Jm, I assume you've seen this website:
Artificial Disc Replacement Surgery
Perhaps because of the legal and PR nightmares, they may have changed names, dropped names, re-organized, whatever -- but it's the same cast of characters (Ritter-Lang, their US salesguy, etc.). Again, pls read all the posts in the FAQ I offered on Stenum.
As patients, we have to be as precise as surgeons when asking questions.