| Summary: | 碩士 === 逢甲大學 === 自動控制工程所 === 93 === Nowadays, the respirators used clinically only provide several fixed airflow waveform as the ventilation mode. It goes without saying that the respirators can’t provide the changing airflow waveform that the human body needs, and modify with the respiratory physiological changes or energy demands of patients. This research combines several previous researches, and the experiment framework includes the Human Respiratory Control Simulator (optimal controller, neural network controller), ventilation device, artificial lung, and Analysis Plus!™, which is the interface software used to measure and get the respiratory signals after the artificial lung ventilates. The acquisition card (PCI-6024E) made by National Instrument is mainly taken as the interface to control and drive the self-made ventilation device with the mimic optimized airflow profiles.
The previously designed active-mode ventilation device has performed the active control of the whole cycle as well as the optimal breathing airflow waveform effectively, but, the inspiratory control program can’t match the mechanical performance of proportional solenoid valve and the limitation of mechanical characters of proportional solenoid valve during expiratory cycle. Thus, the optimal breathing patterns are not carried out yet. The focal point of this research is to solve the problem caused by the previously designed ventilation device, modify the system error of the “active-mode ventilation device”, and carry out the optimal breathing patterns imitated by the Human Respiratory Control Simulator. The ventilation experiment is divided into three experiments, which are under the variation of respiratory mechanics, under the excise state, and when inhaling cabon dioxide. The experiment result shows that the error of airflow and inspiratory time are improved the best, and then is the volume error, and then is the limited improvement of pressure error; while the error of expiratory time is enlarged when inhaled carbon dioxide pressure and carbon dioxide metabolic rate increase.
Respirators play an important role in modern medical equipment. We carry out the ventilation airflow waveform, which is including Square Shape, Sine Shape, and Ramp Shape and used by NPB7200 respirator clinically, tidal volume, peak flow, as well as the function setting of respiratory rate by the self-developed ventilation device. The completion and examination of the improved ventilation device could not only better the human respiratory control simulation system, but also increase the clinic application value of this series of researches.
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