Scientists at RPI are developing an implantable device for seizures:

Rensselaer Polytechnic Institute researchers are developing a tiny, highly efficient heat spreader to be used in a new device to be implanted in the brain of patients who suffer from severe epileptic seizures. The implant device is designed to detect and arrest epileptic seizures as they begin by cooling a small region of the brain, thereby effectively blocking the erratic electrical activity.

More information can be found here. ("Researchers develop tiny, highly efficient heat spreader for epileptic seizure treatment device", News-Medical.Net, Jul.26)