PROSTHETIC HEART VALVE, PROSTHETIC HEART VALVE ASSEMBLY AND METHOD FOR MAKING SAME

• US 20100011564A1
• Filed: 04/16/2009
• Published: 01/21/2010
• Est. Priority Date: 04/29/2008
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Young, Melissa, Shay, Janice L., Majkrzak, Carolyn, Millwee, Billie J., Kupumbati, Tara S.
• Granted Patent: US 8,136,218 B2
• Time in Patent Office: Days
• US Class Current: 29/527.300
• CPC Class Codes: A61F 2/2415 Manufacturing methods
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: Y10T 29/49412 with assembly, disassembly or composite article making
• CPC Class Codes: Y10T 29/49984 and casting

Abstract

A mold assembly for forming a prosthetic valve having at least one leaflet, which includes a first plate having a first side from which at least one leaflet mold extends and a planar portion adjacent the at least one leaflet mold, wherein the planar portion has multiple access holes through its thickness, and a second plate having at least one mold opening and a planar portion adjacent the at least one mold opening, wherein each mold opening is sized and shaped to correspond with one of the leaflet molds of the first plate, and wherein the planar portion has multiple access holes through its thickness. The second plate is positionable relative to the first plate so that each of the leaflet molds of the first plate extend at least partially through one of the mold openings of the second plate.

Claims

1. A mold assembly for forming a prosthetic valve having at least one leaflet, the mold assembly comprising:

a first plate having a first side from which at least one leaflet mold extends and a planar portion adjacent the at least one leaflet mold, wherein the planar portion comprises a thickness and multiple access holes through its thickness; and

a second plate having at least one mold opening and a planar portion adjacent to the at least one mold opening, wherein each mold opening is sized and shaped to correspond with one of the leaflet molds of the first plate, and wherein the planar portion comprises a thickness and multiple access holes through its thickness;

wherein the second plate is positionable relative to the first plate so that each of the leaflet molds of the first plate extend at least partially through one of the mold openings of the second plate.

2. The mold assembly of claim 1, wherein the first plate comprises three leaflet molds and the second plate comprises three mold openings that correspond to the three leaflet molds.

3. The mold assembly of claim 2, wherein the three leaflet molds are positioned along an arc on the surface of the first plate.

4. The mold assembly of claim 1, wherein each of the leaflet molds comprises a top contoured surface.

5. The mold assembly of claim 4, wherein the top contoured surface of each of the leaflet molds comprises a convex surface relative to the first side of the first plate.

6. The mold assembly of claim 1, further comprising a first leaflet sewing guide comprising multiple holes spaced from each other, wherein the first leaflet sewing guide is positioned around at least a portion of the periphery of at least one of the leaflet molds of the first plate.

7. The mold assembly of claim 1, further comprising a second leaflet sewing guide comprising multiple holes spaced from each other, wherein the second leaflet sewing guide is positioned around at least a portion of the periphery of at least one of the mold openings of the second plate.

8. The mold assembly of claim 1, wherein the second plate further comprises at least two mold openings and a commissure support slot positioned between the mold openings of each pair of adjacent mold openings.

9. The mold assembly of claim 8, wherein the first plate further comprises at least two leaflet molds and a commissure sewing guide positioned between the leaflet molds of each pair of adjacent leaflet molds, wherein each commissure sewing guide is generally in alignment with one commissure support slot of the second plate.

10. The mold assembly of claim 1, wherein the first plate comprises a first cuff sewing guide comprising multiple holes spaced from each other, wherein the first cuff sewing guide is spaced from a curved edge of each of the leaflet molds.

11. The mold assembly of claim 10, wherein the second plate comprises a second cuff sewing guide comprising multiple holes spaced from each other, wherein the second cuff sewing guide is spaced from a curved edge of each of the mold openings.

12. A method of forming a prosthetic heart valve, comprising the steps of:

providing a first plate having a first side from which at least one leaflet mold extends and a planar portion adjacent to the one leaflet mold and having a thickness, wherein the planar portion comprises multiple access holes through its thickness through which fluid can flow and wherein the at least one leaflet mold comprises a convex outer surface;

positioning a sheet of material over the convex surface of each of the leaflet molds and at least a portion of the planar portion of the first plate;

providing a second plate comprising at least one mold opening and a planar portion adjacent to the at least one mold opening and having a thickness, wherein each mold opening is sized and shaped to correspond with one of the leaflet molds of the first plate, and wherein the planar portion comprises multiple access holes through its thickness through which fluid can flow;

positioning the second plate relative to the first plate and sheet of material so that the portion of the sheet of material that covers each of the leaflet molds of the first plate extends at least partially through one of the mold openings of the second plate.

13. The method of claim 12, further comprising the step of submerging the first and second plates and sheet of material in a fixation solution.

14. The method of claim 12, further comprising the step of attaching a piece of cuff material to an edge of the sheet of material.

15. The method of claim 14, wherein the first plate further comprises a first cuff sewing guide comprising multiple holes spaced from each other, wherein the first cuff sewing guide is spaced from a curved edge of each of the leaflet molds, and wherein the step of attaching a piece of cuff material comprises sewing the piece of cuff material to the end of the sheet of material along the sewing guide.

16. The method of claim 15, wherein the second plate comprises a second cuff sewing guide comprising multiple holes spaced from each other, wherein the second cuff sewing guide is spaced from a curved edge of each of the mold openings.

17. The method of claim 12, wherein the second plate further comprises at least two mold openings and a commissure support slot positioned between the mold openings of each pair of adjacent mold openings.

18. The method of claim 12, wherein the first plate comprises three leaflet molds and the second plate comprises three mold openings that correspond to the three leaflet molds, and wherein the three leaflet molds are positioned along an arc on the surface of the first plate.

19. A method of forming a leaflet of a prosthetic heart valve, comprising the steps of:

placing a first piece of material on a working surface with a first surface of the first piece of material facing generally outwardly;

placing a leaflet mold on the first surface of the first piece of material, wherein the leaflet mold comprises a planar surface, a convex surface extending from the planar surface, an outer peripheral shape that comprises a curved portion, and a post extending from the leaflet mold in a direction that is generally parallel to the planar surface of the leaflet mold;

placing a second piece of material over the first piece of material and the convex surface of the leaflet mold;

stitching the first piece of material to the second piece of material along at least a portion of the curved portion of the outer peripheral shape of the leaflet mold; and

removing the leaflet mold from the first and second pieces of material.

20. The method of claim 19, further comprising the step of fixing the first and second pieces of material with a fixation solution prior to removing the leaflet mold from the first and second pieces of material.