Low profile highly expandable stent

• US 6,224,625 B1
• Filed: 10/27/1997
• Issued: 05/01/2001
• Est. Priority Date: 10/27/1997
• Status: Expired due to Fees

• Current Assignee: Vascular Concepts Holdings Limited
• Original Assignee: Iowa-India Investments Company Limited
• Inventors: Jayaraman, Swaminathan
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): STEWART, ALVIN J
• Application Number:
  US08/958,104
• Time in Patent Office: 1,282 Days
• Field of Search: 623/1, 623/12, 623/1.1, 623/1.11, 623/1.12, 623/1.13, 623/1.15, 623/1.16, 623/1.17, 623/1.18, 623/1.19, 623/1.21, 623/1.22, 606/194, 606/198
• US Class Current: 623/1.15
• CPC Class Codes: A61F 2/07 Stent-grafts
• 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 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable

Abstract

A stent is disclosed in several embodiments including the use of a material known as NITINOL forming the ends of the stent as well as support structure connecting the ends. A fabric is interconnected with the NITINOL structure to form the stent. The NITINOL material ends have slits parallel with the direction of elongation of the stent allowing radial expansion of the ends. The pieces interconnecting the ends have a serpentine shape allowing longitudinal expansion of the stent. The NITINOL material structure may be located within the fabric portion or outside the fabric portion. The connecting pieces may be separate structures attached to the fabric. Alternatively, the end pieces may be separate structures attached to the fabric without the connecting pieces.

Claims

1. A low profile, highly expandable stent, comprising:

a) a framework having two spaced non-cuffed, generally cylindrical monolayer end pieces;

b) a tubular member interconnecting solely with said end pieces;

c) the end pieces having a plurality of circumferentially spaced longitudinal slits;

d) the end pieces connected to the tubular member with stitching to form a one piece integral unit;

e) a plurality of spaced apart longitudinal members interconnecting the end pieces so that from a fully compressed state, the stent will expand both radially and longitudinally from a diameter and a length of the compressed state, when released in a lumen of a patient; and

f) the stitching disposed at points along the end pieces in between each of the plurality of spaced apart longitudinal members.

2. The stent of claim 1, wherein each of said longitudinal members has a serpentine shape.

3. The stent of claim 1, wherein said longitudinal members are circumferentially spaced about said end pieces.

4. The stent of claim 1, wherein said tubular member is within said longitudinal members.

5. The stent of claim 1, wherein said tubular member surrounds said longitudinal members.

6. The stent of claim 5, wherein said tubular member surrounds said end pieces.

7. The stent of claim 1, wherein said end pieces are made of a nickel-titanium alloy.

8. The stent of claim 2, wherein said end pieces and the longitudinal members are made of a nickel-titanium alloy.

9. The stent of claim 1, wherein said tubular member is a fabric tube.

10. A low profile, highly expandable stent, comprising:

a) a fabric tubular member;

b) a plurality of circumferentially spaced apart connecting members having first and second ends, the connecting members unconnected but juxtaposed to the tubular member to promote longitudinal expansion of the stent;

c) the fabric tubular member interconnecting solely by stitching with a non-cuffed end piece at a first and second end, the stitching disposed at points along the end pieces in between each of the plurality of circumferentially spaced apart connecting members;

d) the connecting members integral with an end piece at the first and second end of each connecting member; and

e) a plurality of circumferentially spaced longitudinal slits formed in each end piece whereby the stent expands radially from its initial diameter of about 1.5 mm to up to 12 mm in a patient'"'"'s lumen.

11. The stent of claim 10, wherein each of said connecting members is serpentine in shape.

12. The stent of claim 10, wherein said connecting members are attached outside said tubular member.

13. The stent of claim 10, wherein said connecting members are made of a nickel-titanium alloy.