STENT HAVING HELICAL ELEMENTS

• US 20080288052A1
• Filed: 07/24/2008
• Published: 11/20/2008
• 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:
  US12/178,909
• Publication Number:
  US 20080288052A1
• 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. An expandable stent having an unexpanded state, the unexpanded stent comprising:

a body defining a cylindrical axis, the body including a helical segment having a substantially H-shaped portion defining two generally parallel linear portions being angled with respect to the cylindrical axis, the helical segment including a substantially S-shaped portion defining at least one generally linear portion being angled with respect to the cylindrical axis.

2. The stent of claim 1, wherein the angle between the linear portions of the H-shaped segment and the cylindrical axis is greater than 0 degrees.

3. The stent of claim 2, wherein the angle between the linear portions of the H-shaped segment and the cylindrical axis is less than 90 degrees.

4. The stent of claim 1, wherein the angle between the linear portion of the S-shaped portion and the cylindrical axis is greater than 0 degrees.

5. The stent of claim 4, wherein the angle between the linear portion of the S-shaped portion and the cylindrical axis is less than 90 degrees.

6. The stent of claim 1, further comprising a plurality of cylindrical elements disposed about the cylindrical axis.

7. The stent of claim 6, wherein each cylindrical element comprises:

(1) a first plurality of the expandable circumferential segments and (2) a second plurality of circumferential segments, wherein the first and second pluralities of circumferential segments are joined to each other by at least one of the S-shaped portion and H-shaped segment.

8. The stent of claim 7, wherein the first and second pluralities of circumferential segments comprise a majority of the circumference of each cylindrical element.

9. The stent of claim 7, wherein the first circumferential segments alternate with the second circumferential segments.

10. An expandable stent having an unexpanded state, the unexpanded stent comprising:

a cylindrical main body defining a cylindrical axis, the main body including a plurality of helical segments, each helical segment including a substantially H-shaped segment defining two generally parallel linear portions being angled with respect to the cylindrical axis, each helical segment including a substantially S-shaped segment defining at least one generally linear portion being angled with respect to the cylindrical axis.

11. The stent of claim 10, wherein the angle between the linear portions of the H-shaped segment and the cylindrical axis is greater than 0 degrees.

12. The stent of claim 11, wherein the angle between linear portions of the H-shaped segment and the cylindrical axis is less than 90 degrees.

13. The stent of claim 10, wherein each helical segment includes a plurality of substantially S-shaped segments alternating with a plurality of substantially H-shaped segments.

14. An expandable stent having an unexpanded state, the unexpanded stent comprising:

a main body having a plurality of cylindrical elements disposed about a cylindrical axis, the main body including a helical segment including a substantially S-shaped segment and a substantially H-shaped segment, the H-shaped segment defining two generally parallel linear portions nonparallel to the cylindrical axis.

15. The stent of claim 14, the linear portions are not perpendicular to the cylindrical axis.

16. The stent of claim 14, wherein each helical segment includes a plurality of substantially S-shaped segments alternating with a plurality of substantially H-shaped segments.

17. The stent of claim 14, wherein each cylindrical element comprises:

(1) a first plurality of the expandable circumferential segments and (2) a second plurality of circumferential segments, wherein the first and second pluralities of circumferential segments are joined to each other by at least one of the S-shaped portion and H-shaped segment.

18. The stent of claim 17, wherein the first and second pluralities of circumferential segments comprise a majority of the circumference of each cylindrical element.

19. The stent of claim 18, wherein the first circumferential segments alternate with the second circumferential segments.