Study on the Blood Gas Sensor Based on Optical Absorption Technology

摘要

Continuous intra-arterial blood gas monitoring is used clinically in hospital and intensive care unit settings.The blood gas can be detected by the colormetric indicators which are sealed in the silicone membrane.The glass tubing of the sensor should be as thin as possible since it affects response time and the bicarbonate buffer shifts the sensitivity of the sensor. In this paper,the sensitivity shifts by the bicarbonate buffer was researched.When carbon dioxide diffuses into the indicator, the carbon acid is produced and the bicarbonate buffer is used to control internal acidity.Because the sensitivity of the pCO_2 sensor is increased by controlling the concentration of the bicarbonate buffer,the bicarbonate buffer is used to obtain the optimum resolution in this investigation.Moreover,the different concentrations of the bicarbonate buffer for blood gas measurements are discussed in detail.