Validation of an Endoscopic Fibre-Optic Pressure Sensor for Noninvasive Measurement of Variceal Pressure

Figure 3

Experimental model of an esophageal varix for comparison of the endoscopic fibre-optic pressure sensor with direct measurement of artificial intravariceal pressure: a: esophageal model; b: artificial varices filled with water and connected to a water column; c: fibre-optic pressure sensor that was inserted through the working channel and compressed on the varix gently; d: polygraph. The pressure in the balloon () was recorded by polygraph of endoscopic fibre-optic pressure sensor. The pressure in the artificial varix () was measured using the height of the water column ().