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Measuring human ventilation for apnoea detection using an optical encoder

G M Weinberg1, J G Webster

  • 1Department of Electrical and Computer Engineering, University of Wisconsin-Madison, 53706, USA.

Physiological Measurement
|September 15, 1998
PubMed
Summary
This summary is machine-generated.

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We developed an optical encoder system to measure ventilation by tracking chest circumference changes. This technology offers potential for infant apnea monitoring and long-term adult respiratory assessment.

Area of Science:

  • Biomedical Engineering
  • Respiratory Monitoring Technology

Background:

  • Accurate measurement of ventilation is crucial for patient monitoring, especially in infants and adults.
  • Existing methods for respiratory monitoring can be invasive or limited in long-term application.

Purpose of the Study:

  • To design, build, and test a proof-of-concept system for measuring adult and infant ventilation using optical encoder technology.
  • To assess the feasibility of using changes in chest circumference as an indirect indicator of respiratory function.

Main Methods:

  • A system utilizing a Hewlett-Packard HEDS-9720 optical encoder mounted on a nylon web belt was developed.
  • The encoder measures displacement of a codestrip, correlating to changes in torso circumference during respiration.
  • Dual sensor bands on the chest and abdomen were explored for potential obstructive apnea detection.

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Main Results:

  • The optical encoder system demonstrated a resolution of 0.17 mm and accuracy of 0.008 mm over a 10 mm test distance.
  • The system successfully converted chest circumference motion into directional movement (inhalation/exhalation) and magnitude of change.
  • The potential for detecting obstructive apnea using dual sensor bands was identified.

Conclusions:

  • Optical encoder technology provides a viable method for indirectly measuring ventilation through chest circumference changes.
  • This system shows promise for non-invasive infant apnea monitoring and long-term adult respiratory surveillance.
  • Further development could enhance its utility in clinical respiratory diagnostics.