Device for anastomotic bypass

A method of forming an anastomosis between first and second spaced apart body vessels, comprising:

• implanting a stent through a tissue wall with a first open end of the stent disposed within the first body vessel and a second open end of the stent disposed within the second body vessel, the stent including a tubular body formed of one or more interwoven wires extending continuously from the first open end to the second open end, the tubular body defining a lumen extending between the first and second open ends, the stent including at least three longitudinally spaced apart anchor members extending radially outward from the tubular body, the anchor members each having an outer diameter larger than an outer diameter of the tubular body disposed between the anchor members, the at least three anchor members including a first anchor member adjacent the first open end, a second anchor member adjacent the second open end, and a center anchor member, the at least three anchor members dividing the tubular body into at least a first saddle region extending between the first anchor member and the center anchor member, and a second saddle region extending between the center anchor member and the second anchor member, wherein the stent further comprises a covering extending over an entirety of an outer surface of the tubular body, and the at least three anchor members, wherein the covering extends longitudinally beyond the first open end of the tubular body, forming a collapsible tubular sleeve, wherein implanting the stent includes first inverting and extending the collapsible tubular sleeve through the lumen of the tubular body from the first open end of the tubular body and extending out the second open end of the stent with a free end of the collapsible tubular sleeve extending beyond the second open end of the tubular body, and then implanting the stent by placing the stent with a first vessel wall of the first body vessel disposed within the first saddle region and a second vessel wall of the second body vessel disposed within the second saddle region;
• wherein prior to implanting the stent, the first and second body vessels have an original spaced-apart configuration, wherein placing the first and second vessel walls in contact with the center anchor member holds the first and second body vessels in their original spaced-apart configuration;
• and
• draining fluid from the first body vessel through the lumen of the stent into the second body vessel.

A method of forming an anastomosis between first and second spaced apart body vessels, comprising:

• implanting a stent through a tissue wall with a first open end of the stent disposed within the first body vessel and a second open end of the stent disposed within the second body vessel, the stent including a tubular body formed of one or more interwoven wires, the tubular body defining a lumen extending between the first and second open ends, the stent including at least three longitudinally spaced apart anchor members extending radially outward from the tubular body, the anchor members each having an outer diameter larger than an outer diameter of the tubular body disposed between the anchor members, the at least three anchor members including a first anchor member adjacent the first open end, a second anchor member adjacent the second open end, and a center anchor member, the stent further including first and second side dividers each extending radially outward from the tubular body and having an outer diameter larger than the outer diameter of the tubular body, the first side divider, the second side divider, and the center anchor member dividing the tubular body into at least a first saddle region extending between the first anchor member and the first side divider, a second saddle region extending between the second anchor member and the second side divider, a third saddle region extending between the first side divider and the center anchor member, and a fourth saddle region extending between the second side divider and the center anchor member;
• wherein the center anchor member is moveable from a first, contracted configuration in which the center anchor member has a first axial length, to a second, fully expanded configuration in which the center anchor member has a second axial length greater than the first axial length, the center anchor member expanding axially while compressing radially as it moves from the first configuration to the second configuration;
• wherein prior to implanting the stent, the first and second body vessels have an original spaced-apart configuration, wherein placing the first and second vessel walls in contact with the center anchor member holds the first and second body vessels in their original spaced-apart configuration;
• wherein implanting the stent includes first expanding or contracting the center anchor member into the first or second configuration, and then placing the stent with a first vessel wall of the first body vessel disposed within the first saddle region and a second vessel wall of the second body vessel disposed within the second saddle region;
• and
• draining fluid from the first body vessel through the lumen of the stent into the second body vessel.