Multilayer Sheet Stent

• US 20080071346A1
• Filed: 06/26/2007
• Published: 03/20/2008
• Est. Priority Date: 09/14/2006
• Status: Abandoned Application

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Brown, Brian J.
• Application Number:
  US11/768,304
• Publication Number:
  US 20080071346A1
• Time in Patent Office: Days
• US Class Current: 623/1.15
• CPC Class Codes: A61F 2/852 Two or more distinct overlapping stents
• 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 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/92 Stents in the form of a rolled-up sheet expanding after insertion into the vessel , e.g. with a spiral shape in cross-section
• 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 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/9155 Adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

A rolled sheet multilayer stent having an unrolled state, an outer surface layer, and an inner surface layer and comprising a first sheet and a second sheet. The first and second sheets each have a first edge and at least one cell design comprising a plurality of struts which form a plurality of cells. When the rolled sheet multilayer stent is in an unrolled state, the first and second sheets lay on top of one another so that the first edge of the first sheet and the first edge of the second sheet form a first edge of the rolled sheet multilayer stent. When the rolled sheet multilayer stent is in a rolled state, the first edge of the first sheet is opposite from the second edge of the first sheet and the first edge of the second sheet is opposite from the second edge of the second sheet. The first sheet has a first circumferential length and the second sheet has a second circumferential length where the first circumferential length is greater than the second circumferential length.

Claims

1. A rolled sheet multilayer stent, the rolled sheet multilayer stent having an unrolled state, a rolled state, an outer surface layer, and an inner surface layer, the rolled sheet multilayer stent comprising a first sheet and a second sheet, the first and second sheets each having a first edge, a second edge and at least one cell design, the at least one cell design comprising a plurality of struts forming a plurality of cells, in the unrolled state the first and second sheets lay on top of one another so that the first edge of the first sheet and the first edge of the second sheet form a first edge of the rolled sheet multilayer stent, in the rolled state the first edge of the first sheet opposite from the second edge of the first sheet and the first edge of the second sheet opposite from the second edge of the second sheet, the first sheet having a first circumferential length, the second sheet having a second circumferential length, the first circumferential length greater than the second circumferential length.

2. The stent of claim 1, the rolled sheet multilayer stent having a proximal end and a distal end, the first sheet forming a substantial portion of the outer surface layer of the rolled sheet multilayer stent, the second sheet forming a substantial portion of the inner surface layer, the first sheet and the second sheet each having a proximal end and a distal end, the proximal end of the first sheet forming the proximal end of the rolled sheet multilayer stent, the distal end of the second sheet forming the distal end of the rolled sheet multilayer stent, the distal end of the first sheet proximal to the distal end of the second sheet and the proximal end of the second sheet distal to the proximal end of the first sheet.

3. The stent of claim 1, the at least one cell design of the first and the second sheets selected from at least one member of the group consisting of closed cell, open cell, free-form cell and any combination thereof.

4. The stent of claim 3, the first and second sheets each having a cell design, the cell design of the first sheet different from the cell design of the second sheet.

5. The stent of claim 4, the cell design of the first sheet an open cell design and the cell design of the second sheet a closed cell design.

6. The stent of claim 3, the first and second sheets having the same cell design.

7. The stent of claim 3, the rolled sheet multilayer stent having a cell design comprising a plurality of cells, the plurality of cells of the rolled sheet multilayer stent smaller than the plurality of cells of either the first sheet or the second sheet.

8. The stent of claim 3, the first and second sheet each having two cell designs, a first cell design in a first section of the sheet, a second cell design in a second section of the sheet, the first section and the second section of the sheet separated by a circumferential strut.

9. The stent of claim 8, the first cell design of the first sheet an open cell design, the second cell design of the first sheet a closed cell design, the first cell design of the second sheet a closed cell design, and the second cell design of the second sheet an open cell design.

10. The stent of claim 9, the first cell design of the first sheet the same as the second cell design of the second sheet and the second cell design of the first sheet the same as the first cell design of the first sheet.

11. The stent of claim 1, at least one of the first sheet and the second sheet delivering a therapeutic agent selected from at least one member of the group consisting of a non-genetic therapeutic agent, a genetic therapeutic agent, cellular material, a polymer agent, and any combination thereof.

12. The stent of claim 11, the first sheet and the second sheet delivering different therapeutic agents.

13. The stent of claim 1, the outer surface layer of the rolled sheet multilayer stent being microporous.

14. A rolled sheet multilayer stent, the rolled sheet multilayer stent having an outer surface layer, an outer diameter, an inner surface layer, an inner diameter, a proximal end, and a distal end, the rolled sheet multilayer stent comprising a first sheet, a second sheet, a third sheet and a fourth sheet, the first sheet forming a substantial portion of the outer surface layer, the fourth sheet forming a substantial portion of the inner surface layer, the first, second, third and fourth sheets each having at least one cell design, the at least one cell design comprising a plurality of struts forming a plurality of cells,

15. The stent of claim 14, the first, second, third and fourth sheets each having a proximal end and a distal end, the proximal end of the first sheet forming the proximal end of the rolled sheet multilayer stent, the distal end of the first sheet proximal to the distal end of the second sheet, the distal end of the second sheet proximal to the third sheet and distal to the first sheet, the distal end of the third sheet proximal to the fourth sheet and distal to the second sheet, the distal end of the fourth sheet forming the distal end of the rolled sheet multilayer stent, the proximal end of the second sheet distal to the proximal end of the first sheet, the proximal end of the third sheet distal to the proximal end of the second sheet, the proximal end of the fourth sheet distal to the proximal end of the third sheet, the rolled sheet multilayer stent having a taper such that the outer and inner diameters of the proximal end of the rolled sheet multilayer stent greater than the outer and inner diameters of the distal end of the rolled sheet multilayer stent.