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Pacemaker system with automatic event-programmed switching between unipolar and bipolar operation

  • US 4,549,548 A
  • Filed: 09/14/1983
  • Issued: 10/29/1985
  • Est. Priority Date: 09/14/1983
  • Status: Expired due to Term
First Claim
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1. Pacemaker apparatus having an implantable pacemaker, said pacemaker having stimulus means for generating stimulus pulses, sensing means for sensing heart signals, and cyclic means for controlling said pacemaker to carry out cyclic operation, a lead with at least two spaced lead electrodes thereon, and an indifferent electrode, comprising:

  • connection means for controllably connecting said sensing means and said stimulus means to respective selected ones of a plurality of combinations of said lead electrodes and said indifferent electrode;

    selection means for selecting respective first and second ones of said combinations for sensing of respective heart signals at different times during a cycle of pacemaker operation; and

    control means for controlling said connection means in accordance with said selected combinations

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