Implantable lead having an elongated lead body

• US 9,101,757 B2
• Filed: 10/27/2011
• Issued: 08/11/2015
• Est. Priority Date: 10/28/2010
• Status: Expired due to Fees

• Current Assignee: Biotronik SE & Company KG
• Original Assignee: Biotronik SE & Company KG
• Inventors: Frenzel, Timo, Friedrich, Michael, Maxfield, Michelle, Buchner, Dagmar
• Primary Examiner(s): Koharski, Christopher D
• Assistant Examiner(s): So, Elizabeth K
• Application Number:
  US13/282,685
• Publication Number:
  US 20120103653A1
• Time in Patent Office: 1,384 Days
• US Class Current: 1/1
• CPC Class Codes: A61N 1/0563 specially adapted for defibrillation or cardioversion
• CPC Class Codes: A61N 1/086 Magnetic resonance imaging [MRI] compatible leads

Abstract

An implantable lead having an elongated lead body and a function conductor extending in the longitudinal direction of the conductor body, the function conductor being provided to implement a medical function of the lead, wherein in addition to the function conductor, a field decoupling conductor loop is provided, which reduces coupling of the function conductor to the outside alternating magnetic field by generating an induction field that is in the opposite direction of an outside magnetic field.

Claims

1. An implantable lead comprising:

an elongated lead body having a proximal end and a distal end;

a first and a second proximal electrode connection at the proximal end;

a first and a second stimulating, sensing and/or shock electrode at or close to the distal end;

a first function conductor extending between the first proximal electrode connection and the first distal electrode;

a second function conductor extending between the second proximal electrode connection and the second distal electrode, wherein the second function conductor is wound in a same or opposite direction as the first function conductor, the second function conductor being provided to implement a medical function of the lead;

a field conducting conductor loop acting as a field decoupling means, the field conducting conductor loop comprising;

a first functionally independent field decoupling coil, which is wound in the first function conductor in an insulated manner; and

a second functionally independent field decoupling coil, which is wound in the second function conductor in an insulated manner, wherein the second field decoupling coil is proximally and distally electrically connected to the first field decoupling coil at one or at several positions over the length of the electrode lead body by a conductive ring or coil section acting as a sliding contact;

wherein the conductive ring or the coil section is embedded in insulation located between the first and second function conductors and, hence, between the first field decoupling coil and the second field decoupling coil, wherein the conductive ring or the coil section is in sliding contact with the first and second field decoupling coils.

2. The implantable lead according to claim 1, wherein at the proximal end of the electrode lead the electrical contact is positioned between the first and second field decoupling coils distally from each electrode connection, and at the distal end of the electrode lead the electrical contact is positioned between the first and second field decoupling coils proximally from each electrical contact between each function conductor and each electrode.

3. An implantable lead comprising:

an elongated lead body;

an inner coil extending in a longitudinal direction of the elongated lead body, the inner coil comprising;

a first function conductor extending in a longitudinal direction of the elongated lead body, the first function conductor being provided to implement a medical function of the lead; and

a first field decoupling conductor also extending in a longitudinal direction of the elongated lead body and independent of the first function conductor, the first field decoupling conductor having no medical function; and

an outer coil extending in a longitudinal direction of the elongated lead body, the outer coil comprising;

a second function conductor extending in a longitudinal direction of the elongated lead body, the second function conductor being provided to implement a medical function of the lead; and

a second field decoupling conductor also extending in a longitudinal direction of the elongated lead body and independent of the second function conductor, the second field decoupling conductor having no medical function;

wherein the first and second field decoupling conductors are connected together at proximal and distal ends of the lead to form a closed conductor loop which reduces coupling of the first and second function conductors to an outside alternating magnetic field by generating an induction field that is in an opposite direction of the outside alternating magnetic field,

wherein the first field decoupling conductor is proximally and distally electrically connected to the second field decoupling conductor at one or at several positions over the length of the electrode lead body by a conductive ring or coil section acting as a sliding contact, and

wherein the conductive ring or the coil section is embedded in insulation located between the first and second function conductors and, hence, between the first field decoupling conductor and the second field decoupling conductor, wherein the conductive ring or the coil section is in sliding contact with the first and second field decoupling conductors.

4. The implantable lead according to claim 3, wherein the inner coil is wound in a same or opposite direction as the outer coil.

5. The implantable lead according to claim 3, wherein the outer coil is quadruple coiled having three wires forming the second function conductor and being provided to implement a medical function of the lead and one wire forming the second field decoupling conductor and having no medical function.

6. The implantable lead according to claim 3, wherein at the proximal end of the electrode lead the electrical contact is positioned between the first and second field decoupling conductors distally from each electrode connection, and at the distal end of the electrode lead the electrical contact is positioned between the first and second field decoupling conductors proximally from each electrical contact between each function conductor and each electrode.