Implantable Lead Having an Elongated Lead Body

• US 20120103653A1
• Filed: 10/27/2011
• Published: 05/03/2012
• Est. Priority Date: 10/28/2010
• Status: Active Grant

• Current Assignee: Biotronik SE & Company KG
• Original Assignee: Biotronik SE & Company KG
• Inventors: Friedrich, Michael, Maxfield, Michelle, Frenzel, Timo, Buchner, Dagmar
• Granted Patent: US 9,101,757 B2
• Time in Patent Office: Days
• US Class Current: 174/108
• 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; and

a function conductor extending in a longitudinal direction of the elongated lead 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 an outside alternating magnetic field by generating an induction field that is in an opposite direction of the outside magnetic field.

2. The implantable lead according to claim 1, wherein the implantable lead is configured as an electrode lead having an electrode connection at a proximal end and at least one stimulating, sensing and/or shock electrode at or close to a distal end, wherein the function conductor extends between the electrode connection and the electrode and is partially or completely coiled over the length thereof, and wherein the field decoupling conductor loop acting as a field decoupling means comprises a field decoupling conductor in the form of a field decoupling coil, which is wound in the function conductor or runs coaxially or parallel to the function conductor and is functionally independent thereof and insulate there from.

3. The implantable lead according to claim 2, wherein the electrode lead comprises a first and a second proximal electrode connection and a first and a second distal electrode, with a first function conductor extending between the first proximal electrode connection and the first distal electrode, and 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, and wherein the field conducting conductor loop acting as the field decoupling means comprises 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 could at one or at several positions over the length of the electrode lead body.

4. The implantable lead according to claim 3, wherein the first field decoupling coil is proximally and distally connected to the second field decoupling coil by a conductive ring or coil section acting as a sliding contact.

5. The implantable lead according to claim 4, wherein the conductive ring 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 is in sliding contact with the first and second field decoupling coils.

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 coils distally from the 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 the electrical contact between the function conductor and the electrode.

7. 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 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.

8. An implantable lead comprising:

an elongated lead body; and

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

a field decoupling conductor also extending in a longitudinal direction of the elongated lead body and independent of the function conductor, the field decoupling conductor having no medical function, where the field decoupling conductor forms a closed conductor loop which reduces coupling of the function conductor to an outside alternating magnetic field by generating an induction field that is in an opposite direction of the outside alternating magnetic field.