High strength and high density intraluminal wire stent

• US 5,575,816 A
• Filed: 08/12/1994
• Issued: 11/19/1996
• Est. Priority Date: 08/12/1994
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Meadox Medicals, Inc. (Boston Scientific Corporation)
• Inventors: Rudnick, James J., Wiktor, Dominik M.
• Primary Examiner(s): BRITTINGHAM, DEBRA
• Application Number:
  US08/289,791
• Time in Patent Office: 830 Days
• Field of Search: 623/1, 623/11, 623/12, 600/36, 606/194-200, 606/157-158
• US Class Current: 623/1.15
• 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 2220/0058 soldered or brazed or welded
• CPC Class Codes: B21F 45/008 of medical instruments, e.g. stents, corneal rings medical science A61

Abstract

An intraluminally implantable stent is formed of helically wound wire. The stent has a generally elongate tubular configuration and is radially expandable after implantation in a body vessel. The wire includes successively formed waves along the length of the wire. When helically wound into a tube, the waves are longitudinally nested along the longitudinal extent of the stent so as to form a densely compacted wire configuration. After radial expansion the stent maintains high radial compressive strength and wire density to retard tissue ingrowth.

Claims

1. An intraluminal stent comprising:

a generally elongate tubular body formed of an elongate helically wound wire, said helically wound wire defining longitudinally spaced windings, the wire being formed into successive generally longitudinally aligned waves having a given amplitude along a length of the wire, the waves being arranged in non-overlapping longitudinally spaced succession along a length of said tube, the longitudinal spacing of the helical windings being less than twice the given amplitude of the wave;

said body defining an open area between said helically wound wire and wherein said percentage of open surface area of said stent in relationship to the total surface area of said stent is less than 28% in the closed condition.

2. An intraluminal stent of claim 1 wherein longitudinally adjacent ones of said waves are longitudinally nested along the length of said tubular body.

3. An intraluminal stent of claim 2 wherein said longitudinally nested waves define peaks which are linerally aligned.

4. An intraluminal stent of claim 1 wherein said longitudinal spacing of the helical windings is less than the amplitude of the wave.

5. An intraluminal stent of claim 1 wherein said tubular body is uniformly flexible along the length thereof.

6. An intraluminal stent of claim 5 wherein said stent is radially expandable after intraluminal implantation.

7. A radially expandable generally tubular endoluminal implantable prosthesis comprising:

a wire which is wound in a helical configuration to define a generally elongate tubular body, the wire including successively formed waves along the length of said wire, each wire wave being non-overlappingly nested within the wave formed longitudinally there adjacent;

said wire having a given wire diameter mad wherein said wire defines a generally cylindrical outer surface having solid portions formed by said wire and open portions formed between said wound wire;

said generally cylindrical outer surface defining a total surface area including an open surface and a wire surface and wherein said non-expanded wire surface substantially exceeds said open surface.

8. A prosthesis of claim 7 wherein said wire waves are of generally uniform configuration defining a peak-to-peak amplitude of a preselected first dimension.

9. A prosthesis of claim 8 wherein said longitudinally adjacent wire waves are spaced apart a preselected second dimension which is less than the preselected first dimension.

10. A prosthesis of claim 7 wherein said open surface area is approximately 28% of said total surface area.