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Implantable endocardial lead with self-healing retractable fixation apparatus

  • US 5,593,433 A
  • Filed: 12/19/1994
  • Issued: 01/14/1997
  • Est. Priority Date: 12/19/1994
  • Status: Expired due to Term
First Claim
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1. A lead assembly for implantation in a patient, the assembly comprising:

  • a catheter adapted for insertion into a chamber of the patient'"'"'s heart having a proximal end and a distal end and a lumen extending therethrough from said proximal end to said distal end thereof;

    an electrode slidingly received within said lumen at said distal end of said catheter,a coil conductor having at least one wire attached to said electrode and being disposed within said lumen and adapted to transmit electrical impulses between the electrode and said proximal end of said catheter, said coil conductor having an inside diameter;

    fixation means for securing said electrode to the lining of the heart chamber, the fixation means being adapted to fit within the lumen of said catheter;

    a wire coil attached to said electrode, said coil having an inside diameter smaller than said inside diameter of said coil conductor and said wire coil is disposed along said at least one wire of said coil conductor; and

    a stylet having a distal end and a threaded segment at said distal end thereof, said threaded segment being adapted to engage said wire coil, whereby said wire coil can be displaced into said coil conductor by said threaded segment of said stylet, thereby disengaging said stylet by expanding said inner diameter of said wire coil, said wire coil being restored to its original inner diameter after removal of said threaded segment from said wire coil.

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