Abstract: The present device, generates external force tending to open the O-ring formed by the thumb and another finger of the examiner and composed of a pair of artificial finger sections including two artificial fingers 8A and 8B. The artificial fingers 8A and 8B include two slender tubes 12 and 14 having corrugated wall faces, core members 16 for maintaining the parallel arrangement of the tubes 12 and 14, and thin bag-like covering members 18 consisting of a high polymer for covering the outer periphery of the tubes 12 and 14. Pump sections 10 for controlling movement of low viscosity hydraulic oil serving as a fluid sealed in fluid chambers 12a and 14a are integrally connected to base ends of the artificial fingers 8A and 8B.

Abstract: In the present device, means for generating external force tending to open the O-ring formed by the thumb and another finger of the examinee is composed of a pair of artificial finger sections including two artificial fingers 8A and 8B. The artificial fingers 8A and 8B include two slender tubes 12 and 14 having corrugated wall faces, core members 16 for maintaining the parallel arrangement of the tubes 12 and 14, and thin bag-like covering members 18 consisting of a high polymer for covering the outer periphery of the tubes 12 and 14. Pump sections 10 for controlling movement of low viscosity hydraulic oil serving as a fluid sealed in fluid chambers 12a and 14a are integrally connected to base ends of the artificial fingers 8A and 8B.