Stent with enhanced friction

• US 6,254,631 B1
• Filed: 09/23/1999
• Issued: 07/03/2001
• Est. Priority Date: 09/23/1999
• Status: Expired due to Term

• Current Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Original Assignee: Intratherapeutics Incorporated (Sulzer Medica)
• Inventors: Thompson, Paul J.
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): KOH, CHOON P
• Application Number:
  US09/404,418
• Time in Patent Office: 649 Days
• Field of Search: 623/1.15, 623/1.17, 623/901, 623/921, 623/1.11
• US Class Current: 623/1.15
• 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 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• 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 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/9583 Means for holding the stent on the balloon, e.g. using protrusions, adhesives or an outer sleeve
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/0063 Three-dimensional shapes
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2250/0025 differing in roughness
• CPC Class Codes: Y10S 623/901 Method of manufacturing prosthetic device
• CPC Class Codes: Y10S 623/921 Blood vessel

Abstract

A stent for placement in a body lumen is fabricated by forming a tube having an un-deployed diameter sized for the tube to be placed on a deployment balloon and advanced through a body lumen to a deployment site. The tube is expandable upon inflation of the balloon to an enlarged diameter sized for the tube to be retained within the lumen at the site upon deflation and withdrawal of the balloon. The tube has a stent axis extending between first and second axial ends of the tube. The tube has an exterior surface and an interior surface. The tube is polished to polish the exterior surface to a smooth surface finish and with at least a portion of the interior surface having a rough surface finish rougher than the surface finish of the exterior surface.

Claims

1. An intraluminal stent comprising:

a tube having an un-deployed diameter sized for the tube to be placed on a deployment balloon and advanced through a body lumen to a deployment site;

said tube expandable upon inflation of said balloon to an enlarged diameter sized for said tube in said enlarged diameter to be retained within said lumen at said site upon deflation and withdrawal of said balloon;

said tube having a stent axis extending between first and second axial ends of said tube;

said tube having an exterior surface and an interior surface;

said interior surface including at least a portion having a rough surface finish rougher than a surface finish of said exterior surface.

2. A stent according to claim 1 wherein said portion includes first and second portion of said rough surface finish disposed on opposite sides of a center of said tube.

3. A stent according to claim 2 wherein said portion extends along substantially an entire axial length of said tube.

4. A method for fabricating a stent for placement in a body lumen, said method comprising:

forming a tube having an un-deployed diameter sized for the tube to be placed on a deployment balloon and advanced through a body lumen to a deployment site,

said tube expandable upon inflation of said balloon to an enlarged diameter sized for said tube in said enlarged diameter to be retained within said lumen at said site upon deflation and withdrawal of said balloon, said tube having a stent axis extending between first and second axial ends of said tube, said tube having an exterior surface and an interior surface;

polishing said tube to polish said exterior surface to a smooth surface finish and with at least a portion of said interior surface having a rough surface finish rougher than said exterior surface finish.

5. A method according to claim 4 wherein both said exterior surface and interior surface are polished to remove balloon threatening burrs and said portion of said interior surface is subsequently roughened to said rough surface finish.

6. A method according to claim 5 wherein said rough surface finish is applied at least on opposite sides of a center of said tube.

7. A method according to claim 6 wherein said rough surface finish is applied substantially entirely along an axial length of said interior surface.