A shunt for treatment of a patient, comprising: a tubular structure having a radially compressed configuration and a radially expanded configuration; and, said radially expanded configuration comprising a flared state of distal and proximal ends and a foreshortened length; said flared state and said foreshortened length being sufficient to secure said tubular structure between tissue of two lumens of a patient; said tubular structure, in its radially compressed configuration, comprising: a plurality of tubular radial bands, each of which having a plurality of straight regions joined together to form a pattern of triangular peaks; said triangular peaks of each tubular radial band aligned with each other and connected via a portion so as to form tubular radial bands of a plurality of diamond-shaped cells; characterised in that said bands of said plurality of diamond-shaped cells (102A, 102B, 102C. 102D) comprising a middle band, a plurality of proximal bands, and a plurality of distal bands; wherein said plurality of diamond-shaped cells of said plurality of proximal bands and said plurality of distal bands progressively increase in proximal-to-distal length further away from said middle bands in said radially compressed configuration, causing said plurality of proximal bands and said plurality of distal bands to foreshorten and progressively increase in radial diameter such that said middle band, said plurality of proximal bands, and said plurality of distal bands reach maximum expansion at diameters to achieve said flared state of said distal end and said proximal end, and said foreshortened length. a tubular structure having a radially compressed configuration and a radially expanded configuration; and, said radially expanded configuration comprising a flared state of distal and proximal ends and a foreshortened length; said flared state and said foreshortened length being sufficient to secure said tubular structure between tissue of two lumens of a patient; said tubular structure, in its radially compressed configuration, comprising: a plurality of tubular radial bands, each of which having a plurality of straight regions joined together to form a pattern of triangular peaks; said triangular peaks of each tubular radial band aligned with each other and connected via a portion so as to form tubular radial bands of a plurality of diamond-shaped cells; characterised in that said bands of said plurality of diamond-shaped cells (102A, 102B, 102C. 102D) comprising a middle band, a plurality of proximal bands, and a plurality of distal bands; wherein said plurality of diamond-shaped cells of said plurality of proximal bands and said plurality of distal bands progressively increase in proximal-to-distal length further away from said middle bands in said radially compressed configuration, causing said plurality of proximal bands and said plurality of distal bands to foreshorten and progressively increase in radial diameter such that said middle band, said plurality of proximal bands, and said plurality of distal bands reach maximum expansion at diameters to achieve said flared state of said distal end and said proximal end, and said foreshortened length. a plurality of tubular radial bands, each of which having a plurality of straight regions joined together to form a pattern of triangular peaks; said triangular peaks of each tubular radial band aligned with each other and connected via a portion so as to form tubular radial bands of a plurality of diamond-shaped cells; characterised in that said bands of said plurality of diamond-shaped cells (102A, 102B, 102C. 102D) comprising a middle band, a plurality of proximal bands, and a plurality of distal bands; wherein said plurality of diamond-shaped cells of said plurality of proximal bands and said plurality of distal bands progressively increase in proximal-to-distal length further away from said middle bands in said radially compressed configuration, causing said plurality of proximal bands and said plurality of distal bands to foreshorten and progressively increase in radial diameter such that said middle band, said plurality of proximal bands, and said plurality of distal bands reach maximum expansion at diameters to achieve said flared state of said distal end and said proximal end, and said foreshortened length.