×

Demand heart pacer

  • US 3,926,197 A
  • Filed: 01/04/1974
  • Issued: 12/16/1975
  • Est. Priority Date: 01/04/1974
  • Status: Expired due to Term
First Claim
Patent Images

1. A heart pacer for producing heart stimulation pulses in the absence of naturally occurring heart pulses, comprising:

  • a voltage source;

    a pair of electrodes, at least one of which is connectable to the heart;

    means connected to said electrodes for detecting naturally occurring heart pulses and for generating an inhibiting pulse corresponding to each detected natural heart pulse;

    means connected to said voltage source, including a timing capacitor, for generating stimulation pulses for delivery to said electrodes at a constant heartbeat rate independent of the voltage of said voltage source;

    means connected to said stimulation pulse generating means for discharging said timing capacitor to inhibit the generation of selected stimulation pulses;

    means connected to said detecting means refernced to said voltage source for generating in response to a naturally occurring heart pulse, a waveform having a time varying amplitude directly proportional to the voltage of said voltage source;

    means having a threshold activating voltage to which said waveform is applied connected for activating said capacitor discharging means during the time said waveform exceeds the threshold voltage to control the time said timing capacitor is discharged, thereby changing the heartbeat rate of said stimulation pulse generating means directly proportionally to said supply voltage; and

    , means for decoupling said waveform to prevent it from activating said stimulation pulse generating means to enable said stimulation pulse generating means to pulse without being inhibited to produce a reference heartbeat rate comparable to the heartbeat rate with said inhibiting means coupled, the difference between said heart beat rates being indicative of the voltage of said voltage source.

View all claims
  • 14 Assignments
Timeline View
Assignment View
    ×
    ×