Anti-obesity dual stent

A method for inducing weight loss in a patient, said method comprising:

• inserting tubular outer and inner structures of an anti-obesity dual stent into a duodenum in substantially coaxial relation therewith, the outer and inner structures having respective outer and inner surfaces and proximal and distal ends, the outer and inner structures having respective lumens, the lumen of the outer structure having an outer periphery which is defined by the inner surface of the outer structure, the inner structure being located within the lumen of the outer structure in coaxial relation therewith such that a transverse clearance is provided between the inner surface of the outer structure and the outer surface of the inner structure, the lumen of the inner structure having an outer periphery which is defined by the inner surface of the inner structure, the anti-obesity dual stent having a port structure connected to said outer structure to provide a conduit between said outer and inner surfaces thereof;
• locating the outer and inner structures within and longitudinally relative to the duodenum such that the proximal ends of the outer and inner structures have corresponding proximal positions relative to a papilla of Vater on an inner surface of the duodenum, said locating further positioning the distal ends of the outer and inner structures to have corresponding distal positions relative to the papilla of Vater, said locating further positioning the port structure to receive a digestive fluid from the papilla of Vater, the conduit of the port structure providing for the digestive fluid received therein to flow into the transverse clearance, said locating further positioning the lumen of the inner structure to communicate through the proximal end thereof with a pylorus which leads to the duodenum;
• and
• engaging a retainer structure of the anti-obesity dual stent with the inner surface of the duodenum to secure the port structure in the position thereof to receive the digestive fluid from the papilla of Vater, wherein said engaging further comprises securing the inner structure in the position thereof to provide the communication through the proximal end of the inner structure between the lumen thereof and pylorus;
• and
• wherein the inner and outer structures are each a sleeve structure within which is located a stent structure;
• wherein a groove is formed on the outer surface of the inner structure, said groove having rotational and longitudinal orientations which are offset relative to the inner structure, and
• wherein a groove is formed on the inner surface of the outer structure, said groove having rotational and longitudinal orientations which are offset relative to the outer structure.