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Minute ventilation sensor with dynamically adjusted excitation current

  • US 20040049237A1
  • Filed: 07/12/2002
  • Published: 03/11/2004
  • Est. Priority Date: 07/12/2002
  • 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 between the excitation current electrodes as a bipolar excitation current waveform at a specified excitation frequency and amplitude, wherein the excitation current waveform is output as a strobe made up of a specified number of excitation current waveform cycles with each strobe repeated at a specified strobing frequency;

    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 strobe at a specified sampling rate that corresponds to the excitation frequency;

    circuitry for initiating a noise detection operation wherein the voltage sense signal is sampled when no excitation current is supplied and the samples are then processed to detect a noise level; and

    , circuitry for adjusting the excitation current in accordance with the detected noise level.

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