10 Medical instruments for assisting electrophysiologists during electrophysiology cardiac research studies, for performing cardiac ablations, and for diagnosis of arrhythmia; medical device, apparatus, and instruments for use in sensing, acquiring, digitizing, amplifying, filtering, measuring, calculating, analyzing, diagnosing, displaying, recording, and storing biomedical data, algorithms and signals in the fields of cardiology, neurology, nephrology, cognitive disorders and chronic pain; medical device and instruments that make use of signal processing technology for targeted nerve stimulation and peripheral nerve stimulation to treat sympathetic nervous system disorders, cardiovascular diseases, nephrological diseases, cognitive disorders, and chronic pain