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Automatically configurable minute ventilation sensor

  • US 20040186526A1
  • Filed: 12/12/2003
  • Published: 09/23/2004
  • Est. Priority Date: 12/30/2002
  • Status: Active Grant
First Claim
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1. A minute ventilation sensing device, comprising:

  • excitation current electrodes for imposing a current field in the thoracic cavity;

    an exciter for supplying excitation current as an excitation current waveform at a specified excitation frequency and amplitude between the excitation current electrodes;

    a plurality of selectable voltage sense electrodes for generating a voltage sense signal corresponding to a potential difference between two points in the thoracic cavity;

    sampling circuitry for sampling the voltage sense signal during the excitation waveform at a specified sampling rate that corresponds to the excitation frequency;

    circuitry for demodulating and filtering the voltage sense signal samples into a ventilation band to thereby generate a ventilation signal;

    circuitry for deriving a signal proportional to minute ventilation from the ventilation signal;

    circuitry for detecting noise when no excitation current is supplied and for computing an average noise level; and

    , circuitry for selecting a configuration of voltage sense electrodes for use by the device that result in the lowest average noise level.

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