Stent segments axially connected by thin film

• US 8,142,490 B2
• Filed: 10/24/2007
• Issued: 03/27/2012
• Est. Priority Date: 10/24/2007
• Status: Active Grant

• Current Assignee: Vactronix Scientific, LLC
• Original Assignee: Advanced Bio Prosthetic Surfaces, Ltd., Cordis Corporation (Cardinal Health, Inc.)
• Inventors: Bonsignore, Craig, RICE, Carolyn
• Primary Examiner(s): Stewart, Alvin J.
• Application Number:
  US11/923,308
• Publication Number:
  US 20090112306A1
• Time in Patent Office: 1,616 Days
• Field of Search: 623/1.44, 623/1.1, 623/1.11, 623/1.13, 623/1.15, 623 127- 135
• US Class Current: 623/1.29
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/844 folded prior to deployment
• CPC Class Codes: A61F 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• 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 2002/072 Encapsulated stents, e.g. wire or whole stent embedded in lining
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2250/0023 differing in porosity
• CPC Class Codes: Y10T 29/49982 Coating
• CPC Class Codes: Y10T 29/49995 Shaping one-piece blank by removing material

Abstract

In accordance with the present invention, there is provided a stent for insertion into a vessel of a patient. The stent has a front and back open ends and a longitudinal axis extending therebetween. The stent has a plurality of adjacent hoops that are held in alignment with the longitudinal axis between the front and back open ends by a thin film tube. The hoops are attached to either the inner or outer surface of the thin film tube. The stent is compressed into a first smaller diameter for insertion into the vessel with a delivery tube and a second larger diameter for deployment into the vessel. The inventive stent can be retracted into the delivery tube if it is improperly deployed.

Claims

1. A stent for insertion into a vessel of a patient, the stent comprising:

a) a tubular member having front and back open ends and a longitudinal axis extending therebetween, the tubular member having a first smaller diameter for percutaneous insertion into the vessel and a second larger diameter for deployment in the vessel;

b) the tubular member comprising a structural frame having a plurality of only discrete, independent, and unconnected adjacent hoops having inner and outer diameters and extending between the front and back ends of the tubular member, the hoops comprise a plurality of longitudinal struts and a plurality of loops connecting adjacent struts each of the plurality of longitudinal struts having a luminal surface, an abluminal surface, and side walls extending between the luminal and abluminal surfaces; and

c) a metallic thin film tube having inner and outer diameters, the thin film tube being affixed to at least a portion of the hoops and holding the plurality of hoops apart from each other and in alignment with the longitudinal axis, wherein when the tubular member is in the first smaller diameter, the thin film tube is folded axially inward between at least some circumferentially adjacent longitudinal struts, so as to extend past the abluminal surface and in between the side walls of the circumferentially adjacent longitudinal struts, the portions of the folded thin film tube containing bends defining a bending line, and the bending line being parallel to the longitudinal axis.

2. The stent according to claim 1 wherein the inner diameter of the thin film tube is attached to the outer diameters of at least some of the plurality of adjacent hoops.

3. The stent according to claim 1 wherein the outer diameter of the thin film tube is attached to the inner diameter of at least some of the plurality of adjacent hoops.

4. The stent according to claim 1 wherein the thin film tube is attached to some of the hoops with a welded connection.

5. The stent according to claim 1 wherein the thin film tube is attached to some of the hoops with an adhesive bond.

6. The stent according to claim 5 wherein the thin film tube has a larger pore size at an end of the thin film tube than in the center of the thin film tube.

7. The stent according to claim 1 wherein the thin film tube is attached to some of the hoops with a mechanical connection.

8. The stent according to claim 1 wherein a portion of the thin film tube is porous.

9. The stent according to claim 1 wherein the thin film tube is cut in a pattern to improve radial and longitudinal flexibility of the stent.

10. The stent according to claim 9 wherein the thin film tube is cut in a pattern to improve the flexibility of the stent.

16. The stent according to claim 1 or 11 wherein the thin film tube is vapor deposited onto and bonded to at least some of the tubular members.

11. A stent for insertion into a vessel of a patient, the stent comprising:

a) a tubular member having front and back open ends and a longitudinal axis extending therebetween, the tubular member having a first smaller diameter for percutaneous insertion into the vessel and a second larger diameter for deployment in the vessel;

b) the tubular member comprising a structural frame having a plurality of only discrete, independent and unconnected adjacent hoops made from a superelastic nickel titanium alloy, the hoops having an inner and outer surface defining a thickness there between, and extending between the front and back ends of the tubular member, the hoops comprise a plurality of longitudinal struts and a plurality of loops connecting adjacent struts; and

c) a metallic thin film tube made from a superelastic nickel titanium alloy affixed to at least a portion of the hoops, the thin film tube having inner and outer diameters and holding the plurality of hoops apart from each other and in alignment with the longitudinal axis, wherein when the tubular member is in the first smaller diameter, the thin film tube is folded between at least some circumferentially adjacent longitudinal struts so as to extend into an area circumferentially adjacent the hoop thickness, the portions of folded thin film tube containing bends defining a bending line, and the bending line being parallel to the longitudinal axis.

12. The stent according to claim 11 wherein the inner diameter of the thin film tube is attached to the outer diameters of at least some of the plurality of adjacent hoops.

13. The stent according to claim 11 wherein the outer diameter of the thin film tube is attached to the inner diameter of at least some of the plurality of adjacent hoops.

14. The stent according to claim 11 wherein the thin film tube is attached to some of the tubular member with a welded connection.

15. The stent according to claim 11 wherein the loops and struts have widths which are less than the thickness of the hoops.