Composite wire for implantable cardiac lead conductor cable and coils

• US 7,612,291 B2
• Filed: 11/09/2006
• Issued: 11/03/2009
• Est. Priority Date: 11/10/2005
• Status: Active Grant

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Hoeker, Russell L., Chastain, Stuart R.
• Primary Examiner(s): Nguyen; Chau N
• Application Number:
  US11/558,147
• Publication Number:
  US 20070154729A1
• Time in Patent Office: 1,090 Days
• Field of Search: 174/126.1, 174/126.2, 174/128.1, 174/128.2
• US Class Current: 174/126.1
• CPC Class Codes: A61L 31/088 Other specific inorganic materials not covered by A61L31/084 or A61L31/086
• CPC Class Codes: A61L 31/124 of other specific inorganic materials not covered by A61L31/122 or A61L31/123
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/056 Transvascular endocardial electrode systems
• CPC Class Codes: Y10T 428/12438 Composite

Abstract

A composite wire can include a core including a material chosen from the group consisting of Ag and Ir and combinations thereof, a shell around the core including a material chosen from the group consisting of Ta, MP35N, and Nb and combinations thereof, and an outer layer over the shell including a material chosen from the group consisting of Pt and Pt—Ir and combinations thereof.

Claims

1. A composite wire comprising:

an embedded strand wire including an Ag embedding matrix and a plurality of filaments including Ta within the matrix; and

a shell around the embedding matrix including a material chosen from the group consisting of Ta, Pt, and Pt—

Ir and combinations thereof.

2. The composite wire of claim 1, wherein the plurality of filaments includes six or more filaments.

3. The composite wire of claim 1, wherein a volume fraction of the matrix is 15% to 40% of a total volume of the composite wire.

4. The composite wire of claim 1, wherein the shell consists of Pt—

Ir.

5. The composite wire of claim 1, wherein the shell consists of Pt.

6. The composite wire of claim 1, wherein the shell consists of Ta.

7. The composite wire of claim 1, wherein each of the filaments further includes Ag.

8. The composite wire of claim 1, wherein each of the filaments further includes Rh.

9. The composite wire of claim 1, wherein each of the filaments includes a bi-layer structure including a Ta core and a shell around the core including a material chosen from the group consisting of Pt—

Ir, Pt, Nb, cobalt alloy, stainless steel, and combinations thereof.

10. The composite wire of claim 1, wherein each of the filaments includes a bi-layer structure having a core including a material chosen from the group consisting of Ag, Au, and Mo, and combinations thereof, and a shell around the core including Ta.

11. The composite wire of claim 1, wherein each of the filaments includes a bi-layer structure having a core including Ir and a shell around the core including Ta.

12. An implantable lead comprising:

an implantable lead body extending from a distal end to a proximal end;

a conductor disposed within the lead body, the conductor including a composite wire comprising;

an embedded strand wire including an Ag embedding matrix and a plurality of filaments including Ta within the matrix; and

a shell around the embedding matrix including a material chosen from the group consisting of Ta, Pt, and Pt—

Ir and combinations thereof.

13. The implantable lead of claim 12, wherein the plurality of filaments includes six or more filaments.

14. The implantable lead of claim 12 wherein a volume fraction of the matrix is 15% to 40% of a total volume of the composite wire.

15. The implantable lead of claim 12, wherein wherein the shell consists of Pt—

Ir.

16. The composite wire of claim 12, wherein the shell consists of Pt.

17. The composite wire of claim 12, wherein the shell consists of Ta.

18. The composite wire of claim 12, wherein each of the filaments further includes Ag.

19. The composite wire of claim 12, wherein each of the filaments further includes Rh.

20. The composite wire of claim 12, wherein each of the filaments includes a bi-layer structure including a Ta core and a shell around the core including a material chosen from the group consisting of Pt—

Ir, Pt, Nb, cobalt alloy, stainless steel, and combinations thereof.

21. The composite wire of claim 12, wherein each of the filaments includes a bi-layer structure having a core including a material chosen from the group consisting of Ag, Au, and Mo, and combinations thereof, and a shell around the core including Ta.

22. The composite wire of claim 12, wherein each of the filaments includes a bi-layer structure having a core including Ir and a shell around the core including Ta.