Stent and method for the production of such a stent
A stent having a tubular lattice structure includes lattice elements, webs ( 10 ), and cells ( 11 ) delimited by the lattice elements. The lattice structure is transferred into a compressed state having a relatively smaller cross-sectional diameter and into an expanded state having a relatively larger cross-sectional diameter. Flexible contact elements ( 12 ) are associated with the lattice elements. The contact elements are adapted for transferring radial forces onto a vessel wall ( 20 ) and extending on the outer circumference of the lattice structure substantially in the longitudinal direction of each associated lattice element. The contact elements ( 12 ) are wider in each case than the associated lattice elements, at least in sections.
1. A stent having a tubular lattice structure, comprising:
a plurality of lattice elements ( 10 ) and cells ( 11 ) delimited by the lattice elements, wherein the lattice structure is transferred into a compressed state having a relatively smaller cross-sectional diameter and into an expanded state having a relatively larger cross-sectional diameter, and
a plurality of discrete flexible contact elements ( 12 ) adapted for transferring radial forces onto a vessel wall ( 20 ), wherein each discrete flexible contact element ( 12 ) is associated with a respective different lattice element ( 10 ), each flexible contact element ( 12 ) extending on an outer circumference of the respective associated lattice element ( 10 ) in a longitudinal direction of the lattice element ( 10 ), and each flexible contact element ( 12 ) being wider than the respective associated lattice element ( 10 ), at least in sections.
2. The stent according to claim 1 , wherein the lattice elements in each case together with an associated contact element ( 12 ) form a substantially T-shaped or L-shaped cross-section, at least in sections.
3. The stent according to claim 1 , wherein the contact elements ( 12 ) are in each case wider than each associated lattice element by at least 10%.
4. The stent according to claim 1 , wherein the contact elements ( 12 ) are in each case wider than each associated lattice element by at most 500%.
5. The stent according to claim 1 , wherein a width of one or a plurality of contact elements ( 12 ) is variable over a circumference and/or a length of the stent.
6. The stent according claim 1 , wherein the cells ( 11 ) of the lattice structure each have an opening ( 13 ), which is delimited by the contact elements ( 12 ) of the lattice elements that form each cell ( 11 ).
7. The stent according to claim 6 , wherein the openings ( 13 ) are adapted in each case to the contour of the cell ( 11 ).
8. The stent according to claim 6 , wherein the openings ( 13 ) are substantially diamond-shaped.
9. The stent according to claim 8 , wherein the contact elements ( 12 ) each have at least one longitudinal edge ( 15 ) which extends parallel to a longitudinal axis of each associated lattice element.
10. The stent according to claim 9 , wherein the contact elements ( 12 ) each have at least one longitudinal edge ( 15 ) which is disposed at an angle to the longitudinal axis of each associated lattice element.
11. The stent according to claim 10 , wherein the contact elements ( 12 ) each have two longitudinal edges ( 15 ) which are disposed parallel to one another and/or are disposed at an angle to a longitudinal axis of each associated lattice element.
12. The stent according to claim 11 , wherein the contact elements ( 12 ) form substantially rectangular strips which are substantially disposed diagonally to each associated lattice element.
13. The stent according to claim 12 , wherein the contact elements ( 12 ) are joined so as to be overlapping and/or adjacent to each other in corner regions of the cells ( 11 ) or are joined to each other.
14. The stent according to claim 13 , wherein the contact elements ( 12 ) have a height between 0.5 μm and 100 μm.
15. The stent according to claim 14 , wherein the height of the contact elements ( 12 ) corresponds to at least 0.5% of the height of each associated lattice element.
16. The stent according to claim 15 , wherein the height of the contact elements ( 12 ) corresponds to at most 50% of the height of each associated lattice element.
17. The stent according to claim 16 , wherein the height of one and/or a plurality of contact elements ( 12 ) is variable over a circumference and/or a length of the stent.
18. The stent according to claim 17 , wherein the height of one and/or a plurality of contact elements ( 12 ) is variable over a width and/or a length of the contact elements ( 12 ).
19. The stent according to claim 18 , wherein one and/or a plurality of contact elements ( 12 ) has a greater height in a region of each associated lattice element than in an outer region.
20. The stent according to claim 19 , wherein the contact elements ( 12 ) comprise a shape memory material of a nickel-titanium alloy.
21. The stent according to claim 20 , wherein the contact elements ( 12 ) have a structured surface of pores or grooves.
22. A method for the production of a stent according to claim 1 , in which the flexible contact elements ( 12 ) are joined with the lattice elements or are produced integrally with the lattice elements in such a manner that at least one of the contact elements ( 12 ) is associated in each case with a lattice element, the contact element protruding beyond the lattice element's cross-section.
23. The method according to claim 22 , wherein the contact elements ( 12 ) are joined to the lattice elements by means of laser beam micro welding.
24. The method according to claim 22 , wherein the contact elements ( 12 ) are bonded to the lattice elements.
25. The method according to claim 22 , wherein the contact elements ( 12 ) are produced by means of magnetron sputtering or ion beam sputtering.