Self-adjusting gastric band

摘要

A self-adjusting gastric band (105) comprises an inflatable portion (110) that includes a fluid such as saline. A reservoir is spaced from the inflatable portion according to a distance related to a wavelength of a peristaltic wave that propagates through the esophageal - gastric junction. A pressure - relief valve is coupled between the inflatable portion and the reservoir and allows an amount of the fluid to pass from the inflatable portion to the reservoir when a first force generates an increased pressure in the inflatable portion. The amount of fluid is released to allow the large bolus to pass through the esophageal - gastric junction. A contracted portion of the peristaltic wave is proximate the reservoir when an expanded portion of the wave is proximate the inflatable portion of the self-adjusting gastric band, to facilitate allowing the amount of the fluid to enter the reservoir.