Double wave stent with strut

• US 5,843,168 A
• Filed: 03/31/1997
• Issued: 12/01/1998
• Est. Priority Date: 03/31/1997
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Dang, Kenny L.
• Primary Examiner(s): Prebilic, Paul B.
• Application Number:
  US08/828,612
• Time in Patent Office: 610 Days
• Field of Search: 623/1, 623/12, 606/191, 606/194, 606/198
• US Class Current: 623/1.15
• 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 2002/825 having longitudinal struts

Abstract

A radially expandable stent for implantation within a body vessel, comprising a first and second elongated element having a series of peaks alternating with valleys forming a wave shape therein. The first elongated element is interwoven with the second elongated element in a series of crossovers, with each crossover forming a symmetrical intersection and each successive pair of crossovers defining a loop. The interwoven first and second elongated elements are wound into a hollow cylindrical shape with at least one longitudinal strut extending parallel to a longitudinal axis of the hollow cylindrical shape and passing through at least one of the loops along the hollow cylindrical shape.

Claims

1. A radially expandable stent for implantation within a body vessel, comprising:

a first elongated element having a series of peaks alternating with valleys forming a wave shape therein;

a second elongated element having a series of peaks alternating with valleys forming a wave shape therein;

the first elongated element being interwoven with the second elongated element in a series of freely moving crossovers in a longitudinal direction and in a hoop direction, each crossover forming a symmetrical unaffixed intersection such as the stent is expandable from a first radial diameter to a second radial diameter;

each successive pair of crossovers defining a loop;

the interwoven first and second elongated elements being wound into a hollow cylindrical shape; and

at least one longitudinal strut extending parallel to a longitudinal axis of the hollow cylindrical shape and passing through at least one loop along the hollow cylindrical shape.

2. The stent according to claim 1 wherein the first and second elongated elements are formed of a biocompatible metal that can be plastically deformed as the stent is radially expanded from a first compressed diameter to a second expanded diameter.

3. The stent according to claim 1 wherein the interwoven first and second elongated elements are wound in a helix to form the hollow cylindrical shape.

4. The stent according to claim 1 wherein an end of the first elongated element is attached to a portion of the second elongated element.

5. The stent according to claim 1 wherein the hollow cylindrical shape includes a series of loop extending 360 degrees around the hollow cylindrical shape such that the loop becomes elongated as the stent is expanded from a first, compressed radius to a second expanded radius.

6. The stent according to claim 1 wherein an end of the strut is attached to a portion of at least one of the first and second elongated elements at an end of the hollow cylindrical shape.

7. The stent according to claim 1 wherein the first and second elements are able to move and slide with respect to each other at a plurality of the crossover as a mechanical force is applied to the stent.

8. The stent according to claim 1 wherein the strut is able to move and slide with respect to the loop as a mechanical force is applied to the stent.

9. A radially expandable stent for implantation within a body vessel, comprising:

a first wire having a performed series of peaks alternating with valleys therein each peak and valley pair forming a wave, the first wire having a proximal end and a distal end;

a second wire having a performed series of peaks alternating with valleys therein, the second wire having a proximal end and a distal end;

the first wire being interwoven the second wire such that a series of freely moving crossovers in a longitudinal direction and in a hoop direction, is formed wherein the first wire and the second wire alternate being on top of the other with the crossovers occurring half way between the peak and valley of the first wire segment and the peak and valley of the second wire segment thereby forming symmetrical unaffixed intersections such that the stent is expandable from a first radial diameter to a second radial diameter;

each successive pair of crossovers defining a loop;

the interwoven first and second wires being wound into a continuous helix having a hollow cylindrical shape with each 360 degree series of loops constituting an element; and

at least one longitudinal strut having a proximal end and a distal end, the strut extending parallel to a longitudinal axis of the hollow cylindrical shape and passing through at least one loop along the hollow cylindrical shape.

10. The stent according to claim 9 wherein the first and second wires are formed of a biocompatible metal that can be plastically deformed as the stent is radically expanded from a first compressed diameter to a second expanded diameter.

11. The stent according to claim 9 having a means within the interwoven first and second wires of the continuous helix for expanding the interwoven first and second wires of the continuous helix.

12. The stent according to claim 9 wherein the proximal end of the first wire segment is attached to the second wire segment forming a first wire proximal loop attachment, the proximal end of the second wire segment is attached to the first wire segment of an adjoining element or to the second wire segment of an adjoining element forming a second wire segment proximal loop attachment.

13. The stent according to claim 9 wherein the distal end of the first wire segment is attached to the second wire segment forming a first wire segment distal loop attachment, the distal end of the second wire segment is attached to the first wire segment of an adjoining element or to the second wire segment of an adjoining element forming a second wire segment distal loop attachment.

14. The stent according to claim 9 wherein the proximal end of the strut is affixed to a location on the second wire segment distal to the first wire segment proximal loop attachment, the distal end of the strut is attached to a location on the second wire segment distal to the first wire segment distal loop attachment.

15. The stent according to claim 9 wherein the first and second wire segment proximal and distal loop attachments, and the strut proximal and distal loop attachments could be made by manually looping or by twisting, or by biocompatible adhesive, or by brazing, or by crimping, or by welding or by stamping.