These devices are for treatment of gastroparesis. The best available evidence, however, find that they are of questionable utility for this condition. As of 2017 it is not approved for use for obesity in the United States. The first studies done did not find a benefit, however, research is ongoing.
Gastric electrical stimulation
Gastric pacing
Oral food challenge
Gastric tonometry
Esophageal pH monitoring
Impedance–pH monitoring
Caloric reflex test
Gastric lavage