator. It's an ebt2 by biomet. Doctor told me to wear it for 4 hours a day, but the rep that brought it said to wear it as much as possible, that 24 hours a day wasn't too much.
Surgery was nov.30, 2 level 360 fusion, hardware with bmp, and bone stimulator 3 weeks after surgery. Hopefully this will stop any chance of pseudoarthrosis. Hopefully.