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Pacing, Sensing or Defibrillator Leads for Implantation into the Myocardium

  • US 20120245665A1
  • Filed: 09/02/2010
  • Published: 09/27/2012
  • Est. Priority Date: 09/03/2009
  • Status: Active Grant
First Claim
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1. An electrical lead for a cardiac device, the electrical lead comprising:

  • a lead body having a proximal end and a distal end, the lead body sized for insertion through a lumen of a steerable sheath;

    a first electrode and a second electrode having opposite polarity and extending through the lead body, the first and second electrodes each terminating in a tip having a proximal end, a distal end, and an effective length, the tip of the first and second electrodes arranged to extend from the lead body for insertion into an area of cardiac tissue;

    the tip of the first electrode including a fully insulated portion on the proximal end and a fully insulated portion on the distal end, each of the fully insulated portions measuring in a range between 5 percent and 40 percent of an effective length of the tip of the first electrode, the tip of the first electrode further including an intermediate section having an uninsulated portion; and

    the tip of the second electrode comprising a helical section surrounding a portion of the tip of the first electrode, the helical section comprising an outwardly facing portion facing away from the first electrode and an inwardly facing portion facing toward the first electrode, the tip of the second electrode including a fully insulated portion on the proximal end and a partially insulated portion extending from the fully insulated portion toward the distal end, the fully insulated portion on the proximal end measuring in a range between 5 percent and 40 percent of an effective length of the tip of the second electrode, the partially insulated portion formed by insulation on the inwardly facing portion of the second electrode.

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