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Bipolar myocardial positive fixation lead with improved sensing capability

  • US 5,085,218 A
  • Filed: 08/31/1990
  • Issued: 02/04/1992
  • Est. Priority Date: 08/31/1990
  • Status: Expired due to Term
First Claim
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1. A bipolar, positive fixation myocardial screw-in lead comprising:

  • (a) an elongated flexible plastic lead body having a proximal end and a distal end;

    (b) first and second elongated flexible conductors extending through said lead body from said proximal end to said distal end, said first and second conductors being insulated from one another within said lead body;

    (c) an enlarged insulating electrode supporting lead head affixed to said distal end of said lead body, said lead head having a generally planar exterior surface;

    (d) a first conductive, generally rigid, helically-shaped electrode of open convolutions having one end supported by said head and extending normally to said planar exterior surface and terminating in a free end and being electrically connected to said first conductor;

    (e) a second conductive, generally rigid, helically-shaped electrode of substantially open but closely spaced convolutions sufficient to allow tissue ingrowth and formed as an annulus of generally round cross-section and supported on said planar exterior surface surrounding said first electrode, said second electrode being electrically connected to said second conductor.

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