Cyberonics, Inc. is a medical device company. The Company is engaged in the design, development, sale and marketing of medical devices for epilepsy, depression and heart failure. Its seminal product, the VNS Therapy System, is an implantable device that provides neuromodulation therapy for the treatment of drug-resistant epilepsy and treatment-resistant depression (TRD). The Company's VITARIA System is an implantable device that provides a form of neuromodulation therapy for the treatment of chronic heart failure (CHF). The VNS Therapy System and its VITARIA System include an implantable pulse generator to stimulate the vagus nerve; a lead that conducts current pulses from the pulse generator to the vagus nerve; a surgical instrument to assist with the implant procedure; equipment to enable the treating physician to set the pulse generator stimulation parameters for the patient; instruction manuals, and in the VNS Therapy System, magnets to suspend or induce stimulation manually.