Nerve stimulator apparatus, namely, an implantable electrical stimulation device; electrical implantable stimulation device for sacral neuromodulation for medical purposes; neurostimulation system comprised of an implantable electrical stimulation device for sacral neuromodulation, a patient remote control to regulate stimulation parameters for the implantable device, and related embedded software that allows for communication between the remote control and the implantable device; medical system for sacral neurostimulation to treat bladder and bowel disorders comprised of an implantable electrical stimulation device for providing sacral neuromodulation, implantable pulse generator and electrical leads, a patient remote control to regulate stimulation parameters for the implantable device, related embedded software that allows for communication between the remote control and the implantable device.