MEDICAL INSTRUMENTATION II MEASUREMENTS OF THE RESPIRATORY SYSTEM

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Presentation transcript:

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

Respiratory Observation PFT (Pulmonary Functional Tests) - Patient monitoring

Architecture

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

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

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

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

Pressure Measurement - Balloon Sensor

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

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

Gas Transport Measurement - Gas distribution Test

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

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