STENT HAVING HELICAL ELEMENTS

• US 20080281406A1
• Filed: 07/24/2008
• Published: 11/13/2008
• Est. Priority Date: 06/13/1997
• Status: Abandoned Application

• Current Assignee: OrbusNeich Medical Pte Ltd
• Original Assignee: Orbusneich Medical Incorporated (Orbusneich Medical)
• Inventors: CAMP, David L. JR., BECKER, Gary J., PAZIENZA, John D., ADDONIZIO, Scott J.
• Application Number:
  US12/178,883
• Publication Number:
  US 20080281406A1
• Time in Patent Office: Days
• US Class Current: 623/1.22
• 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 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• 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 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/9155 Adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91583 by a bridge, whereby at least one of its ends is connected along the length of a strut between two consecutive apices within a band
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped

Abstract

An expandable stent comprised of a plurality of helical segments is disclosed. In one embodiment, the stent is generally cylindrical in shape having a cylindrical axis, and comprises a first and second set of helical segments. The helical segments in the first set are substantially parallel and have a first pitch forming a first helical angle with respect to the cylindrical axis. The helical segments in the second set are also generally parallel to each other and form a second pitch that differs from the first pitch, thereby forming a second helical angle with respect to the cylindrical axis. In an alternative embodiment, the stent comprises one set of helical segments and a plurality of circumferential elements that are joined together by the helical segments to form a plurality of cylindrical elements which are joined together to form a stent body. The stent may also have endzones.

Claims

1. A stent comprising a main body formed from

a plurality of expandable helical segments that comprise a plurality of a single substantially S-shaped portions and one or more substantially H-shaped segments which connect a plurality of main body cylindrical elements;

said cylindrical elements comprising a plurality of first circumferential segments having a repeating pattern and second circumferential segments comprising the substantially S-shaped portion; and

wherein said S-shaped portion comprises a linear element and a curved element, said linear element lying an acute angle less than or equal to about 45 degrees relative to a cylindrical axis of the main body.

2. The stent of claim 1 wherein the substantially S-shaped portion further comprises an angled portion connected to the linear portion at an end opposite to the curved portion.

3. The stent of claim 2 wherein the angled portion forms an angle relative to the cylindrical axis of the stent greater than 0 degrees to about 45 degrees.

4. The stent of claim 3 wherein the angled portion forms an angle of about 10 degrees.

5. The stent of claim 1 wherein the substantially S-shaped portion has an amplitude ranging from about 0.5 mm to about 2.0 mm and a period ranging from about 0.5 mm to about 2.0 mm.

6. The stent of claim 1 wherein the repeating pattern comprises a sinusoidal wave.

7. The stent of claim 6 wherein the sinusoidal wave has an amplitude ranging from about 0.5 mm to about 2.0 mm and a period ranging from about 0.5 mm to about 2.0 mm.

8. A stent comprising a main body formed from

a plurality of expandable helical segments that comprise a single substantially S-shaped portion and one or more substantially H-shaped segments which connect a plurality of main body cylindrical elements;

said cylindrical elements comprising a plurality of first circumferential segments having a repeating pattern and second circumferential segments having the substantially S-shaped portion;

wherein said S-shaped portion comprises a linear element and a curved element, said linear element lying an acute angle less than or equal to about 45 degrees relative to a cylindrical axis of the main body; and

, wherein said H-shaped segment comprises two generally parallel linear portions connected by a common connecting element, said linear portions lying at an acute angle less than or equal to about 14 degrees relative to the cylindrical axis.

9. The stent of claim 8 wherein the substantially S-shaped portion further comprises an angled portion connected to the linear portion at an end opposite to the curved portion.

10. The stent of claim 9 wherein the angled portion forms an angle relative to the cylindrical axis of the stent greater than 0 degrees to about 45 degrees.

11. The stent of claim 8 wherein the substantially S-shaped portion has an amplitude ranging from about 0.5 mm to about 2.0 mm and a period ranging from about 0.5 mm to about 2.0 mm.

12. The stent of claim 8 wherein the repeating pattern comprises a sinusoidal wave.

13. The stent of claim 12 wherein the sinusoidal wave has an amplitude ranging from about 0.5 mm to about 2.0 mm and a period ranging from about 0.5 mm to about 2.0 mm.

14. A stent comprising a main body formed from

a plurality of expandable helical segments that comprise a plurality of a single substantially S-shaped portions and one or more substantially H-shaped segments which connect a plurality of main body cylindrical elements;

said cylindrical elements comprising a plurality of first circumferential segments having a pattern and second circumferential segments comprising the substantially S-shaped portion; and

, wherein said S-shaped portion comprises a linear element and a curved element, said linear element lying an acute angle less than or equal to about 45 degrees relative to a cylindrical axis of the main body.

15. The stent of claim 14 wherein the pattern is repeating.

16. The stent of claim 15 wherein the repeating pattern comprises peaks and valleys.

17. The stent of claim 16 wherein the repeating pattern is sinusoidal.

18. A stent comprising a main body formed from

a plurality of expandable helical segments that comprise a single substantially S-shaped portion and one or more substantially H-shaped segments which connect a plurality of main body cylindrical elements;

said cylindrical elements comprising a plurality of first circumferential segments having a repeating pattern and second circumferential segments having the substantially S-shaped portion;

and,

wherein said H-shaped segment comprises two generally parallel linear portions connected by a common connecting element, said linear portions lying at an acute angle less than or equal to about 14 degrees relative to the cylindrical axis.