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RATE METER, PARTICULARLY A BEAT-BY-BEAT CARDIOTACHOMETER

  • US 3,602,222 A
  • Filed: 09/16/1968
  • Issued: 08/31/1971
  • Est. Priority Date: 09/16/1968
  • Status: Expired due to Term
First Claim
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1. In apparatus for processing electrocardiographic signals including recurring R-waves which are representative of the heart beats of a patient, the combination of:

  • terminal means for receiving said electrocardiographic signals;

    amplifier means connected to said terminal means for amplifying said electrocardiographic signals;

    filter means connected to said amplifier means for transmitting said R-waves while attenuating the remainder of said electrocardiographic signals whereby to transmit only said Rwaves;

    level-detecting means connected to said filter means, said level detecting means including means responsive to said R-waves for establishing a time varying threshold level proportional to the magnitude of said R-waves, said level-detecting means being so designed that said threshold level is exceeded only by said Rwaves, whereby only said R-waves are transmitted therethrough;

    multivibrator means connected to said level-detecting means for producing a pair of coincident beat pulses in response to each of said R-waves;

    signal-generating means responsive to each pair of said beat pulses for producing a set of control signals in response thereto;

    first and second integrating means, each being selectively operable for generating output signals representative of its time interval of operation, said first and second integrating means being responsive to said sets of control signals to be alternately operated during the time intervals between successive ones of said R-waves whereby said first integrating means produces a first series of output signals proportional to the beat-by-beat rate of the even occurring ones of said Rwaves, and said second integrating means produces a second series of output signals proportional to the beat-by-beat rate of the odd occurring ones of said R-waves; and

    means connected to said first and second integrating means for displaying said first and second series of said output pulses.

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