Currently, about 32,000 people have received the VNS system.
The VNS system was approved for people with partial onset seizures — seizures that begin in one part of the brain.
It is intended for people whose seizures do not respond to medications and who are either not good candidates for brain surgery or don’t want to have brain surgery.
Also, they must not have any other medical conditions that might be affected by the device. For example, VNS should not be used in people who have had certain other throat operations or disorders affecting the throat.
Currently, about 32,000 people have received the VNS system. A registry system that tracks about 5,000 people living with VNS includes about 60 percent with partial seizures; 15 percent with the Lennox-Gastaut syndrome (mixed seizures); and 25 percent with generalized seizures.