Vascular bifurcation prosthesis with multiple thin fronds

1. A method for treating a bifurcation between a main lumen and a branch lumen, comprising the steps of:

providing a radially expandable scaffold, having a proximal end, a distal end, a support structure on the distal end, and at least two fronds extending in a proximal direction therefrom;

transluminally navigating the scaffold to a treatment site; and

deploying the support completely within the branch lumen such that all of the at least two fronds extend across the ostium and proximally into the main lumen in a direction opposite to blood flow;

wherein the fronds have an axial length that is at least 1.5 times the width of the support structure prior to radial expansion.

2. A method as in claim 1 , further comprising the step of positioning an inflatable balloon in the main lumen, and deforming the fronds such that they conform to at least a portion of the wall of the main lumen.

3. A method as in claim 2 , further comprising the step of deploying a stent in the main lumen.

4. A method as in claim 3 , further comprising the step of positioning an inflatable balloon through a side wall of the main lumen stent, and into the branch vessel lumen, and inflating the balloon to provide an opening in the side wall of the main lumen stent in alignment with the branch lumen.

5. A method as in claim 1 , wherein providing a radially expandable scaffold further comprises providing the radially expandable scaffold on a balloon such that the fronds are coupled with an outer surface of the balloon.

6. A method as in claim 1 , further comprising removing a deployment device and leaving the support structure and the fronds within the patient.

7. A method as in claim 1 , further comprising expanding the fronds into engagement with a wall of the main lumen such that a flow path is maintained in the main body lumen between the fronds and beyond the bifurcation.

8. A method as in claim 1 , wherein deploying the support comprises deploying the support such that at least two fronds extend to a portion of the main lumen opposing the ostium at the bifurcation.

9. A method as in claim 1 , wherein at least three fronds extend proximally into the main lumen.

10. A method as in claim 1 , wherein positioning the radially expandable scaffold comprises aligning a visible marker on at least one of the scaffold, the fronds, a transluminal navigation device, and a deployment device with the bifurcation.

11. A method as in claim 1 , wherein the lumens are blood vessels.

12. A method as in claim 1 , wherein the scaffold is deployed with a balloon expanded within the scaffold.

13. A method as in claim 1 , wherein the fronds are deformed by expanding a balloon positioned transversely through the fronds.

14. A method as in claim 13 , wherein the scaffold and fronds are expanded and deformed by the same balloon.

15. A method as in claim 13 , wherein the scaffold and fronds are expanded and deformed by different balloons.

16. A method as in claim 1 , wherein a second prosthesis is deployed by a balloon catheter exchanged over a guidewire pre-positioned for deformation of the fronds.

17. A method as in claim 16 , wherein the fronds are deformed by deployment of a second prosthesis.

18. A method as in claim 16 , wherein the deployed second prosthesis supports the fronds over their lengths from the ostium of the bifurcation along the main lumen wall.

19. A method as in claim 16 , wherein the deployed second prosthesis entraps the fronds between the second prosthesis and a wall of the main lumen.

20. A method as in claim 16 , wherein the deployed second prosthesis is deployed such that at least one of the fronds is positioned between the second prosthesis and a wall of the main lumen.