Stents for prosthetic heart valves and methods of making same

• US 9,561,119 B2
• Filed: 07/29/2013
• Issued: 02/07/2017
• Est. Priority Date: 04/21/2009
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Eberhardt, Carol E., Kalam, Faisal
• Primary Examiner(s): Tolan, Edward
• Application Number:
  US13/953,100
• Publication Number:
  US 20130305800A1
• Time in Patent Office: 1,289 Days
• Field of Search: 723/421, 723/47, 723/48, 723/80
• US Class Current: 1/1
• CPC Class Codes: A61F 2/2415 Manufacturing methods
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2230/0023 triangular
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: B21C 37/065 starting from a specific blank, e.g. tailored blank
• CPC Class Codes: B21C 37/157 Perforations
• CPC Class Codes: B21D 31/00 Other methods for working sheet metal, metal tubes, metal profiles deforming one surface of tubes helically by rolling B21H3/00; upsetting B21J5/08; working metal by removing material therefrom B23; embossing B44B

Abstract

A single piece stent construction having a plurality of commissure posts, each of which extends upwardly from a solid ring along a bend line and generally along a central longitudinal axis of the stent.

Claims

1. A method of forming a tubular stent having a single-piece construction, comprising the steps of:

providing a generally flat stent blank comprising;

a solid ring having a central opening;

a plurality of shaped members extending outwardly from the ring; and

a plurality of sinusoidal structures each having a plurality of peaks and valleys, wherein each sinusoidal structure extends radially outward from the ring and extends between adjacent shaped members; and

applying heat to the stent blank while bending each of the shaped members upwardly along a bend line toward a central longitudinal axis that extends through a central point of the ring.

2. The method of claim 1, wherein the stent blank comprises a shape memory material.

3. The method of claim 1, wherein the stent blank comprises stainless steel.

4. The method of claim 3, wherein the step of applying heat to the stent blank comprises deep forming the stent into a tubular shape.

5. The method of claim 1, wherein each sinusoidal structure comprises at least one wire structure spaced from the ring and having a first end extending from a first shaped member and a second end extending from a second shaped member that is adjacent to the first shaped member, and wherein the step of applying heat to the stent blank comprises forming the wire structure toward the central longitudinal axis of the stent.

6. The method of claim 1, wherein each sinusoidal structure comprises a wire structure.

7. The method of claim 1, further comprising the step of attaching a valve to each of the shaped members within an interior area of the stent, wherein the valve comprises a leaflet extending between each pair of shaped members.

8. The method of claim 1, further comprising the step of cutting the stent blank from a solid sheet of material prior to applying heat to the stent blank.

9. The method of claim 1, wherein an outer circumference of the tubular stent comprises the plurality of shaped members following bending of the shaped members upwardly along a bend line toward a central longitudinal axis that extends through a central point of the ring.

10. The method of claim 1, further comprising at least one support member extending between the ring and a sinusoidal structure.

11. The method of claim 10, further comprising the step of applying heat to the stent blank while bending the support member upwardly along a bend line toward a central longitudinal axis that extends through a central point of the ring.

12. A method of forming a tubular stent having a single-piece construction, comprising the steps of:

providing a generally flat stent blank comprising;

a solid ring having a central opening;

a plurality of shaped members extending outwardly from the ring;

a plurality of sinusoidal structures each having a plurality of peaks and valleys, wherein each sinusoidal structure is spaced outwardly from the ring and extends between adjacent shaped members; and

a plurality of support members, wherein each support member extends radially outward from the ring to a valley of a sinusoidal structure; and

applying heat to the stent blank while bending each of the shaped members and the support members upwardly along a bend line toward a central longitudinal axis that extends through a central point of the ring.

13. The method of claim 12, wherein the stent blank comprises a shape memory material.

14. The method of claim 12, wherein the stent blank comprises stainless steel.

15. The method of claim 12, wherein the step of applying heat to the stent blank comprises deep forming the stent into a tubular shape.

16. The method of claim 12, wherein each sinusoidal structure comprises a wire structure.

17. The method of claim 12, further comprising the step of attaching a valve to each of the shaped members within an interior area of the stent, wherein the valve comprises a leaflet extending between each pair of shaped members.

18. The method of claim 12, further comprising the step of cutting the stent blank from a solid sheet of material prior to applying heat to the stent blank.

19. The method of claim 12, wherein an outer circumference of the tubular stent comprises the plurality of shaped members following the bending of the shaped members upwardly along a bend line toward a central longitudinal axis that extends through a central point of the ring.

20. The method of claim 12, wherein each of the shaped members extends in a direction that is generally parallel to a central longitudinal axis of the tubular stent following the bending of the shaped members upwardly along a bend line toward a central longitudinal axis that extends through a central point of the ring.