Medical devices for respiratory dysfunction : principles and by Ahmed M. Al-Jumaily

By Ahmed M. Al-Jumaily

The first goal of this ebook is to provide contemporary learn and improvement on non-stop optimistic Airway strain (CPAP) units with specific specialize in their use for the remedy of the main established breathing problems: Obstructive Sleep Apnea (OSA) and breathing misery Syndrome (RDS). The ebook introduces the reader to the elemental rules of operation, improvement and modeling as well as up-to-date literature surveys of breathing help units with an emphasis on OSA and RDS. The ebook displays greater than 10 years of analysis and improvement on utilizing electromechanical engineering ideas to enhance scientific results within the scientific group. The publication comprises an introductory bankruptcy on modeling recommendations plus components. half 1 contains 5 chapters which specialise in OSA units. the 1st bankruptcy covers simple ideas of operation, performance and an up to date literature survey on improvement, modeling and the advance of appropriate OSA therapy units. the remainder 4 chapters concentrate on CPAP fluid dynamics, humidification, computerized keep an eye on and masks layout. half 2 specializes in using the Bubble CPAP approach to regard RDS. the 1st bankruptcy covers simple ideas of operation, performance and an up to date literature survey on those units. the remainder chapters concentrate on the modeling and improvement of Bubble CPAP units and modeling of the neonatal respiration process. Bioengineering researchers and engineers excited by the sector of designing scientific units, in addition to practitioners and scholars, will locate this publication a important compilation that familiarizes the reader with useful modeling methods to reinforce the layout method. This ebook may have frequent use in undergraduate and graduate modeling classes

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Extra resources for Medical devices for respiratory dysfunction : principles and modeling of continuous positive airway pressure (CPAP)

Sample text

0 ºC Modeling of Continuous Positive Airway Pressure respiration 49 BREATHING atmospheric ATMOSPHERE COMPRESSOR set pressure CONTROLLER stroke + COMPRESSOR + disc. flow reservoir + SUPPLY LINE + + + mask pressure SUPPLY LINE Figure 3-19. Block diagram of the system Table 3-2 gives the system constants (including thermophysical parameters) that are used to simulate the overall model. A block diagram is developed in Figure 3-19 and a Simulink™ model is developed in Figure 3-20. It is to be noted that the mask pressure is the controlled variable, which has to be maintained within specified limits.

It can be seen from Figure 3-21 that the compressor speed has to be maintained around 300 Hz in order to maintain the mask pressure within the specified limits. Compressor speed below this level causes the stroke to reach its upper saturation value of 12 mm (Figure 3-22). In the first half of the breath cycle (Figure 3-5), due to inhalation, there is a depletion of air resulting in a drop in the mask pressure. Figure 3-22.

05 kPa. The compressor that will be utilized in the system is a high speed, variable stroke reciprocating compressor with a single acting piston. It is believed that the compressor stroke can be changed from 0 to 12 mm on a per stroke basis, and reciprocates at around 200 cycles/s. The controller should thus be capable of controlling the piston stroke in each cycle, to maintain the desired pressure level in the mask with the specified limits. 1 Compressor Analysis The compressor is a reciprocating type single acting machine with a variable stroke.

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