Termination of a shield within an implantable medical lead

Patent metadata

Field	Value
Publication number	US-10086194-B2
Application number	US-201013264179-A
Country	US
Kind code	B2
Filing date	Apr 27, 2010
Priority date	Apr 30, 2009
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A shield located within an implantable medical lead may be terminated in various ways. The shield may be terminated by butt, scarf, lap, or other joints between insulation layers surrounding the lead and an insulation extension. For lap joints, a portion of an outer insulation layer may be removed and a replacement outer insulation layer is positioned in place of the removed outer insulation layer, where the replacement layer extends beyond an inner insulation layer and the shield. The replacement layer may also lap onto a portion of the insulation extension. Barbs may be located between the replacement layer and the inner insulation layer or the insulation extension. The shield wires have ends at the termination point that may be folded over individually or may be capped with a ring located within one of the insulation layers of the jacket.

First claim

What is claimed is:

1. A method of terminating an electrically conductive shield within an outermost jacket of an implantable medical lead, comprising:
providing the electrically conductive shield between an inner insulation layer of the outermost jacket and an outermost insulation layer of the jacket, the outermost insulation layer being in direct contact with the electrically conductive shield, the electrically conductive shield terminating by a blunt end of the outermost insulation layer, the outermost insulation layer being outermost at the blunt end and being outermost where in direct contact with the electrically conductive shield, the outermost insulation layer having a tubular shape and having a planar surface that forms a plane that is perpendicular to a longitudinal axis of the tubular shape and that comprises the blunt end of the outermost insulation layer; and
bonding an insulation extension directly onto the planar surface forming the blunt end of the outermost insulation layer.

2. The method of claim 1 , further comprising removing a portion of the insulation extension that is spaced from a bond to the outermost insulation layer and providing a stimulation electrode at the removed portion.

3. The method of claim 1 , wherein the insulation extension is stiffer than the outermost insulation layer.

4. The method of claim 1 , wherein the shield comprises a plurality of wires, each wire of the plurality having an end at the shield termination, the method further comprising folding over the end of each wire of the plurality individually.

5. The method of claim 1 , wherein the shield comprises a plurality of wires, each wire of the plurality having an end at the shield termination, the method further comprising providing a ring that covers the ends of the plurality of wires, the ring being covered by the outermost insulation layer.

6. An implantable medical lead, comprising:
an inner insulation layer;
an outermost insulation layer of the lead surrounding the inner insulation layer;
an electrically conductive shield between the inner insulation layer and the outermost insulation layer of the lead, the outermost insulation layer being in direct contact with the electrically conductive shield, the electrically conductive shield terminating by a blunt end of the outermost insulation layer, the outermost insulation layer being outermost at the blunt end and being outermost where in direct contact with the electrically conductive shield, the outermost insulation layer having a tubular shape and having a planar surface that forms a plane that is perpendicular to a longitudinal axis of the tubular shape and that comprises the blunt end of the outermost insulation layer; and
an insulation extension bonded directly onto the planar surface forming the blunt end of the outermost insulation layer.

7. The implantable medical lead of claim 6 , wherein a portion of the insulation extension that is spaced from a bond to the outermost insulation layer is removed, the implantable medical lead further comprising a stimulation electrode being positioned about the inner insulation layer in place of the removed portion.

8. The implantable medical lead of claim 6 , wherein the insulation extension is stiffer than the outermost insulation layer.

9. The implantable medical lead of claim 6 , wherein the shield comprises a plurality of wires, each wire of the plurality having an end at the shield termination, the end of each wire of the plurality being folded over individually.

10. The implantable medical lead of claim 6 , wherein the shield comprises a plurality of wires, each wire of the plurality having an end at the shield termination, the implantable medical lead further comprising providing a ring that covers the ends of the plurality of wires, the ring being covered by the outermost insulation layer.

11. The implantable medical lead of claim 6 , further comprising:
at least one filar surrounded by the inner insulation layer, the at least one filar extending beyond the end of the outermost insulation layer, the end of the inner insulation layer, and the end of the shield, the at least one filar being surrounded by the insulation extension once beyond the end of the inner insulation layer.

12. A method of terminating an electrically conductive shield within an outermost jacket of an implantable medical lead, comprising:
providing the electrically conductive shield between an inner insulation layer of the outermost jacket and an outermost insulation layer of the jacket, the outermost insulation layer being in direct contact with the electrically conductive shield, the electrically conductive shield extending toward a proximal end of the lead and terminating by a blunt proximal end of the outermost insulation layer such that the electrically conductive shield does not extend more proximally than the blunt proximal end of the outermost insulation layer, the outermost insulation layer being outermost where in direct contact with the electrically conductive shield, the outermost insulation layer having a tubular shape and having a planar surface that forms a plane that is perpendicular to a longitudinal axis of the tubular shape and that comprises the blunt end of the outermost insulation layer; and
bonding an insulation extension directly onto the planar surface forming the blunt end of the outermost insulation layer.

13. A method of terminating an electrically conductive shield within an outermost jacket of an implantable medical lead, comprising:
providing the electrically conductive shield between an inner insulation layer of the outermost jacket and an outermost insulation layer of the jacket, the outermost insulation layer being in direct contact with the electrically conductive shield, the electrically conductive shield terminating by a blunt end of the outermost insulation layer, the outermost layer being outermost at the blunt end, the electrically conductive shield comprising a plurality of wires, the outermost insulation layer having a tubular shape and having a planar surface that forms a plane that is perpendicular to a longitudinal axis of the tubular shape and that comprises the blunt end of the outermost insulation layer; and
bonding an insulation extension directly onto the planar surface forming the blunt end of the outermost insulation layer.

Assignees

• Kern Michael J
• Olsen James M
• Klardie Michael R
• Stone Richard T
• Cai Chad Q
• Bondhus Spencer M
• Conroy Mark J
• Abraham Timothy R
• Stolz Brian T
• Medtronic Inc

Inventors

• Kern Michael J
• Olsen James M
• Klardie Michael R
• Stone Richard T
• Cai Chad Q
• Bondhus Spencer M
• Conroy Mark J
• Abraham Timothy R
• Stolz Brian T

Classifications

• Y10T29/49227

  Insulator making · CPC title

• Y10T29/4921

  with bonding · CPC title

• Y10T29/49016

  Antenna or wave energy "plumbing" making · CPC title

• A61N2001/0582

  Suture sleeves · CPC title

• A61N2001/058

  Fixing tools · CPC title