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Cardiac signal transmitter unit

  • US 4,159,018 A
  • Filed: 03/03/1978
  • Issued: 06/26/1979
  • Est. Priority Date: 03/03/1978
  • Status: Expired due to Term
First Claim
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1. A cardiac signal transmission unit adapted to be operated from a self-contained power source, said transmission unit comprising:

  • (a) input electrode means adapted to be connected to a patient'"'"'s body for developing differential signals corresponding to the patient'"'"'s cardiac-related activities;

    (b) amplifier means connected to said input electrode means for providing amplified signals corresponding to the differential signals;

    (c) a voltage controlled oscillator (VCO) coupled to said amplifier means for providing output signals of a frequency corresponding to the amplitude of the amplified signal;

    (d) acoustical transducer means for providing an acoustical output; and

    (e) driver means comprising reference means adapted to be coupled directly across said self-contained power source for providing a relatively constant, reference level voltage, and switch means responsive to the output of said VCO for connecting the reference level voltage directly across the inputs of said acoustical transducer and for driving said acoustical transducer means with the relatively constant level voltage.

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