Electrical Stimulation Therapy (EST) of the Lower Esophageal Sphincter (GERD)

The investigational device that will be used in this trial is the EndoStim® Lower Esophageal Sphincter (LES) Stimulation System. The purpose of this trial is to evaluate the safety and the effectiveness of electrical stimulation therapy (EST) on the lower esophageal sphincter (LES) in the treatment of subjects with gastroesophageal reflux disease (GERD). The study population will consist of subjects diagnosed with pathological GERD as defined by abnormal pH and who complain of heartburn, regurgitation or both for \> 6 months, on a daily PPI use.