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Cardio-pulmonary activity monitor

  • US 4,757,825 A
  • Filed: 10/31/1985
  • Issued: 07/19/1988
  • Est. Priority Date: 10/31/1985
  • Status: Expired due to Fees
First Claim
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1. Apparatus for monitoring cardiopulmonary activity of an individual and for providing an indication of abnormal activity comprising:

  • electrostatic charge collection means for positioning adjacent an individual whose cardiopulmonary activity is to be monitored said collection means having at least first and second spaced layers separated by an electrically insulative layer;

    a dual integrator connected to said collection means for providing an output signal representative of changes in the electrostatic charge on said collection means occurring at a frequency between 0.1 Hz and 15 Hz;

    an amplifier connected in a feedback circuit between an output terminal of said dual integrator and an input terminal thereof, said amplifier having a relatively high gain at frequencies below 0.1 Hz and a relatively low gain at frequencies above 0.1 Hz whereby the output signal of said dual integrator remains substantially at a predetermined value for input signals below 0.1 Hz in frequency; and

    means connected to the output terminal of said dual integrator for providing an indication of the status of the cardiopulmonary activity.

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