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A silicon bidirectional flow sensor for measuring respiratory flow

M J van Putten1, M H van Putten, A F van Putten

  • 1Department of Neurology, Academic Hospital Leiden, The Netherlands. putten@rullf2.medfac.leidenuniv.nl

IEEE Transactions on Bio-Medical Engineering
|February 1, 1997
PubMed
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A novel silicon integrated, bidirectional flow sensor accurately measures respiratory airflow for mechanical ventilation. This thermal vector sensor demonstrates rapid response times and minimal sensitivity to gas composition changes.

Area of Science:

  • Biomedical Engineering
  • Sensor Technology
  • Respiratory Monitoring

Background:

  • Accurate respiratory flow monitoring is crucial for mechanical ventilation.
  • Existing sensors may have limitations in bidirectional measurement or response time.

Purpose of the Study:

  • To introduce a novel solid-state, silicon integrated, bidirectional flow sensor.
  • To evaluate its performance in respiratory applications, specifically mechanical ventilation.

Main Methods:

  • Development of a thermal vector sensor with integrated electronic circuitry.
  • Testing the sensor's bidirectional sensitivity and response times.
  • Assessment of the sensor's performance with a healthy volunteer on mechanical ventilation.

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Main Results:

  • The bidirectional flow sensor operates effectively within a range of -60 to +60 L/min.
  • Achieved rapid rise-time (< 40 ms) and fall-time (< 60 ms).
  • Demonstrated minimal signal deviation (< 2%) due to gas composition changes and low temperature sensitivity (-1.5%/°C).

Conclusions:

  • The developed silicon integrated sensor offers a promising solution for bidirectional respiratory flow measurement.
  • Its performance characteristics are suitable for mechanical ventilation applications.
  • The sensor exhibits robustness against common environmental and physiological variations.