Welded sinusoidal wave stent

• US 6,136,023 A
• Filed: 08/19/1998
• Issued: 10/24/2000
• Est. Priority Date: 04/16/1996
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Boyle, William J.
• Primary Examiner(s): Willse, David H.
• Application Number:
  US09/136,394
• Time in Patent Office: 797 Days
• Field of Search: 623/11, 623/12, 623/1.15, 623/1.16, 623/1.22, 623/23.7
• US Class Current: 623/1.22
• 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 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2250/0014 having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
• CPC Class Codes: B21F 45/008 of medical instruments, e.g. stents, corneal rings medical science A61

Abstract

A wire stent having a preformed series of peaks alternating with valleys. The wire is formed from a malleable or resilient material and can be wound into a continuous helix. Each pair of peaks and valleys constitutes a wave. The stent has a number of waves per circumferential revolution such that the adjoining waves align off-peak to off-valley with one or more such adjoining waves being affixed to each other at the off-peak to off-valley locations. The waves can be welded at all locations or only at the circumferential revolutions at the proximal and distal ends of the stent, or intermittently, or in barber pole fashion or along one or more longitudinal axes.

Claims

1. A medical device for use in supporting a luminal surface of a human or animal body comprising a malleable or resilient wire having a proximal end, a distal end, and a preformed series of peaks alternating with valleys;

each peak and contiguous valley constituting a wave;

the device being formed in a hollow cylindrical shape comprising a plurality of circumferential revolutions of the wire and having a number of waves per circumferential revolution;

wherein a first wave of a circumferential revolution having an off-peak point aligns to a second wave of an adjoining circumferential revolution having an off-valley point and wherein the first and second waves of at least one pair so aligned are affixed to each other at a contact point comprising the off-peak point of the first wave and the off-valley point of the second wave.

2. The medical device according to claim 1 wherein the first and second waves are welded to each other at the contact point.

3. The medical device according to claim 2 wherein the first and second waves are laser welded to each other at the contact point.

4. The medical device according to claim 1 wherein the off-peak point is defined by a peak angle of greater than 0 degrees and not greater than 90 degrees and wherein the off-valley point is defined by a valley angle of greater than 0 degrees and not greater than 90 degrees.

5. The medical device according to claim 4 wherein the peak angle comprises 45 degrees and the valley angle comprises 45 degrees.

6. The medical device according to claim 1 wherein the wire is made of a biocompatible metal that can be plastically deformed at low to moderate stress levels.

7. The medical device according to claim 1 wherein the wire is formed of a super-elastic metallic material.

8. The medical device according to claim 1 wherein the wire has four waves per circumferential revolution.

9. The medical device according to claim 1 wherein each first wave and each second wave are welded to each other at each and every contact point.

10. The medical device according to claim 1 wherein the proximal end of the wire and the distal end of the wire each comprises at least one contact point at which a first and second wave are affixed.

11. The medical device according to claim 10 wherein the proximal end of the wire and the distal end of the wire each comprises at least one first circumferential revolution, each wave of the first circumferential revolution having an off-peak point that aligns to a wave of a second adjoining circumferential revolution having an off-valley point and wherein each of the waves of the first circumferential revolution is affixed to a wave of the second circumferential revolution at a contact point comprising an off-peak point of a wave of the first circumferential revolution and an off-valley point of a wave of the second circumferential revolution;

the wire further comprising at least one third circumferential revolution between the proximal and distal ends of the wire, each wave of the third circumferential revolution being unaffixed to a wave of an adjoining circumferential revolution.

12. The medical device according to claim 1 wherein pairs of first and second waves so aligned are welded intermittently throughout the helix.

13. The medical device according to claim 1 wherein pairs of first and second waves so aligned are welded in a spiral barber pole fashion relative to the longitudinal axis of the cylinder.

14. The medical device according to claim 1 wherein the pairs of first and second waves so aligned are welded along one or more longitudinal axes of a helix parallel to the longitudinal axis of the cylinder.

15. The medical device of claim 1 wherein the wire is wound into a continuous helix.

16. A medical device for use in supporting a luminal surface of a human or animal body comprising a malleable or resilient wire having a proximal end, a distal end, and a preformed series of peaks alternating with valleys;

each peak and contiguous valley constituting a wave;

the device being formed in a hollow cylindrical shape comprising a plurality of circumferential revolutions of the wire and having a number of waves per circumferential revolution;

wherein a first wave of a circumferential revolution having an off-peak point aligns in a partially nested fashion to a second wave of an adjoining circumferential cicumferential revolution having an off-valley point and wherein the first and second waves of at least one pair so aligned are affixed to each other at a contact point comprising the off-peak point of the first wave and the off-valley point of the second wave.

17. The medical device according to claim 16 wherein the first and second waves are welded to each other at the contact point.

18. The medical device according to claim 16 wherein the off-peak point is defined by a peak angle of greater than 0 degrees and not greater than 90 degrees and wherein the off-valley point is defined by a valley angle of greater than 0 degrees and not greater than 90 degrees.

19. The medical device according to claim 18 wherein the peak angle comprises 45 degrees and the valley angle comprises 45 degrees.

20. The medical device according to claim 16 wherein the wire has four waves per circumferential revolution.

21. The medical device according to claim 16 wherein the proximal end of the wire and distal end of the wire each comprises at least one contact point at which a first and second wave are affixed.

22. The medical device according to claim 16 wherein the wire is wound into a continuous helix.