Brenda, yes Mayo Clinic is studying the use of gastric per-oral endoscopic myotomy (G-POEM). Here is the abstract of a recent study.
- Gastric per-oral endoscopic myotomy (G-POEM) for the treatment of gastric sleeve stenosis: A feasibility and safety study https://mayoclinic.pure.elsevier.com/en/publications/gastric-per-oral-endoscopic-myotomy-g-poem-for-the-treatment-of-g-2

You can contact Mayo Clinic Clinical Trials to find out more about active and upcoming trials.
Phone: 800-664-4542 (toll-free)
https://www.mayo.edu/research/clinical-trials