US Patent 8105392 Pyloric obesity valve

The pyloric obesity valve includes a tubular valve body having proximal and distal ends. The valve body has an intermediate section which is between the proximal and distal ends. The proximal end is enlarged transversely relative to the intermediate section. The valve body has an inner surface and a lumen. The inner surface which is within the intermediate section has a cross-sectional area which is smaller than a cross-sectional area of the inner surface which coincides with the proximal end to resist a flow through the lumen of the valve body from the proximal end to the intermediate section.