Extendible stent apparatus

• US 6,835,203 B1
• Filed: 01/07/2002
• Issued: 12/28/2004
• Est. Priority Date: 11/04/1996
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Advanced Stent Technologies Inc. (Boston Scientific Corporation)
• Inventors: Vardi, Gil M., Elam, Eric, Lin, Stuart, Davidson, Charles J.
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): SWEET, THOMAS
• Application Number:
  US09/600,348
• Time in Patent Office: 1,086 Days
• Field of Search: 623/1.11, 623/1.14, 623/1.15, 623/1.16, 623/1.21, 623/1.23, 623/1.34, 623/1.35, 606/108, 606/153, 606/191, 606/198, 606/194
• US Class Current: 623/1.34
• CPC Class Codes: A61F 2/064 with special features to facilitate anastomotic coupling anastomosis of natural blood vessels A61B17/11
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/852 Two or more distinct overlapping stents
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• 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 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/067 modular
• CPC Class Codes: A61F 2002/821 Ostial stents
• 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 2002/9155 Adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• 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 2250/006 modular
• CPC Class Codes: A61F 2250/0098 : radio-opaque, e.g. radio-opaque markers

Abstract

The bifurcating double stent apparatus (10) of the present invention comprises a generally cylindrical main stent (12), a generally cylindrical branch stent (15), which are shown as fully dilated in a subject main vessel (8), and a subject branch vessel (7). The main stent (12) is deployed prior to the branch stent (15) which is then aligned with the side opening (16) of the main stent (12), and attached at that location.

Claims

1. A stent for placement in a bifurcated body lumen having a main branch and a side branch, said stent comprising:

main tubular stent body having a proximal end, a distal end, a lumen therethrough, at least one side opening located between the proximal end and the distal end, and a spine region along a longitudinal axis of the stent body, said spine region having a first axial spine in a proximal portion of said stent and a second axial spine in a distal portion of said stent, said first axial spine having a different strut pattern than said second axial spine.

2. A stent as in claim 1 wherein the first axial spine expands radially in response to a first radially outward force, and the second axial spine expands radially in response to a second radially outward force, wherein the first force is less than the second force.

3. A stent as in claim 1 wherein the first axial spine expands radially in response to a first radially outward force, and the second axial spine expands radially in response to a second radially outward force, wherein the first force is greater than the second force.

4. A method for deploying a stent in a bifurcated lumen, said method comprising:

providing a stent having a first portion, a second portion and a side opening between said portions, and wherein said first portion has a first axial spine and said second portion has a second axial spine;

expanding said first portion against a luminal wall segment on one side of the bifurcation;

aligning the side opening with the branch lumen; and

expanding the second portion on the other side of the bifurcation.

5. The method of claim 4 wherein said first axial spine comprises a different strut pattern than said second axial spine.

6. The method of claim 4 wherein said first and second axial spines are adapted to expand radially at different radially outward forces.

7. A stent for placement in a bifurcated body lumen having a main branch and a side branch, said stent comprising:

a radially expandable stent body having a proximal end, a distal end, a lumen therethrough, and an expandable side opening, said side opening having a perimeter defined by a continuous band of material, wherein said continuous band of material comprises protrusions which project inwardly to define a peripheral edge of the side opening.

8. A stent as in claim 7 wherein said expandable side opening is generally circular in shape prior to expansion of said stent body and generally circular in shape after expansion of said stent body.

9. A stent as in claim 7 wherein said expandable side opening is generally elliptical or oval in shape prior to expansion of said stent body and is generally circular in shape after expansion of said stent body.

10. A stent as in claim 7 wherein said expandable side opening is symmetric about a longitudinal axis of said stent body.

11. A stent as in claim 7 wherein said expandable side opening is symmetric about an axis extending laterally across said stent body.

12. A stent as in claim 7 wherein a shape of said side opening prior to expansion of said stent body is generally the same as said side opening shape after expansion of said stent body.

13. A stent as in claim 7 wherein a shape of said side opening remains generally constant during radial expansion of said stent body.

14. A stent as in claim 7 wherein an area of said side opening remains generally constant during expansion of said stent body.

15. A stent as in claim 7, wherein said side opening is adapted to expand when said stent body is radially expanded, and said side opening is adapted to further expand generally independent of said stent body radial expansion.

16. A stent for placement in a bifurcated body lumen having a main branch and a side branch, said stent comprising:

a radially expandable stent body having a proximal end, a distal end, a lumen therethrough, and an expandable side opening, said side opening having a perimeter defined by a continuous band of material;

wherein a shape of said side opening prior to expansion of said stent body is generally the same as said side opening shape after expansion of said stent body.

17. A stent for placement in a bifurcated body lumen having a main branch and a side branch, said stent comprising:

a radially expandable stent body having a proximal end, a distal end, a lumen therethrough, and an expandable side opening, said side opening having a perimeter defined by a continuous band of material, wherein a shape of said side opening remains generally constant during radial expansion of said stent body.

18. A stent for placement in a bifurcated body lumen having a main branch and a side brunch, said stent comprising:

a radially expandable stent body having a proximal end, a distal end, a lumen therethrough, and an expandable side opening, said side opening having a perimeter defined by a continuous band of material, wherein an area of said side opening remains generally constant during expansion of said stent body.

19. A stent for placement in a bifurcated body lumen having a main branch and a side branch, said stent comprising:

a radially expandable stent body having a proximal end, a distal end, a lumen therethrough, and an expandable side opening, said side opening having a perimeter defined by a continuous band of material, wherein said side opening is adapted to expand when said stent body is radially expanded, and said side opening is adapted to further expand generally independent of said stent body radial expansion.