Stent for placement at luminal os

• US 20040204754A1
• Filed: 03/23/2004
• Published: 10/14/2004
• Est. Priority Date: 04/14/2003
• Status: Active Grant

• Current Assignee: Poseidon Medical Inc.
• Original Assignee: Anvil Medical, Inc.
• Inventors: Kaplan, Aaron V., Vargas, Jaime
• Granted Patent: US 7,481,834 B2
• Time in Patent Office: Days
• US Class Current: 623/1.16
• CPC Class Codes: A61F 2/852 Two or more distinct overlapping stents
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• 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 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2002/8486 provided on at least one of the ends
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2250/006 modular

Abstract

A prosthesis includes a radially expansible scaffold in at least two circumferential anchors extending from the scaffold. The prosthesis is placed across an os between a main body lumen and a branch lumen. The scaffold is expanded within the branch lumen and the circumferential anchors deformed outwardly to conform to the wall of the main body lumen. Optionally, a second prosthesis may be placed within the main body lumen after the first prosthesis has been deployed.

Claims

1. A prosthesis for placement at an os opening from a main body lumen to a branch body lumen;

said prosthesis comprising;

a radially expansible scaffold; and

at least two circumferential anchors extending axially from an end of the scaffold, said anchors adapted to extend axially into and expandably circumscribe at least one-half of the main vessel wall when the scaffold is implanted in the branch lumen with said one end adjacent the os.

2. A prosthesis as in claim 1, comprising at least three circumferential anchors extending axially from the end of the scaffold.

3. A prosthesis as in claim 1, wherein the anchors have an axial length which is at least 1.5 times the width of the scaffold prior to radial expansion.

4. A prosthesis as in claim 1, wherein the anchors have an axial length of at least 2 mm.

5. A prosthesis as in claim 1, wherein the scaffold comprises a plurality of axially adjacent cells.

6. A prosthesis as in claim 1, wherein the circumferential anchors are all congruent.

7. A prosthesis as in claim 1, wherein the circumferential anchors will radially expand when the scaffold is radially expanded.

8. A prosthesis as in claim 1, wherein the circumferential anchors are adapted to both bend and rotate relative to a control axis of the prosthesis.

9. A prosthesis as in claim 1, further comprising a radiopaque marker at or near a transition location between the scaffold and the circumferential anchors.

10. A prosthesis as in claim 1, mounted on a balloon wherein the balloon has a radiopaque marker aligned with a transition location between the scaffold and the circumferential anchors.

11. A method for deploying a prosthesis across an os opening from a main body lumen to a branch body lumen, said method comprising:

positioning the prosthesis so that a scaffold lies within the branch body and at least two circumferential anchors extend into the main body lumen;

radially expanding the scaffold to implant said scaffold in the branch body lumen; and

circumferentially deforming the anchors to circumscribe at least a portion of the main vessel wall and open a passage through the anchors.

12. A method as in claim 11, wherein at least three circumferential anchors extend into the main body lumen.

13. A method as in claim 11, wherein positioning the prosthesis comprises aligning a visible marker on at least one of the prosthesis and a delivery balloon with the os.

14. A method as in claim 11, wherein the lumens are blood vessels.

15. A method as in claim 11, wherein the scaffold is expanded with a balloon expanded within the scaffold.

16. A method as in claim 15, wherein the anchors are deformed by expanding a balloon positioned transversely through the anchors.

17. A method as in claim 16, wherein the scaffold and anchors are expanded and deformed by the same balloon.

18. A method as in claim 16, wherein the scaffold and anchors are expanded and deformed by different balloons.

19. A method as in claim 11, further comprising deploying a second prosthesis within the passage through the anchors.

20. A method as in claim 19, wherein the second prosthesis is deployed by a balloon catheter exchanged over a guidewire pre-positioned for deformation of the anchors.

21. A method as in claim 19, wherein the anchors are deformed by deployment of the second prosthesis.

22. A method as in claim 19, wherein the deployed second stent supports the anchors over their lengths from the os over the main body lumen wall.