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Reset means for programmable digital cardiac pacemaker

  • US 4,241,736 A
  • Filed: 11/06/1978
  • Issued: 12/30/1980
  • Est. Priority Date: 11/06/1978
  • Status: Expired due to Term
First Claim
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1. In a programmable medical device having program acceptance means responsive to an externally applied programming signal consisting of at least a minimum number of detectable pulses, and program memory means for providing device operating conditions in accordance with said programming signal, the improvement comprising:

  • pulse counter means for counting said programming pulses and providing a check signal indicating that the proper number of programming pulses have been received to constitute a programming instruction;

    means responsive to said check signal for enabling said program acceptance means to store the programming signal in said program memory means; and

    timing means responsive to said pulse counter means having a non-initial count therein for resetting said pulse counter means to an initial count a certain time after said pulse counter means first reaches said non-initial count unless said check signal first occurs, said certain time being greater than the time required to apply said programming signal.

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