System for delivering a prosthesis to a luminal OS
An embodiment of the invention provides a prosthesis delivery system comprising a delivery catheter having an expandable member and a prosthesis carried over the expandable member. The prosthesis includes a radially expandable scaffold section and at least two anchors extending axially from an end thereof; and means for capturing at least the anchors to prevent the anchors from divaricating from the expandable member as the catheter is advanced through a patient's vasculature.
1. 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.
2. A prosthesis delivery system as in claim 1 , wherein the capturing structure comprises a tether which circumscribes a proximal portion of the prosthesis.
3. A prosthesis delivery system as in claim 2 , wherein the tether is configured to be detached from the elongate members prior to expansion of the expandable member.
4. A prosthesis delivery system as in claim 3 , wherein the tether is configured to break upon expansion of the expandable member.
5. A prosthesis delivery system as in claim 1 , wherein the prosthesis comprises at least three circumferential elongate members extending axially from the end of the scaffold section.
6. A prosthesis delivery system as in claim 1 , wherein the elongate members have an axial length which is at least 1.5 times the width of the scaffold section prior to radial expansion.
7. A prosthesis delivery system as in claim 1 , wherein the elongate members have an axial length of at least 2 mm.
8. A prosthesis delivery system as in claim 1 , wherein the scaffold section comprises a plurality of axially adjacent cells.
9. A prosthesis delivery system as in claim 1 , wherein the elongate members are all congruent.
10. A prosthesis delivery system as in claim 1 , wherein the elongate members will radially expand when the scaffold section is radially expanded.
11. A prosthesis delivery system as in claim 1 , wherein the elongate members are adapted to both bend and rotate relative to a control axis of the prosthesis.
12. A prosthesis delivery system as in claim 1 , further comprising a radiopaque marker at or near a transition location between the scaffold section and the elongate members.
13. A prosthesis delivery system as in claim 1 , wherein the expandable member comprises a balloon having a radiopaque marker aligned with a transition location between the scaffold section and the elongate members.
14. A prosthesis delivery system as in claim 1 , wherein the capturing structure has a distal end located on a proximal portion of the elongate members.
15. A prosthesis delivery system comprising:
a delivery catheter having a balloon;
a prosthesis capable of being carried through the vasculature over the balloon and of being deployed at an Os, the prosthesis comprising:
a radially expandable scaffold section;
at least two elongate members extending axially from an end of the radially expandable scaffold section; and
a member extending around and coupled with the elongate members, the member being spaced axially from the radially expandable scaffold section such that a distal end of the member is located on a proximal portion of the elongate members, the member having a first, low profile configuration for maintaining the elongate members adjacent to the delivery catheter during advancement of the prosthesis through the patient's vasculature, the member also having a second configuration permitting the elongate members to separate from the delivery catheter and to move toward a wall of the vasculature opposite the Os, a proximal end of the member being positioned at or distal of a proximal end of the elongate members at least in the second configuration;
wherein the radially expandable scaffold section is secured to a first expandable zone of the balloon only by engagement of surfaces of the radially expandable scaffold section with surfaces on the balloon, the first expandable zone having a first diameter, and
wherein the proximal end of the elongate members are carried over a second expandable zone of the balloon, the second expandable zone having a second diameter not less than the first diameter of the first expandable zone at least in an expanded state.
16. A prosthesis delivery system as in claim 15 , wherein the member is expandable upon expansion of the balloon to permit the elongate members to be spaced farther apart from each other than when carried over the balloon.
17. A prosthesis delivery system as in claim 15 , wherein the member is detachable from the elongate members prior to expansion of the balloon.
18. A prosthesis delivery system as in claim 15 , wherein the member comprises a tether which circumscribes a proximal portion of the prosthesis.
19. A prosthesis delivery system as in claim 15 , wherein the member is configured to break upon expansion of the prosthesis.
20. A prosthesis delivery system as in claim 15 , wherein the prosthesis comprises at least three circumferential elongate members extending axially from the end of the scaffold section.
21. A prosthesis delivery system as in claim 15 , wherein the elongate members have an axial length which is at least 1.5 times the width of the scaffold section prior to radial expansion.
22. A prosthesis delivery system as in claim 15 , wherein the elongate members are adapted to both bend and rotate relative to a control axis of the prosthesis.
23. 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;
a prosthesis carried over the expandable member, said prosthesis having a radially expandable scaffold section, at least two elongate members each having a distal end coupled with a proximal end of the scaffold section, and at least one opening extending through a side wall of the prosthesis between the at least two elongate members and between the scaffold section and proximal ends of the elongate members, wherein, when expanded the opening defines a passage to receive a second prosthesis and when expanded said elongate members have sufficient length to extend into and in a same upstream blood flow direction within the main body lumen; and
a capturing structure having a distal end extending around a proximal portion of 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, wherein the scaffold section is carried over a first expandable zone of the expandable member, the first expandable zone having a first diameter and the proximal portion of the elongate members are carried over a second expandable zone of the expandable member, the second expandable zone having a second diameter not less than the first diameter of the first expandable zone at least in an expanded state.
24. A prosthesis delivery system as in claim 23 , wherein the capturing structure comprises folds of a balloon covering the elongate members.
25. A prosthesis delivery system as in claim 23 , wherein the capturing structure comprises a cuff which extends over the elongate members.
26. A prosthesis delivery system as in claim 23 , wherein the capturing structure comprises a tether which ties the elongate members together.