Endoluminal prosthesis and tissue separation condition treatment method

• US 20030225444A1
• Filed: 12/03/2002
• Published: 12/04/2003
• Est. Priority Date: 06/30/2000
• Status: Active Grant

• Current Assignee: LeMaitre Vascular, Incorporated
• Original Assignee: Vascular Architects Incorporated
• Inventors: Fogarty, Thomas J., Klumb, Katherine J., Hill, Bradley B., Kamdar, Kirti P.
• Granted Patent: US 6,921,414 B2
• Time in Patent Office: Days
• US Class Current: 623/1.1
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires

Abstract

An endoluminal prosthesis includes a coiled body and a graft material covering at least part of the coiled body to create a coiled stent graft. The average stent graft diameter to turns width ratio may be about 0.8 to 1 to about 2.4 to 1 when expanded.

Claims

1. An endoluminal prosthesis comprising:

a coiled body;

a graft material covering at least a part of the coiled body to create a coiled stent graft movable between radially expanded and radially contracted conditions;

said coiled stent graft having turns with edges and a width measured perpendicular to said edges, said stent graft placeable in the radially contracted condition for placement and in the radially expanded condition for use;

wherein when in the radially expanded condition, said stent graft has an average stent graft diameter to turns-width ratio from about 0.8 to 1 to about 2.4 to 1.

2. The endoluminal prosthesis according to claim 1 wherein adjacent turns of the coiled stent graft lie adjacent to one another when in the radially expanded condition.

3. The assembly according to claim 1 wherein the coiled stent graft comprises a gap between adjacent turns thereof so to aid placement at the intersection of a branching vessel with a main vessel.

4. The endoluminal prosthesis according to claim 1 wherein the coiled stent graft has at least two full turns when in the radially expanded condition.

5. The endoluminal prosthesis according to claim 1 wherein the coiled stent graft has at most two full turns when in the radially expanded condition.

6. The endoluminal prosthesis according to claim 1 wherein the graft material fully covers the coiled body.

7. The endoluminal prosthesis according to claim 1 wherein the coiled body comprises laterally spaced-apart, longitudinally extending rail elements and transversely extending connector elements connecting the rail elements.

8. The endoluminal prosthesis according to claim 7 comprising at least two of said rail elements.

9. The endoluminal prosthesis according to claim 7 comprising at least the three of said rail elements.

10. The endoluminal prosthesis according to claim 9 wherein said rail elements are parallel to one another and said connector elements are arranged at acute angles to the rail elements so that when in the radially contracted condition, said rail elements extend generally parallel to an axis created by the stent graft.

11. The endoluminal prosthesis according to claim 1 wherein said stent graft comprises a radiopaque marker.

12. An endoluminal prosthesis comprising:

a coiled body;

a graft material covering the coiled body to create a coiled stent graft movable between radially expanded and radially contracted conditions;

said coiled stent graft having turns with edges and a width measured perpendicular to said edges, said stent graft placeable in the radially contracted condition for placement and in the radially expanded condition for use;

adjacent turns of the coiled stent graft lying adjacent to one another when in the radially expanded condition;

said rail elements being parallel to one another and said connector elements being arranged at acute angles to the rail elements so that when in the radially contracted condition, said rail elements extend generally parallel to an axis created by the stent graft; and

wherein when in the radially expanded condition, said stent graft has an average stent graft diameter to turns-width ratio from about 0.8 to 1 to about 2.4 to 1.

13. An endoluminal prosthesis assembly comprising:

a placement catheter comprising a shaft;

an endoluminal prosthesis, releasably mountable to the shaft, comprising;

a coiled body;

a graft material covering at least a part of the coiled body to create a coiled stent graft movable between radially expanded and radially contracted conditions;

said coiled stent graft having turns with edges and a width measured perpendicular to said edges, said stent graft placeable in the radially contracted condition for placement and in the radially expanded condition for use;

wherein when in the radially expanded condition, said stent graft has an average stent graft diameter to turns width ratio from about 0.8 to 1 to about 2.4 to 1; and

the placement catheter comprising a release element having a distal portion engaging at least one of the distal and proximal ends of the stent graft at first and second axially spaced-apart positions at said at least one end so to help maintain said at least one end against the shaft when in the radially contracted condition.

