Patent ID: 7922684

Claim:
A dual stent comprising: a tubular outer structure having outer and inner surfaces, said outer structure having proximal and distal ends, said outer structure having a lumen which has an outer periphery defined by said inner surface of said outer structure, a port structure connected to said outer structure, a tubular inner structure having outer and inner surfaces, said inner structure having proximal and distal ends, said inner structure having a lumen which has an outer periphery defined by said inner surface of said inner structure, said inner structure being located within said 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, wherein a retainer structure is connected to said outer and inner structures, said inner structure being impervious or semi-permeable to chyme, and said inner structure being impervious or semi-permeable to digestive fluid; 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.