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Heart pacemaker system with shape-memory metal components

  • US 4,913,147 A
  • Filed: 09/23/1987
  • Issued: 04/03/1990
  • Est. Priority Date: 09/23/1986
  • Status: Expired due to Term
First Claim
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1. A heart pacemaker system comprising:

  • a pacemaker;

    an electrode line having a proximal end connected to said pacemaker and a distal end, said proximal and distal ends defining a longitudinal direction therebetween;

    fixing means disposed at said distal end of said electrode line for interacting with a wall of the heart of a patient to assist in retention of said distal end of said electrode line against said wall of the heart of a patient, said electrode line having an outer radial diameter adapted for permitting insertion of said electrode line through a vein of said patient; and

    a component consisting of shape-memory metal separate from but in contact with said fixing means which assumes a first shape at a first temperature which maintains said fixing means substantially at said outer radial diameter of said electrode line, and which assumes a second shape at a second temperature causing said fixing means at said distal end to project radially beyond said outer diameter, said second shape differing from said first shape only by being radially larger than said first shape.

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