×

Digital cardiac pacemaker with refractory, reversion and sense reset means

  • US 4,250,883 A
  • Filed: 11/06/1978
  • Issued: 02/17/1981
  • Est. Priority Date: 11/06/1978
  • Status: Expired due to Term
First Claim
Patent Images

1. A digital cardiac pacemaker pulse generator comprising:

  • a pair of output terminals, at least one of which is adapted to be electrically coupled through lead means to the heart;

    sensing means for providing a signal manifesting the detection of electrical heart signals at said output terminals; and

    digital control means including clock means for providing a series of clock signals, resettable counter means for counting said clock signals, output means responsive to said counter means reaching a certain count for providing an output signal to said terminals and reset means for resetting said counter means to an initial count, said reset means further comprising;

    means coupled to said counter means for providing a first predetermined refractory count and a certain blank count of said counter means;

    resettable fixed time measuring means which provides a signal a fixed time after being reset, said fixed time means being reset as a result of the provision of an output signal by said control means and further being reset by the occurrence of a sensing means signal after said certain blank time following said counter means being reset for resetting said counter means in response to said sensing means signal if said sensing means signal occurs after said first predetermined refractory count of said counter is reached and further if said sensing means signal occurs after the expiration of said fixed time measured from the last occurring one of an output signal or a signal provided by said sensing means after said certain blank count following the previous resetting of said counter means is reached.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×