![]() ![]() In summary, the EOW concept describes physiology of decompression after saturation with nitrogen-based breathing mixtures. Using the concept of the EOW, 76 man-decompressions were conducted after air and nitrox saturations in depth range between 18 and 45 meters with no single case of DCS. Clear dose-reaction relation exists, and this confirms that any supersaturation over the EOW creates a risk for DCS. The model has been theoretically verified through its application for estimation of risk of decompression sickness in published systems of air and nitrox saturation decompressions, where DCS cases were observed. Then, keeping a driving force for long decompression not exceeding the EOW allows optimal elimination of nitrogen from the limiting compartment with half-time of 360 min. Initially, ambient pressure can be reduced at a higher rate allowing the elimination of inert gas from faster compartments using the EOW concept, and maximum outflow of nitrogen. ![]() EOW mainly depends on the physiology of the metabolic oxygen window-also called inherent unsaturation or partial pressure vacancy-but also on metabolism of carbon dioxide, the existence of water vapor, as well as tissue tension. In Poland, the system for programming of continuous decompression after saturation with compressed air and nitrox has been developed as based on the concept of the Extended Oxygen Window (EOW). Most operational procedures rely on experimentally found parameters describing a continuous slow decompression rate. It is a delicate and long lasting process during which single milliliters of inert gas are eliminated every minute, and any disturbance can lead to the creation of gas bubbles leading to decompression sickness (DCS). It is defined by the borderline condition for time spent at a particular depth (pressure) and inert gas in the breathing mixture (nitrogen, helium). (in Chinese).Saturation decompression is a physiological process of transition from one steady state, full saturation with inert gas at pressure, to another one: standard conditions at surface. Journal of Xiamen University ( Natural Science) 50(5): 847–851. Dynamic performance simulation of pressure relief valve and test. Journal of Rocket Propulsion 40 (1): 60–64. Dynamic modeling and simulation for converse unloading pressure reducing valve. Journal of National University of Defense Technology 31 (2): 1–4. Research of the vibration failure of the large flux PRV. Dynamic simulation of balanced pneumatic pressure reducing valve. Yuanshen, Zhang, Zhang Chun, Lu Xiao, Liu Binbin, Shen Huan, and Wang Shuwu. Journal of Rocket Propulsion 34 (2): 18–23. Analysis on responding characteristics of large flux pressure reducing valve. Li, Zheng, Li Qinglian, and Shen Chibing. Stability analysis of reducing valve for oxygen breathing apparatus. Petrochemical Industry Technology 16 (3): 22–23. The analysis and solution for the adjustment failed of oxygen regulator. Simulation and analysis of reverse-type pressure regulator. Xiao, Yu., Bing Sun, Guiping Li, and Zhongjun Yu. Nanjing University of Aeronautics and Astronautics. Strength analysis of oxygen decompressor based on the finite element method. ![]() Journal of Beijing University of Aeronautics and Astronautics 11: 1379–1383. Zhao jingquan: Simulation on pressure regulator characteristic. ![]()
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