Composite wire for implantable cardiac lead conductor cable and coils

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.

1 . 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 including:   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 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.   
   
   
       2 . The implantable lead of  claim 1 , wherein the core includes an embedded strand construction. 
   
   
       3 . The implantable lead of  claim 1 , wherein the wire includes a diameter of about 0.0008 inches to about 0.010 inches. 
   
   
       4 . The implantable lead of  claim 1 , wherein a cross-sectional area of the core is about 5% to about 50% of a cross-sectional area of the composite wire. 
   
   
       5 . The implantable lead of  claim 1 , wherein a cross-sectional area of the outer layer is about 2% to about 20% of a cross-sectional area of the composite wire. 
   
   
       6 . The implantable lead of  claim 1 , wherein the composite wire is cold-drawn. 
   
   
       7 . The implantable lead of  claim 1 , wherein the composite wire is heat treated. 
   
   
       8 . 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:   a core including a material chosen from the group consisting of Ag and Au and combinations thereof;   a shell around the core including a material chosen from the group consisting of Ta and Nb and combinations thereof; and   an outer layer over the shell including a material chosen from the group consisting of Pt, Pt—Ir, MP35N, and stainless steel and combinations thereof.   
   
   
       9 . The implantable lead of  claim 8 , wherein the core includes an embedded strand construction. 
   
   
       10 . The implantable lead of  claim 8 , wherein the wire includes a diameter of about 0.0008 inches to about 0.010 inches. 
   
   
       11 . 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:   a core including a material chosen from the group consisting of Ag, Au, Rh, Mo, alloy of Ta and Mo, Cu, Ir, Ta, and Ti and combinations thereof;   a shell around the core including a material chosen from the group consisting of stainless steel, Ta, and MP35N and combinations thereof; and   an outer layer over the shell including a material chosen from the group consisting of Ag, Ta, Ti, stainless steel, MP35N, and Nb and combinations thereof.   
   
   
       12 . The implantable lead of  claim 11 , wherein the core includes a material chosen from the group consisting of Ag, Au, Rh, Mo, Cu, and Ir, and combinations thereof. 
   
   
       13 . The implantable lead of  claim 11 , wherein a cross-sectional area of the core is about 5% to about 50% of a cross-sectional area of the composite wire. 
   
   
       14 . 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:   a core including a material chosen from the group consisting of Ag, Au, Rh, Mo, alloy of Ta and Mo, Cu, Ir, Ta, and Ti and combinations thereof;   a shell around the core including a material chosen from the group consisting of Ta, and MP35N and combinations thereof; and   an outer layer over the shell including a material chosen from the group consisting of Ag, Ta, Rh, stainless steel, MP35N, and Nb and combinations thereof.   
   
   
       15 . The implantable lead of  claim 14 , wherein the core includes a material chosen from the group consisting of Ag, Au, Rh, Mo, Cu, and Ir, and combinations thereof. 
   
   
       16 . The implantable lead of  claim 14 , wherein a cross-sectional area of the core is about 5% to about 50% of a cross-sectional area of the composite wire. 
   
   
       17 . The implantable lead of  claim 14 , wherein the core consists of Mo, the shell consists of Ta, and the outer layer consists of MP35N. 
   
   
       18 . 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 bi-material composite wire comprising:   an inner core including a material chosen from the group consisting of Ta, Ag, Rh, Au, Ti, Cu, or Ir and combinations thereof; and   an outer shell around the core including a material chosen from the group consisting of Nb, Pt, and Pt—Ir, and combinations thereof.   
   
   
       19 . The implantable lead of  claim 18 , wherein the core consists of Ag, and the shell consists of Pt. 
   
   
       20 . The implantable lead of  claim 18 , wherein the core consists of Ag or Au, and the shell consists of Pt or Pt—Ir.