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Electrosurgical instrument for ablating endocardial tissue

  • US 5,083,565 A
  • Filed: 08/03/1990
  • Issued: 01/28/1992
  • Est. Priority Date: 08/03/1990
  • Status: Expired due to Fees
First Claim
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1. An endocardial electrosurgical catheter for locating and subsequently ablating an ectopic foci in a patient'"'"'s heart, comprising:

  • (a) an elongated, flexible, plastic tubular catheter body having a proximal end, a distal end, an outer surface and at least one lumen extending from said proximal end to said distal end;

    (b) bipolar surface electrodes affixed to said outer surface of said catheter body at longitudinally spaced apart locations approximate said distal end of said catheter body;

    (c) first and second elongated, conductive wires extending through said lumen and electrically joined, individually, to said first and second bipolar surface electrodes at one end;

    (d) means connected to the other end of said first and second conductive wires for coupling said first and second conductive wires to EKG monitoring/recorder means;

    (e) third and fourth elongated conductive wires, each having a proximal end and a distal end and extending through said lumen, said third and fourth conductive wires being insulated from one another and longitudinally movable within said lumen;

    (f) insulative spacer means disposed in said lumen at said distal end of said catheter body for maintaining said distal ends of said third and fourth wires laterally spaced relative to one another, said distal ends of said third and fourth wires being free of insulation; and

    (g) means affixed to said proximal end of said catheter body and to said third and fourth wires for longitudinally moving said third and fourth wires from a retracted position wherein said distal ends of said third and fourth wires are unexposed relative to said distal end of said tubular catheter body and an exposed position wherein said distal ends of said third and fourth wires extend beyond of said distal end of said tubular catheter body.

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