City University London, School of Engineering and Mathematical Sciences, Northampton Square, London, EC1V 0HB, United Kingdom.
J Biomed Opt. 2011 Jul;16(7):077005. doi: 10.1117/1.3598858.
A prototype fiber-optic reflectance-mode pulse oximetry sensor and measurement system is developed for the purposes of estimating arterial oxygen saturation in the esophagus. A dedicated probe containing miniature right-angled glass prisms coupled to light sources and a photodetector by means of optical fibers is designed and used to record photoplethysmographic (PPG) signals from the esophageal epithelium in anesthetized patients. The probe is inserted simply by an anesthesiologist in all cases, and signals are recorded successfully in all but one of 20 subjects, demonstrating that esophageal PPG signals can be reliably obtained. The mean value of the oxygen saturation recorded from the esophagus for all subjects is 94.0 ± 4.0%. These results demonstrate that SpO(2) may be estimated in the esophagus using a fiber-optic probe.
一种用于估算食管动脉血氧饱和度的光纤反射模式脉冲血氧计传感器和测量系统已经开发出来。设计并使用一种专用探头，其中包含微型直角玻璃棱镜，通过光纤与光源和光电探测器相连，以记录麻醉患者食管上皮的光体积描记图（PPG）信号。在所有情况下，探头都由麻醉师简单插入，在 20 名受试者中，除了 1 名外，其余所有受试者均成功记录到信号，这表明可以可靠地获得食管 PPG 信号。所有受试者的食管血氧饱和度记录平均值为 94.0 ± 4.0%。这些结果表明，使用光纤探头可以估计食管中的 SpO2。
