Plain woven stents

• US 8,974,516 B2
• Filed: 12/17/2013
• Issued: 03/10/2015
• Est. Priority Date: 02/01/1999
• Status: Expired due to Fees

• Current Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Original Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Inventors: Hyodoh, Hideki, Konya, Andras, Wright, Kenneth C.
• Primary Examiner(s): NGUYEN, TUAN VAN
• Application Number:
  US14/109,890
• Publication Number:
  US 20140114389A1
• Time in Patent Office: 448 Days
• Field of Search: None
• US Class Current: 623/1.15
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/0108 Both ends closed, i.e. legs gathered at both ends
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2/04 Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts A61F2/18, A61F2/20 take precedence; devices, other than stent-grafts, providing patency to, or preventing collapsing of, tubular structures of the body other than stent-grafts, e.g. stents A61F2/82; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95
• CPC Class Codes: A61F 2/07 Stent-grafts
• 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 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/962 having an outer sleeve
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/077 having means to fill the space between stent-graft and aneurysm wall, e.g. a sleeve
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2220/0075 : sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0006 : circular
• CPC Class Codes: A61F 2230/001 : Figure-8-shaped, e.g. hourglass-shaped
• CPC Class Codes: A61F 2230/0015 : Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2230/0067 : conical
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2230/0076 : ellipsoidal or ovoid
• CPC Class Codes: A61F 2230/0078 : hyperboloidal
• CPC Class Codes: A61F 2230/008 : paraboloidal
• CPC Class Codes: A61F 2230/0091 : helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
• CPC Class Codes: A61F 2230/0093 : Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61F 2250/0039 : differing in diameter
• CPC Class Codes: D04C 1/06 : Braid or lace serving particular purposes
• CPC Class Codes: D04C 3/48 : Auxiliary devices
• CPC Class Codes: D10B 2509/06 : Vascular grafts; stents

Abstract

Self-expandable, woven intravascular devices for use as stents (both straight and tapered), filters (both temporary and permanent) and occluders for insertion and implantation into a variety of anatomical structures. The devices may be formed from shape memory metals such as nitinol. The devices may also be formed from biodegradable materials. Delivery systems for the devices include two hollow tubes that operate coaxially. A device is secured to the tubes prior to the implantation and delivery of the device by securing one end of the device to the outside of the inner tube and by securing the other end of the device to the outside of the outer tube. The stents may be partially or completely covered by graft materials, but may also be bare. The devices may be formed from a single wire. The devices may be formed by either hand or machine weaving. The devices may be created by bending shape memory wires around tabs projecting from a template, and weaving the ends of the wires to create the body of the device such that the wires cross each other to form a plurality of angles, at least one of the angles being obtuse. The value of the obtuse angle may be increased by axially compressing the body.

Claims

1. A device comprising:

a plurality of biodegradable filaments plain woven together to form a self-expanding body suitable for implantation into an anatomical structure, each of the filaments having filament ends, the self-expanding body having first and second ends, the biodegradable filaments crossing each other to form a plurality of angles, at least one of the angles being obtuse, and both filament ends of at least one biodegradable filament being located proximate the first end of the self-expanding body;

wherein the value of the at least one obtuse angle is increased by axially compressing the self-expanding body; and

wherein each filament end is fixedly joined to another filament end instead of by twisting.

2. The device of claim 1, wherein the biodegradable filaments are made from polyglycolic acid.

3. The device of claim 1, wherein the biodegradable filaments are made from poly-L-lactic acid.

4. The device of claim 1, wherein the biodegradable filaments are made from a polyorthoester.

5. The device of claim 1, wherein the biodegradable filaments are made from a polyanhydride.

6. The device of claim 1, wherein the biodegradable filaments are made from a polyiminocarbonate.

7. The device of claim 1, wherein the biodegradable filaments are made from an inorganic calcium phosphate.

8. The device of claim 1, wherein the biodegradable filaments include about 0.05 to 0.25 wt.-% of calcium oxide, calcium hydroxide, calcium carbonate, calcium phosphate, magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesium phosphate, sodium phosphate or potassium sulfate.

9. The device of claim 1, wherein the biodegradable filaments are made from a polymer having about 15 to about 30 mole-% glycolide.

10. The device of claim 1, wherein at least one of the biodegradable filaments is made from paclitaxel, docetaxel or heparin.

11. The device of claim 1, wherein each end of the self-expanding body includes at least one closed structure.

12. The device of claim 1, the device further comprising at least one shape memory wire secured to the self-expanding body.

13. The device of claim 12, wherein both ends of the one shape memory wire are located proximate one end of the self-expanding body.

14. The device of claim 11, wherein the at least one closed structure comprises a bend.

15. The device of claim 1, wherein each of the biodegradable filaments comprises a bend close to a midpoint of said biodegradable filament, the bends being located at the second end of the self-expanding body.

16. The device of claim 1, wherein each filament end of the plurality of biodegradable filaments is located proximate the first end of the self-expanding body.