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英国伦敦医科大学研究人员设计了一种在体内能同时和连续测量氧分压和二氧化碳分压的导管末端装置,这种装置已广泛应用于临床。电极安置于40厘米聚氯乙稀导管的末端,导管末端为5F(注:5French=1.65毫米)。银阴极由一种环氧树脂环状物包裹,使与通用电极绝掾。它由下列部分组成:测量pH变化从而获知二氧化碳分压值的导管末端的pH传感玻璃球;测量氧分压用的180微米直径的银阴极;用于通用参考电极的银/银氯化物电极;通用于氧分压和二氧化碳分压电极的半固态电解液和应用浸溃涂复技术的通用气体半渗透弥散膜。当装置安置于血液或盐溶液时,水通过膜蒸发弥散,并用甲醛钠和氯化钠晶体涂复水凝胶薄膜,构成二氧化碳分压电极通常用的电解液。据此,从氧分压和二氧化碳分压二个电极上获得输出信号。水合过程的时候,对于电极稳定所需时间是40分钟。这种导
Researchers at the London Medical University in the UK have devised a catheter tip device that measures oxygen partial pressure and carbon dioxide partial pressure simultaneously and continuously in the body. This device has been widely used clinically. The electrode was placed on the end of a 40 cm polyvinyl chloride catheter and the end of the catheter was 5F (Note: 5 French = 1.65 mm). The silver cathode is surrounded by an epoxy ring that renders it compatible with universal electrodes. It consists of a pH sensing glass bulb at the end of a catheter that measures the change in pH to give a partial pressure of carbon dioxide; a 180 micron diameter silver cathode for oxygen partial pressure; a silver / silver chloride electrode for a universal reference electrode ; Semi-solid electrolyte common to oxygen partial pressure and carbon dioxide partial pressure electrodes, and universal gas semi-permeable diffusion membrane using dip coating technology. When the device is placed in blood or saline solution, water is dispersed through the membrane and the hydrogel film is coated with sodium formaldehyde and sodium chloride crystals to form the electrolyte normally used for the carbon dioxide partial pressure electrode. Accordingly, the output signal is obtained from the two electrodes of the partial pressure of oxygen and the partial pressure of carbon dioxide. The time required for the electrode to stabilize is 40 minutes during the hydration process. This guide