Termination of a shield within an implantable medical lead

Patent metadata

Field	Value
Publication number	US-11458306-B2
Application number	US-201816145600-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Apr 30, 2009
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

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. The 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 a shield within a jacket of an implantable medical lead, comprising:
providing the shield between an inner insulation layer of the jacket and an outer insulation layer of the jacket, the shield terminating by the end of the inner insulation layer, the outer insulation layer terminating prior to an end of the shield and the inner insulation layer;
bonding an insulation extension layer onto the end of the inner insulation layer with the insulation extension layer being in direct contact with the end of the inner insulation layer at a point where the inner insulation layer terminates;
positioning a replacement outer insulation layer to be radially spaced over the shield and inner insulation layer where the outer insulation layer is not present, the replacement outer insulation layer extending beyond the end of the inner insulation layer to also extend over and directly contact the insulation extension layer, the replacement outer insulation layer being bonded to an end of the outer insulation layer, and the replacement outer insulation layer comprising a material having a stiffer durometer rating than a material forming the outer insulation layer; and
forcing the shield to sink into the inner insulation layer at a span along the inner insulation layer that is beyond the end of the outer insulation layer prior to positioning the replacement outer insulation layer.

2. The method of claim 1 , further comprising removing a portion of the outer insulation layer so that the outer insulation layer of the jacket terminates prior to the end of the shield and the inner insulation layer.

3. The method of claim 1 , wherein the replacement outer insulation layer terminates before an end of the insulation layer extension on an opposite side of the insulation layer extension from the bond to the inner insulation layer.

4. The method of claim 3 , further comprising providing a stimulation electrode at the termination of the replacement outer insulation layer and over the insulation layer extension.

5. The method of claim 1 , wherein positioning the replacement outer insulation layer over the shield and the inner insulation layer comprises sliding the replacement outer insulation layer in place.

6. The method of claim 1 , wherein positioning the replacement outer insulation layer over the shield and the inner insulation layer comprises injection molding the replacement outer insulation layer in place.

7. 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.

8. The method of claim 1 , further comprising providing barbs spanning between the inner insulation layer and the insulation extension layer.

9. An implantable medical lead, comprising:
an inner insulation layer;
an outer insulation layer surrounding the inner insulation layer;
a shield between the inner insulation layer and the outer insulation layer, the shield terminating by the end of the inner insulation layer, the outer insulation layer terminating prior to an end of the shield and the inner insulation layer;
an insulation extension layer bonded onto the end of the inner insulation layer with the insulation extension layer being in direct contact with the end of the inner insulation layer at a point where the inner insulation layer terminates; and
a replacement outer insulation layer positioned to be radially spaced over the shield and inner insulation layer where the outer insulation layer is not present, the replacement outer insulation layer extending beyond the end of the inner insulation layer to also extend over and directly contact the insulation extension layer, the replacement outer insulation layer being bonded to an end of the outer insulation layer, and the replacement outer insulation layer comprising a material having a stiffer durometer rating than a material forming the outer insulation layer, wherein the shield is sunken into the inner insulation layer at a span along the inner insulation layer that is beyond the end of the outer insulation layer.

10. The implantable medical lead of claim 9 , wherein the replacement outer insulation layer terminates before an end of the insulation extension layer on an opposite side of the inner insulation extension layer from the bond to the inner insulation layer.

11. The implantable medical lead of claim 9 , further comprising a stimulation electrode at the termination of the replacement outer insulation layer and over the insulation extension layer.

12. The implantable medical lead of claim 9 , wherein the replacement outer insulation layer is a pre-formed tube.

13. The implantable medical lead of claim 9 , wherein the replacement outer insulation layer is injection molded.

14. The implantable medical lead of claim 9 , 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 individually folded over.

15. The implantable medical lead of claim 9 , further comprising:
at least one filar surrounded by the inner insulation layer, the at least one filar extending beyond the end of the outer 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 layer once beyond the end of the inner insulation layer.

16. The implantable medical lead of claim 9 , further comprising barbs spanning between the inner insulation layer and the insulation extension layer.

17. An implantable medical lead, comprising:
an inner insulation layer;
an outer insulation layer surrounding the inner insulation layer;
a shield between the inner insulation layer and the outer insulation layer, the shield terminating by the end of the inner insulation layer, the outer insulation layer terminating prior to an end of the shield and the inner insulation layer;
an insulation extension layer bonded onto the end of the inner insulation layer with the insulation extension layer being in direct contact with the end of the inner insulation layer at a point where the inner insulation layer terminates; and
a replacement outer insulation layer positioned to be radially spaced over the shield and inner insulation layer where the outer insulation layer is not present, the replacement outer insulation layer extending beyond the end of the inner insulation layer to also extend over and directly contact the insulation extension layer, the replacement outer insulation layer being bonded to an end of the outer insulation layer, and the replacement outer insulation layer comprising a material having a stiffer durometer rating than a material forming the outer insulation layer, 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 a ring that covers the ends of the plurality of wires, the ring being covered by the outer insulation layer.

18. A method of terminating a shield within a jacket of an implantable medical lead, comprising:
providing the shield between an inner insulation layer of the jacket and an outer insulation layer of the jacket, the shield terminating by the end of the inner insulation layer, the outer insulation layer terminating prior to an end of the shield and the inner insulation layer;
bonding an insulation extension layer onto the end of the inner insulation lay

Assignees

• Medtronic Inc

Inventors

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

Classifications

• Y10T29/4921

  with bonding · CPC title

• A61N1/048

  Electrodes characterised by a specific connection between lead and electrode · CPC title

• A61N1/05

  for implantation or insertion into the body, e.g. heart electrode (A61N1/06 takes precedence) · CPC title

• Y10T29/49826

  Assembling or joining · CPC title

• Y10T29/49016

  Antenna or wave energy "plumbing" making · CPC title