Vascular bifurcation prosthesis

1. A prosthesis capable of being carried through a patient's vasculature over an expandable balloon and of being deployed at an ostium opening from a first body lumen to a second body lumen, the prosthesis comprising:

a radially expansible support having a cylindrical body extending between a distal end and a proximal end of the support and along a longitudinal axis of the prosthesis, the support configured to be deployed completely in the first body lumen;

a plurality of elongate members extending axially from either the proximal or distal end of the support and disposed along the longitudinal axis, the elongate members configured to extend across the ostium opening and into the second body lumen, wherein one or more of the elongate members have a shorter length along the longitudinal axis than other elongate members of the plurality of elongate members; and

at least one circumferential member spaced from the radially expansible support and coupled with at least one of the other elongate members,

wherein each of the one or more elongate members having a shorter length comprises less material than each of the other elongate members.

2. The prosthesis of claim 1 , wherein the at least one circumferential member is configured to radially constrain at least a first elongate member and a second elongate member over the expandable balloon at least during advancement through the patient's vasculature.

3. The prosthesis of claim 2 , wherein the at least one circumferential member is configured to release the at least a first and second elongate member prior to expansion of the balloon.

4. The prosthesis of claim 2 , wherein the at least one circumferential member is configured to release the at least a first and second elongate member upon expansion of the balloon.

5. The prosthesis of claim 2 , wherein the at least one circumferential member is expandable upon expansion of the balloon to permit the at least a first and second elongate member to be spaced farther apart from each other.

6. The prosthesis of claim 2 , wherein the at least one circumferential member is bioabsorbable over time.

7. The prosthesis of claim 2 , wherein the at least one circumferential member is bioerodable over time.

8. The prosthesis of claim 1 , wherein

the radially expansible support has a first wall pattern, and

wherein the plurality of elongate members has a second wall pattern different from the first wall pattern, the plurality of elongate members having substantially less radial rigidity than the radially expansible support.

9. The prosthesis of claim 1 , wherein the first body lumen is a branch body lumen, and wherein the plurality of elongate members is configured to link the prosthesis to a second prosthesis deployed in a main body lumen.

10. The prosthesis of claim 1 , wherein the at least one circumferential member is configured to separate from a distal portion of the prosthesis that includes the radially expansible support after being positioned at the ostium.

11. The prosthesis of claim 10 , wherein the at least one circumferential member is bioabsorbable over time.

12. The prosthesis of claim 10 , wherein the at least one circumferential member is bioerodable over time.

13. The prosthesis of claim 1 , wherein the at least one circumferential member is configured to separate from a proximal portion of the plurality of elongate members prior to expansion of the balloon at a target site.

14. The prosthesis of claim 1 , wherein the at least one circumferential member is configured to separate from a proximal portion of the plurality of elongate members upon expansion of the balloon at a target site.

15. The prosthesis of claim 1 , wherein the at least one circumferential member is configured to radially constrain the one or more of the elongate members having a shorter length during advancement through the patient's vasculature.

16. The prosthesis of claim 1 , wherein the one or more elongate members having a shorter length than other elongate members of the plurality of elongate members have a free proximal end.

17. The prosthesis of claim 1 , wherein the one or more of the elongate members having a shorter length are disposed at a position intermediate the proximal end of the support and the position of a proximal end of the other elongate members prior to deployment.

18. The prosthesis of claim 1 , wherein the at least one circumferential member comprises one or more circumferential members coupled with a proximal portion of at least two elongate members of the plurality of elongate members.

19. The prosthesis of claim 1 , wherein at least a portion of the prosthesis is impermanent over time.

20. The prosthesis of claim 19 , wherein a polymer matrix on a surface of the prosthesis is impermanent over time.

21. The prosthesis of claim 19 , wherein a proximal portion of the prosthesis including the at least one circumferential member is impermanent over time.

22. The prosthesis of claim 21 , wherein the at least one circumferential member is biodegradable.

23. The prosthesis of claim 1 , wherein

the support has a first radial strength to support the first body lumen, and

wherein the at least one circumferential member is fashioned from the same material as the support and the elongate members, the circumferential member having a second radial strength less than the first radial strength.

24. The prosthesis of claim 1 , wherein the at least one circumferential member comprises an undulating circumferentially expandable structure.

25. The prosthesis of claim 1 , wherein the at least one circumferential member comprises a first serpentine ring and the support comprises a second serpentine ring, the first serpentine ring having an axial length that is not greater than the axial length of the second serpentine ring.