I am looking for information relating to TN surgery that combines balloon compression and glycerol.

We have a preliminary (pre-physical evaluation & MRI) recommendation by a "prominent" neurosurgeon to treat my wife's TN (with MS) using balloon compression with glycerol. If I understand correctly, this combined procedure has been used successfully used by Dr. Ben Carson at Johns Hopkins. I don't know if he pioneered the approach. The combination apparently extends the pain-free period; however, I have not been able to find any literature/papers that discuss this approach.