Extendible stent apparatus

• US 20040133268A1
• Filed: 10/14/2003
• Published: 07/08/2004
• Est. Priority Date: 01/14/1998
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Advanced Stent Technologies Inc. (Boston Scientific Corporation)
• Inventors: Lin, Stuart, Williams, Eric, Vardi, Gil M., Davidson, Charles J.
• Granted Patent: US 7,118,593 B2
• Time in Patent Office: Days
• US Class Current: 623/1.35
• 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 2/856 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 2002/065 Y-shaped blood vessels
• 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 2002/91558 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 present invention concerns novel stent apparatuses for use in treating lesions at or near the bifurcation point in bifurcated cardiac, coronary, renal, peripheral vascular, gastrointestinal, pulmonary, urinary and neurovascular vessels and brain vessels. More particularly, the invention concerns a stent apparatus with at least one side opening which may further comprise an extendable stent portion laterally extending from the side opening and at least partly in registry with the wall of the side opening. Devices constructed in accordance with the invention include, singularly or in combination, a main expandable stent comprising at least one substantially circular side opening located between its proximal and distal end openings, which side opening may further comprise an expandable portion extending radially outward from the edges of the side opening; and a branch stent comprising proximal and distal end openings and which may further comprise a contacting portion at its proximal end, and which may optionally be constructed to form either a perpendicular branch or a non-perpendicular branch when inserted through a side opening of the main stent. The stents of the invention are marked with, or at least partially constructed of, a material which is imageable during intraluminal catheterization techniques, most preferably but not limited to ultrasound and x-ray.

Claims

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

a main tubular stent body having a first end, a second end, a lumen therethrough, and a side opening have a plurality of laterally deployable elements therein.

2. A stent as in claim 1, wherein the elements are formed as an integral part of the stent body.

3. A stent as in claim 2, wherein, prior to deployment, the laterally deployable elements are aligned in a tubular envelope defined by the tubular stent body.

4. A stent as in any of the preceding claims, wherein the main tubular stent body is resilient so that it may be released from constraint for deployment.

5. A stent as in any of the preceding claims, wherein the main tubular stent body is deformable so that it may be expanded by a balloon catheter.

6. A stent as in any of the preceding claims, wherein at least a portion of the main stent body is radiopaque.

7. A stent as in claim 6, wherein at least a portion of the main stent body surrounding the side hole is radiopaque.

8. A stent as in any of the preceding claims, having a radially compressed configuration, wherein the length is less than 4 cm and the diameter is less than 2 cm.

9. A stent as in any of the preceding claims, wherein the side hole comprises a continuous band.

10. A stent as in claim 9, wherein the laterally deployable elements are inwardly projecting loops of the continuous band.

15. A stent system comprising:

(a) a stent as in any of the preceding claims; and

(b) a second stent adapted to fit within and contact the laterally deployable elements of the main tubular stent.

19. A kit comprising:

a stent as in any of claims 1 to 10; and

instructions for use setting forth a method including the following steps;

(a) expanding the main tubular stent body in a body lumen so that a side hole on the stent body is aligned with a branching body lumen; and

(b) laterally deflecting a plurality of elements disposed about the side opening so that they enter into the branching body lumen.

20. A kit comprising:

a stent system in claim 9;

and

instructions for use setting forth a method including the following steps;

(a) expanding the main tubular stent body in a body lumen so that a side hole on the stent body is aligned with a branching body lumen;

(b) laterally deflecting a plurality of elements disposed about the side opening so that they enter into the branching body lumen; and

(c) placing the second stent into the side hole so that said second stent engages the laterally deflected plurality of elements.

11. A stent for placement in a bifurcated body lumen, said stent comprising:

a main tubular body having a first end, a second end, and a side opening between said ends, wherein a first portion of the main tubular body between the first end and the side hole opens in response to a first radially outward pressure and a second portion of the main tubular body between the side hole and the second end opens in response to a second pressure, wherein the first pressure is less than the second pressure.

12. A stent as in claim 11, wherein the first pressure is in the range from 1 atmospheres to 10 atmospheres and the second pressure is in the range from 2 atmospheres to 18 atmospheres.

13. A stent as in claim 11 or 12, wherein the first portion has a first axial spine and the second portion has a second axial spine, wherein the first axial spine opens circumferentially to a first force and the second axial spine opens circumferentially in response to a second force, wherein the first force is less than the second force.

14. A stent as in claim 11 or 12, wherein the first portion comprises serpentine rings with a first strut length and the second portion comprises serpentine rings with a second strut length, wherein the first strut length is greater than the second strut length.

21. A kit comprising:

a stent as in any of claims 11-14; and

instructions for use setting forth a method comprising the following steps;

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

(b) aligning the side hole with the branch lumen; and

(c) expanding the second portion on the other side of the bifurcation.

16. A method for attaching a second stent to a first stent, said method comprising:

expanding a main tubular stent body; and

laterally deflecting a plurality of elements disposed about a side opening on the main tubular stent body.

17. A method as in claim 16, further comprising placing a second stent into the side hole so that said second stent engages the laterally deflected element.

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

providing a stent having a first portion, a second portion, and a side hole between said portions;

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

aligning the side hole with the branch lumen; and

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