Pacemaker with improved shelf storage capacity

  • US 5,522,856 A
  • Filed: 09/20/1994
  • Issued: 06/04/1996
  • Est. Priority Date: 09/20/1994
  • Status: Expired due to Term
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First Claim
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1. A pacemaker system having an implantable pacemaker with a battery for providing energy, and pacemaker circuitry powered by said battery for carrying out pacemaker functions, said functions including generating pace pulses for delivery to a patient'"'"'s heart, at least some portion of said pacemaker circuitry having a low current standby mode of operation and a normal operational mode of operation, said system further comprising, when said pacemaker is implanted in a patient, a lead for providing an electrical connection between said pacemaker and said patient, further comprising:

  • means for initially holding said portion of pacemaker circuitry in said standby mode when said lead is not operatively connected thereto;

    detecting means for detecting when said pacemaker and said lead are operatively connected, and response means responsive to said detected connection to place said portion of pacemaker circuitry in said normal operational mode; and

    wherein said pacemaker circuitry comprises a pace generator which cyclically produces pace pulses in both said standby and operational modes, and wherein said detecting means comprises means for detecting when there is a current above a predetermined threshold associated with pace pulses generated by said pulse generator, thereby sensing when a load has been placed across said pacemaker output.

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