Patent ID: 8252038

Claim:
A prosthesis delivery system for delivering a prosthesis to an Os opening from a main body lumen to a branch body lumen, the main body lumen having a main body lumen wall with a portion of the main body lumen wall opposing the Os, the prosthesis delivery system comprising: a delivery catheter having an expandable member, the expandable member having a proximal tapered zone and a distal tapered zone; a prosthesis carried over the expandable member, said prosthesis having a radially expandable scaffold section and at least two elongate members extending axially from a proximal end thereof, said elongate members having sufficient length to extend into and to expandably circumscribe the main body lumen wall and reach the portion of the main body lumen wall opposing the Os; and a capturing structure extending around all of the elongate members to prevent the elongate members from divaricating from the expandable member as the catheter is advanced through a patient's vasculature, the capturing structure having a proximal end located distal of a distal end of the proximal tapered zone of the expandable member at least in an unexpanded state; wherein the radially expandable scaffold section is not radially constrained by a structure that is separable from the delivery catheter.