Bifurcated endovascular prosthesis having tethered contralateral leg

1. An endovascular prosthesis system comprising:

a main tubular body having an open end and an opposed ipsilateral leg and a contralateral leg, said ipsilateral leg and contralateral leg each having an open end;

the tubular body comprising a bifurcation point between the ipsilateral leg and the contralateral leg, a distal ipsilateral leg portion and a distal contralateral leg portion;

a graft material extending between the ipsilateral leg and the contralateral leg;

wherein the graft material restrains movement of the contralateral leg with respect to the ipsilateral leg, and

wherein the graft material between the ipsilateral leg and the contralateral leg increases in a direction extending from the bifurcation point to the distal ipsilateral leg portion or distal contralateral leg portion.

2. The endovascular prosthesis system of claim 1 , wherein the graft material has a distal portion near a distal portion of the ipsilateral leg and near a distal portion of the contralateral leg; wherein the graft material has a proximal portion near the bifurcation point of the graft wall where the ipsilateral leg and the contralateral leg separate from the main tubular body; and wherein the distal portion of the graft material is configured to allow more independent mobility of the distal portions of the ipsilateral leg and the contralateral leg as compared to proximal portions of the ipsilateral leg and the contralateral leg near the bifurcation point.

3. The endovascular prosthesis system of claim 2 , wherein the endovascular prosthesis system is configured to restrict the contralateral leg from significant rotational movement so as to prevent misalignment within a bodily lumen.

4. The endovascular prosthesis system of claim 3 , wherein the graft material comprises a weakened portion that is configured to allow separation of one portion of the graft material from another portion of the graft material.

5. The endovascular prosthesis system of claim 4 , wherein the weakened portion comprises a tear line.

6. The endovascular prosthesis system of claim 5 , wherein the graft material comprises a plurality of connections extending between the ipsilateral leg and contralateral leg.

7. The endovascular prosthesis system of claim 6 , wherein each of the plurality of connections is shaped to allow more relative independent movement of distal portions of the ipsilateral leg and the contralateral leg.

8. An endovascular prosthesis system comprising:

a main tubular body having an open end and opposed an ipsilateral leg and a contralateral leg, said ipsilateral leg and contralateral leg each having an open end;

a web of biocompatible material extending between the ipsilateral leg and the contralateral leg; and

wherein the web restrains movement of the contralateral leg with respect to the ipsilateral leg wherein the web of biocompatible material is triangular-shaped.

9. The endovascular prosthesis system of claim 8 , wherein the endovascular prosthesis system is configured to restrict the contralateral leg from significant rotational movement so as to prevent misalignment within a bodily lumen.

10. The endovascular prosthesis system of claim 9 , wherein the web has a thickness; and wherein the thickness of a distal portion of the web is less than the thickness of a proximal portion of the web.

11. The endovascular prosthesis system of claim 8 , wherein a distal edge of the web is curved to allow the ipsilateral leg and contralateral leg more relative independent movement as compared to a web without a curved distal edge.

12. The endovascular prosthesis system of claim 8 , wherein the endovascular prosthesis system is configured to restrict the contralateral leg from significant longitudinal movement so as to prevent bunching up of the contralateral leg.

13. The endovascular prosthesis system of claim 8 , wherein the web comprises a planar sheet of biocompatible material.

14. The endovascular prosthesis system of claim 8 , wherein the endovascular prosthesis system comprises non-textile polymeric material; wherein the non-textile polymeric material of the endovascular prosthesis system comprises extruded polytetrafluoroethylene; and wherein said extruded polytetrafluoroethylene is non-porous polytetrafluoroethylene.

15. The endovascular prosthesis system of claim 8 , wherein the web comprises a plurality of connections extending between the ipsilateral leg and contralateral leg.

16. The endovascular prosthesis system of claim 15 , wherein the plurality of connections comprise interconnections between the ipsilateral leg and contralateral leg.

17. The endovascular prosthesis system of claim 16 , wherein each of the plurality of connections comprise a weakened portion; and

wherein the weakened portion is configured to separate one portion of the web from another portion of the web.

18. The endovascular prosthesis system of claim 16 , wherein each of the plurality of connections is shaped to allow more relative independent movement of distal portions of the ipsilateral leg and the contralateral leg.

19. An endovascular prosthesis system comprising:

a main tubular body having an open end and an opposed ipsilateral leg and contralateral leg defining a graft wall therein between, said ipsilateral leg and contralateral leg each having an open end;

a graft material extending between the ipsilateral leg and the contralateral leg;

wherein the graft material restrains movement of the contralateral leg with respect to the ipsilateral leg;

wherein the graft material comprises a plurality of connections between the ipsilateral leg and the contralateral leg;

wherein at least one of the plurality of connections comprise a weakened portion that is configured to allow separation of one portion of the graft material from another portion of the graft material.

20. The endovascular prosthesis system of claim 19 , wherein the plurality of connections are sized to permit independent movement of distal portions of the ipsilateral leg and the contralateral leg.