The present invention is in the field of medicine, particularly in the treatment of Type II diabetes and obesity. The flow modulating elements 8 and resilient elements 10 are mounted on a common support ring 6. A set of platforms may be supported by structure that resides in the space immediately below the platforms, thus access to the platforms is unobstructed by support structure for the platforms above. The tab is caught by the engaging element, thereby preventing the head from falling to and colliding with the disk.