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Lead assembly with masked microdisk tip electrode and monolithic controlled release device

  • US 6,405,091 B1
  • Filed: 07/20/1999
  • Issued: 06/11/2002
  • Est. Priority Date: 07/20/1999
  • Status: Expired due to Fees
First Claim
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1. A passive fixation body implantable lead assembly adapted to transmit electrical signals between a proximal end portion of the lead assembly and a distal end portion of the lead assembly and to thereby stimulate selected body tissue and/or sense electrical signals therefrom, the lead assembly having a longitudinal axis and comprising:

  • an electrical conductor extending between said proximal and distal end portions of the lead assembly for transmitting the electrical signals, the conductor having a distal end;

    a sheath of insulative, biocompatible material enclosing the electrical conductor for electrically insulating the conductor from body tissue and body fluids, the insulative sheath having a distal extremity;

    a tip electrode electrically connected to the distal end of the electrical conductor, the tip electrode being in the form of a cylinder disposed coaxially of the longitudinal axis of the lead assembly, the tip electrode having a side surface and a distal extremity comprising a generally planar active electrode surface extending substantially perpendicular to the longitudinal axis of the assembly; and

    a thin dielectric insulating layer covering substantially the entire side surface of the tip electrode.

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