@willows and @pachab00 here is an excerpt from Mayo Clinic https://www.mayoclinic.org/diseases-conditions/gerd/diagnosis-treatment/drc-20361959
"LINX device. A ring of tiny magnetic beads is wrapped around the junction of the stomach and esophagus. The magnetic attraction between the beads is strong enough to keep the junction closed to refluxing acid, but weak enough to allow food to pass through. The LINX device can be implanted using minimally invasive surgery. The magnetic beads do not have an effect on airport security or magnetic resonance imaging."