Helical ostium support for treating vascular bifurcations
A prosthesis is disclosed for placement across an ostium opening from a main body lumen to a branch body lumen. The prosthesis comprises a radially expansible support at one end, a circumferentially extending link at the other end and at least one spiral frond extending axially therebetween.
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, a circumferential link on the proximal end and at least one spiral frond having a distal end connected to the support structure and a proximal end connected to the circumferential link; transluminally navigating the scaffold to a treatment site; and deploying the scaffold at the site such that the support is in the branch lumen and the circumferential link is in the main lumen positioned a distance from the bifurcation wherein a first end of the spiral frond is located on a branch vessel side of the ostium, and a second end of the spiral frond is located on a main vessel side of the ostium.
2. A method as in claim 1 , further comprising the step of positioning an inflatable balloon in the main lumen, and deforming the circumferential link such that it conforms 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 of supporting a vessel wall in the vicinity of an ostium between a main vessel and a branch vessel, comprising the steps of: providing a radially expandable scaffold, a circumferential link, and positioning at least one spiral frond across the ostium, the frond having a first end on a first, branch vessel side of the ostium and a second end terminating on a second, main vessel side of the ostium; supporting the first end of the frond against the vessel wall on the first side of the ostium; and biasing the second end of the frond radially outward and toward the vessel wall on the second side of and spaced from the ostium.
5. A method of supporting a vessel wall as in claim 4 , wherein the supporting the first end step comprises expanding a first expandable support structure against the vessel wall.
6. A method of supporting a vessel wall as in claim 5 , wherein the first expandable support structure is attached to the first end of the frond.
7. A method of supporting a vessel wall as in claim 5 , wherein the expanding step comprises permitting the first expandable support structure to self expand.
8. A method of supporting a vessel wall as in claim 5 , wherein the expanding step comprises forcibly expanding the first expandable support structure.
9. A method of supporting a vessel wall as in claim 4 , wherein the supporting the second end step comprises expanding a second expandable support structure against the vessel wall.
10. A method of supporting a vessel wall as in claim 9 , wherein the second expandable support structure is attached to the second end of the frond.
11. A method of supporting a vessel wall as in claim 9 , wherein the expanding step comprises expanding the second support structure such that the second end of the frond is entrapped between the second support structure and the vessel wall.
12. A method of supporting a vessel wall as in claim 4 , comprising the step of positioning at least two fronds across the ostium.
13. A method of supporting a vessel wall as in claim 4 , comprising the step of positioning at least four fronds across the ostium.
14. A method of supporting a vessel wall as in claim 4 , wherein all of the spiral fronds are positioned across the ostium and have a first end connected to the scaffold and a second end connected to the circumferential link.