Highly flexible stent and method of manufacture
Preferred embodiments of a stent with a high degree of flexibility are shown and described. The stent can include a continuous helical winding having interconnected struts joined at vertices, and having bridges connecting sections of the helical winding to each other. An annular ring can be provided at one or both ends of the helical winding, and the annular ring can have extensions extending to connect to the helical winding. One of the extensions can connect to a bridge and another extension can connect to a vertex. The struts at the ends of the helical winding can have strut lengths that differ from the strut lengths of the struts in a central portion of the winding between the ends of the winding.
1. A method of manufacturing an implantable prosthesis, comprising:
forming a first pattern defining a helical winding having a plurality of sections circumscribing an axis from a first end to a second end, wherein the sections are spaced along the axis, include a plurality of struts joined together defining a vertex between the struts, and have a bridge of a plurality of bridges connecting one section to another section; and
forming a second pattern defining a ring having a first extension and a second extension connected to the first or second ends of the helical winding, wherein the first extension connects to an end vertex at the first or second end, the second extension connects to the bridge of the plurality of bridges, and the ring includes a plurality of struts with adjacent struts joined together.
2. The method according to claim 1 , wherein the bridge of the plurality of bridges has a minimum width greater than a strut width.
3. The method according to claim 1 , wherein the helical winding is a single helical winding.
4. The method according to claim 1 , wherein the helical winding comprises a plurality of separate helical windings connected to each other.
5. The method according to claim 1 , wherein the bridge of the plurality of bridges extends parallel to the axis.
6. The method according to claim 1 , wherein the bridge of the plurality of bridges extends obliquely to the axis.
7. The method according to claim 1 , wherein the bridge of the plurality of bridges directly connects a peak of one section to a peak of another section.
8. The method according to claim 1 , wherein the bridge of the plurality of bridges directly connects a peak of one section to a trough of another section.
9. The method according to claim 1 , wherein the bridge of the plurality of bridges directly connects a trough of one section to a trough of another section.
10. The method according to claim 1 , wherein a strut of the plurality of struts has a width of approximately 65 microns.
11. A method of manufacturing an implantable prosthesis comprising:
forming a first pattern defining a helical winding having a plurality of sections circumscribing an axis from a first end to a second end, wherein the sections include a first end section at the first end, a second end section at the second end, and one or more central sections disposed between the first end and the second end; the sections are spaced apart along the axis; and the sections include a plurality of struts joined together defining a vertex between two struts, wherein a vertex of the first or second end sections is an end vertex formed by joining two final struts of the first or second end sections, and a bridge of a plurality of bridges connects one section to another section; and
forming a second pattern defining a ring having a plurality of extensions connected to the helical winding, wherein an extension connects to the end vertex, the two final struts are joined together to define the end vertex, the two final struts have an end strut length, and the end strut length is different from a range of strut lengths of the one or more central sections.
12. The method according to claim 11 , wherein a bridge of the plurality of bridges has a minimum width greater than a width of any of the plurality of the struts.
13. The method according to claim 11 , wherein the helical winding comprises a single helical winding.
14. The method according to claim 11 , wherein the helical winding comprises a plurality of separate helical windings connected to each other.
15. The method according to claim 11 , wherein the bridge of the plurality of bridges extends parallel to the axis.
16. The method according to claim 11 , wherein the bridge of the plurality of bridges extends obliquely to the axis.
17. The method according to claim 11 , wherein the bridge of the plurality of bridges directly connects a peak of one section to a peak of another section.
18. The method according to claim 11 , wherein the bridge of the plurality of bridges directly connects a peak of one section to a trough of another section.
19. The method according to claim 11 , wherein the bridge of the plurality of bridges directly connects a trough of one section to a trough of another section.
20. The method according to claim 11 , wherein a strut of the plurality of struts has a width of approximately 80% of a width of a bridge.