14. An endoluminal prosthesis comprising:

a coiled body;

a graft material covering at least a part of the coiled body to create a coiled stent graft movable between radially expanded and radially contracted conditions;

said coiled stent graft having turns with edges and a width measured perpendicular to said edges, said stent graft placeable in the radially contracted condition for placement and in the radially expanded condition for use;

wherein when in the radially expanded condition, said stent graft has an average turns-width to stent graft length ratio from about 1 to 1 to about 1 to 4.

15. A method for treating a tissue separation condition within a tubular body structure, the tissue separation condition comprising separated tissue defining a gap between the separated tissue and the remainder of the tubular body structure, comprising:

placing an endoluminal prosthesis in a radially contracted condition at a tissue separation condition target site, the endoluminal prosthesis comprising;

a coiled body; and

a graft material covering at least a part of the coiled body to create a coiled stent graft movable between radially expanded and radially contracted conditions, adjacent turns of the coiled stent graft lying adjacent to one another when in the radially expanded condition, said turns having edges and a width measured perpendicular to said edges, said stent graft placeable in the radially contracted condition for placement and in the radially expanded condition for use; and

expanding the stent graft towards the radially expanded condition thereby pressing against the separated tissue to help press the separated tissue against the remainder of the tubular body structure.

16. A method according to claim 15 further comprising obtaining an endoluminal prosthesis so that when in the radially expanded condition, said stent graft has an average stent graft diameter to turns-width ratio from about 0.8 to 1 to about 2.4 to 1.

17. A method according to claim 15 further comprising obtaining an endoluminal prosthesis so that when in the radially expanded condition, said stent graft has an average turns-width to stent graft length ratio from about 1 to 1 to about 1 to 4.

18. A method according to claim 15 wherein the placing step takes place within a vascular structure.

19. A method according to claim 18 wherein the placing step takes place within the aortic arch.

20. A method according to claim 15 wherein the placing step takes place with the target site being an entry opening into a false lumen defined between the separated tissue of a dissection and the remainder of the tubular body structure.

21. A method according to claim 15 wherein the placing step takes place at a dissection site, comprising an entry into and an exit out of a false lumen defined between the separated tissue and the remainder of the tubular body structure, with the target site being the entry.

22. A method according to claim 15 wherein the placing step is carried out using a coiled stent graft having a gap between adjacent turns thereof.

23. A method according to claim 22 further comprising positioning the stent graft at a branching vessel target site with said gap generally aligned with a branching vessel.

24. A method for treating a dissection within the aortic arch of a patient comprising:

obtaining an endoluminal prosthesis;

placing the endoluminal prosthesis within an aortic arch in a radially contracted condition at a target site, the target site being an entry opening into a false lumen, the dissection comprising separated tissue defining the false lumen between the separated tissue and the remainder of the aortic arch, the endoluminal prosthesis comprising;

a coiled body; and

a graft material covering at least a part of the coiled body to create a coiled stent graft movable between radially expanded and radially contracted conditions, adjacent turns of the coiled stent graft lying adjacent to one another when in the radially expanded condition, said turns having edges and a width measured perpendicular to said edges, said stent graft placeable in the radially contracted condition for placement and in the radially expanded condition for use; and

the obtaining step being carried out so that when in the radially expanded condition, said stent graft has an average stent graft diameter to turns width ratio from about 0.8 to 1 to about 2.4 to 1; and

expanding the stent graft towards the radially expanded condition thereby pressing against the separated tissue to help press the separated tissue against the remainder of the tubular body structure.