Intragastric balloon, basically balloon introduced inside the stomach with help of gastroscope and filled up with saline, simulating large volume food inside your stomach. Could achieve modest weight loss, 10 – 15 % and could only leave it for 6- 12months. Once removed the weight could comes back again and could be associated with severe ongoing vomiting when the balloon blocks the stomach outlet.
Endoscopic bypass, based on hooking long plastic sleeve to the esophagus trying to avoid food passing through the stomach and proximal small bowel by dropping food well into the small bowel, basically virtual bypass without surgery. Now how long this plastic tube will stay, how secure the hooking will be and issues with food sticking to the plastic. It is good thinking but not practical as we could work out how our body dealt in the past with foreign material inserted.