Electromagnetic interference immune pacing/defibrillation lead

• US 7,801,625 B2
• Filed: 05/27/2005
• Issued: 09/21/2010
• Est. Priority Date: 05/27/2005
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: MacDonald, Stuart G.
• Primary Examiner(s): Layno; Carl H
• Assistant Examiner(s): SARCIONE, JESSICA LYNN
• Application Number:
  US11/140,066
• Publication Number:
  US 20060271141A1
• Time in Patent Office: 1,943 Days
• Field of Search: 607 1- 2, 607/116, 607/122, 333/12, 333/206, 333222-223, 333/243, 333/253, 333/182, 174/34, 174/36, 428/329, 600/373, 600410-412
• US Class Current: 607/119
• CPC Class Codes: A61N 1/04 Electrodes electrosurgical electrodes A61B18/14
• CPC Class Codes: A61N 1/0563 specially adapted for defibrillation or cardioversion
• CPC Class Codes: A61N 1/086 Magnetic resonance imaging [MRI] compatible leads
• CPC Class Codes: Y10S 128/908 Patient protection from electric shock

Abstract

An electromagnetic interference immune defibrillator lead has a first electromagnetic insulating layer. A first layer is formed on the first electromagnetic insulating layer, the first layer having a plurality of first conductive rings composed of first conductive material, each first conductive ring being separated by first insulating material. A second electromagnetic insulating layer is formed on the first layer. A second layer is, formed on the second electromagnetic insulating layer, the second layer having a plurality of second conductive rings composed of second conductive material, each second conductive ring being separated by second insulating material. A third electromagnetic insulating layer is formed on the second layer. The second conductive rings of second conductive material are positioned such that a second conductive ring overlaps a portion of a first conductive ring and overlaps a portion of a second conductive ring, the second conductive ring being adjacent to the first conductive ring. The second electromagnetically insulating layer is composed of a self-healing dielectric material.

Claims

1. A magnetic resonance imaging (MRI) electromagnetic interference immune modular defibrillation lead, comprising:

a defibrillation lead body;

a defibrillation conductor disposed within the lead body and having a first plurality of coplanar conductive elements capacitively coupled to adjacent conductive elements and disposed within a dielectric material within the defibrillation lead body; and

a second plurality of conductive elements each being non-coplanar with the first plurality of coplanar conductive elements, each of the second plurality of conductive elements capacitively coupled to adjacent conductive elements and capacitively coupled to adjacent conductive elements of the first plurality of coplanar conductive elements, and disposed within the dielectric material within the defibrillation lead body;

wherein, a defibrillation signal can be effectively conducted along the defibrillation conductor due to the dielectric material having a dielectric voltage threshold less than a voltage produced by the defibrillation signal while MRI electromagnetic interference is not conducted along the defibrillation conductor due to the dielectric material having a dielectric voltage threshold greater than a voltage induced by the MRI electromagnetic interference.

2. The electromagnetic interference immune modular defibrillation lead as claimed in claim 1, wherein said dielectric material is self-healing and is composed of cellulose triacetate.

3. The electromagnetic interference immune modular defibrillation lead as claimed in claim 2, which includes a pacing conductor disposed with the defibrillation lead body.

4. The electromagnetic interference immune modular defibrillation lead as claimed in claim 1, wherein said dielectric material is self-healing and which includes a pacing conductor disposed with the defibrillation lead body.

5. The electromagnetic interference immune modular defibrillation lead as claimed in claim 1, which includes a pacing conductor disposed with the defibrillation lead body.

6. A magnetic resonance imaging (MRI) electromagnetic interference immune modular defibrillation lead, comprising:

a defibrillation lead body;

a defibrillation conductor disposed within the lead body and having a first plurality of coplanar conductive elements capacitively coupled to adjacent conductive elements and disposed within a self-healing dielectric material within the defibrillation lead body; and

a second plurality of conductive elements each being non-coplanar with the first plurality of coplanar conductive elements, each of the second plurality of conductive elements capacitively coupled to adjacent conductive elements and capacitively coupled to adjacent conductive elements of the first plurality of coplanar conductive elements, and disposed within the self-healing dielectric material within the defibrillation lead body;

wherein, a defibrillation signal can be effectively conducted along the defibrillation conductor due to the dielectric material having a dielectric voltage threshold less than a voltage produced by the defibrillation signal while MRI electromagnetic interference is not conducted along the defibrillation conductor due to the dielectric material having a dielectric voltage threshold greater than a voltage induced by the MRI electromagnetic interference.

7. The electromagnetic interference immune modular defibrillation lead as claimed in claim 6, wherein said self-healing dielectric material is composed of cellulose triacetate.

8. The electromagnetic interference immune modular defibrillation lead as claimed in claim 7, which includes a pacing conductor disposed with the defibrillation lead body.

9. The electromagnetic interference immune modular defibrillation lead as claimed in claim 6, which includes a pacing conductor disposed with the defibrillation lead body.

10. A magnetic resonance imaging (MRI) electromagnetic interference immune modular defibrillation lead, comprising:

a defibrillation lead body; and

a defibrillation conductor disposed within the lead body the defibrillation conductor having patches of electrically conductive material with patches of insulating material between the patches of electrically conductive material;

wherein, a defibrillation signal can be effectively conducted along the defibrillation conductor due to the insulating material having a dielectric voltage threshold less than a voltage produced by the defibrillation signal while MRI electromagnetic interference is not conducted along the defibrillation conductor due to the insulating material having a dielectric voltage threshold greater than a voltage induced by the MRI electromagnetic interference.

11. The electromagnetic interference immune modular defibrillation lead as claimed in claim 10, wherein said insulating material comprises a self-healing dielectric material.

12. The electromagnetic interference immune modular defibrillation lead as claimed in claim 10, which includes a pacing conductor disposed within the defibrillator lead body.

13. The electromagnetic interference immune modular defibrillation lead as claimed in claim 12, wherein the defibrillation conductor shields the pacing wire from the MRI electromagnetic interference.