Patent ID: 7862601

Claim:
A method for implanting a prosthesis within an ostium extending from a main lumen into a branch lumen using an elongate member comprising first and second expandable members on a distal end of the elongate member, the prosthesis comprising first and second portions surrounding the first and second expandable members, respectively, the first portion having a length greater than the second portion and comprising material that requires greater force to expand than the second portion, the method comprising: directing the distal end of the elongate member into the main lumen with the first and second portions in a contracted condition; expanding the second expandable member to cause the second portion of the prosthesis to flare radially outwardly from the first portion within the main lumen while the first portion of the prosthesis remains in the contracted condition; after expanding the second expandable member, directing the distal end into the branch lumen until the flared second portion contacts a wall of the main lumen surrounding the ostium and the first portion is disposed within the branch lumen; after directing the distal end into the ostium, expanding the first expandable member to expand the first portion of the prosthesis to contact a wall of the branch lumen; collapsing the first and second expandable members; and withdrawing the elongate member from the branch and main lumens, leaving the prosthesis with the first portion expanded within the branch lumen and the second portion contacting the wall of the main lumen surrounding the ostium.