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Medical Devices for Respiratory Dysfunction: Principles and Modeling of Continuous Positive Airway Pressure (CPAP)

Ahmed M. Al-Jumaily
Ahmed M. Al-Jumaily
Institute of Biomedical Technologies,
Auckland University of Technology
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ASME Press
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Modeling of the humidification process in a typical Continuous Positive Airway Pressure (CPAP) device is described in this chapter, by developing a model that predicts the mask absolute humidity level and air temperature due to the physical, mechanical, and thermodynamic behavior of individual elements. Such a model is formulated by incorporating the relationship between the inputs and measurable outputs in terms of air conditions at the mask. The system model inputs include machine settings and sensor readings.

Modeling a system in this fashion is shown to accurately predict the behavior of a typical system humidifier, heated air delivery tube, flexible...

4.1 The Need for Humidification
4.2 Types of Humidifiers
4.2.1 Heated Humidifiers
4.2.2 Passive Humidifiers
4.2.3 Hygroscopic Condenser Humidifiers
4.3 Modeling with Humidification
4.4 Air Delivery Unit
4.5 Humidification Process
4.6 Mass Transfer
4.7 Humidifier Heat Transfer
4.7.1 Heater Plate
4.7.2 Water Reservoir
4.7.3 Air Chamber
4.8 Heated Air Delivery Tube (HADT)
4.9 Interface
4.9.1 Flexible Tube
4.9.2 Nasal Mask
4.10 Simulink™ Model
4.11 Closure
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