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Comprehensive Measurement Techniques for Respiratory System in Biomedical Engineering

This chapter presents in-depth methodologies for measuring the respiratory system's functionality, focusing on key aspects such as pulmonary function tests (PFTs), gas transport including O2 uptake and CO2 removal, and the maintenance of homeostasis. It discusses the architecture of respiratory monitoring, ventilatory mechanics, and various pressure measurement techniques, including differential pressure transducers and balloon sensors. The chapter also highlights advanced gas measurement technologies like gas chromatography and mass spectrometry to assess gas concentrations and diffusion, crucial for effective patient monitoring and care.

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Comprehensive Measurement Techniques for Respiratory System in Biomedical Engineering

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  1. MEDICAL INSTRUMENTATION II CHAPTER 9. MEASUREMENTS OF THE RESPIRATORY SYSTEM BIOMEDICAL ENGINEERING 2006200401 TAE_EUI, KIM

  2. Respiratory Observation PFT (Pulmonary Functional Tests) - Patient monitoring -

  3. Architecture

  4. Physiological Function • O2 Transport into blood stream • CO2 removal from blood stream • Homeostasis of PO2, PCO2

  5. Equivalent Model Respiration – Ventilatory mechanics => RC equivalent model - Gas transport => Mass balance equivalent ( Diffusion process )

  6. Pressure Measurement- Differential Pressure Transducer Diaphragm P1 P2 Diaphragm Strain gage

  7. Pressure Measurement- Balloon Sensor +5V Metal Switch Vi Hole Pressure Sensor Pressure Control Gas • A switch should not be stable state • Should be attached and detached • so that able to measure change of external Pressure P.

  8. Pressure Measurement- Balloon Sensor

  9. Pressure Measurement- N2 Washout Technique • - Patient at FRC • Prepare spirometer with O2, Vsp • Patient breath to the spirometer • Measure into concentration into the expirotory gas

  10. Gas Concentration Measurement Mass spectroscophy Gas chromatography Infrared spectroscophy Ramen spectroscophy Emission spectroscophy Paramagnetic O2 Analyzer

  11. Gas Transport Measurement- Gas distribution Test

  12. Gas Transport Measurement- Diffusion Test CO Diffusion Capacity The more FCO reduce compared to FHe, the more diffusion.

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