DEVICE: Symmetry™ VNS Therapy Kit Model 98142 (05425025750511)

A long, surgical instrument used to tunnel an artificial passageway along vascular tissue planes to create a connecting channel typically for the introduction of a vascular graft or a vascular prosthesis. It can have a variety of designs, but basically it will be a long, round, stiff rod that tapers to a rounded point at the distal tip and have a handle at the proximal end to allow the surgeon to exert the necessary pressure and manipulation to push it through the body tissue. It will typically be made of high-grade stainless steel and possibly other materials for the handle, which may be detachable. This is a reusable device.

An implantable wire, insulated with non-conductive material except at its electrode(s), intended to be used to make an electrical connection between a pulse generator and the vagus nerve for vagus nerve stimulation (VNS).

An assembly of battery-powered devices intended to apply periodic electrical stimuli to the vagus nerve to help control seizures and/or to help treat psychiatric disorder symptoms (e.g., depression). The vagus nerve stimulation (VNS) is provided through an implantable pulse generator, typically placed in the anterior chest wall, and leads that run subcutaneously to where their electrodes are implanted around the left vagus nerve. The system may be programmed externally following implantation.