They are still making dramatic improvements in DBS.
"The problem with this promising therapy ... is that not every patient receives a video-worthy benefit.
“There’s a big distribution of the quality of outcomes that patients actually get from DBS—in some cases, it can even cause more side effects than it heals,” Harel said.
“What we understand today is the correct placement of the DBS electrode is the crucial part in deciding the outcome for the benefits. It’s just like real estate, it’s all about location, location, location.”
"These tiny devices, which are barely larger than a grain of rice, may not be able to stimulate the target brain region if they end up just one or two millimeters away. Studies showed surgeons who used the SIS System could identify the target location for DBS nodes with about 70 percent greater accuracy than previous methods allowed."