Stent having helical elements

• US 8,486,133 B2
• Filed: 02/07/2008
• Issued: 07/16/2013
• Est. Priority Date: 06/13/1997
• Status: Expired due to Fees

• Current Assignee: OrbusNeich Medical Pte Ltd
• Original Assignee: Orbusneich Medical Incorporated (Orbusneich Medical)
• Inventors: Addonizio, Scott J., Camp, David L. Jr., Becker, Gary J., Pazienza, John D.
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): Ganesan, Suba
• Application Number:
  US12/027,382
• Publication Number:
  US 20090024207A1
• Time in Patent Office: 1,986 Days
• Field of Search: 623/1.15, 623/1.22, 623/1.1, 623/1.16, 623/1.17, 623/1.18, 623/1.2, 623/1.34, 623/23.7
• US Class Current: 623/1.16
• 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 the comprises at least two 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 a longitudinal axis and comprising:

a plurality of expandable helical segments that each consist of a plurality of substantially S-shaped portions alternating with a plurality of connecting segments, each S-shaped portion including a plurality of linear segments, wherein at least one linear segment is nonparallel with respect to the longitudinal axis, wherein each of the plurality of helical segments extends across substantially the entire length of the stent,

each connecting segment including two substantially parallel segments connected by a substantially perpendicular segment, wherein the parallel segments are nonparallel with respect to the longitudinal axis; and

a plurality of cylindrical elements being adjacent to one another and being attached to one another by the helical segments, each cylindrical element comprising;

a circumference that is substantially identical to that of an adjacent cylindrical element and substantially perpendicular to the longitudinal axis; and

a plurality of circumferential segments joined together by portions of the helical segments, the circumferential elements having a different rotational orientation than an orientation of the S-shaped portions.

2. The expandable stent of claim 1, wherein the stent is in an unexpanded state.

3. The expandable stent of claim 1, wherein the stent is in an expanded state.

4. The expandable stent of claim 1, wherein the circumferential elements are inversions of the S-shaped portions.

5. An expandable stent having a longitudinal axis and comprising:

a plurality of expandable helical segments that each consist of a plurality of substantially S-shaped portions alternating with a plurality of connecting segments, each S-shaped portion including a plurality of linear segments, wherein at least one linear segment is nonparallel with respect to the longitudinal axis, wherein each of the plurality of helical segments extends across substantially the entire length of the stent,

each connecting segment including two substantially parallel segments connected by a substantially perpendicular segment, wherein the parallel segments are nonparallel with respect to the longitudinal axis; and

a plurality of cylindrical elements being adjacent to one another and being attached to one another by the helical segments, each cylindrical element comprising;

a circumference that is substantially identical to that of an adjacent cylindrical element and substantially perpendicular to the longitudinal axis; and

a plurality of circumferential segments joined together by portions of the helical segments, the circumferential elements each having an inverted substantially S-shape.

6. The expandable stent of claim 5, wherein the stent is in an unexpanded state.

7. The expandable stent of claim 5, wherein the stent is in an expanded state.

8. An expandable stent having a longitudinal axis and comprising:

a plurality of expandable helical segments that each consist of a plurality of substantially S-shaped portions alternating with a plurality of connecting segments, each S-shaped portion including a plurality of linear segments, wherein at least one linear segment is nonparallel with respect to the longitudinal axis, wherein each of the plurality of helical segments extends across substantially the entire length of the stent,

each connecting segment including two substantially parallel segments connected by a substantially perpendicular segment, wherein the parallel segments are nonparallel with respect to the longitudinal axis; and

a plurality of cylindrical elements being adjacent to one another and being attached to one another by the helical segments, each cylindrical element comprising;

a circumference that is substantially identical to that of an adjacent cylindrical element and substantially perpendicular to the longitudinal axis; and

a plurality of circumferential segments joined together by portions of the helical segments, the circumferential elements having a different shape than the S-shaped portions.

9. The expandable stent of claim 8, wherein the stent is in an unexpanded state.

10. The expandable stent of claim 8, wherein the stent is in an expanded state.