An implantable device configured to be placed in a stomach of a patient to elevate with increased stomach contents and stimulate the cardia of the stomach, the device comprising: an elastic elongated member that has a three-dimensional relaxed configuration and a generally linear stressed configuration, the relaxed configuration including a flotation portion commencing at a second end of the elongated member, the flotation portion having a generally two-dimensional shape defining a plane, a plurality of spaced buoyant bodies affixed to the elongated member at spaced locations along the flotation portion, the buoyant bodies being hollow and sealed with air or an inert gas trapped therein so as to provide buoyancy, each of the buoyant bodies having a size adapted to fit through the esophagus without collapsing; and a stimulating body affixed to the first end of the elongated member, the stimulating body having a size adapted to fit through the esophagus without collapsing, wherein the device may be inserted transorally into the stomach in its stressed configuration characterized in that the relaxed configuration of the elastic elongated member further includes a cardia-stimulating portion terminating at a first end of the elongated member, the cardia-stimulating portion being oriented generally perpendicular to the plane defined by the flotation portion; and further characterized in that the device is permitted to resume its three-dimensional relaxed configuration in the stomach with the cardia-stimulating portion extending toward the cardia region of the stomach, wherein the flotation portion floats on the surface of fluid within the stomach while the cardia-stimulating portion projects therefrom toward the cardia and contacts the cardia when the device elevates within the stomach from an increase in the contents therein. an elastic elongated member that has a three-dimensional relaxed configuration and a generally linear stressed configuration, the relaxed configuration including a flotation portion commencing at a second end of the elongated member, the flotation portion having a generally two-dimensional shape defining a plane, a plurality of spaced buoyant bodies affixed to the elongated member at spaced locations along the flotation portion, the buoyant bodies being hollow and sealed with air or an inert gas trapped therein so as to provide buoyancy, each of the buoyant bodies having a size adapted to fit through the esophagus without collapsing; and a stimulating body affixed to the first end of the elongated member, the stimulating body having a size adapted to fit through the esophagus without collapsing, wherein the device may be inserted transorally into the stomach in its stressed configuration characterized in that the relaxed configuration of the elastic elongated member further includes a cardia-stimulating portion terminating at a first end of the elongated member, the cardia-stimulating portion being oriented generally perpendicular to the plane defined by the flotation portion; and further characterized in that the device is permitted to resume its three-dimensional relaxed configuration in the stomach with the cardia-stimulating portion extending toward the cardia region of the stomach, wherein the flotation portion floats on the surface of fluid within the stomach while the cardia-stimulating portion projects therefrom toward the cardia and contacts the cardia when the device elevates within the stomach from an increase in the contents therein.