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Implantable medical lead designs

  • US 8,010,207 B2
  • Filed: 04/21/2003
  • Issued: 08/30/2011
  • Est. Priority Date: 10/31/2002
  • Status: Active Grant
First Claim
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1. A medical lead comprising:

  • a first coiled portion including N filar(s) extending along a first segment of the lead; and

    a second coiled portion electrically coupled to the first coiled portion, the second coiled portion including N+M filars extending along a second segment of the lead, the N+M filars producing increased stiffness of the second coiled portion relative to the first coiled portion, wherein N and M are positive integers, the second coiled portion being located at a more distal end of the medical lead relative to the first coiled portion;

    wherein the M filar(s) in the second coiled portion form M filar coils in the second coiled portion;

    wherein the N filar(s) in the second coiled portion form N filar coils in the second coiled portion;

    wherein at least one M filar coil in the second coiled portion has a coil diameter that is the same as a coil diameter of at least one of the N filar coils;

    an electrode located on a distal tip of the medical lead, the electrode being electrically coupled to the second coiled portion; and

    an electrically conductive bus to electrically couple the N filar(s) of the first coiled portion to the N+M filars of the second coiled portion.

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