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Three-wavelength oxygen saturation measuring apparatus in the oxygen content of arterial blood, is to determine whether the human respiratory and circulatory system an important indicator of hypoxia. Oxygen saturation monitoring in clinical anesthesia ﹑ newborn and critically ill patients for medical care applications provide direct, fast ﹑ effective clinical basis for new blood vessels in the brain surgical, surgical and neonatal care and other fields ﹑ premature children has important significance.