Vagus Nerve Stimulation or VNS is a procedure used to control epileptic seizures.

It involves the use of a small device about the size of a silver dollar, which sends mild, electrical impulses to the brain via a nerve in the neck called the vagus nerve.

To implant the device, surgeons make a small incision in the neck and one below the collarbone.

Once the battery-operated, electrical pulse generator is implanted, a flexible, insulated plastic tube containing electrodes is run under the skin to the vagus nerve on the left side of the neck.

The generator delivers 30-second pulses of electricity to the vagus nerve every five minutes. These pulses block the electrical disturbances in the brain.

National Association of Epilepsy Centers: Level 4 Epilepsy Center