Balloon expandable stent with a self-expanding portion

• US 6,168,621 B1
• Filed: 05/29/1998
• Issued: 01/02/2001
• Est. Priority Date: 05/29/1998
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Vrba, Anthony C.
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): Jackson, Suzette
• Application Number:
  US09/087,526
• Time in Patent Office: 949 Days
• Field of Search: 623/1, 623/12, 623/1.25, 623/1.31, 623/1.3, 623/1.35, 623/1.2, 623/1.15, 606/198
• US Class Current: 623/1.2
• 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 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/821 Ostial stents
• 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 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2250/0048 differing in mechanical expandability, e.g. in mechanical, self- or balloon expandability

Abstract

A stent consisting of at least two parts in juxtaposition, one part being of self-expandable characteristics while the other part is balloon expandable.

Claims

1. A stent for transluminal implantation comprised of a trunk and at least two joined cylindrical parts extending from the trunk, one part being capable of radially self-expanding, the other part being radially expandable only by means of a force applied thereto.

2. The stent of claim 1 wherein the two parts are in juxtaposition.

3. The stent of claim 1 wherein the other part is balloon expandable.

4. The stent of claim 1 wherein the one part is comprised of nitinol.

5. The stent of claim 1 wherein the one part comprises a proximal portion of the stent.

7. The stent of claim 1 wherein the trunk further comprises a first end and a second end, the one part extending from the first end, the other part extending from the second end.

8. The stent of claim 1 wherein the trunk is balloon expandable.

9. The stent of claim 1 wherein the trunk is self-expandable.

10. The stent of claim 1 wherein

the one part comprises a first undulating band having alternating peaks and troughs, the first undulating band comprising interconnected struts of a first length and

the other part comprises a second undulating band having alternating peaks and troughs, the second undulating band comprising interconnected struts of a second length, the first length greater than the second length.

6. A stent for transluminal implantation comprised of a trunk and at least two joined cylindrical parts extending from the trunk, one part being capable of radially self-expanding, the other part being radially expandable only by means of an interior radial force wherein the one part comprises a proximal portion of the stent and wherein the one part is flared with respect to the rest of the stent when in the expanded condition.

11. An expandable bifurcated stent comprising

a trunk,

a first branch and

a second branch,

the first branch and the second branch each extending from the trunk, the stent comprising

a self-expanding portion and

a portion which requires the application of a force thereto to expand wherein

the self-expanding portion comprises at least one of the trunk, the first branch and the second branch, and

the portion which requires the application of a force thereto to expand comprises at least one of the trunk, the first branch and the second branch.

12. The stent of claim 11 wherein the portion which requires the application of a force thereto to expand comprises a plurality of interconnected undulating bands having alternating peaks and troughs, and a plurality of curved interconnecting elements extending between adjacent bands.

13. The stent of claim 12 wherein the curved interconnecting elements are substantially U-shaped.

14. The stent of claim 11,

the portion which requires the application of a force thereto to expand comprising a first undulating band having alternating peaks and troughs, and

the portion which requires the application of a force thereto to expand comprising a second undulating band having alternating peaks and troughs,

wherein the portion which self expands is connected to the portion which requires the application of a force thereto by interconnecting elements, each interconnecting element extending from a peak on a first undulating band to a trough on a second undulating band.