Stent

• US 8,834,559 B2
• Filed: 02/28/2006
• Issued: 09/16/2014
• Est. Priority Date: 03/23/2005
• Status: Active Grant

• Current Assignee: ADMEDES Schuessler GmbH
• Original Assignee: ADMEDES Schuessler GmbH
• Inventors: Mailander, Werner, Flaxmeier, Erik, Steiner, Ralph, Scherrible, Frank
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): SCHILLINGER, ANN M
• Application Number:
  US11/365,470
• Publication Number:
  US 20060217799A1
• Time in Patent Office: 3,122 Days
• Field of Search: 623/1.13, 623/1.16, 623/1.27, 623/1.34, 623/1.44, 623/1.45, 623/1.46, 623/900, 623/901, 623/902, 623/903, 623/1.18, 623/1.19
• US Class Current: 623/1.34
• 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 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91558 connected peak to peak

Abstract

The present invention relates to an aneurysm stent for implantation into a living body, in particular for treatment of aneurysms, in order to implant the stent in the compressed state in a vessel and expand the stent after positioning it in the vessel, having a grid or mesh structure and at least one membrane (2) or a plurality of membranes (2) for covering at least one or more stent cells (1; 3) in the grid or mesh structure, thereby matching the permeation characteristics of the stent structure to the particular characteristics of the aneurysm.

Claims

1. An aneurysm stent for implantation into a living body for the treatment of aneurysms, the stent comprising:

a compressed state for positioning the stent in a vessel and an expanded state for treating the aneurysm, the aneurysm stent having a grid or mesh structure comprising non-covered stent cells and covered stent cells, wherein the stent cells are compressed when the stent is in the compressed state, wherein each covered stent cell contains a membrane, the membrane having a non-porous or closed structure to reduce fluid permeability in a region of the membrane, and wherein each entire membrane is provided in the corresponding covered stent cell within a thickness of that stent cell so that each membrane does not project beyond a thickness of the grid or mesh structure.

2. An aneurysm stent according to claim 1, wherein the membrane is less thick than the web thickness of the corresponding covered stent cell.

3. An aneurysm stent according to claim 1, wherein the membrane has essentially the same thickness as the web thickness of the corresponding covered stent cell.

4. An aneurysm stent according to claim 1, wherein the membrane includes a polymer.

5. An aneurysm stent according to claim 1, wherein the membrane is attached to webs of the corresponding covered stent cell by adhesion.

6. An aneurysm stent according to claim 1, wherein the membrane includes an X-ray-visible material.

7. An aneurysm stent according to claim 1, wherein the membrane is filled with a medication.

8. An aneurysm stent according to claim 1, wherein a plurality of stent cells in a uniform row or in a uniform pattern is covered by the membrane.

9. An aneurysm stent according to claim 1, wherein at least one covered stent cell is positioned adjacent to a non-covered stent cell.

10. An aneurysm stent according to claim 1, wherein a plurality of the non-covered stent cells are interconnected.

11. An aneurysm stent according to claim 1, wherein the stent structure has a tubular shape.

12. A method for producing an aneurysm stent, the method comprising:

preparing a stent structure from a material having shape memory characteristics with webs, the stent structure having first and second stent cells formed between the webs, the stent structure compressible into a compressed state in which the stent cells are compressed; and

in each of the first stent cells, attaching a membrane to the webs of the first stent cell such that the second stent cells are not covered by the membrane, each membrane having a non-porous or closed structure to reduce fluid permeability in a region of the membrane, and wherein each entire membrane is provided in the corresponding first stent cell within a web thickness of the corresponding first stent cell so that the membrane does not project beyond the stent structure.

13. A method according to claim 12, wherein the membrane is attached to the webs by adhesion.

14. A method according to claim 12, wherein the membrane is filled with a medication.

15. A method according to claim 12, wherein the membrane is provided with an X-ray-visible material.

16. A method according to claim 12, wherein the stent structure has a tubular shape.