Intravascular stent with non-parallel slots

• US 5,948,016 A
• Filed: 09/25/1997
• Issued: 09/07/1999
• Est. Priority Date: 09/25/1997
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Jang G. David
• Inventors: Jang, G. David
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): Black, John M.
• Application Number:
  US08/936,297
• Time in Patent Office: 712 Days
• Field of Search: 623/1, 623/11, 623/12, 606/192, 606/194, 606/195, 606/198
• US Class Current: 623/1.11
• 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 2002/91525 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 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped

Abstract

A stent in a non-expanded state includes a first expansion column having a plurality of first expansion column slots that are formed of a plurality of first expansion struts. Substantially each first column expansion slot has a longitudinal axis. A second expansion column has a plurality of second expansion column slots that are formed of a plurality of second expansion struts. Substantially each second expansion column strut has a longitudinal axis. A first connecting strut column is formed of a plurality of first connecting struts. The first connecting strut column couples the first expansion column to the second expansion column. The first expansion column, second expansion column and the first connecting strut column form a first tubular structure with a longitudinal axis. The longitudinal axis of the first expansion column slots is non-parallel to the longitudinal axis of the first tubular structure.

Claims

1. A stent in a non-expanded state, comprising:

a first expansion column including a plurality of first expansion column slots formed of a plurality of first expansion struts, each of a first expansion strut being coupled to an adjacent first expansion strut by a substantially linear joining strut, the first expansion column slots having a longitudinal axis;

a second expansion column including a plurality of second expansion column slots formed of a plurality of second expansion struts, each of a second expansion strut being coupled to an adjacent second expansion strut by a substantially linear joining strut, the second expansion column slots having a longitudinal axis; and

a first connecting strut column formed of a plurality of first connecting struts, the first connecting strut column coupling the first expansion column to the second expansion column, wherein the first expansion column, the second expansion column and the first connecting strut column form a first tubular structure with a longitudinal axis, and the longitudinal axis of the first expansion column slots is non-parallel to the longitudinal axis of the first tubular structure.

2. The stent of claim 1, wherein the longitudinal axis of the second expansion slots is non-parallel to the longitudinal axis of the first tubular structure.

3. The stent of claim 1, wherein the longitudinal axis of the slots in the first expansion column is parallel to the longitudinal axis of the slots in the second expansion column.

4. The stent of claim 1, wherein at least one first connecting strut connects the first expansion column to the second expansion column.

5. The stent of claim 1, wherein a width of a first expansion column slot of the first expansion column is different from a width of a second adjacent expansion column slot of the first expansion column.

6. The stent of claim 1, wherein at least a portion of the substantially linear joining struts in the first and second expansion columns has a curved proximal end.

7. The stent of claim 1, wherein at least a portion of the substantially linear joining struts in the first and second expansion columns has a curved distal end.

8. The stent of claim 1, wherein at least a portion of the substantially linear joining struts in the first and second expansion columns has a curved proximal end and a curved distal end.

9. The stent of claim 1, wherein a longitudinal axis of the first connecting struts of the first connecting strut column is non-parallel to the longitudinal axis of the first tubular structure.

10. A slotted stent in a non-expanded state, comprising:

a first expansion column including a plurality of parallel first expansion column slots formed of a plurality of first expansion struts, the first expansion column slots having a longitudinal axis;

a second expansion column including a plurality of parallel second expansion column slots formed of a plurality of second, expansion struts, the second expansion column slots having a longitudinal axis; and

a first connecting strut column formed of a plurality of first connecting struts, the first connecting strut column coupling the first expansion column to the second expansion column, wherein the first expansion column, the second expansion column and the first connecting strut column form a first tubular structure with a longitudinal axis and a plurality of closed geometric cells formed by adjacent first expansion struts, adjacent second expansion struts and adjacent first connecting struts, at least a portion of the plurality of closed geometric cells being asymmetrical closed geometric cells, the longitudinal axis of the first expansion column slots being non-parallel to the longitudinal axis of the first tubular structure.

11. The stent of claim 10, wherein a longitudinal axis of the first connecting struts of the first connecting strut column is non-parallel to the longitudinal axis of the first tubular structure.

12. The stent of claim 10, wherein the longitudinal axis of the first expansion column slots is parallel to the longitudinal axis of the second expansion column slots.

13. The stent of claim 10, wherein the longitudinal axis of the second expansion slots is non-parallel to the longitudinal axis of the first tubular structure.

14. The stent of claim 10, wherein at least one first connecting strut connects the first expansion column to the second expansion column.

15. The stent of claim 10, wherein a width of a first expansion column slot of the first expansion column is different from a width of a second adjacent expansion column slot of the first expansion column.

16. A stent assembly, comprising:

a balloon; and

an unexpanded stent mounted at an exterior of the balloon, the stent including a first expansion column including a plurality of first expansion column slots formed of a plurality of first expansion struts, the first expansion column slots having a longitudinal axis, each of a first expansion strut being coupled to an adjacent first expansion strut by a substantially linear joining strut;

a second expansion column including a plurality of second expansion column slots formed of a plurality of second expansion struts, the second expansion column slots having a longitudinal axis each of a second expansion strut being coupled to an adjacent second expansion strut by a substantially linear joining strut;

a first connecting strut column formed of a plurality of first connecting struts, the first connecting strut column coupling the first expansion column to the second expansion column, wherein the first expansion column, the second expansion column and the first connecting strut column form a first tubular structure with a longitudinal axis that is non-parallel to the longitudinal axis of the first expansion column slots prior to the stent being mounted on the balloon.

17. The stent assembly of claim 16, wherein the longitudinal axis of the second expansion slots is non-parallel to the longitudinal axis of the first tubular structure.

18. The stent assembly of claim 16, wherein at least one first connecting strut connects the first expansion column to the second expansion column.

19. The stent assembly of claim 16, wherein the balloon has a tapered geometry in an expanded state.

20. The stent assembly of claim 16, wherein the balloon is curved extending from a proximal end and a distal end in an expanded state.